DCM™ DC-DC Converter
DCM3623x50M53C2yzz
®
C
S
US
C
NRTL
US
Isolated, Regulated DC Converter
Features & Benefits
Product Ratings
• Isolated, regulated DC-DC converter
• Up to 320W, 6.67A continuous
• 92.6% peak efficiency
•
823W/in3
VIN = 16 – 50V
POUT = 320W
VOUT = 48.0V
(28.8 – 52.8V Trim)
IOUT = 6.67A
Power density
• Wide input range 16 – 50VDC
Product Description
• Safety Extra Low Voltage (SELV) 48.0V Nominal Output
The DCM Isolated, Regulated DC Converter is a DC-DC converter,
operating from an unregulated, wide‑range input to generate an
isolated 48.0VDC output. With its high‑frequency zero‑voltage
switching (ZVS) topology, the DCM converter consistently
delivers high efficiency across the input line range. Modular DCM
converters and downstream DC-DC products support efficient
power distribution, providing superior power system performance
and connectivity from a variety of unregulated power sources to
the point-of-load.
• 2250VDC isolation
• ZVS high-frequency switching
Enables low-profile, high-density filtering
• Optimized for array operation
Up to 8 units – 2560W
No power de-rating needed
Sharing strategy permits dissimilar line voltages
across an array
• Fully operational current limit
• OV, OC, UV, short circuit and thermal shut down
• Military standard compliance:
MIL-STD-810G
Leveraging the thermal and density benefits of Vicor ChiP™
packaging technology, the DCM module offers flexible thermal
management options with very low top and bottom side thermal
impedances. Thermally-adept ChiP-based power components
enable customers to achieve cost effective power system solutions
with previously unattainable system size, weight and efficiency
attributes, quickly and predictably.
MIL-STD-202G
Package Information
MIL-STD-704E/F
(DC power characteristics only)
• Through-hole ChiP package
MIL-STD-461E/F/G
(Please contact Vicor Applications Engineering)
1.524 x 0.898 x 0.284in
[38.72 x 22.80 x 7.21mm]
MIL-STD-1275E
(Applicable only for 16 – 50VIN range designs;
please contact Vicor Applications Engineering)
Weight: 24.0g
[0.85oz]
Typical Applications
• Industrial
• Process Control
• Transportation / Heavy Equipment
• Defense / Aerospace
Note: Product images may not highlight current product markings.
DCM™ DC-DC Converter
Page 1 of 28
Rev 1.7
03/2022
DCM3623x50M53C2yzz
Typical Applications
DCM1
TR
EN
EMI_GND
L1_1
F1_1
CY
+IN
VIN
C1_1
Lb_1
Rdm_1
FT
CY
L2_1
+OUT
Rd_1
RCOUT-EXT_1
Cd_1
COUT-EXT_1
–IN
–OUT
C2_1
C3
C4
Load
CY
CY
DCM2
TR
EN
L1_2
F1_2
CY
+IN
C1_2
Lb_2
Rdm_2
FT
CY
L2_2
+OUT
Rd_2
RCOUT-EXT_2
Cd_2
COUT-EXT_2
–IN
–OUT
CY
CY
≈≈
C2_2
≈≈
DCM4
TR
EN
L1_4
F1_4
CY
+IN
C1_4
Lb_4
Rdm_4
FT
CY
L2_4
+OUT
RCOUT-EXT_4
Rd_4
Cd_4
–IN
C2_4
COUT-EXT_4
–OUT
CY
CY
Typical application 1: DCM3623x50M53C2yzz in an array of four units
DCM
TR
EMI_GND
EN
FT
F1
CY
L1
VIN
CY
+IN
C1
Rdm
+OUT
Rd
RCOUT-EXT
Cd
COUT-EXT
–IN
–OUT
CY
Load 1
Lb
L2
CY
C2
Non-isolated
Point-of-Load
Regulator
Load 2
Typical application 2: single DCM3623x50M53C2yzz, to a non-isolated regulator, and direct to load
DCM™ DC-DC Converter
Page 2 of 28
Rev 1.7
03/2022
DCM3623x50M53C2yzz
Typical Applications (Cont.)
DCM1
TR
EMI_GND
EN
FT
F1_1
CY
CY
T1_1
VIN
C1_1
+IN
+OUT
–IN
–OUT
CY
Lb_1
L2_1
RCOUT-EXT_1
Rd_1
Cd_1
Rdm_1
C2_1
COUT-EXT_1
C3
C4
Load
CY
DCM2
TR
EN
FT
F1_2
CY
T1_2
C1_2
CY
+IN
+OUT
–IN
–OUT
CY
Lb_2
L2_2
RCOUT-EXT_2
Rd_2
Cd_2
Rdm_2
C2_2
COUT-EXT_2
CY
≈≈
≈≈
DCM8
TR
EN
FT
F1_8
CY
T1_8
CY
+IN
C1_8
+OUT
Lb_8
Rdm_8
L2_8
Rd_8
RCOUT-EXT_8
Cd_8
COUT-EXT_8
–IN
CY
C2_8
–OUT
CY
Typical application 3: parallel operation of DCMs with common-mode chokes installed on the input side to suppress common-mode noise
DCM™ DC-DC Converter
Page 3 of 28
Rev 1.7
03/2022
DCM3623x50M53C2yzz
Pin Configuration
TOP VIEW
1
2
+IN A
A’ +OUT
B’ –OUT
TR B
EN C
C’ +OUT
FT D
–IN E
D’ –OUT
DCM ChiP™
Pin Descriptions
Pin Number
Signal Name
Type
Function
A1
+IN
INPUT POWER
B1
TR
INPUT
Enables and disables trim functionality; adjusts output voltage when trim active
C1
EN
INPUT
Enables and disables power supply
D1
FT
OUTPUT
E1
–IN
INPUT POWER
RETURN
Negative input power terminal
A’2, C’2
+OUT
OUTPUT POWER
Positive output power terminal
B’2, D’2
–OUT
OUTPUT POWER
RETURN
Negative output power terminal
DCM™ DC-DC Converter
Page 4 of 28
Positive input power terminal
Fault monitoring
Rev 1.7
03/2022
DCM3623x50M53C2yzz
Part Ordering Information
Part Number
Temperature Grade
DCM3623T50M53C2C00
C = –20 to 125°C
DCM3623T50M53C2T00
T = –40 to 125°C
DCM3623T50M53C2M00
M = –55 to 125°C
Option
Tray Size
00 = Analog Control
Interface Version
24 parts per tray
Previous Part Number
MDCM28AP480M320A50, DCM28AP480T320A50
Storage and Handling Information
Note: For compressive loading refer to Application Note AN:036, “Recommendations for Maximum Compressive Force of Heat Sinks.”
For handling and assembly processing refer to Application Note AN:301, “Through-Hole ChiP™ Package Soldering Guidelines.”
