DCM™ DC-DC Converter
DCM4623xC8G16F0yzz
®
S
US
C
C
NRTL
US
Isolated, Regulated DC Converter
Features & Benefits
Product Ratings
• Isolated, regulated DC-DC converter
Operating Input (V)
• Up to 600W, 43.5A continuous
• 93.6% peak efficiency
• 1239W/in3 Power density
Output Power
Max (W)
Output Voltage (V)
100% load, 25°C
VOUT = 13.8V
(11.5 – 15.5V Trim)
Min
Nom
Max
200
290
378
600
420
500
160
• Wide extended input range 160 – 420VDC
• Safety Extra Low Voltage (SELV) 13.8V Nominal Output
P (W)
• 4242VDC isolation
600
• ZVS high frequency (MHz) switching
Enables low-profile, high-density filtering
500
• Optimized for array operation
Up to 8 units – 4800W
No power derating needed
Sharing strategy permits dissimilar line voltages
across an array
• Fully operational current limit
• OV, OC, UV, short circuit and thermal protection
• 4623 through-hole ChiP™ package
1.886 x 0.898 x 0.284in
[47.91 x 22.8 x 7.21mm]
Typical Applications
• Transportation
• Industrial Systems
• Electric Vehicle (EV) / Hybrid Electric Vehicle (HEV)
• On-board Power
160 200
378
420 Vin (V)
Product Description
The DCM Isolated, Regulated DC Converter is a DC-DC converter,
operating from an unregulated, wide range input to generate an
isolated 13.8VDC 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.
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.
Note: Product images may not highlight current product markings.
DCM™ DC-DC Converter
Page 1 of 27
Rev 1.4
06/2019
DCM4623xC8G16F0yzz
Typical Application
VTR
DCM1
R2_1
EMI_GND
F1_1
HV Battery +
(160 –420V) –
C1_1
EN
+ FB1_1
C5_1
CY
L1_1
Rd_1
TR
VEN1
R3_1
_
–
R4_1
D1_1
CY
+IN
Cd_1
RCOUT-EXT_1
–IN
–OUT
Rd_2
DCM2
R3_2
_
–
R4_2
D1_2
CY
+IN
+OUT
–IN
–OUT
C2_2
COUT-EXT_2
CY
Rd_4
≈≈
DCM4
TR
EN
+ FB1_8
C5_8
CY
C1_4
L2_2
RCOUT-EXT_2
R2_8
L1_4
Lb_2
Rdm_2
FT
CY
F1_4
C4
TR
VEN2
Cd_2
≈≈
C3
EN
+ FB1_2
C5_2
CY
C1_2
C2_1
COUT-EXT_1
CY
R2_2
F1_2
L2_1
+OUT
CY
L1_2
Lb_1
Rdm_1
FT
VEN8
R3_8
_
–
R4_8
D1_8
Cd_4
Lb_4
Rdm_4
FT
CY
+IN
+OUT
–IN
–OUT
L2_4
RCOUT-EXT_4
COUT-EXT_4
C2_4
CY
CY
Typical application 1: DCM4623xC8G16F0yzz for EV/HEV applications
DCM
TR
EMI_GND
EN
FT
F1
CY
L1
+IN
C1
300V
CY
Rdm
Lb
L2
+OUT
13.8V
RCOUT-EXT
Rd
Cd
COUT-EXT
–OUT
–IN
CY
ZVS Buck
ZVS Buck
CY
ZVS Buck
ZVS Buck
DCM
TR
EMI_GND
ZVS Buck
EN
FT
F1
200V
CY
L1
CY
+IN
C1
RCOUT-EXT
Cd
COUT-EXT
–OUT
CY
Typical application 2: DCM4623xC8G16F0yzz + ZVS Buck point-of-load
Rev 1.4
06/2019
Lb
ZVS Buck
L2
+OUT
CY
DCM™ DC-DC Converter
Page 2 of 27
Rdm
Rd
–IN
5V
C2
C2
3.3V
+
–
LV Battery
(12V)
DCM4623xC8G16F0yzz
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
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 3 of 27
Function
Positive input power terminal
Fault monitoring
Rev 1.4
06/2019
DCM4623xC8G16F0yzz
Part Ordering Information
Part Number
Temperature Grade
DCM4623TC8G16F0T00
T = –40 to 125°C
DCM4623TC8G16F0M00
M = –55 to 125°C
Option
Tray Size
00 = Analog Control
Interface Version
20 parts per tray
All products shipped in JEDEC standard high-profile (0.400” thick) trays (JEDEC Publication 95, Design Guide 4.10).
