Q Series
66 - 132 Watt DC-DC Converters
Features
• RoHS lead-free-solder and lead-solder-exempted products
are available
• 5 year warranty for RoHS compliant products with an
extended temperature range
• Class I equipment
• Compliant with EN 45545 (version V106 or later)
• Wide input voltage ranges up to 154 VDC
• 1 or 2 isolated outputs from 3.3 to 24 V
• Flexible output power
• Extremely high efficiency of up to 90%
• Excellent surge and transient protection
• Outputs open and short-circuit proof
• Redundant operation, current sharing
• Extremely low inrush current, hot-swappable
• Externally adjustable output voltage and inhibit
• Electric strength test 2.1 kVDC
• Extremely slim case (4 TE, 20 mm), fully enclosed
111
4.4"
3U
20
0.8"
4 TE
Safety-approved to the latest edition of IEC/EN 62368-1
and UL/CSA 60950-1
164
6.5"
1
1
Table of Contents
Description........................................................................................2
Model Selection.................................................................................2
Functional Description.......................................................................6
Electrical Input Data..........................................................................7
Electrical Output Data.......................................................................9
Auxiliary Functions..........................................................................18
on request
Electromagnetic Compatibility (EMC)..............................................22
Immunity to Environmental Conditions............................................24
Mechanical Data..............................................................................26
Safety and Installation Instructions..................................................27
Description of Options.....................................................................29
Accessories.....................................................................................31
belfuse.com/power-solutions
BCD20011-G Rev AM, 28-Oct-2020
Q Series
66 - 132 W DC-DC Converters
Description
These extremely compact DC-DC converters incorporate all necessary input and output filters, signaling and protection features,
which are required in the majority of applications. The converters provide important advantages such as flexible output power
through primary current limitation, high efficiency, excellent reliability, very low ripple and RFI noise levels, full input to output
isolation, negligible inrush current, overtemperature protection, and input over-/undervoltage lockout.
The converter inputs are protected against surges and transients occurring on the source lines.
The converters are particularly suitable for rugged environment, such as railway applications. They have been designed in
accordance with the European railway standards EN 50155 and EN 50121-3-2. All printed circuit boards are coated with a
protective lacquer.
The outputs are continuously open- and short-circuit proof. An isolated output Power Good signal and LEDs at the front panel
indicate the status of the converter. Test sockets at the front panel allow for a check of the main output voltage.
Full system flexibility and n+1 redundant operating mode are possible due to virtually unrestricted series or parallel connection
capabilities of all outputs. In parallel connection of several converters, automatic current sharing is provided by a single-wire
interconnection.
As a modular power supply or as part of a distributed power supply system, the extremely low-profile design reduces the necessary
power supply volume without sacrificing high reliability. A temperature sensor disables the outputs when the case temperature
exceeds the limit. The outputs are automatically re-enabled, when the temperature drops.
The fully enclosed, black-coated aluminum case acts as a heat sink and an RFI shield. The converters are designed for 19" DINrack systems occupying 3 U/4 TE only, but can also be chassis-mounted by four screws. Fitting an additional heat sink or ordering
options with fitted heat sink is possible as well.
Model Selection
Table 1a: Model Selection BQ, GQ
Output 1
Output 2
Output power 1
Operating input voltage range, efficiency
TA= 71°C
TA= 50°C
Options
Vo nom
Io nom
Io max
Vo nom
Io nom
Io max
Po nom
Po max
Vi min - Vi max
η min2
η typ
Vi min - Vi max
η min2
η typ
[VDC]
[A]
[A]
[VDC]
[A]
[A]
[W]
[W]
14.4 - 36 VDC
[%]
[%]
21.6 - 54 VDC
[%]
[%]
3.3
20
25
-
-
-
66
82
BQ1101-9G
81
5.1
16
20
-
-
-
82
102
BQ1001-9RG
85
86
GQ1001-9RG
85.5
86
12 3
8
10
-
-
-
96
120
BQ2320-9RG
87
88.5
GQ2320-9RG
87
89
15
3
6.6
8
-
-
-
99
120
BQ2540-9RG
87
89
GQ2540-9RG
86.5
88.5
24 3
4.4
5.5
-
-
-
106
132
BQ2660-9RG
88
90.5
GQ2660-9RG
88
90
5.1
GQ1101-9G
-7, B, B1, non-G
7.5
8.5
5.1
7.5
8.5
77
97
BQ2001-9RG
85
86
GQ2001-9RG
85.5
86
12 4
4
5
12 4
4
5
96
120
BQ2320-9RG
87
88.5
GQ2320-9RG
87
89
15 4
3.3
4
15 4
3.3
4
99
120
BQ2540-9RG
87
89
GQ2540-9RG
86.5
88.5
24
2.2
2.75
24
2.2
2.75
106
132
BQ2660-9RG
89
90.5
GQ2660-9RG
88
90
4
4
4
4
-7, P, F, B, B1, non-G
-7, F, B, B1, non-G
-7, P, F, B, B1, non-G
The cumulated power of both outputs cannot exceed the total power for the specified ambient temperature.
See also Output Power at Reduced Temperature.
2
Minimum efficiency at Vi nom, Io nom and TA = 25 °C
3
Double-output models with both outputs connected in parallel
4
Double-output models. The isolated output 2 is a tracking output 1.
1
NFND: Not for new designs.