Parameter
Comments
Storage Temperature Range
Operating Internal Temperature Range (TINT)
Peak Temperature Top Case
(Soldering) [a]
Specification
C-Grade
–20 to 125°C
T-Grade
–40 to 125°C
M-Grade
–65 to 125°C
C-Grade
–20 to 125°C
T-Grade
–40 to 125°C
M-Grade
–55 to 125°C
For further information, please contact factory applications
135°C
Nickel
Lead Finish
0.51 – 2.03µm
Palladium
0.02 – 0.15µm
Gold
0.003 – 0.051µm
Weight
24.0g [0.85oz]
MSL Rating
Not applicable to through-hole ChiP products
Method per Human Body Model (HBM) Test ESDA / JEDEC JDS-001-2012
ESD Rating
[a]
N/A
Class 1C
Charged Device Model (CDM) JESD22-C101E
Class 2
Product is not intended for reflow solder attach.
Safety, Reliability and Agency Approvals
Parameter
Comments
Min
Typ
Max
Unit
IN to OUT
2250
VDC
IN to CASE
2250
VDC
OUT to CASE
707
VDC
Insulation Resistance
IN to OUT, IN to CASE, OUT to CASE at 500VDC, 1 minute
10
MΩ
MTBF
MIL-HDBK-217 FN2 Parts Count 25°C Ground Benign, Stationary,
Indoors / Computer
3.39
Telcordia Issue 2, Method I Case 3, 25°C, 100% D.C., GB, GC
5.68
Dielectric Withstand Test
cURus, UL 60950-1
Agency Approvals/Standards
cTÜVus, EN 62368-1
UKCA, electrical equipment (safety) regulations
CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable
DCM™ DC-DC Converter
Page 5 of 28
Rev 1.7
03/2022
MHrs
DCM3623x50M53C2yzz
Absolute Maximum Ratings
The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to the device.
Electrical specifications do not apply when operating beyond rated operating conditions.
Parameter
Comments
Min
Max
-0.5
65.0
V
-1
1
V/µs
TR to –IN
-0.3
3.5
V
EN to –IN
-0.3
3.5
V
-0.3
3.5
V
5
mA
-0.5
62.4
V
Input Voltage (+IN to –IN)
Input Voltage Slew Rate
FT to –IN
Output Voltage (+OUT to –OUT)
Dielectric Withstand (Input to Output)
2250
Basic insulation
Average Output Current
DCM™ DC-DC Converter
Page 6 of 28
VDC
10.3
Rev 1.7
03/2022
Unit
A
DCM3623x50M53C2yzz
Electrical Specifications
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of –20°C < TINT < 125°C for C-Grade, –40°C < TINT < 125°C for T-Grade and –55°C < TINT < 125°C for M-Grade.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
16
28
50
V
25.0
A
Power Input Specifications
Input Voltage Range
VIN
Continuous operation
Inrush Current (Peak)
IINRP
With maximum COUT-EXT, full resistive load
Input Capacitance (Internal)
CIN-INT
Effective value at nominal input voltage
29.7
Input Capacitance (Internal) ESR
RCIN-INT
At 1MHz
0.73
Input Inductance (External)
LIN
µF
mΩ
1
Differential mode, with no further line bypassing
µH
No-Load Specifications
Nominal line, see Figure 3; C-Grade
Input Power – Disabled
PQ
0.5
1.2
Worst case line, see Figure 3; C-Grade
Nominal line, see Figure 3; T- and M-Grades
0.4
Input Power – Enabled with No Load
PNL
DCM™ DC-DC Converter
Page 7 of 28
9.3
Nominal line, see Figure 4; T- and M-Grades
Rev 1.7
03/2022
16.6
16.8
Worst case line, see Figure 4; C-Grade
Worst case line, see Figure 4; T- and M-Grades
0.8
W
1.0
Worst case line, see Figure 3; T- and M-Grades
Nominal line, see Figure 4; C-Grade
1.0
7.7
13.8
14.0
W
W
DCM3623x50M53C2yzz
Electrical Specifications (Cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of –20°C < TINT < 125°C for C-Grade, –40°C < TINT < 125°C for T-Grade and –55°C < TINT < 125°C for M-Grade.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
VOUT-NOM
VIN = 28V, nominal trim, at 100% load, TINT = 25°C
47.75
48.0
48.24
V
VOUT-TRIMMING
Trim range over temp at full load.
Specifies the low, nominal and high trim conditions.
28.8
48.0
52.8
V
2.1487
2.5262
2.9333
Power Output Specifications
Output Voltage Set Point
Rated Output Voltage Trim Range
Output Voltage Load Regulation
Output Voltage Light Load Regulation
Output Voltage
Temperature Coefficient
Output Voltage Accuracy
ΔVOUT-LOAD
ΔVOUT-LL
ΔVOUT-TEMP
%VOUT-ACCURACY
Linear load line. Output voltage increase from
full rated load current to no load (does not include
light-load regulation).
See Figure 6 and Design Guidelines section; C-Grade
Linear load line. Output voltage increase from
full rated load current to no load (does not include
light-load regulation).
See Figure 6 and Design Guidelines section; T- and
M-Grades
0 – 10% load, additional VOUT relative to
calculated load-line point.
See Figure 6 and Design Guidelines section.
Nominal, linear temperature coefficient,
relative to TINT = 25ºC.
See Figure 5 and Design Guidelines Section.
The total output voltage set-point accuracy from the
calculated ideal VOUT based on load, temp and trim.
Excludes ΔVOUT-LL; C-Grade
The total output voltage set-point accuracy from the
calculated ideal VOUT based on load, temp and trim.
Excludes ΔVOUT-LL; T- and M-Grades
V
2.2618
2.5262
0.00
2.7936
5.05
-6.40
-2.3
V
mV / ºC
2.3
%
-2.0
2.0
Rated Output Power
POUT
Continuous, VOUT ≥ 48.0V
320
W
Rated Output Current
IOUT
Continuous, VOUT ≤ 48.0V
6.67
A
Output Current Limit
IOUT-LIM
Of rated IOUT max. Fully operational current limit, for
nominal trim and below.
100
Current Limit Delay
tIOUT-LIM
The module will power limit in a fast transient event.
Full load, nominal line, nominal trim
Efficiency
Output Voltage Ripple
DCM™ DC-DC Converter
Page 8 of 28
η
VOUT-PP
Full load, over line and temperature, nominal trim;
C-Grade
50% load, over rated line, temperature and trim;
C-Grade
Full load, over line and temperature, nominal trim;
T- and M-Grades
50% load, over rated line, temperature and trim;
T- and M-Grades
20MHz bandwidth. At nominal trim,
minimum COUT-EXT and at least 10% rated load
Rev 1.7
03/2022
120
1
91.7
143
%
ms
92.6
89.8
85.4
%
91.6
87.1
1072
mV
Electrical Specifications (Cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of –20°C < TINT < 125°C for C-Grade, –40°C < TINT < 125°C for T-Grade and –55°C < TINT < 125°C for M-Grade.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Power Output Specifications (Cont.)