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
Min
Max
Unit
Continuous
–0.5
460
V
100ms with a maximum duty cycle of 10%
–0.5
550
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
25
V
Input Voltage (+IN to –IN)
Comments
Input Voltage Slew Rate
FT to –IN
Output Voltage (+OUT to –OUT)
Dielectric Withstand (Input to Output)
Internal Operating Temperature
Storage Temperature
–0.5
Reinforced insulation
4242
T-Grade
–40
125
M-Grade
–55
125
T-Grade
–40
125
M-Grade
–65
125
Average Output Current
53.46
Maximum Output Power (W)
700
600
500
400
300
200
100
0
0
25
50
75
100
125
150
Temperature (°C)
Top only at temperature
Top and leads at temperature
Top, leads and belly at temperature
Thermal specified operating area: max output power vs. case temp, single unit at minimum full-load efficiency
DCM™ DC-DC Converter
Page 4 of 27
VDC
Rev 1.4
06/2019
ºC
ºC
A
DCM4623xC8G16F0yzz
Electrical Specifications
Specifications apply over all line in VIN-EXTENDED, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications
apply over the temperature range of –40ºC < TINT < 125ºC for T-Grade and –55ºC < TINT < 125ºC for M-Grade.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
200
290
378
V
160
290
420
V
Power Input Specification
Input Voltage Range, Full Power
Input Voltage Range, Extended
Inrush Current (Peak)
VIN
VIN-EXTENDED
IINRP
Module will only start up if input voltage is inside the
range of VIN. After start up, Module can then operate
in the entire VIN-EXTENDED range
8.5
With maximum COUT-EXT, full resistive load
A
Input Capacitance (Internal)
CIN-INT
Effective value at nominal input voltage
0.8
µF
Input Capacitance (Internal) ESR
RCIN-INT
At 1MHz
2.5
mΩ
Input Inductance (External)
LIN
Input Capacitance (External)
CIN-EXT
5
Differential mode, with no further line bypassing
Effective value at nominal input voltage
0.68
µH
µF
No Load Specification
Input Power – Disabled
PQ
Input Power – Enabled With No Load
PNL
Nominal line, see Fig. 2
1.3
Worst case line, see Fig. 2
Nominal line, see Fig. 3
3
Worst case line, see Fig. 3
1.8
W
2.5
W
4
W
15
W
Power Output Specification
Output Voltage Set Point
Output Voltage Trim Range
Output Voltage Load Regulation
Output Voltage
Light-Load Regulation [a]
Output Voltage
Temperature Coefficient
VOUT Accuracy
VOUT-NOM
VIN = 290V, trim inactive, at 100% Load, TINT = 25°C
13.66
13.8
13.94
V
VOUT-TRIMMING
Trim range over temp, at full load. Specifies the Low,
Nominal and High Trim conditions.
11.5
13.8
15.5
V
0.7263
0.8032
V
ΔVOUT-LOAD
ΔVOUT-LL
ΔVOUT-TEMP
Linear load line. Output voltage increase from full rated
load current to no load (Does not include light load
0.6503
regulation). See Fig. 5 and Sec. Design Guidelines
0 – 5% load, VIN > 378V, TCASE < 25ºC
0.0
2.7
V
0 – 5% load, VIN > 378V, TCASE ≥ 25ºC
0 – 5% load, VIN ≤ 378V, TCASE < 25ºC
0.0
2.3
V
0 – 5% load, VIN ≤ 378V, TCASE ≥ 25ºC
0.0
1.5
V
Nominal, linear temperature coefficient, relative to
TINT = 25 ºC. See Fig. 4 and Sec. Design Guidelines
The total output voltage set-point accuracy from the
%VOUT-ACCURACY calculated ideal Vout based on load, temp and trim.