Preferred for new designs
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Q Series
66 - 132 W DC-DC Converters
Table 1b: Model Selection CQ, 48Q
Output 1
Output 2
Output power 1
Operating input voltage range, efficiency
TA= 71°C
TA= 50°C
Vi min - Vi max
η min2
η typ
Vi min - Vi max
η min2
[W]
33.6 - 75 VDC
[%]
[%]
38.4 - 75 VDC
[%]
82
CQ1101-9G
82
82
102
CQ1001-9RG
85
-
82
-
96
120
-
-
96
-
-
99
120
-
-
-
-
99
-
-
-
106
132
-
-
-
106
Vo nom
Io nom
Io max
Vo nom
Io nom
Io max
Po nom
Po max
[VDC]
[A]
[A]
[VDC]
[A]
[A]
[W]
3.3
20
25
-
-
-
66
5.1
16
20
-
-
-
5.1
16
-
-
-
-
12
3
8
10
-
-
12 3
8
-
-
-
15 3
6.6
8
-
15 3
6.6
-
24 3
4.4
5.5
24 3
4.4
-
-
5.1
CQ2320-9RG
88
-7, P, F, B, B1, non-G
87
CQ2540-9RG
88.5
90
CQ2660-9RG
88.5
90.5
83
48Q2320-2R
85
8.5
5.1
7.5
8.5
77
97
CQ2001-9RG
85
87
4
5
12 4
4
5
96
120
CQ2320-9RG
87
88
12 4
4
-
12 4
4
-
-
96
15
4
3.3
4
15
4
3.3
4
99
120
15 4
3.3
-
15 4
3.3
-
-
99
24
4
2.2
2.7
24
4
2.2
2.7
106
132
24 4
2.2
-
24 4
2.2
-
-
106
CQ2660-9RG
88.5
88.5
-7, P, F, B, B1, non-G
85
-7, P, F, B, B1, non-G
48Q2660-2R
CQ2540-9RG
-7, P, F, B, B1, non-G
48Q2540-2R
7.5
4
-7, P, F, B, B1, non-G
48Q1001-2R
89.5
12 4
4
Options
87
-7, P, F, B, B1, non-G
-7, P, F, B, B1, non-G
48Q2320-2R
85
48Q2540-2R
85
48Q2660-2R
87
-
90
-7, P, F, B, B1, non-G
-
90
-7, P, F, B, B1, non-G
-
Table 1c: Model Selection DQ, EQ
Output 1
Output 2
Output power 1
Operating input voltage range, efficiency
Options
TA= 71°C
TA= 50°C
Vo nom
Io nom
Io max
Vo nom
Io nom
Io max
Po nom
Po max
Vi min - Vi max
η min2
η typ
Vi min - Vi max
η min2
η typ
[VDC]
[A]
[A]
[VDC]
[A]
[A]
[W]
[W]
43 - 108 VDC
[%]
[%]
66 - 150 VDC
[%]
[%]
3.3
20
25
-
-
-
66
82
DQ1101-9G
82*
5.1
16
20
-
-
-
82
102
DQ1001-9RG
85.5
85
86
12 3
8
10
-
-
-
96
120
DQ2320-9RG
15 3
6.6
8
-
-
-
99
120
DQ2540-9RG
24 3
4.4
5.5
-
-
-
106
132
5.1
EQ1101-9G
-7, B, B1, non-G
86.5
EQ1001-9RG
88
90
EQ2320-9RG
87
89
89
90.5
EQ2540-9RG
87.5
89
DQ2660-9RG
89
90
EQ2660-9RG
87.5
89
7.5
8.5
5.1
7.5
8.5
77
97
DQ2001-9RG
85
86.5
EQ2001-9RG
84
86
12 4
4
5
12 4
4
5
96
120
DQ2320-9RG
88
90
EQ2320-9RG
87
89
15 4
3.3
4
15 4
3.3
4
99
120
DQ2540-9RG
89
90.5
EQ2540-9RG
87.5
89
24
2.2
2.75
24
2.2
2.75
106
132
DQ2660-9RG
89
90
EQ2660-9RG
87.5
89
4
4
4
4
-7, P, F, B, B1, non-G
-7, B, B1, non-G
-7, P, F, B, B1, non-G
The cumulated power of both outputs cannot exceed the total power for the specified ambient temperature.
See also Output Power at Reduced Temperature.
2
Minimum efficiency at Vi nom, Io nom and TA = 25 °C
3
Double-output models with both outputs connected in parallel
4
Double-output models. The isolated output 2 is a tracking output 1.
1
NFND: Not for new designs.
Preferred for new designs
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Q Series
66 - 132 W DC-DC Converters
Part Number Description
C Q 2 5 40 -9 R B1 G
Input voltage Vi nom:
Series
24 V...................................................................... B
36 V.......................................................................G
48 V.......................................................................C
48 V (Telecom, NFND)......................................... 48
72 V.......................................................................D
110 V......................................................................E
...............................................................................Q
Number of outputs:
Single output models............................................. 1
Double output models ........................................... 2
Single output models (long case) 2........................ 6
Double output models (long case) 2....................... 7
Nominal voltage of main output:
3.3 V...................................................................... 1
5.1 V...................................................................... 0
12 V....................................................................... 3
15 V....................................................................... 5
24 V................................................................... 6, 7
Other voltages ............................................... 7, 8, 9
Other specifications and additional features
for single output models 3 ............................. 01 - 99
Nominal voltage of output 2, Vo2 nom:
5.1 V............................................................. 01 - 09
12 V.............................................................. 20 - 39
15 V.............................................................. 40 - 59
24 V.............................................................. 60 - 79
Other voltages and additional features 5....... 01 - 99
Operational ambient temperature range TA:
– 10 to 50 °C (NFND)............................................ -2
– 25 to 71 °C (option, NFND)................................ -7
– 40 to 71 °C......................................................... -9
other 3 ........................................................ -0, -5, -6
Output voltage adjust (auxiliary function).................................R
Options:
Potentiometer (option, NFND) 1............................. P
No fuse (option)..................................................... F
Additional heatsink ......................................... B, B1
RoHS-compliant for all 6 substances.......................................G
1
Option P excludes feature R and vice versa.
2
Models with 220 mm case length. Just add 5000 to the standard model number, e.g., CQ2540-9RG → CQ7540-9RG.
3
Customer-specific models.
Note: The sequence of options must follow the order above. This part number description is not intended for creating part numbers.
NFND: Not for new designs.
Preferred for new designs
Example: CQ2540-9RB1G: DC-DC converter, input voltage range 33.6 to 75 V, double-output model, each output providing
15 V/ 3.3 A, equipped with a heat sink, operating ambient temperature TA = – 40 to 71 °C, RoHS-compliant for all six substances.
Note: All models have the following auxiliary functions, which are not shown in the type designation: input and output filter, inhibit, sense lines,
current sharing, Out OK signal, LED indicators, and test sockets (not 48Q models).
Note: 48Q models are designed according to Telecom standards ETS 300132-2 and EN 41003. Vi min is 38.4 V, such limiting the input current
I i to 150% of Ii nom.
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Q Series
66 - 132 W DC-DC Converters
Product Marking
Type designation, applicable safety approval and recognition marks, CE mark, warnings, pin allocation, patents, and company logo.
Identification of LEDs, test sockets and potentiometer.
Input voltage range and input current, nominal output voltages and currents, degree of protection, batch no., serial no., and data
code including production site, version (modification status) and date of production.
Output Configuration
The Q Series design allows different output configurations to cover almost every individual requirement, by simply wiring the
outputs in parallel, series, or symmetrical configuration as per the following figures. For further information and for parallel and
series operation of several converters see Electrical Output Data.
01002a
01001a
Single-output
model
Vo+
4
Double-output
model
Vo2+
Vo+
6
Vo1+
4
28
i
S+
12
30
Vi+
S–
14
32
Vi–
Vo–
8
Vo–
10
Load
Fig. 1
Single-output configuration
6
28
i
S+
12
30
Vi+
S–
14
32
Vi–
Vo1–
8
Vo2–
10
Load
Fig. 2
Parallel-output configuration
01003a
Double-output
model
Vo2+
01004a
6
Double-output
model
Vo1+
4
Vo2–
10
S+
12
Vo1+
4
S–
14
28
i
30
Vi+
S+
12
32
Vi–
S–
14
Vo1–
Load
Load 1
28
i
30
Vi+
Vo1–
8
GND
32
Vi–
Vo2+
6
Load 2
Vo2–
10
8
Fig. 3
Series-output configuration
Vo+
Vo–
Fig. 4
Symmetrical-output configuration (with common ground)
01005a
Double-output
model
Vo1+
4
S+
12
S–
14
28 i
30
Vi+
Vo1–
8
32
Vi–
Vo2+
6
Vo2–
10
Load 1
Load 2
Fig. 5
Independent-output configuration
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Q Series
66 - 132 W DC-DC Converters
Functional Description
The converters are designed as forward converters using primary and secondary control circuits in SMD technology. The switching
frequency is approximately 200 kHz under nominal operating conditions. The built-in high-efficient input filter together with a small
input capacitance generate very low inrush currents of short duration. After transformer isolation and rectification, the output filter
reduces ripple and noise to a minimum without compromising the dynamic ability. The output voltage is fed to the secondary control
circuit via separate sense lines. The resultant error signal is sent to the primary control circuit via a signal transformer.