Output Capacitance (Internal)
COUT-INT
Effective value at nominal output voltage
Output Capacitance ESR (Internal)
RCOUT-INT
At 1MHz
COUT-EXT
For load transients that remain >10% rated load;
excludes component temperature coefficient
200
2000
µF
For load transients down to 0% rated load,
with static trim; excludes component
temperature coefficient
680
2000
µF
1700
2000
µF
Output Capacitance (External)
COUT-EXT-TRANS
For load transients down to 0% rated load,
COUT-EXT-TRANS-TRIM with dynamic trimming; excludes component
temperature coefficient
Output Capacitance ESR (External)
RCOUT-EXT
At 10kHz, excludes component tolerances
11
µF
0.222
mΩ
10
mΩ
tINIT
See state diagram
25
Output Turn-On Delay
tON
From rising edge EN, with VIN pre-applied;
see timing diagram
200
Output Turn-Off Delay
tOFF
From falling edge EN; see timing diagram
Soft-Start Ramp Time
tSS
At full rated resistive load.
Typical spec is 1-up with minimum COUT-EXT.
Max spec is for arrays with max COUT-EXT
Initialization Delay
Output Voltage Threshold
for Max Rated Load Current
VOUT-FL-THRESH
During start up, VOUT must achieve this
threshold before output can support
full rated current
Output Current at Start Up
IOUT-START
Max load current at start up while VOUT
is below VOUT-FL_THRESH
Monotonic Soft-Start
Threshold Voltage
Minimum Required
Disabled Duration
Minimum Required
Disabled Duration
for Predictable Restart
Voltage Deviation (Transient)
Settling Time
DCM™ DC-DC Converter
Page 9 of 28
120
40
ms
µs
600
µs
200
ms
24.0
V
0.66
A
VOUT-MONOTONIC
Output voltage rise becomes monotonic
with 25% of preload once it crosses VOUT-MONOTONIC
24.0
V
tOFF-MIN
This refers to the minimum time a module needs
to be in the disabled state before it will attempt to
start via EN
2
ms
tOFF-MONOTONIC
This refers to the minimum time a module needs to
be in the disabled state before it is guaranteed to
exhibit monotonic soft-start and have predictable
start‑up timing
100
ms
%VOUT-TRANS
tSETTLE
Minimum COUT_EXT (10 ↔ 90% load step),
excluding load line
Rev 1.7
03/2022
VIN-INIT
INITIALIZATION
SEQUENCE
EN = False
tOFF-MIN delay
NON LATCHED
FAULT
tOFF
ult
Fa oved
m
Re
Powertrain: Stopped
FT = True
tINIT delay
Powertrain: Stopped
FT = True
Powertrain: Stopped
FT = True
EN = True and
No Faults
tON delay
EN = False
tOFF delay
In
p
In ut O
pu V
tU L
VL O o
O r
VIN > VIN-UVLO+ and
not Over-temp
TR mode latched
STANDBY
or
O
VL LO
t O UV
u
t
p
In npu
I
EN = False
tOFF-MIN delay
SOFT START
VOUT Ramp Up
tss delay
Powertrain: Active
FT = Unknown
RUNNING
tSS Expiry
Ou
tpu
Regulates VOUT
Powertrain: Active
FT = False
tO
or
mp
r-te
P
Ove put UV
Out
REINITIALIZATION
SEQUENCE
tINIT delay
Powertrain: Stopped
FT = True
Fault Removed
Ov
e
Ou r-tem
tpu
p
t U or
VP
VP
tO
pu
ut
O
VP
NON LATCHED
FAULT
tFAULT
Powertrain: Stopped
FT = True
LATCHED
FAULT
EN = False
DCM™ DC-DC Converter
Rev 1.7
Page 12 of 28 03/2022
Powertrain: Stopped
FT = True
DCM™ DC-DC Converter
Rev 1.7
Page 13 of 28 03/2022
Output
Input
FT
ILOAD
FULL LOAD
IOUT
VOUT
VOUT-UVP
FULL LOAD
VOUT-NOM
TR
VTRIM-DIS-TH
EN
VIN
VIN-UVLO+/VIN-INIT
VIN-OVLO+/-
tINIT
tON
1
Input Power On
- Trim Inactive
tSS
2
3
Ramp to TR
Full Load Ignored
tOFF
tOFF-MIN
4
EN
Low
tSS
tON
5
EN
High
tOVLO
6
Input
OVLO
tSS
tUVLO
7
Input
UVLO
tSS
tUVLO
8
Input
returned
to zero
DCM3623x50M53C2yzz
Timing Diagrams
Module inputs are shown in blue; module outputs are shown in brown.
DCM™ DC-DC Converter
Rev 1.7
Page 14 of 28 03/2022
Output
Input
FT
ILOAD
IOUT
FULL LOAD
VOUT
VOUT-UVP
VOUT-NOM
FULL LOAD
TR
VTR = nom
VTRIM-EN-TH
EN
VIN
VIN-UVLO+/VIN-INIT
VIN-OVLO+/-
tINIT
tON
9
Input Power On
- Trim Active
tSS
VOUT-OVP
10
Vout
based on
VTR
tOFF
11
Load dump
and reverse
current
tINIT
tON
tSS
12
Vout OVP
(primary
sensed)
13
Latched
fault cleared
RLOAD
tIOUT-LIM
14
Current Limit
with Resistive
Load
tFAULT
15
Resistive
Load with
decresing R
tINIT
16
Overload induced
Output UVP
tON
tSS
DCM3623x50M53C2yzz
Timing Diagrams (Cont.)
Module inputs are shown in blue; module outputs are shown in brown.
DCM3623x50M53C2yzz
Typical Performance Characteristics
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
10
Power Dissipation (W)
Power Dissipation (W)
0.50
0.45
0.40
0.35
0.30
0.25
10
20
30
40
50
Input Voltage (V)
-40°C
25°C
6
4
2
0
60
50
Output Voltage (V)
50
40
30
20
40
20
0
20
40
60
Case Temperature (°C)
Min Trim
Low Trim
Nom Trim
High Trim
30
40
50
Input Voltage (V)
25°C
60
90°C
Figure 4 — No-load power dissipation vs. VIN, at nominal trim
60
60
20
-40°C
60
10
10
90°C
Figure 3 — Disabled power dissipation vs. VIN
Output Voltage (V)
8
80
40
30
20
10
100
Max Trim
0
1
2
Min Trim
Low Trim
3
4
Output Current (A)
5
Nom Trim
High Trim
6
Max Trim
Figure 5 — Ideal VOUT vs. case temperature, at full load
Figure 6 — Ideal VOUT vs. load current, at 25°C case
Figure 7 — 100 – 10% load transient response, VIN = 28V,
nominal trim, COUT_EXT = 200µF
Figure 8 — 10 – 100% load transient response, VIN = 28V,
nominal trim, COUT_EXT = 200µF
DCM™ DC-DC Converter
Rev 1.7
Page 15 of 28 03/2022
7
DCM3623x50M53C2yzz
Typical Performance Characteristics (Cont.)