Excludes ΔVOUT-LL
–1.84
–2.0
mV/°C
2.0
%
Rated Output Power
POUT
Continuous, VOUT ≥ 13.8V, 200V ≤ VIN ≤ 378V
600
W
Rated Output Current
IOUT
Continuous, VOUT ≤ 13.8V, 200V ≤ VIN ≤ 378V
43.5
A
Derated Output Power
POUT-DERATED
500
W
Derated Output Current
IOUT-DERATED
36.2
A
Continuous, VOUT ≥ 13.8V,
160V < VIN < 200V or 378V < VIN < 420V
Continuous, VOUT ≤ 13.8V,
160V < VIN < 200V or 378V < VIN < 420V
Output Current Limit
IOUT-LM
Of IOUT max. Fully operational current limit
Current Limit Delay
tIOUT-LIM
The module will power limit in a fast transient event
Efficiency
Output Voltage Ripple
[a]
η
VOUT-PP
112
123
%
1
ms
93.6
%
Full Load, Nominal Line, trim inactive
92.9
Full Load, over VIN and temperature, trim inactive
91.5
%
Full Load, over VIN-EXTENDED and temperature, trim inactive
90.5
%
50% Load, over line, temperature and trim
90.0
%
Over all operating steady-state line, load and trim
conditions, 20MHz BW, with minimum COUT-EXT
Additional VOUT relative to calculated load line point; see Figure 5 and Design Guidelines section.
DCM™ DC-DC Converter
Page 5 of 27
100
Rev 1.4
06/2019
500
mV
DCM4623xC8G16F0yzz
Electrical Specifications (Cont.)
Specifications apply over all line in VIN-EXTENDED, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications
apply over the temperature range of –40ºC < TINT < 125ºC for T-Grade and –55ºC < TINT < 125ºC 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 (Internal) ESR
RCOUT-INT
Output Capacitance (External)
COUT-EXT
At 1MHz
Electrolytic Capacitor preferred. Excludes component
tolerances and temperature coefficient
Output Capacitance, ESR (Ext.)
RCOUT-EXT
At 10kHz, excludes component tolerances
72
µF
0.06
mΩ
1000
10000
10
mΩ
Initialization Delay
tINIT
After input voltage first exceeds VIN-INIT
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
Start-up Set-Point Aquisition Time
tSS
Full load (soft-start ramp time) with minimum COUT-EXT
VOUT Threshold for Max
Rated Load Current
IOUT at Start Up
Monotonic Soft-Start
Threshold Voltage
Minimum Required
Disabled Duration
Minimum Required Disabled
Duration for Predictable Pestart
Voltage Deviation (transient)
Settling Time
VOUT-FL-THRESH
IOUT-START
During start up, VOUT must achieve this threshold
before output can support full rated current
Max load current at start up while VOUT
is below VOUT-FL-THRESH
µF
40
ms
µs
600
5.0
µs
ms
10.5
0.1
V
A
At start up, the DCM output voltage rise becomes
VOUT-MONOTONIC monotonic with a minimum of 25% pre-load once it crosses
VOUT-MONOTONIC, standalone or as a member in an array
10.5
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
COUT_EXT = min; (10 ↔ 90% load step), excluding
load line. Load slew rate < 43.5A/ms
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
Page 8 of 27
Rev 1.4
06/2019
Powertrain: Stopped
FT = True
DCM™ DC-DC Converter
Page 9 of 27
Output
Input
Rev 1.4
06/2019
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
DCM4623xC8G16F0yzz
Timing Diagrams
Module Inputs are shown in blue; Module Outputs are shown in brown.
DCM™ DC-DC Converter
Rev 1.4
Page 10 of 27 06/2019
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
DCM4623xC8G16F0yzz
Timing Diagrams (Cont.)
Module Inputs are shown in blue; Module Outputs are shown in brown.