Double-output models have the voltage regulation of output 2 relying on the close magnetic coupling of the transformer and the output
inductor together with the circuits' symmetry.
The current limitation is located at the primary side, thus limiting the total output current in overload conditions. This allows flexible
loading of each output for unsymmetrical loads in the range 10 to 90% of the total output power. In applications with large dynamic
load changes, we recommend connecting such a load to output 1. If output 2 is not used, it should be connected parallel to output 1.
Both outputs can either be series- or parallel-connected (see Electrical Output Data).
In normal operation, the internal control circuits are powered by a third winding of the main choke (except 48 Q models). Start-up is
ensured from the input voltage by a linear regulator.
Note: When the output voltage is much lower then the nominal value, this linear regulator is activated, generating considerable power losses.
03111a
2
22 Out OK+
Primary
control circuit
i 28
Output
monitor
24 Out OK–
Output
control
18 T
16 R3
12 S+1
Vi+ 30
Vi– 32
1
1
Input
filter
Output
filter
Fuse
Cy
26
Leading pins
2
Cy
Isolation
Potentiometer for option P
3
4
Vo+
6
Vo+
8
Vo–
10
Vo–
14 S–1
20
4
Do not connect for models xQ1101 or with option P
4
Do not connect
Fig. 6
Block diagram of a single-output converter
03112a
2
22 Out OK+
Primary
control circuit
i 28
Output
monitor Vo2
24 Out OK–
Output
control
18 T
16
6
1
10 Vo2–
Input
filter
Fuse
12 S+1
26
Leading pins
2
4
Vo1+
8
Vo1–
Output
filter
Cy
Isolation
1
Vo2+
Output
filter
Vi+ 30
Vi– 32
R3
Potentiometer for option P
3
14
Cy
20
Do not connect for models with option P
4
S–1
4
Do not connect
Fig. 7
Block diagram of a double-output converter
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Q Series
66 - 132 W DC-DC Converters
Electrical Input Data
General conditions:
- TA = 25 °C, unless TC is specified.
- Sense lines connected directly at the connector, inhibit (28) connected to Vi – (32).
- R-input not connected; with option P, Vo set to Vo nom at Vi nom.
Table 2a: Input data
Model
BQ
Characteristics
Vi
Operating input voltage cont.
Conditions
min
Io = 0 – Io max,TC min – TC max
14.4
Vi nom
Nominal input voltage
Vi abs
Input voltage limits
3 s, without damage
Ii
Typical input current 1
Vi nom, I o nom
Pi 0
No-load input power
P i inh
Idle input power 4
Iinr p
Peak inrush current 2
tinr r
Rise time inrush
tinr h
Time to half value
ton
Start-up time 3
typ
GQ
max
min
36
21.6
24
0
0 → Vi min, I o nom
min
54
33.6
typ
Unit
max
75
V
48
0
4.5
Vi nom, I o nom
max
36
50
Vi min – Vi max, Io = 0
typ
CQ
63
0
3.0
100
A
2.2
2.5
3.0
2.5
1.0
1.5
1.5
W
A
55
40
35
50
40
35
130
110
80
5
5
8
ms
48Q 2
DQ
EQ
Unit
μs
Table 2b: Input data
Model
Characteristics
Conditions
min
38.4
Vi
Operating input voltage cont.
Io = 0 – Io max
Vi 2s
for ≤ 2 s, without lockout
TC min – TC max
Vi nom
Nominal input voltage
Vi abs
Input voltage limits
Ii
Typical input current
Pi 0
No-load input power
P i inh
Idle input power 4
Iinr p
Peak inrush current 2
tinr r
Rise time inrush
tinr h
Time to half value
ton
Start-up time 3
Vi nom, I o nom
0 → Vi min, I o nom
min
75
43
typ
max
min
108
66
72
2
0
100
2.2
Vi min – Vi max, Io = 0
Vi nom, I o nom
max
typ
max
150
154
48
3 s, without damage
1
typ
110
0
125
1.5
0
V
200
A
1.0
2.5
5.5
5.0
1.5
3.5
3.5
35
20
45
35
50
15
80
90
25
8
20
20
W
A
μs
ms
Typical input current depends on model type
According to ETS 300132-2
3
See fig. 19
4
Converter inhibited
1
2
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Q Series
66 - 132 W DC-DC Converters
Input Fuse
An incorporated fuse in series to the negative input line protects against severe defects. The fuse is not externally accessible.
Reverse polarity at the input will cause the fuse to blow.
Note: For models with no internal fuse, see opt. F. The customer must provide an appropriate external fuse or circuit breaker.
Model
Fuse type
BQ
very fast acting
Reference and rating
2x Littelfuse 251, 10 A, 125 V
GQ
very fast acting
2x Littelfuse 251, 7 A, 125 V
CQ
very fast acting
Littelfuse 251, 10 A, 125 V
48Q
very fast acting
Littelfuse 251, 10 A, 125 V
DQ
very fast acting
Littelfuse 251, 7 A, 125 V
EQ
very fast acting
Littelfuse 263, 5 A, 250 V
Input Transient Protection
A metal oxide VDR (Voltage Dependent Resistor) together with the input fuse and a symmetrical input filter form an effective protection
against high input transient voltages, which typically occur in most installations, especially in battery-driven mobile applications.
Nominal battery voltages in use are: 24, 36, 48, 72, 96, and 110 V. In most cases each nominal value is specified in a tolerance
band of –30% to +25%, with short excursions to ±40% or even more.
In some applications, surges according to RIA 12 are specified in addition to those defined in IEC 60571-1 or EN 50155. The power
supply must not switch off during these surges, and since their energy can practically not be absorbed, an extremely wide input
voltage range is required. The Q Series input ranges have been designed and tested to meet most of these requirements. See
also Electromagnetic Immunity.
Input Under-/Overvoltage Lockout
If the input voltage falls outside the limits of Vi, an internally generated inhibit signal disables the output(s).
Inrush Current
The inherent inrush current value is lower than specified in the standard ETS 300132-2. The converters operate with relatively
small input capacitance C i (see table 4), resulting in low inrush current of short duration. As a result, in a power-bus system the
converters can be hot-swapped, causing negligible disturbances.