93.25
93.00
92.75
92.50
92.25
92.00
91.75
91.50
91.25
93.0
92.5
Efficiency (%)
Efficiency (%)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
10
20
30
40
Input Voltage (V)
25°C
50
90.5
60
90°C
92.5
92.0
91.5
91.0
20
30
40
Input Voltage (V)
-40°C
25°C
20
30
40
Input Voltage (V)
25°C
50
90°C
Figure 10 — Full-load efficiency vs. VIN, at nominal trim
93.0
10
10
-40°C
Figure 9 — Full-load efficiency vs. VIN, at low trim
Efficiency (%)
91.5
91.0
-40°C
90.5
92.0
50
60
90°C
Figure 11 — Full-load efficiency vs. VIN, at high trim
DCM™ DC-DC Converter
Rev 1.7
Page 16 of 28 03/2022
60
DCM3623x50M53C2yzz
Typical Performance Characteristics (Cont.)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
35
Power Dissipation (W)
95
Efficiency (%)
90
85
80
75
70
1
2
3
4
Load Current (A)
16V Input
5
28V Input
6
20
15
10
7
0
50V Input
1
2
3
4
Load Current (A)
16V Input
Figure 12 — Efficiency vs. load at TCASE = -40°C, nominal trim
5
28V Input
6
7
50V Input
Figure 13 — Power dissipation vs. load at TCASE = -40ºC,
nominal trim
27.5
Power Dissipation (W)
95
90
Efficiency (%)
25
5
0
85
80
75
70
25.0
22.5
20.0
17.5
15.0
12.5
10.0
7.5
0
1
2
3
4
Load Current (A)
16V Input
5
28V Input
6
7
0
50V Input
1
2
3
4
Load Current (A)
16V Input
Figure 14 — Efficiency vs. load at TCASE = 25°C, nominal trim
5
28V Input
6
7
50V Input
Figure 15 — Power dissipation vs. load at TCASE = 25ºC,
nominal trim
95.0
30
Power Dissipation (W)
92.5
Efficiency (%)
30
90.0
87.5
85.0
82.5
80.0
77.5
75.0
25
20
15
10
5
0
1
2
16V Input
3
4
Load Current (A)
28V Input
5
6
7
0
50V Input
Figure 16 — Efficiency vs. load at TCASE = 90°C, nominal trim
1
2
16V Input
3
4
Load Current (A)
28V Input
5
6
50V Input
Figure 17 — Power dissipation vs. load at TCASE = 90ºC,
nominal trim
DCM™ DC-DC Converter
Rev 1.7
Page 17 of 28 03/2022
7
DCM3623x50M53C2yzz
Typical Performance Characteristics (Cont.)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
Switching Frequency (kHz)
Switching Frequency (kHz)
800
700
600
500
400
300
200
100
0
50
60
70
80
90
800
700
600
500
400
300
200
100
0
100
Load (%)
16V Input
28V Input
50
60
Low Trim
50V Input
Figure 18 — Nominal powertrain switching frequency vs. load,
at nominal trim
70
80
Load (%)
Nom Trim
90
100
High Trim
Figure 19 — Nominal powertrain switching frequency vs. load,
at nominal VIN
Input Capacitance (µF)
50
45
40
35
30
25
20
15
10
5
0
0
8
16
24
32
40
48
56
64
72
80
Input Voltage (V)
Figure 20 — Start up from EN, VIN = 28V, COUT_EXT = 2000µF,
RLOAD = 7.200Ω
Figure 21 — Effective internal input capacitance vs. applied voltage
Figure 22 — Output voltage ripple, VIN = 28V, VOUT = 48.0V,
COUT_EXT = 200µF, RLOAD = 7.200Ω
DCM™ DC-DC Converter
Rev 1.7
Page 18 of 28 03/2022
DCM3623x50M53C2yzz
Pin Functions
The DCM will latch trim behavior at application of VIN (once VIN
exceeds VIN-UVLO+), and persist in that same behavior until loss
of input voltage
+IN, –IN
n
At application of VIN, if TR is sampled at above VTRIM-DIS-TH, the
module will latch in a non-trim mode, and will ignore the TR
input for as long as VIN is present.
Input power pins. –IN is the reference for all control pins,
and therefore a Kelvin connection for the control signals is
recommended as close as possible to the pin on the package, to
reduce effects of voltage drop due to –IN currents.
n
At application of VIN, if TR is sampled at below VTRIM-EN-TH, the
TR will serve as an input to control the real‑time output voltage,
relative to full load, 25°C. It will persist in this behavior until VIN is
no longer present.
+OUT, –OUT
Output power pins.
If trim is active when the DCM is operating, the TR pin provides
dynamic trim control at a typical 30Hz of –3dB bandwidth over the
output voltage. TR also decreases the current limit threshold when
trimming above VOUT-NOM.
EN (Enable)
This pin enables and disables the DCM converter; when held
low the unit will be disabled. It is referenced to the –IN pin of
the converter. The EN pin has an internal pull-up to VCC through
a 10kΩ resistor.
FT (Fault)
n
Output enable: When EN is allowed to pull up above the enable
threshold, VENABLE-EN-TH, the module will be enabled. If leaving EN
floating, it is pulled up to VCC and the module will be enabled.
n
Output disable: EN may be pulled down externally below
VENABLE‑DIS‑TH in order to disable the module.
n
EN is an input only, it does not pull low in the event of a fault.
n
The EN pins of multiple units should be driven high concurrently
to permit the array to start in to maximum rated load. However,
the direct interconnection of multiple EN pins requires additional
considerations, as discussed in the section on Array Operation.
TR (Trim)
The TR pin is used to select the trim mode and to trim the output
voltage of the DCM converter. The TR pin has an internal pull-up to
VCC through a 10.0kΩ resistor.
The FT pin provides a Fault signal.
Any time the module is enabled and has not recognized a fault,
the FT pin is inactive. FT has an internal 499kΩ pull-up to VCC,
therefore a shunt resistor, RSHUNT, of approximately 50kΩ can be
used to ensure the LED is completely off when there is no fault, per
the diagram below.
Whenever the powertrain stops (due to a fault protection or
disabling the module by pulling EN low), the FT pin becomes active
and provides current to drive an external circuit.
When active, FT pin drives to VCC, with up to 4mA of external
loading. Module may be damaged from an overcurrent FT drive,
thus a resistor in series for current limiting is recommended.
The FT pin becomes active momentarily when the
module starts up.
During the output voltage soft-start ramp, the FT pin
output toggles.
Typical External Circuits for Signal Pins (TR, EN, FT)
DCM
VCC
10kΩ
10kΩ
Output Voltage
Reference, Current
Limit Reference and
Soft Start control
TR
Soft Start and
Fault Monitoring
EN
RTRIM
499kΩ
Fault
Monitoring
FT
RSERIES
SW
RSHUNT
Kelvin –IN connection
DCM™ DC-DC Converter
Rev 1.7
Page 19 of 28 03/2022
D
DCM3623x50M53C2yzz
Design Guidelines
Building Blocks and System Design
The DCM converter input accepts the full 16 – 50V range, and
it generates an isolated trimmable 48.0VDC output. Multiple
DCMs may be paralleled for higher power capacity via wireless
load sharing, even when they are operating off of different input
voltage supplies.
The DCM converter provides a regulated output voltage around
defined nominal load line and temperature coefficients. The load
line and temperature coefficients enable configuration of an array
of DCM converters which manage the output load with no share
bus among modules. Downstream regulators may be used to
provide tighter voltage regulation, if required.