DCM4623xC8G16F0yzz
Typical Performance Characteristics
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
16
14
Output Voltage (V)
Output Voltage (V)
16
12
10
8
6
5
10
15
20
25
30
35
40
45
15
14
13
12
11
50
-40
-20
0
Low Trim
Nom Trim
High Trim
Condition:
Figure 1 — Electrical specified operating area
40
60
80
100
Nominal Trim
Minimum trim
Maximum Trim
Figure 4 — VOUT vs. operating temperature trend,
at full load and nominal line
18
2.5
16
2
Output Voltage (V)
Power Dissipation (W)
20
Baseplate Temperature (°C)
Average Output Current (A)
1.5
1
0.5
0
160
186
212
238
264
290
316
342
368
394
–40ºC
25ºC
12
10
8
6
420
Input Voltage (V)
TCASE:
14
0
10
20
30
40
50
60
70
80
90
100
Load Current (%)
90ºC
Condition:
Figure 2 — Disabled power consumption vs. VIN
Nominal Trim
Minimum trim
Maximum Trim
Figure 5 — VOUT vs. load current trend, at room temperature
and nominal line
Power Dissipation (W)
9
8
7
6
5
4
3
2
1
0
160
186
212
238
264
290
316
342
368
394
420
Input Voltage (V)
TCASE:
–40ºC
25ºC
90ºC
Figure 3 — No load power dissipation vs. VIN, at nominal trim
Figure 6 — Initial start up from EN pin, with soft-start ramp.
VIN = 290V, COUT_EXT = 10000µF, RLOAD = 0.317Ω
DCM™ DC-DC Converter
Rev 1.4
Page 11 of 27 06/2019
DCM4623xC8G16F0yzz
Typical Performance Characteristics (Cont.)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
94.0
Efficiency (%)
93.5
93.0
92.5
92.0
91.5
160
186
212
238
264
290
316
342
368
394
420
Input Voltage (V)
TCASE:
-40°C
25°C
90°C
Figure 7 — Full-load efficiency vs. VIN, VOUT = 11.5V
94.0
Efficiiency (%)
93.5
93.0
92.5
92.0
91.5
160
186
212
238
264
290
316
342
368
394
420
Input Voltage (V)
TCASE:
-40°C
25°C
90°C
Figure 8 — Full-load efficiency vs. VIN, VOUT = 13.8V
94.0
Efficiiency (%)
93.5
93.0
92.5
92.0
91.5
160
186
212
238
264
290
316
342
368
394
420
Input Voltage (V)
TCASE:
-40°C
25°C
90°C
Figure 9 — Full-load efficiency vs. VIN, VOUT = 15.5V
DCM™ DC-DC Converter
Rev 1.4
Page 12 of 27 06/2019
DCM4623xC8G16F0yzz
Typical Performance Characteristics (Cont.)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
50
94
Power Dissipation (W)
Efficiency (%)
92
90
88
86
84
82
80
10
20
30
40
50
60
70
80
90
45
40
35
30
25
20
15
10
5
100
10
20
30
Load Current (%)
160V
VIN:
290V
420V
70
80
90
100
290V
420V
50
Power Dissipation (W)
90
88
86
84
82
10
20
30
40
50
60
70
80
90
45
40
35
30
25
20
15
10
5
100
10
20
30
Load Current (%)
160V
VIN:
290V
40
50
60
70
80
90
100
Load Current (%)
420V
160V
VIN:
Figure 11 — VIN to VOUT efficiency, TCASE = 90°C
290V
420V
Figure 14 — Power dissipation vs. VIN to IOUT, TCASE = 90°C
50
94
Power Dissipation (W)
92
Efficiency (%)
60
Figure 13 — Power dissipation vs. VIN to IOUT, TCASE = –40°C
92
Efficiency (%)
160V
VIN:
94
90
88
86
84
82
80
50
Load Current (%)
Figure 10 — VIN to VOUT efficiency, TCASE = –40°C
80
40
10
20
30
40
50
60
70
80
90
45
40
35
30
25
20
15
10
5
100
10
20
Load Current (%)
VIN:
160V
290V
Figure 12 — VIN to VOUT efficiency, TCASE = 25°C
30
40
50
60
70
80
90
Load Current (%)
420V
VIN:
160V
290V
420V
Figure 15 — Power dissipation vs. VIN to IOUT, TCASE = 25°C
DCM™ DC-DC Converter
Rev 1.4
Page 13 of 27 06/2019
100
DCM4623xC8G16F0yzz
Typical Performance Characteristics (Cont.)
The following figures present typical performance at TC = 25ºC, unless otherwise noted. See associated figures for general trend data.