Input Stability with Long Supply Lines
If a converter is connected to the power source by long supply lines exhibiting a considerable inductance Lext, an additional external
capacitor Cext connected across the input pins improves the stability and prevents oscillations.
Actually, a Q Series converter with its load acts as negative resistor r i, because the input current I i rises, when the input voltage Vi
decreases. It tends to oscillate with a resonant frequency determined by the line inductance L ex t and the input capacitance Ci + Cext,
damped by the resistor R ext. The whole system is not linear at all and eludes a simple calculation. One basic condition is given by
the formula:
Lext • Po max dVi
___
Ci + Cext > _________ ( ri =
)
Rext • Vi min²
dIi
Rext is the series resistor of the voltage source including the supply lines. If this condition is not fulfilled, the converter may not reach
stable operating conditions. Worst case conditions are at lowest Vi and at highest output power Po.
Low inductance L ext of the supply lines and an additional capacitor Cext are helpful. Recommended values for Cext are given in table 4,
which should allow for stable operation up to an input inductance of 2 mH. Ci is specified in table 4.
Table 4: C i and recommended values for Cext
JM001c
Rext
Vi+
+
Ri
Ci
Vi–
Fig. 8
Input configuration
Vo+
Load
Lext
Converter
Vo–
Model
Ci
Recomm. Cext
Voltage
BQ
220 μF
≥ 680 μF
40 V
GQ
110 μF
≥ 470 μF
63 V
CQ
50 μF
≥ 470 μF
100 V
48Q
50 μF
≥ 470 μF
100 V
DQ
22 μF
≥ 150 μF
125 V
EQ
11 μF
≥ 68 μF
200 V
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Q Series
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Electrical Output Data
General conditions:
- TA = 25 °C, unless TC is specified.
- Sense lines connected directly at the connector, inhibit (28) connected to Vi – (32).
- R input not connected; with option P, Vo set to Vo nom at Vi nom.
Table 5a: Output data for single-output models and double-output models with both outputs in parallel configuration
Model
BQ – GQ1101
48Q / BQ – GQ1001
48Q / BQ – GQ2320
Output
3.3 V
5.1 V
12 V
Characteristics
Conditions
min
typ
max
min
typ
max
min
typ
max
V o1
Setting voltage of 1 output
Vi nom, Io nom
3.28
3.32
5.07
5.13
11.94
12.06
V ow
Worst case output voltage
3.24
3.35
5.02
5.18
11.82
12.18
Vo P
Overvoltage limitation
of second control loop
Vi min – Vi max
TC min – TC max,
Io = 0 – Io max
4.5
4.9
5.9
6.4
13.5
14.3
Io
Output current 2
0.05
25
0
16/20 3
0
8.0/10 3
Io nom
Nominal output current
Io L
Output current limit 2
32.5
16.8/21 3
vo 4
Output
noise
Po max
Output power 1
vo d 4
Dynamic
load
regulation
td
4, 5
st
Switch. frequency
Total incl. spikes
Voltage deviation
Recovery time
vo os
Dynamic line regulation
(output overshoot)
vo tr
Output
voltage trim
range
α vo
via R-input 1
using opt. P 1
Temperature coefficient of Vo
Vi min – Vi max
TC min – TC max
20
26
16
Unit
V
A
8.0
20.8/26 3
8.4/10.5 3
10.4/12.5 3
Vi nom, Io nom
15
25
10
20
10
20
BW = 20 MHz
25
50
20
50
20
40
Vi min – Vi max
TC min – TC max
82
82/102 3
96/120 3
W
±300
±250
±200
mV
800
800
1500
μs
Vi nom
Io nom ↔ ½ Io nom
0 ↔ Vi max
0 – Io max
1.1•Vi min – Vi max
0.5
0.5
0.8
N/A
4.0
5.6
7.2
13.2
TC min – TC max
N/A
4.6
5.6
10.8
13.2
Io nom,
TC min – TC max
±0.02
0.1• Io nom – Io nom
±0.02
mVpp
±0.02
V
%/K
If the output voltage is increased above Vo nom through R-input control, option P setting, or remote sensing, the output power should be
reduced accordingly, so that Po max and TC max are not exceeded.
2
See Output Power at Reduced Temperature.
3
First value for 48Q, 2nd value for BQ – GQ
4
Measured with a probe according to IEC/EN 61204, annex A
5
Recovery time see Dynamic load regulation.
1
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Table 5b: Output data for double-output models with both outputs in parallel configuration. General conditions as per table 5a
Model
48Q / BQ – GQ2540
48Q / BQ – GQ2660
Output
15 V
24 V
Characteristics
Conditions
V o1
Setting voltage of 1 output
V ow
Worst case output voltage
Vo P
Overvoltage limitation
of second control loop
Io
Output current 2
Io nom
Nominal output current
Io L
Output current limit
st
2
Switch. frequency
max
23.88
24.12
Vi min – Vi max
TC min – TC max,
Io = 0 – Io max
15.23
23.64
24.36
17
18
27.5
29
0
6.6/8.0 3
0
4.4/5.5 3
Vi min – Vi max
TC min – TC max
6.6
6.9/8.4
3
4.6/5.8
A
6.2/8.0
3
Vi nom, Io nom
10
20
10
25
BW = 20 MHz
20
40
20
40
vo d 4
t d 4, 5
Dynamic
load
regulation
vo os
Dynamic line regulation
(output overshoot)
0 ↔ Vi max
0 – Io max
Output
voltage trim
range
via R-input
1.1•Vi min – Vi max
vo tr
using opt. P 1
TC min – TC max
Vi nom
Io nom ↔ ½ Io nom
0.1• Io nom – Io nom
Io nom,
TC min – TC max
V
4.4
8.6/10.4
3
Vi min – Vi max
TC min – TC max
Temperature coefficient of Vo
typ
15.08
Output power 1
α vo
min
14.78
Po max
Recovery time
max
14.93
Output
noise
Voltage deviation
typ
Vi nom, Io nom
vo 4
Total incl. spikes
min
Unit
3
mVpp
99/120 3
106/132 3
W
±200
±600
mV
1500
800
μs
0.8
1.2
9.0
16.5
14.4 6
26.4
13.5
16.5
21.6
26.4
±0.02
±0.02
V
%/K
If the output voltages are increased above Vo nom through R-input control, option P setting or remote sensing, the output power should be
reduced accordingly so that Po max and TC max are not exceeded.
2
See Output Power at Reduced Temperature.
3
First value for 48Q, 2nd value for BQ – GQ
4
Measured with a probe according to IEC/EN 61204, annex A
5
Recovery time until Vo remains within ±1% of Vo, see Dynamic load regulation.
6
For DQ2660 and EQ2660: 16.8 V
1
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Table 6a: Output data for double-output models with output 1 and output 2 in symmetrical or independent configuration.
General conditions as per table 5a.