The DCM3623x50M53C2yzz may be used in standalone
applications where the output power requirements are up to
320W. However, it is easily deployed as arrays of modules to
increase power handling capacity. Arrays of up to eight units have
been qualified for 2560W capacity. Application of DCM converters
in an array requires no de‑rating of the maximum available power
versus what is specified for a single module.
Note: For more information on operation of single DCM, refer
to “Single DCM as an Isolated, Regulated DC-DC Converter”
application note AN:029. For more information on designing a
power system using the DCMs, refer to the DCM Design Guide.
Soft Start
When the DCM starts, it will go through a soft start. The soft-start
routine ramps the output voltage by modulating the internal error
amplifier reference. This causes the output voltage to approximate
a piecewise linear ramp. The output ramp finishes when the
voltage reaches either the nominal output voltage, or the trimmed
output voltage in cases where trim mode is active.
During soft start, the maximum load current capability is reduced.
Until VOUT achieves at least VOUT-FL-THRESH, the output current must
be less than IOUT-START in order to guarantee start up. Note that
this is current available to the load, above that which is required to
charge the output capacitor.
Nominal Output Voltage Load Line
Throughout this document, the programmed output voltage,
(either the specified nominal output voltage if trim is inactive or
the trimmed output voltage if trim is active), is specified at full
load and at room temperature. The actual output voltage of the
DCM is given by the programmed trimmed output voltage, with
modification based on load and temperature. The nominal output
voltage is 48.0V, and the actual output voltage will match this at
full load and room temperature with trim inactive.
For a given programmed output voltage, the actual output voltage
versus load current at nominal trim and room temperature is given
by the following equation:
VOUT at 25ºC = 48.0 + 2.5262 • (1 – IOUT / 6.67)
(1)
Nominal Output Voltage Temperature Coefficient
A second additive term to the programmed output voltage is based
on the temperature of the module. This term permits improved
thermal balancing among modules in an array, especially when
the factory nominal trim point is utilized (trim mode inactive).
This term is much smaller than the load line described above,
representing only a -6.40mV / °C change. Regulation coefficient is
relative to 25°C.
For nominal trim and full load, the output voltage relates to the
temperature according to the following equation:
VOUT-FL = 48.0 -6.400 • 0.001 • (TINT – 25)
(2)
Where TINT is in ºC
The impact of temperature coefficient on the output voltage is
absolute, and does not scale with trim or load.
Trim Mode and Output Trim Control
When the input voltage is initially applied to a DCM, and after tINIT
elapses, the trim pin voltage V TR is sampled. The TR pin has an
internal pull‑up resistor to VCC, so unless external circuitry pulls the
pin voltage lower, it will pull up to VCC. If the initially sampled trim
pin voltage is higher than V TRIM-DIS-TH, then the DCM will disable
trimming as long as the VIN remains applied. In this case, for all
subsequent operation the output voltage will be programmed to
the nominal. This minimizes the support components required
for applications that only require the nominal rated VOUT, and
also provides the best output setpoint accuracy, as there are no
additional errors from external trim components.
If at initial application of VIN, the TR pin voltage is prevented from
exceeding V TRIM-EN-TH, then the DCM will activate trim mode, and it
will remain active for as long as VIN is applied.
VOUT set point under full load and room temperature can be
calculated using the equation below:
VOUT-FL @ 25ºC = 19.95 + (37.560 • VTR / VCC) (3)
Note that the trim mode is not changed when a DCM recovers
from any fault condition or being disabled.
Module performance is guaranteed through output voltage trim
range VOUT-TRIMMING. If VOUT is trimmed above this range, then
certain combinations of line and load transient conditions may
trigger the output OVP.
The largest modification to the actual output voltage compared
to the programmed output is due to the 5.263% VOUT-NOM load
line, which for this model corresponds to ΔVOUT-LOAD of 2.5262V.
As the load is reduced, the internal error amplifier reference,
and by extension the output voltage, rises in response. This load
line is the primary enabler of the wireless current sharing among
an array of DCMs.
The load line impact on the output voltage is absolute, and does
not scale with programmed trim voltage.
DCM™ DC-DC Converter
Rev 1.7
Page 20 of 28 03/2022
DCM3623x50M53C2yzz
Overall Output Voltage Transfer Function
Taking load line (Equation 1), temperature coefficient
(Equation 2) and trim (Equation 3) into account, the general
equation relating the DC VOUT to programmed trim (when active),
load and temperature is given by:
VOUT = 19.95 + (37.560 • VTR / VCC)
+ 2.5262 • (1 – IOUT / 6.67)
-6.400 • 0.001 • (TINT – 25) + ΔVOUT-LL (4)
Finally, note that when the load current is below 10% of the
rated capacity, there is an additional ΔV which may add to the
output voltage, depending on the line voltage which is related to
light-load boosting. Please see the section on light-load boosting
below for details.
Use 0V for ΔVOUT-LL when load is above 10% of rated load. See
section on light-load boosting operation for light-load effects on
output voltage.
Output Current Limit
The DCM features a fully operational current limit which effectively
keeps the module operating inside the Safe Operating Area (SOA)
for all valid trim and load profiles. The current limit approximates
a “brick wall” limit, where the output current is prevented from
exceeding the current limit threshold by reducing the output
voltage via the internal error amplifier reference. The current limit
threshold at nominal trim and below is typically 120% of rated
output current, but it can vary between 100% to 143%. In order
to preserve the SOA, when the converter is trimmed above the
nominal output voltage, the current limit threshold is automatically
reduced to limit the available output power.
When the output current exceeds the current limit threshold,
current limit action is held off by 1ms, which permits the DCM to
momentarily deliver higher peak output currents to the load. Peak
output power during this time is still constrained by the internal
Power Limit of the module. The fast Power Limit and relatively slow
Current Limit work together to keep the module inside the SOA.
Delaying entry into current limit also permits the DCM to minimize
droop voltage for load steps.
Sustained operation in current limit is permitted, and no de‑rating
of output power is required, even in an array configuration.
Line Impedance, Input Slew Rate and Input
Stability Requirements
Connect a high-quality, low-noise power supply to the +IN and –IN
terminals. Additional capacitance may have to be added between
+IN and –IN to make up for impedances in the interconnect cables
as well as deficiencies in the source.
Excessive source impedance can bring about system stability issues
for a regulated DC-DC converter, and must either be avoided or
compensated by filtering components. A 1000µF input capacitor
is the minimum recommended in case the source impedance is
insufficient to satisfy stability requirements.
For selecting optimum value of decoupling capacitor, refer to
section 2 of the DCM Design Guide.
Additional information can be found in the filter design
application note AN:023.
Please refer to this input filter design tool to ensure input stability.
Ensure that the input voltage slew rate is less than 1V/µs,
otherwise a pre-charge circuit is required for the DCM input to
control the input voltage slew rate and prevent overstress to input
stage components.