Figure 16 — 10 – 100% load transient response, VIN = 290V,
nominal trim, COUT_EXT = 1000µF
Figure 19 — 100 – 10% load transient response, VIN = 290V,
nominal trim, COUT_EXT = 1000µF
1100
1000
VIN (V)
160
900
200
800
290
700
378
600
420
500
50
60
70
80
90
Switching Frequency (kHz)
Switching Frequency (kHz)
1100
1000
Nom Trim
800
Load (%)
Low Trim
700
High Trim
600
500
100
VOUT
900
50
60
70
80
90
100
Load (%)
Figure 17 — Powertrain switching frequency vs. load,
at nominal trim
Figure 20 — Powertrain switching frequency vs. load,
at nominal VIN
Effective Capacitance (µF)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
Voltage (V)
400
Figure 18 — Effective internal input capacitance vs.
applied voltage
500
Figure 21 — Typical output voltage ripple, VIN = 290V,
VOUT = 13.8V, COUT_EXT = 1000µF, RLOAD = 0.317Ω
DCM™ DC-DC Converter
Rev 1.4
Page 14 of 27 06/2019
DCM4623xC8G16F0yzz
General Characteristics
Specifications apply over all line in VIN-EXTENDED, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications
apply over the temperature range of –40ºC < TINT < 125ºC.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Mechanical
Length
L
47.53 [1.871]
47.91 [1.886]
48.29 [1.901]
mm [in]
Width
W
22.67 [0.893]
22.8 [0.898]
22.93 [0.903]
mm [in]
Height
H
7.11 [0.280]
7.21 [0.284]
7.31 [0.288]
mm [in]
Volume
Vol
Weight
W
Lead finish
No heat sink
7.93 [0.48]
cm3 [in3]
29.2 [1.03]
g [oz]
Nickel
0.51
2.03
Palladium
0.02
0.15
Gold
0.003
0.05
T-Grade
–40
125
M-Grade
–55
125
µm
Thermal
Operating internal temperature
Thermal resistance top side
Thermal resistance leads
Thermal resistance bottom side
TINT
θINT-TOP
θINT-LEADS
θINT-BOTTOM
°C
Estimated thermal resistance to maximum
temperature internal component from
isothermal top
1.8
°C/W
Estimated thermal resistance to
maximum temperature internal
component from isothermal leads
5.5
°C/W
Estimated thermal resistance to
maximum temperature internal
component from isothermal bottom
1.6
°C/W
21
Ws/°C
Thermal capacity
Assembly
Storage Temperature
ESD Rating
TST
T-Grade
–40
125
°C
M-Grade
–65
125
°C
HBM
Method per Human Body Model Test ESDA/
JEDEC JDS-001-2012
CDM
Charged Device Model JESD22-C101E
CLASS 1C
V
CLASS 2
Soldering [a]
Peak Temperature Top Case
[b]
For further information, please contact
factory applications
Product is not intended for reflow solder attach.
DCM™ DC-DC Converter
Rev 1.4
Page 15 of 27 06/2019
135
°C
DCM4623xC8G16F0yzz
General Characteristics (Cont.)
Specifications apply over all line in VIN-EXTENDED, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications
apply over the temperature range of –40ºC < TINT < 125ºC.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Safety
Isolation Voltage
VHIPOT
IN to OUT
4242
VDC
IN to CASE
2121
VDC
OUT to CASE
2121
VDC
Reliability
MTBF
MIL-HDBK-217 Plus Parts Count - 25ºC
Ground Benign, Stationary, Indoors /
Computer
1.85
MHrs
Telcordia Issue 2, Method I Case 3, 25°C,
100% D.C., GB, GC
2.35
MHrs
Agency Approvals
cTÜVus; EN 60950-1
Agency Approvals / Standards
cURus, UL 60950-1
CE Marked for Low Voltage Directive and RoHS Recast Directive as Applicable.
Previous Part Number
DCM290P138T600A40
DCM™ DC-DC Converter
Rev 1.4
Page 16 of 27 06/2019
DCM4623xC8G16F0yzz
Pin Functions
The DCM will latch trim behavior at application of VIN, and persist
in that same behavior until loss of input voltage.
+IN, –IN
nn
At application of VIN, if TR is sampled at above VTRIM-DIS, 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 is recommended as close as possible
to the pin on the package, to reduce effects of voltage drop due
to –IN currents.
+OUT, –OUT
nn
At application wof VIN, if TR is sampled at below VTRIM-EN, the TR
will serve as an input to control real time output voltage trim. It
will persist in this behavior until VIN is no longer present.
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.
Output power pins.