Model
48Q /BQ – GQ2320
Output
12 V / 12 V
Characteristics
Conditions
Output 1
max
min
Output setting voltage 1
Vi nom, Io nom
11.94
min
12.06
11.88
V ow
Worst case output voltage
11.82
12.18
Vo P
Overvoltage limitation
of second control loop
Vi min – Vi max
TC min – TC max,
Io = 0 – Io max
Io
Output current 2
Io nom
Nominal output current
Io L
Output current limit
Switch. frequency
vo 4
Output
noise
Po max
Output power total 1
vo d 4
Dynamic
load
regulation
vo tr
α vo
Output
voltage trim
range
2
Total incl. spikes
Voltage deviation
Vi min – Vi max
TC min – TC max
N/A
0.8
max
min
max
min
14.93
15.08
14.85
14.78
15.23
15
0.8
4.0
typ
N/A
7.2/9.2 3
0.6
10.4/13
6.9/8.4
max
15.15
see Output
Voltage Regulation
6.0/7.4 3
A
3.3
8.6/10.4
3
Vi nom, Io nom
16
8
16
8
16
8
16
BW = 20 MHz
16
40
16
40
16
40
16
40
Vi min – Vi max
TC min – TC max
Recovery time
via R-input
1.1•Vi min – Vi max
using opt. P
TC min – TC max
0.1• Io nom – Io nom
Io nom,
TC min – TC max
96 / 120 3
±200
±200
1500
13.2
10.8
13.2
±0.02
see Output
Voltage Regulation
μs
9.0
16.5
13.5
16.5
±0.02
±0.02
mVpp
mV
±300
1500
7.2
3
W
99 / 120 3
±300
V
19
0.6
3.3
3
typ
17
6.0/7.4 3
4.0
3
Output 2
12.12
see Output
Voltage Regulation
13.5
7.2/9.2 3
8.4/10.5
typ
Output 1
8
Vi nom
Io nom ↔ ½ Io nom
Io 2 = ½ Io nom
Temperature coefficient of Vo
typ
Unit
15 V / 15 V
Output 2
Vo
t d 4, 5
48Q /BQ – GQ2540
see Output
Voltage Regulation
V
±0.02
%/K
If the output voltages are increased above Vo nom through R-input control, option P setting, or remote sensing, the output power should be
reduced accordingly so that Po max and TC max are not exceeded.
2
See Output Power at Reduced Temperature.
3
First value for 48Q, 2nd value for BQ – GQ
4
Measured with a probe according to IEC/EN 61204, annex A
5
Recovery time until Vo remains within ±1% of Vo, see Dynamic load regulation.
6
Io nom = Io1 + Io2
1
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Q Series
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Table 6b: Output data for double-output models with output 1 and output 2 in symmetrical or independent configuration.
General conditions as per table 5a
Model
48Q2660
Output
24 V / 24 V
Characteristics
Conditions
Output 1
max
min
Output setting voltage 1
Vi nom, Io nom
23.88
min
24.12
23.76
V ow
Worst case output voltage
23.64
24.36
Vo P
Overvoltage limitation
of second control loop
Vi min – Vi max
TC min – TC max,
Io = 0 – Io max
Io
Output current 2
Io nom
Nominal output current
Io L
Output current limit 2
vo 4
Output
noise
Po max
Output power total 1
vo d 4
Dynamic
load
regulation
td
vo tr
α vo
Output
voltage trim
range
Switch. frequency
Total incl. spikes
Voltage deviation
Vi min – Vi max
TC min – TC max
0.4
max
min
max
min
24.24
23.88
24.12
23.76
23.64
24.36
see Output
Voltage Regulation
27.5
30
0.4
4.0
0.4
6.2
5.8
4.0
2.2
N/A
2.2
4.6
typ
Output 2
typ
max
24.24
see Output
Voltage Regulation
27.5
30
0.4
5.1
5.1
2.2
A
8.0
25
10
25
10
25
10
25
BW = 20 MHz
20
40
20
40
20
40
20
40
Vi min – Vi max
TC min – TC max
via R-input
1.1•Vi min – Vi max
0.1• Io nom – Io nom
106
±400
±500
TC min – TC max
Io nom,
TC min – TC max
±0.02
W
±400
±500
mV
μs
400
26.4
N/A
mVpp
132
400
14.4
V
2.2
10
Recovery time
Temperature coefficient of Vo
N/A
typ
Output 1
Vi nom, Io nom
Vi nom
Io nom ↔ ½ Io nom
Io 2 = ½ Io nom
using opt. P
typ
Unit
24 V / 24 V
Output 2
Vo
4, 5
BQ – GQ2660
see Output
Voltage Regulation
14.4 3
26.4
21.6
26.4
±0.02
±0.02
see Output
Voltage Regulation
V
±0.02
%/K
If the output voltages are increased above Vo nom through R-input control, option P setting or remote sensing, the output power should be
reduced accordingly so that Po max and TC max are not exceeded.
2
See: Output Power at Reduced Temperature
3
For DQ2660 and EQ2660: 16.8 V
4
Measured with a probe according to IEC/EN 61204, annex A
5
Recovery time until Vo remains within ±1% of Vo, see Dynamic load regulation
1
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Q Series
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Parallel and Series Connection
Single- or double-output models with equal output voltage can be connected in parallel without any precaution, by interconnecting
the T-pins for equal current sharing; see fig. 9a.
Double-output models with their outputs connected in parallel behave exactly like single-output models and are fully regulated.
There is no inconvenience or restriction using the R-input with sense lines.
Single-output and/or double-output models can be connected in series. For double-output models with both outputs connected in
series, consider that the effect via sense lines, R-input or option P is doubled. See fig. 9b.
Parallel configuration of double-output models with both outputs connected in series is shown in fig. 9c. It is essential that the
Vo1– pins of all paralleled converters are connected together, as the auxiliary signals are referenced to Vo1– or to S–. The effect
via sense lines, R-input or option P is doubled.
+
05091b
T
Rp
S+
Out OK –
Vo2–
S–
i
Vo1+
i
Vo–/Vo1–
Vi+
S+
Vi+
Vo+/Vo2+
Vi–
S–
Vi–
Vo–/Vo2–
Vo1–
DR
S+
Out OK–
S–
Load
Out OK+
Out OK+
Vo2+
Out OK –
Vo2–
i
Vo1+
i
Vo–/Vo1–
Vi+
S+
Vi+
Vo+/Vo2+
Vi–
S–
Vi–
Vo–/Vo2–
+
Fig. 9a
Parallel connection of single- and double-output models.
+
Vo1–
–i
Fig. 9b
Series connection of double-output models.
06114a
Double
output
T
Vo2+
Out OK+
Vo2–
Out OK –
Vo1+
i
S+
Vi+
S–
Vi–
Vo1–
R
Double
output
–i
T
Vo2+
Out OK+
Vo2–
Out OK –
Vo1+
i
S+
Vi+
S–
Vi–
Vo1–
Load
Rp
+
Vo2+
Out OK–
Vo+/Vo1+
–i
Out OK+
Out OK+
T
+
Rp
DR
Vo+/Vo1+
05092a
Load
+
Notes:
• If the second output of double-output models is not used,
connect it in parallel to the main output to maintain good
regulation.