Input Fuse Selection
The DCM is not internally fused in order to provide flexibility in
configuring power systems. Input line fusing is recommended at
the system level, in order to provide thermal protection in case of
catastrophic failure. The fuse shall be selected by closely matching
system requirements with the following characteristics:
n
Current rating
(usually greater than the DCM converter’s maximum current)
n
Maximum voltage rating
(usually greater than the maximum possible input voltage)
n
Ambient temperature
n
Breaking capacity per application requirements
n
Nominal melting I2t
n
Recommended fuse:
See Safety Approvals for recommended fuse
Some applications may benefit from well matched current
distribution, in which case fine tuning sharing via the trim pins
permits control over sharing. The DCM does not require this
for proper operation, due to the power limit and current limit
behaviors described here.
Current limit can reduce the output voltage to as little as the
UVP threshold (VOUT-UVP). Below this minimum output voltage
compliance level, further loading will cause the module to shut
down due to the output undervoltage fault protection.
DCM™ DC-DC Converter
Rev 1.7
Page 21 of 28 03/2022
DCM3623x50M53C2yzz
Fault Handling
Output Overvoltage Fault Protection (OVP)
Input Undervoltage Fault Protection (UVLO)
The converter monitors the output voltage during each switching
cycle by a corresponding voltage reflected to the primary side
control circuitry. If the primary sensed output voltage exceeds
VOUT‑OVP, the OVP fault protection is triggered. The control
logic disables the powertrain, and the output voltage of the
converter falls.
The converter’s input voltage is monitored to detect an input
undervoltage condition. If the converter is not already running,
then it will ignore enable commands until the input voltage is
greater than VIN‑UVLO+. If the converter is running and the input
voltage falls below VIN‑UVLO–, the converter recognizes a fault
condition, the powertrain stops switching, and the output voltage
of the unit falls.
Input voltage transients which fall below UVLO for less than tUVLO
may not be detected by the fault protection logic, in which case
the converter will continue regular operation. No protection is
required in this case.
Once the UVLO fault is detected by the fault protection logic, the
converter shuts down and waits for the input voltage to rise above
VIN-UVLO+. Provided the converter is still enabled, it will then restart.
Input Overvoltage Fault Protection (OVLO)
The converter’s input voltage is monitored to detect an input
overvoltage condition. When the input voltage is more than the
VIN‑OVLO+, a fault is detected, the powertrain stops switching, and
the output voltage of the converter falls.
After an OVLO fault occurs, the converter will wait for the input
voltage to fall below VIN‑OVLO–. Provided the converter is still
enabled, the powertrain will restart.
The powertrain controller itself also monitors the input voltage.
Transient OVLO events which have not yet been detected by the
fault sequence logic may first be detected by the controller if
the input slew rate is sufficiently large. In this case, powertrain
switching will immediately stop. If the input voltage falls back in
range before the fault sequence logic detects the out of range
condition, the powertrain will resume switching and the fault
logic will not interrupt operation. Regardless of whether the
powertrain is running at the time or not, if the input voltage does
not recover from OVLO before tOVLO, the converter fault logic will
detect the fault.
Output Undervoltage Fault Protection (UVP)
The converter determines that an output overload or short circuit
condition exists by measuring its primary sensed output voltage
and the output of the internal error amplifier. In general, whenever
the powertrain is switching and the primary-sensed output
voltage falls below VOUT‑UVP threshold, a short circuit fault will be
registered. Once an output undervoltage condition is detected,
the powertrain immediately stops switching, and the output
voltage of the converter falls. The converter remains disabled for
a time tFAULT. Once recovered and provided the converter is still
enabled, the powertrain will again enter the soft‑start sequence
after tINIT and tON.
This type of fault is latched, and the converter will not start again
until the latch is cleared. Clearing the fault latch is achieved by
either disabling the converter via the EN pin, or else by removing
the input power such that the input voltage falls below VIN‑INIT.
External Output Capacitance
The DCM converter internal compensation requires a minimum
external output capacitor. An external capacitor in the range of
200 – 2000µF with ESR of 10mΩ is required, per DCM for control
loop compensation purposes.
However some DCM models require an increase in the minimum
external output capacitor value in certain loading and trim
conditions. In applications where the load can go below 10%
of rated load but the output trim is held constant, the range of
output capacitor required is given by COUT‑EXT‑TRANS in the Electrical
Specifications table. If the load can go below 10% of rated load
and the DCM output trim is also dynamically varied, the range
of output capacitor required is given by COUT‑EXT‑TRANS‑TRIM in the
Electrical Specifications table.
Light-Load Boosting
Under light-load conditions, the DCM converter may operate in
light‑load boosting depending on the line voltage. Light‑load
boosting occurs whenever the internal power consumption of the
converter combined with the external output load is less than the
minimum power transfer per switching cycle. In order to maintain
regulation, the error amplifier will switch the powertrain off and on
repeatedly, to effectively lower the average switching frequency,
and permit operation with no external load. During the time
when the powertrain is off, the module internal consumption is
significantly reduced, and so there is a notable reduction in no-load
input power in light‑load boosting. When the load is less than 10%
of rated IOUT, the output voltage may rise by a maximum of 5.05V,
above the output voltage calculated from trim, temperature and
load line conditions.
Temperature Fault Protections (OTP)
The fault logic monitors the internal temperature of the converter.
If the measured temperature exceeds TINT‑OTP, a temperature fault
is registered. As with the undervoltage fault protection, once
a temperature fault is registered, the powertrain immediately
stops switching, the output voltage of the converter falls, and
the converter remains disabled for at least time tFAULT. Then, the
converter waits for the internal temperature to return to below
TINT‑OTP before recovering. Provided the converter is still enabled,
the DCM will restart after tINIT and tON.
DCM™ DC-DC Converter
Rev 1.7
Page 22 of 28 03/2022
DCM3623x50M53C2yzz
Thermal Considerations
Based on the safe thermal operating area shown on Page 5, the
full rated power of the DCM3623x50M53C2yzz can be processed
provided that the top, bottom and leads are all held below
95ºC. These curves highlight the benefits of dual‑sided thermal
management, but also demonstrate the flexibility of the Vicor
ChiP™ platform for customers who are limited to cooling only the
top or the bottom surface.
The OTP sensor is located on the top side of the internal PCB
structure. Therefore in order to ensure effective overtemperature
fault protection, the case bottom temperature must be constrained
by the thermal solution such that it does not exceed the
temperature of the case top.
The ChiP package provides a high degree of flexibility in that it
presents three pathways to remove heat from internal power
dissipating components. Heat may be removed from the top
surface, the bottom surface and the leads. The extent to which
these three surfaces are cooled is a key component for determining
the maximum power that is available from a ChiP, as can be seen
from Figure 23.
Since the ChiP has a maximum internal temperature rating, it is
necessary to estimate this internal temperature based on a real
thermal solution. Given that there are three pathways to remove
heat from the ChiP, it is helpful to simplify the thermal solution into
a roughly equivalent circuit where power dissipation is modeled as
a current source, isothermal surface temperatures are represented
as voltage sources and the thermal resistances are represented as
resistors. Figure 23 shows the “thermal circuit” for a 3623 ChiP
DCM, in an application where both case top and case bottom
and leads are cooled. In this case, the DCM power dissipation is
PDTOTAL and the three surface temperatures are represented as
TCASE_TOP, TCASE_BOTTOM and TLEADS. This thermal system can now be
very easily analyzed with simple resistors, voltage sources, and a
current source.