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.
nn
Output enable: When EN is allowed to pull up above the enable
threshold, the module will be enabled. If leaving EN floating, it is
pulled up to VCC and the module will be enabled.
nn
Output disable: EN may be pulled down externally in order to
disable the module.
nn
EN is an input only, it does not pull low in the event of a fault.
nn
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)
FT (Fault)
The FT pin provides a Fault signal.
Anytime 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 completly 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 over-current FT drive,
thus a resistor in series for current limiting is recommended.
The FT pin becomes active momentarily when the module
starts up.
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 10kΩ resistor.
Typical External Circuits for Signal Pins (TR, EN, FT)
ChiP 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 1.4
Page 17 of 27 06/2019
D
DCM4623xC8G16F0yzz
Design Guidelines
is not changed when a DCM recovers from any fault condition or
being disabled.
Building Blocks and System Design
If V TR is driven above the point where the trimmed VOUT reaches
the maximum trimmed VOUT range, then the VOUT will hold at
the maximum of the trim range, and not wrap around or return
to nominal VOUT.
The DCM™ converter input accepts the full 160 to 420V range,
and it generates an isolated trimmable 13.8VDC 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 DCM4623xC8G16F0yzz may be used in standalone
applications where the output power requirements are up to
600W. However, it is easily deployed as arrays of modules to
increase power handling capacity. Arrays of up to eight units have
been qualified for 4800W capacity. Application of DCM converters
in an array requires no derating 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 sequence.
Notice the module will only start up if the input voltage is within
the range of VIN. After start up, Module can then operate in the
wider input voltage range VIN-EXTENDED.
The soft start sequence 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.
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, 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 set-point 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, 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 = 10.00 + (6.48 • VTR / VCC) (1)
Module performance is guaranteed through output voltage trim
range VOUT-TRIMMING. If VOUT is trimmed higher than that range,
then certain combinations of line and load transient conditions may
trigger the output OVP.
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 output voltage, with modification based
on load and temperature. The nominal output voltage is 13.8V,
and the actual output voltage will match this at full load and room
temperature with trim inactive.
The largest modification to the actual output voltage compared
to the programmed output is due to a 5.263% VOUT-NOM load
line, which for this model corresponds to ΔVOUT-LOAD of 0.73V.
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 amongst
an array of DCMs.
The load line impact on the output voltage is absolute, and is not
scaled by the trim voltage.
Furthermore, when the load current is below 5% of the rated
capacity, there is an additional ∆V added to the output voltage,
which is related to Light Load Boosting. Please see the section on
Light Load Boosting below for details.
For a given programmed output voltage, the actual output voltage
versus load current at for nominal trim, nominal line, and room
temperature is above 5% load given by the following equation:
VOUT = 13.8 + 0.73 – 0.73 • IOUT / 43.5
(2)
Nominal Output Voltage Temperature Coefficient
There is an additional additive term to the programmed output
voltage, which 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 0.138V change every 75°C
over the entire rated temperature range. Regulation coefficient is
relative to 25°C TINT (hottest internal temperature).
For nominal trim, nominal line, and full load, the output voltage
relates to the temperature according to the following equation:
VOUT = 13.8 – 0.138 • (TINT – 25)/75
(3)
where TINT is in °C.
The impact of temperature coefficient on the output voltage is
absolute, and does not scale with trim or load.
Note that while the soft-start routine described above does re-arm
after the unit self-protects from a fault condition, the trim mode
DCM™ DC-DC Converter
Rev 1.4
Page 18 of 27 06/2019
DCM4623xC8G16F0yzz
Overall Output Voltage Transfer Function
Taking trim (Equation 1), load line (Equation 2) and temperature
coefficient (Eqquation 3) into account, the general equation
relating the DC VOUT at nominal line to programmed trim (when
active), load, and temperature is given by:
VOUT = 10.00 + (6.48 • VTR/VCC) + 0.73 +∆V – 0.73
• IOUT /43.5 – 0.138 • (TINT – 25)/75
(4)
Line Impedance, Input Slew Rate and Output
Stability Requirements
Connect a high-quality, low-noise power supply to the +IN and –IN
terminals. An external capacitance of 0.68µF is required. 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.
Use 0V for ∆V when load is from 5% to 100% load, and up to 2.3V
when operating at
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