• Parallel connection of several double-output models should
always include main and second outputs to produce good
regulation.
• Series connection of second outputs without involving their
main outputs should be avoided as regulation may be poor.
• The maximum output current is limited by the output with the
lowest current limit, if several outputs are connected in series.
• Rated output voltages above 48 V (ES1 = Energy Source
class 1) need additional measures in order to comply with
international safety requirements.
R
Fig. 9c
Parallel connection of double-output models with series-connected outputs.
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Q Series
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Redundant Configuration
Fig. 10a shows a circuit with ORing diodes DR in the positive output lines, forming a redundant configuration. For accurate output
voltage regulation, the sense lines are connected after the ORing diodes. The T pins should be connected together to produce
reasonable current sharing between the parallel-connected converters.
If one of the converters fails, the remaining converters can deliver the whole output power.
Note: The current-share logic can only increase the output voltage marginally and remains functional even in the case of a failing converter.
Fig. 10b shows a quite similar circuit with ORing diodes DR, but with different output loads. To compensate for the voltage drop of the
ORing diodes (if necessary), an auxiliary circuit is added to each power supply consisting of a small diode DS and a small resistor RS.
We recommend a current of approximately 10 mA through DS and RS. Only Load 0 benefits from a secured supply voltage.
The current sharing may be improved by interconnecting the T pins of the converters. This circuit is a bit less accurate, but more
flexible and less sensitive.
Caution: Do not connect the sense lines after the ORing diodes, but directly with the respective outputs. If for some reason one of the
converters switches off and the ORing diode is blocking, a reverse voltage can appear between the sense pin and the respective output pin
and damage the converter.
Out OK+
S+
Out OK–
S–
Out OK–
S–
i
Vo–/Vo1–
i
Vo–/Vo1–
Vi+
Vo+/Vo2+
Vi+
Vo+/Vo2+
Vi–
Vo–/Vo2–
Vi–
Vo–/Vo2–
S+
Out OK–
S–
DS
RS
T
DR
Vo+/Vo1+
Load
Out OK+
DR
Vo+/Vo1+
S+
T
i
T
Rp
Out OK+
Vo+/Vo1+
+
DR
Out OK+
S+
Out OK–
S–
i
Vo–/Vo1–
i
Vo–/Vo1–
Vi+
Vo+/Vo2+
Vi+
Vo+/Vo2+
Vi–
Vo–/Vo2–
Vi–
Vo–/Vo2–
–
Fig. 10a
Simple redundant configuration of double-output models
with parallel-connected outputs.
+
i
DR
DS
RS
Load 0
Vo+/Vo1+
06097b
Load 1
T
Rp
–
+
05091b
Load 2
+
Fig. 10b
Redundant configuration of double-output models with parallel-connected outputs.
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Q Series
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Output Voltage Regulation
The dynamic load regulation is shown in figure 11.
The static load regulation measured at the sense pins is negligible. Correct connection of the sense lines almost eliminates any
load regulation; see Sense Lines.
In a symmetrical configuration the output 1 with open R input is regulated to Vo1 nom, regardless of the output currents. If the load
on output 2 is too small ( Io max) both output voltages are reduced simultaneously.
Current distribution in overload is dependent upon the type of overload. A short-circuit in one output will cause the full current flow
into that output, whereas a resistive overload results in more even distribution and in a reduced output voltage.
Vo/Vo nom
Operation at reduced
temperature only
Io nom Io max Io L
0.5
Io nom Io L
05104b
1.0
0.8
Out of specs.
1.0
0.95
05114c
Out of specs.
Vo/Vo nom
0.6
0.4
0.2
Io
0
Fig. 15a
BQ – GQ models: Current limitation of single- or double-output
models with series-connected outputs (no opt. B or B1)
0
0.2
0
0.4
0.6
0.8
1.0
1.2
1.4
Io/Io nom
Fig. 15b
48Q models: Current limitation of single- or double-output
models with series-connected outputs (no opt. B or B1)
Efficiency
η [%]
90
η [%]
90
JM082
Vi nom
Vi min
85
Vi min
85
Vi max
Vi max
80
80
75
JM083
Vi nom
1
2
3
4
Fig. 16a
Efficiency versus input voltage and current per output
(BQ2320)
5
Io [A]
75
1
3
2
5
4
Io [A]
Fig. 16b
Efficiency versus input voltage and current per output
(EQ2320)
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Q Series
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Hold-up Time
The Q Series converters provide virtually no hold-up time. If hold-up time or interruption time is required, use external output
capacitors or decoupling diodes together with input capacitors of adequate size.
Formula for additional external input capacitor:
2 • Po • t h • 100
C = –––––––––––––––
i ext
η • (Vti 2 – V i min2)
where as:
C i ext =
Po
=
η
=
t h
=
Vi min =
Vt i
=
external input capacitance [mF]
output power [W]
efficiency [%]
hold-up time [ms]
minimum input voltage [V]
threshold level [V]
Thermal Considerations and Protection
If a converter is located upright in quasi-stationary air (convection cooling) at the indicated maximum ambient temperature TA max (see
table Temperature specifications), and is operated at its nominal input voltage and output power, the temperature TC measured at the
Measuring point of case temperature (see Mechanical Data) will approach TC max after the warm-up phase. However, the relationship
between TA and TC depends heavily on the operating conditions and the integration into a system. The thermal conditions are
influenced by input voltage, output current, airflow, and temperature of surrounding components and surfaces. TA max is therefore,
contrary to TC max, an indicative value only.
Caution: The installer must ensure that under all operating conditions TC remains within the limits stated in the table Temperature specifications.
Note: Sufficient forced cooling or an additional heat sink improves the reliability or allows TA to be higher than TA max, as long as TC max is not
exceeded. In rack systems without proper thermal management, the converters must not be packed too densely! In such cases the use of a
5 or 6 TE front panel is recommended.
A temperature sensor generates an internal inhibit signal, which disables the outputs, if the case temperature exceeds TC max. The
outputs are automatically re-enabled when the temperature drops below this limit. This feature is not fitted to 48Q models.
Operating BQ – GQ models with output current beyond Io nom requires a reduction of the ambient temperature TA to 50 °C or forced
cooling. When TC max is exceeded, the converter runs into its thermal protection and switches off; see fig. 17a.
Note: According to EN 50155, Class OT4, the converters BQ – GQ can be operated with Po nom continously at TA = 70 °C, and then for 10 min
at TA = 85 °C without shutdown.
Fig. 17b shows the operation of 48Q models beyond TA = 50 °C with forced cooling.