This analysis provides an estimate of heat flow through the various
pathways as well as internal temperature.
Thermal Resistance Bottom
θINT-BOTTOM ºC / W
Power Dissipation (W)
TCASE_BOTTOM(°C)
Thermal Resistance Bottom
θINT-BOTTOM ºC / W
TLEADS(°C)
+
–
TLEADS(°C)
+
–
TCASE_TOP(°C)
+
–
Figure 24 — One-side cooling and leads thermal model
Figure 24 shows a scenario where there is no bottom‑side cooling.
In this case, the heat flow path to the bottom is left open and the
equations now simplify to:
TINT – PD1 • θINT-TOP = TCASE_TOP
TINT – PD3 • θINT-LEADS = TLEADS
PDTOTAL = PD1+ PD3
Thermal Resistance Top
θINT-TOP ºC / W
Thermal Resistance Bottom
θINT-BOTTOM ºC / W
MAX INTERNAL TEMP
Thermal Resistance Leads
θINT-LEADS ºC / W
TCASE_BOTTOM(°C)
Power Dissipation (W)
TLEADS(°C)
TCASE_TOP(°C)
+
–
Figure 25 — One-side cooling thermal model
Figure 25 shows a scenario where there is no bottom‑side and
leads cooling. In this case, the heat flow path to the bottom is left
open and the equations now simplify to:
TINT – PD1 • θINT-TOP = TCASE_TOP
PDTOTAL = PD1
Thermal Resistance Leads
θINT-LEADS ºC / W
+
–
Thermal Resistance Leads
θINT-LEADS ºC / W
TCASE_BOTTOM(°C)
Power Dissipation (W)
MAX INTERNAL TEMP
Thermal Resistance Top
θINT-TOP ºC / W
MAX INTERNAL TEMP
Thermal Resistance Top
θINT-TOP ºC / W
TCASE_TOP(°C)
+
–
Vicor provides a suite of online tools, including a simulator and
thermal estimator which greatly simplify the task of determining
whether or not a DCM thermal configuration is sufficient for a
given condition. These tools can be found at:
www.vicorpower.com/powerbench.
Figure 23 — Double-side cooling and leads thermal model
Symbol
Thermal Impedance
(°C/W)
θINT-TOP
2.0
to maximum-temperature internal
component from isothermal top
θINT-LEADS
4.5
to maximum-temperature internal
component from isothermal leads
θINT-BOTTOM
2.2
to maximum-temperature internal
component from isothermal bottom
Alternatively, equations can be written around this circuit and
analyzed algebraically:
TINT – PD1 • θINT-TOP = TCASE_TOP
TINT – PD2 • θINT-BOTTOM = TCASE_BOTTOM
TINT – PD3 • θINT-LEADS = TLEADS
PDTOTAL = PD1+ PD2+ PD3
Where TINT represents the internal temperature and PD1, PD2 and
PD3 represent the heat flow through the top side, bottom side and
leads respectively.
Definition of Estimated
Thermal Resistance
Thermal Capacity
17.7Ws/°C
Table 1 — Thermal data
DCM™ DC-DC Converter
Rev 1.7
Page 23 of 28 03/2022
DCM3623x50M53C2yzz
Array Operation
COUT-EXT-x:
electrolytic or tantalum capacitor with at least
10mΩ ESR, 200µF ≤ COUT-EXT ≤ 2000µF;
additional ceramic /electrolytic capacitors, if needed
C3, C 4:
for output ripple filtering;
In order to help sensitive signal circuits reject potential noise,
additional components are recommended:
A decoupling network is needed to facilitate paralleling:
n
An output inductor should be added to each DCM, before the
outputs are bussed together to provide decoupling.
n
Each DCM needs a separate input filter, even if the multiple
DCMs share the same input voltage source. These filters limit
the ripple current reflected from each DCM, and also help
suppress generation of beat frequency currents that can result
when multiple powertrains input stages are permitted to
directly interact.
R2_x:
FB1_x, C2_x:
If signal pins (TR, EN, FT) are not used, they can be left floating,
and DCM will work in the nominal output condition.
301Ω, facilitate noise attenuation for TR pin;
FB1 is a ferrite bead with an impedance of at least
10Ω at 100MHz. C2_x can be a ceramic capacitor of
0.1µF. Facilitate noise attenuation for EN pin.
Note: Use an RCR filter network as suggested in the application
note AN:030 to reduce the noise on the signal pins.
When common‑mode noise in the input side is not a concern,
TR and EN can be driven and FT received using a single Kelvin
connection to the shared –IN as a reference.
Note: In case of the excessive line inductance, a properly
sized decoupling capacitor CDECOUPLE is required as shown in
Figure 26 and Figure 27.
Note: For more information on parallel operation of DCMs, refer to
“Parallel DCMs” application note AN:030.
When common‑mode noise rejection in the input side is needed,
common‑mode chokes can be added in the input side of each
DCM. An example of DCM paralleling circuit is shown in Figure 27.
An example of DCM paralleling circuit is shown in Figure 26.
Notice that each group of control pins need to be individually
driven and isolated from the other groups control pins. This is
because –IN of each DCM can be at a different voltage due to the
common mode chokes. Attempting to share control pin circuitry
could lead to incorrect behavior of the DCMs.
Filter components
Input filter: The choice of the input filter components varies up
on the low line and maximum output power of the
DCM. Refer to the Filtering Guidelines Introduction
section in the DCM Design Guide to design
an input filter.
Output filter:
Reference
Designator
Value
Mfg. Part Number & Count/DCM
C2_1
80μF
L2_1, L2_2
0.33μH
744309033, #1
Rd_1, Rd_2
0.05Ω
RL2512FK-070R05L, #1
Lb_1, Lb_2
72nH
IFLR2727EZER72NM01, #1
GRM32EC72A106KE05L, #8
VTR VEN
EMI_GND
F1_1
VIN
CDECOUPLE
C1_1
DCM1
TR
EN
FB1_1
Rdm_1
FT
C5_1
CY
L1_1
R2_1
CY
Rd_1
Cd_1
+IN
+OUT
–IN
–OUT
CY
DCM2
EN
Rd_2
Cd_2
≈≈
CY
≈≈
CY
C1_8
Rd_8
–IN
–OUT
C5_8
Lb1_2
L2_2
ROUT-EXT_2
C2_2
COUT-EXT_2
≈≈
CY
DCM8
EN
R3
R4
D1
Cd_8
+OUT
CY
TR
FB1_8
L1_8
+IN
≈
R2_8
F1_8
Rdm_2
FT
C5_2
CY
C1_2
C2_1
COUT-EXT_1
TR
FB1_2
L1_2
ROUT-EXT_1
CY
R2_2
F1_2
Lb1_1
L2_1
Rdm_8
FT
CY
+IN
+OUT
–IN
–OUT
ROUT-EXT_8
COUT-EXT_8
Shared –IN Kelvin
CY
Figure 26 — DCM paralleling configuration circuit 1
DCM™ DC-DC Converter
Rev 1.7
Page 24 of 28 03/2022
CY
Lb1_8
L2_8
C2_8
C3
C4
Load
DCM3623x50M53C2yzz
R2_1
+
EMI_GND
F1_1
VIN
VTR1
CY
T1_1
CDECOUPLE
C1_1
+ FB1_1
C5_1
VEN1
_
Rd_1
_
DCM1
TR
EN
R3_1
FT
CY
+IN
+OUT
–IN
–OUT
CY
R2_2
VTR2
CY
T1_2
C1_2
+ FB
1_2
C5_2
VEN2
_
Rd_2
_
R3_2
R4_2
D1_2
Cd_2
DCM2
EN
FT
CY
+IN
+OUT
–IN
–OUT
CY
R2_8
+
VTR8
CY
C1_8
_
Rd_8
FB1_8
VEN8
C5_8
_
R3_8
R4_8
Cd_8
D1_8
FT
CY
+IN
+OUT
–IN
–OUT
Maximum Power Dissipation (W)
50
40
30
20
10
Top only at
temperature
40
60
Top and leads at
temperature
80
≈≈
100
Top, leads and
bottom at
temperature
Figure 28 — Thermal specified operating area: max power
dissipation vs. case temp for arrays or
current‑limited operation
DCM™ DC-DC Converter
Rev 1.7
Page 25 of 28 03/2022
Rdm_8
Lb_8
L1_8
RCOUT-EXT_8
COUT-EXT_8
CY
DCMs in current limit will operate with higher output current or
power than the rated levels. Therefore the following Thermal Safe
Operating Area plot should be used for arrays or loads that drive
the DCM in to current limit for sustained operation.
Temperature (°C)
C2_2
DCM8
An array of DCMs used at the full array rated power may
generally have one or more DCMs operating at current limit, due
to sharing errors. Load sharing is functionally managed by the
load line. Thermal balancing is improved by the nominal effective
temperature coefficient of the output voltage set point.
20
RCOUT-EXT_2
COUT-EXT_2
EN
Figure 27 — DCM paralleling configuration circuit 2
0
Lb_2
L1_2
TR
CY
0
Rdm_2
CY
+
T1_8
C3
C2_1
COUT-EXT_1
TR
≈≈
F1_8
RCOUT-EXT_1
CY
+
F1_2
Lb_1
L1_1
R4_1
D1_1
Cd_1
Rdm_1
C2_8
C4
Load
DCM3623x50M53C2yzz
DCM Module Product Outline Drawing Recommended PCB Footprint and Pinout
3623 THRU HOLE
(Reference DWG # 40260 Rev 5)
38.72±.38
1.524±.015
11.43
.450
19.36
.762
0
1.52
.060
(2) PL.
11.40
.449
0
0
22.80±.13
.898±.005
1.02
.040
(3) PL.
0
1.52
.060
(4) PL.
TOP VIEW (COMPONENT SIDE)
.05 [.002]
7.21±.10
.284±.004
SEATING
.
PLANE
4.17
.164
(9) PL.
0
18.60
.732
18.60
.732
.41
.016
(9) PL.
8.25
.325
8.00
.315
2.75
.108
0
0
2.75
.108
1.38
.054
4.13
.162
1.38
.054
8.00
.315
0
8.25
.325
8.00±.08
.315±.003
4.13±.08
.162±.003
1.38±.08
.054±.003
+IN
0
2.03
.080
PLATED THRU
.25 [.010]
ANNULAR RING
(2) PL.
2.75±.08
.108±.003
-OUT
TR
0
EN
FT
8.00±.08
.315±.003
8.25±.08
.325±.003
+OUT
-IN
+OUT
2.75±.08
.108±.003
-OUT
8.25±.08
.325±.003
0
1.38±.08
.054±.003
0
18.60±.08
.732±.003
1.52
.060
PLATED THRU
.25 [.010]
ANNULAR RING
(3) PL.
18.60±.08
.732±.003
BOTTOM VIEW
RECOMMENDED HOLE PATTERN
(COMPONENT SIDE)
NOTES:
1- UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE MM [INCH]
2- TOLERANCES ARE:
DECIMALS
X.XX [X.XX] = ±0.25 [0.01]
X.XXX [X.XXX] = ±0.127 [0.005]
ANGLES = ±1°
DCM™ DC-DC Converter
Rev 1.7
Page 26 of 28 03/2022
2.03
.080
PLATED THRU
.38 [.015]
ANNULAR RING
(4) PL.
DCM3623x50M53C2yzz
Revision History
Revision
Date
Description
Page Number(s)
1.0
09/19/16
Release of current data sheet with new part number
1.1
01/20/17
Updated powertrain protection specs
7
1.2
04/28/17
Added 2 decimal points to the UVLO and OVLO powertrain protection specifications
7
Updated typical applications
Updated height and length specifications
Updated mechanical drawing
Updated typical applications
Updated timing diagrams
Corrected previous part number
Updated rated output voltage trim range note
Updated high level functional state diagram
Added MIL-STD info
Added insulation resistance specification
1.3
09/15/17
1.4
10/11/18
1.5
06/29/20
1.6
10/27/20
Typo correction
03/01/22
Updated agency approvals
Revised array operation section
Added C-grade part number and related specs
Updated format, pages added
1.7
DCM™ DC-DC Converter
Rev 1.7
Page 27 of 28 03/2022
n/a
1
15
23
1
10, 11
16
6
9
1
18
1
1, 5
23
5, 7, 8
ALL
DCM3623x50M53C2yzz
Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor
makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves
the right to make changes to any products, specifications, and product descriptions at any time without notice. Information published by
Vicor has been checked and is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies.
Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
Specifications are subject to change without notice.
Visit http://www.vicorpower.com/dc-dc/isolated-regulated/dcm for the latest product information.
Vicor’s Standard Terms and Conditions and Product Warranty
All sales are subject to Vicor’s Standard Terms and Conditions of Sale, and Product Warranty which are available on Vicor’s webpage
(http://www.vicorpower.com/termsconditionswarranty) or upon request.
Life Support Policy
VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE
EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used
herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and
whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to
result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform
can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. Per Vicor Terms
and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemnifies
Vicor against all liability and damages.
Intellectual Property Notice
Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications) relating to the
products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property
rights is granted by this document. Interested parties should contact Vicor’s Intellectual Property Department.
The products described on this data sheet are protected by the following U.S. Patents Numbers:
RE40,072; 7,561,446; 7,920,391; 7,782,639; 8,427,269; 6,421,262; 9,516,761 and other patents pending.
Contact Us: http://www.vicorpower.com/contact-us
Vicor Corporation
25 Frontage Road
Andover, MA, USA 01810
Tel: 800-735-6200
Fax: 978-475-6715
www.vicorpower.com
email
Customer Service: custserv@vicorpower.co
Technical Support: apps@vicorpower.com
©2017 – 2022 Vicor Corporation. All rights reserved. The Vicor name is a registered trademark of Vicor Corporation.
All other trademarks, product names, logos and brands are property of their respective owners.
DCM™ DC-DC Converter
Rev 1.7
Page 28 of 28 03/2022
工商网监
湘ICP备2023018690号