Po
Po max
05116b
forced
cooling
Po
05110b
Po nom
Po nom
0.75 Po nom
convection
cooling
TA min 50
forced
cooling
convection
cooling
60
70
TC max
80
90
TA
100 °C
Fig. 17a
Output power derating versus TA for BQ – GQ models
TC max
0.4 Po nom
–10
30
40
50
60
70
80 °C
TA
Fig. 17b
Output power derating versus TA for 48Q models
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Q Series
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Auxiliary Functions
Inhibit for Remote On/Off
Note: If this function is not used, the inhibit pin 28 must be connected with pin 32 to enable the output(s). A non-connected pin 28 will be
interpreted by the internal logic as an active inhibit signal and the output(s) will remain disabled (fail safe function).
An inhibit input enables (logic low, pull down) or disables (logic high, pull up) the output, if a logic signal, e.g. TTL, CMOS is
applied. In systems consisting of several converters, this feature may be used, for example, to control the activation sequence of
the converters by means of logic signals, or to allow the power source for a proper start-up, before full load is applied.
Table 7: Inhibit characteristics
Characteristics
V inh
Inhibit voltage
Iinh
Inhibit current
V o = on
V o = off
Conditions
min
Vi min – Vi max
TC min – TC max
-50
typ
0.8
2.4
50
V inh = -50 V
V inh = 0 V
V inh = 50 V
max
-500
-40
+500
Unit
V
µA
The output response, when enabling and disabling the output by the inhibit input, is shown in figure 19.
Vo /Vo nom
06091a
28
S+
i
Vinh
Ii
30
Vi+
Vi
32
Vi–
26
12
Vo+
4
Vo+
6
Vo–
8
Vo–
10
S–
14
Io
Vo
Load
Iinh
0.1
0
Vi min
0
06159b
tf
tr
1.01
0.99
t
ton
Vi
t
Vinh [V]
2.4
0.8
Fig. 18
Definition of input and output parameters
t
Fig. 19
Output response as a function of Vi (on/off switching) or
inhibit control
Table 8: Inhibit response times (typ. values, outputs with ohmic load, R-input left open-circuit)
Characteristics
tr
tr
Vi min
Conditions
BQ
48Q
CQ
GQ
DQ*
EQ*
Unit
Output voltage rise time
(indicative values)
Vi nom, RL = Vo nom / Io nom
V inh = 2.4 → 0.8 V
1.5
1.3
1.3
1.5
1.5
1.6
V
Output voltage fall time
(indicative values)
Vi nom, RL = Vo nom / Io nom
V inh = 0.8 → 2.4 V
0.5
0.8
1.3
3
0.5
0.6
1.2
3
0.5
0.6
1.3
3
0.5
0.8
1.5
3
0.5
0.7
1.1
3
0.5
0.7
1.5
3
µA
3.3 V
5V
12 / 15 V
24 V
* Models with version V104 or higher
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Q Series
66 - 132 W DC-DC Converters
Current Sharing
The current sharing facility should be used when several converters are operated in parallel or redundant connection. This feature
avoids that some converters are driven into current limitation and thus produce excessive losses. As a result, the stress of the
converters is reduced, and the system reliability is further improved.
Simple interconnection of the T pins causes the converters to share the output current. The current tolerance of each converter is
approx. ±20% of the sum of its nominal output currents Io1 nom + Io2 nom.
In n+1 redundant systems, a failure of a single converter will not lead to a system failure, if the outputs are decoupled by diodes;
see fig. 10.
Note: T-function only increases the output voltage, until the currents are evenly shared. If in a redundant system, one converter fails, the
remaining converters keep sharing their currents evenly.
Since the T pins are referenced to the pins S –, the S– pins of all converters must have the same electrical potential.
Double-output converters with both outputs connected in series can also be paralleled with current sharing, if pins Vo1– of all
converters are connected together, see fig. 9c.
If the output voltages are programmed to a voltage other than Vo nom by means of the R pin or option P, the outputs should be
adjusted individually within a tolerance of ±1%.
Important: For applications using the hot-swap capabilities, dynamic output voltage changes during plug-in/plug-out must be considered.
Programmable Output Voltage (R-Function)
This feature is not available on models with 3.3 V output or with option P.
Note: Models with 3.3 V output or with option P: The R-input must be left open-circuit.
The converters offer a programmable output voltage. The adjust is performed either by an external control voltage Vext or an
external resistor R1 or R2, connected to the R-input. Trimming is limited to the values given in the table below (see also Electrical
Output Data). With open R-input, the output voltage is set to Vo nom.
With double-output models, both outputs are affected by the R-input settings.
If output voltages are set higher than Vo nom, the output currents should be reduced accordingly, so that the maximum specified
output power is not exceeded.
a) Adjustment by means of an external control voltage Vext between R (pin 16) and S– (pin 14); see fig. 20.
Vo
Vext
Vext ≈ 2.5 V • –––––––
Vo ≈ Vo nom • –––––
Vo nom
2.5 V
Caution: To prevent damage, Vext should not exceed 20 V, nor be negative.
b) Adjustment by means of an external resistor:
The resistor can either be connected:
• between R (pin 16) and S – (pin 14) to set Vo < Vo nom, or
• between R (pin 16) and S+ (pin 12) to set Vo > Vo nom.
06093b
Doubleoutput
model
R 16
06094b
Single-output
model
Vo1+ 4
S+ 12
i
Vext
+ –
S– 14
Load 1
R 16
Vo+ 4
Vo+ 6
i
S+ 12
Vi+
Vo1– 8
Vi+
S– 14
Vi–
Vo2+ 6
Vi–
Vo– 8
Vo2– 10
Load 2
Fig. 20
Output adjust using an external control voltage Vext.
R2
R1
Load
Vo– 10
Fig. 21
Output adjust using a resistor R1 (to lower Vo) or
R2 (to increase Vo).
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Q Series
66 - 132 W DC-DC Converters
Table 9a: R1 for Vo < Vo nom; approximate values (Vi nom, Io nom, series E 96 resistors); R2 = not fitted
Vo nom = 5.1 V
Vo [V]
R 1 [kΩ]
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
14.7
16.5
18.2
21.5
25.5
30.1
37.4
47.5
64.9
97.6
200
Vo nom = 12 V
Vo [V] 1
Vo nom = 15 V
R 1 [kΩ]
Vo [V] 1
Vo nom = 24 V
R 1 [kΩ]
Vo [V] 1
15
16 2
17 2
18 2
19
20
20.5
21
21.5
22
22.5
23
23.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
14
15
16
17
18
19
20
21
22
23
9
9.5
10
10.5
11
11.5
12
12.5
13
13.5
14
14.5
5.62
6.65
8.06
9.76
12.1
15.4
20
28
44.2
93.1
18
19
20
21
22
23
24
25
26
27
28
29
6.04
6.98
8.06
9.31
11
13.3
16.2
20
26.1
36.5
56.2
115
R 1 [kΩ]
30.0
32.0 2
34.0 2
36.0 2
38.0
40.0
41.0
42.0
43.0
44.0
45.0
46.0
47.0
2
6.65 2
8.06 2
9.76 2
12.1
15.4
20.0
23.7
28.0
34.8
44.2
60.4
90.9
190
2
Table 9b: R2 for Vo > Vo nom; approximate values (Vi nom, Io nom, series E 96 resistors); R1 = not fitted
Vo nom = 5.1 V
Vo [V]
R 2 [kΩ]
5.2
5.3
5.4
5.5
5.6
215
110
75
57.6
46.4
1
2
Vo nom = 12 V
Vo [V] 1
12.2
12.4
12.6
12.8
13.0
13.2
Vo nom = 15 V
R 2 [kΩ]
24.4
24.8
25.2
25.6
26.0
26.4
Vo [V] 1
931
475
316
243
196
169
15.3
15.5
15.7
16.0
16.2
16.5
Vo nom = 24 V
R 2 [kΩ]
30.6
31
31.4
32
32.4
33
Vo [V] 1
1020
619
453
316
267
221
24.5
25
25.5
26
26.4
R 2 [kΩ]
49
50
51
52
52.8
1690
866
590
442
374
First column: single or double output models with separated/paralleled outputs, second column: outputs in series connection.
Not possible for DQ2660 and EQ2660.
Output Good Signal (Out-OK)
The isolated Out-OK output gives a status indication of the converter and the output voltage. It can be used for control functions
such as data protection, central system monitoring or as a part of a self-testing system. It can be connected to get a centralized
fault detection or may be used for other system-specific applications at the primary or the secondary side of the converter.
Connecting the Out-OK as per fig. 22, VOK 300 2
>100
>300 2
>300 2
Insulation resistance
Minimum creepage distances
*
1
2
3
1.4
MΩ
1.4
3
mm
Models with version V104 or higher. Older converters have only been tested with 0.3 kVDC.
Subassemblies connecting input to output are pre-tested with 3 kVAC or 4.2 kVDC.
Tested at 500 VDC.
2.8 mm between input and output.
Safety of Operator-Accessible Output Circuits
If the output circuit of a DC-DC converter is operator-accessible, it shall be an ES1 circuit according to IEC 62368-1.
Table 20 shows some possible installation configurations, compliance with which causes the output circuit of the DC-DC converter
to be ES1 up to a configured output voltage (sum of nominal voltages, if in series configuration) of 35 V.
However, it is the sole responsibility of the installer to ensure the compliance with the relevant and applicable safety regulations.
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Q Series
66 - 132 W DC-DC Converters
Description of Options
Option P: Output Voltage Adjustment
Option P provides a built-in multi-turn potentiometer, which allows an output voltage adjustment of ±10% of Vo nom. The potentiometer
is accessible through a hole in the front cover.
With double-output models, both outputs are affected by the potentiometer. If converters are parallel-connected, their individual
output voltage should be set within a tolerance of ±1%.
If Vo is set higher than Vo nom, the output currents should be reduced accordingly, so that the maximum specified output power is
not exceeded.
Option -7: Temperature Range
Option -7 designates converters with an operational ambient temperature range of – 25 to 71 °C. Not for new designs.
Option B, B1: Additional Heat Sink
Thickness: 12.5 mm (opt. B) or 20 mm (opt. B1)
Table 19: Thermal resistance case to ambient (approx. values)
Case
Thermal resistance
Thickness of case
Standard (160 mm long)
1.60 K/W
< 20 mm
Case 220 mm long
1.40 K/W
< 20 mm
Option B
1.45 K/W
< 33 mm
Option B1
1.40 K/W
< 40 mm
1, 2
As well available with an additional heat sink
2
Customer-specific models. Add 5000 to the part number!
1
Option F:
No internal fuse; the installer must use an appropriate external fuse or circuit breaker. CSA, NEMKO symbol on request.
Option non-G:
Leaded solder used (not RoHS-compliant).
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Q Series
66 - 132 W DC-DC Converters
Table 20: Safety concept leading to an ES1 output circuit
Conditions
Front end
Nominal supply
voltage
Minimum required grade of
insulation, to be provided by
the AC-DC front end, including
mains supplied battery charger
Maximum
DC output
voltage from
the front end 1
Mains ≤150 VAC
Functional (i.e. there is no need
for electrical insulation between
the mains supply circuit and the
DC-DC converter input voltage)
Basic
Mains ≤ 250 VAC
DC-DC converter
Result
Minimum required safety
status of the front end
output circuit
Types
Measures required to achieve
the specified safety status of the
output circuit
Safety status
of the DC-DC
converter
output circuit
≤ 150 V 2
Primary circuit
DQ
EQ
Double or reinforced insulation,
based on 150 VAC and DC
(provided by the converter) and
earthed case 3
ES1 circuit
≤ 60 V
ELV circuit
BQ, GQ
48Q, CQ
Supplementary insulation,
based on 150 VAC (provided by
the DC-DC converter) and earthed
case 3
≤ 75V
Hazardous voltage
secondary circuit
48Q
CQ
Supplementary insulation, based
on 150 VAC and double or
reinforced insulation 4
(both provided by the DC-DC
converter) and earthed case 3
≤ 60 V
Earthed ES1 circuit 3
BQ
GQ
48Q
CQ
Functional insulation
(provided by the converter)
ELV circuit
Double or reinforced
≤ 75V
Unearthed hazardous
voltage secondary circuit
48Q
CQ
Input fuse 5, output suppressor
diodes 6, earthed output circuit 3 and
earthed 3 or non-user-accessible
case
≤ 150 V
Earthed hazardous
voltage secondary circuit 3
or earthed ELV circuit
BQ, GQ
48Q, CQ
DQ, EQ
Double or reinforced insulation 4,
(provided by the converter) and
earthed case 3
Unearthed hazardous
voltage secondary circuit
DQ
EQ
Supplementary insulation, based
on 250 VAC and double or
reinforced insulation 4
(both provided by the converter)
and earthed case 3
≤ 60 V
ES1 circuit
BQ, GQ
48Q, CQ
Functional insulation
(provided by the converter)
≤ 120 V
TNV-3 circuit
≤ 150 V
Double or reinforced
insulated unearthed
hazardous voltage
secondary circuit 2
48Q, CQ
DQ, EQ
Basic insulation 4
(provided by the DC-DC converter)
Earthed ES1
circuit
ES1 circuit
The front end output voltage should match the specified input voltage range of the DC-DC converter.
Has to be insulated from earth according to IEC/EN 62368-1, by at least supplementary insulation, based on the maximum nominal output
voltage from the front end.
3
The earth connection has to be provided by the installer according to IEC/EN 62368-1.
4
Based on the maximum rated output voltage provided by the front end.
5
The installer shall provide an approved fuse with the lowest rating suitable for the application in a non-earthed input conductor directly at
the input of the DC-DC converter (see fig. Schematic safety concept). For UL’s purposes, the fuse needs to be UL-listed.
6
Each suppressor diode should be dimensioned such that in the case of an insulation fault the diode is able to limit the output voltage to
ES1 (
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