Release 0.A
P/N 7V7820WC000
HEHB 40A-48V-5V
48 V
in
4 0A
out
5 V
out
High Efficie nc y, Is ola ted Ha lf
Brick DC-DC Conv e rte r
Fe a tur e
s
Fe a t r e
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Very high efficiency: 92%@20A, 91%@40A
(48Vin, 25°C, 300LFM)
Wide input voltage range (36 to 75Vdc)
Total weight: 63g. (2.22oz.) Open-Frame Version;
Max 85g. (2.99oz.) Metal-Plate Version
Low profile, industry standard footprint and pinout:
2.3" x 2.4" x 0.4" (58.4mm x 61.0mm x 10.2mm)
Adjustable output voltage (+10% / -20% )
Input to Output Isolation at 2000Vdc, 10M
Ω
Fixed Frequency (300 KHz)
Undervoltage Lockout (UVLO)
Overcurrent protection
Overtemperature protection
Auto-restart after overcurrent shutdown
Remote sense
Remote ON/OFF
Operating temperature -40/+100°C
ISO 9001 Certified manufacturing processes
CSA/US, CSA, Kema Certified
P r od uc t Hi
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g hts
P r od uc t H g h g hts
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The HEHB DC-DC Converter family is
Magnetek’s solution for next generation,
cutting-edge board applications.
The synchronous rectification topology uses
MOSFET instead of Schottky diodes
providing extreme reduction in heat
generation, boosting efficiency, eliminating
the need for a heat sink and increasing
reliability.
The low profile (0.4”), open frame
construction allows smaller card pitch and
improves ventilation.
The fixed switching frequency provides
predictable EMI characteristics.
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P/N 7V7820WC000
HEHB 40A 48V 5V DS 7V78 – page
1
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HEHB40A - 48V – 5V High Efficiency DC-DC Converter
Mechani
i
cal
l
Drawi
i
ngs
Mechan ca Draw ngs
- All dimensions are in inches (mm)
-
Tolerances: x.xx in. +/-0.2 in. (0.5mm)
-
Pins 1-4, 6-8 are 0.040" (1.02mm) dia. with 0.080" (2.03mm) dia. standoff shoulders
OPEN-FRAME VERSION
METAL-PLATE VERSION
PINOUT Description
Pin
Name
Function
1
Vin (-)
Return terminal for the -48V input bus
2
Not Present
3
ON/OFF
Logic signal referenced to Vin (-), TTL compatible
(internal pull up ) to turn converter on and off
4
Vin (+)
Positive terminal for the +48V input bus
5
Vout (+)
Positive terminal for output voltage
6
Sense (+)
Positive remote sense
7
TRIM
Output voltage TRIM
8
Sense (-)
Negative remote sense
9
Vout (-)
Return terminal for output voltage
P/N 7V7820WC000
HEHB 40A 48V 5V DS 7V78 – page
2-
HEHB40A - 48V – 5V High Efficiency DC-DC Converter
Speci
i
fi
i
cati
io
ns
Spec cat
o
ns
(Typical values are at nominal input line, full load, airflow 300 LFM, 25°C ambient temperature unless otherwise specified)
Input
characteristics
Operating Input Voltage Range
Input Surge Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current (I
INmax
)
No-load Input Current
Off Converter Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
Output
characteristics
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak to Peak
RMS
Operating Output Current Range
Output DC Current Limit Inception
Output DC Current Limit Shutdown
Voltage
Admissible Output Capacitance
Dynamic
characteristics
Output Voltage Current Transient
Positive Step Change in I
OUT
Negative Step Change in I
OUT
Settling Time to 1%
Turn On Transient
Turn On Time
Output Voltage Overshoot
Notes &
Conditions
Note 1
T< 10µs
Min
36
Typ
48
Max
75
100
35.4
32.1
3.3
6.2
70
8
0.03
10
Min
4.98
Typ
5.00
±6
±6
± 25
4.95
20 MHz bandwidth
Full load, 2x10µF
ceramic; see fig. 6, 8
0
Output Voltage
10% low
See figure 5
Full load, resistive
Notes &
Conditions
470µF load cap.
1A/µs; see figure 3
50% to 75% load
75% to 50% load
See figures 1, 2
Full load
10mF load
capacitance, Iout=
0A
Notes & Conditions
Vin=50V
Vin=50V
Vin=50V
Min
90.5
91.5
91.5
0
Min
Typ
42
80
18
-
45
2.3
40000
Max
100
10
15
Max
5.02
± 10
± 10
± 40
5.05
Units
V
V
V
V
V
A
mA
mA
A
2
s
mA
Units
V
mV
mV
mV
V
mV
mV
A
A
V
µF
Units
35.0
31.7
3.3
V
IN
=36V; Full Load at
nominal output
voltage
35.2
31.9
3.3
RMS; see figures 6,7
Notes &
Conditions
50 % Load
40
48
150
150
100
4
0
mV
mV
µs
ms
%
Efficiency
Load 100%
Load 75%
Load 50%
Typ
91
92
92
Max
Units
%
%
%
NOTE 1 :
Absolute max. input voltage 80V
P/N 7V7820WC000
HEHB 40A 48V 5V DS 7V78 – page
3-
HEHB40A - 48V – 5V High Efficiency DC-DC Converter
Isolation
characteristics
Isolation Voltage input to output
Isolation Voltage Input to plate
Isolation Capacitance
Isolation Resistance
Notes & Conditions
Basic isolation
Basic isolation
Min
2000
2000
3300
10
Typ
Max
Units
V
DC
V
DC
pF
MΩ
General
characteristics
Operating Range Temperature
Storage Temperature
Relative Humidity
Calculated MTBF
Approvals
Notes & Conditions
Maximum Rating
Maximum Rating
Non condensing
Bellcore Issue 4
RDF93 HRD Issue 5
Min
-40
-50
5
Typ
Max
+100
+120
95
Units
°C
°C
%
1,965,099 hours
EN60955; UL1950; CSA22.2; CE
Feature characteristics
Switching frequency
ON/OFF Control
Off-State Voltage
On-State Voltage
Output Voltage Trim Range
Output Over-Voltage Protection
Over-Temperature shutdown
Min.
Typ.
300
Max
Units
kHz
V
V
%
%
°C
2.7
0
-20
PCB Hot spot
125
15
0.8
+10
130
P/N 7V7820WC000
HEHB 40A 48V 5V DS 7V78 – page
4-
HEHB40A - 48V – 5V High Efficiency DC-DC Converter
Performance Curves
Performance Curves
Figure 1.
Turn-on transient at full rated current (resistive load)
Top Trace: Vout; 2V/div (Vin=50V)
Bottom Trace: ON/OFF; 5V/div
Figure 2.
Turn-on transient at zero load.
Top Trace: Vout; 2V/div (Vin=50V)
Bottom Trace: ON/OFF; 5V/div
Figure 3.
Output Voltage response (200mV/div ) to a step-
change in load current (50% - 75% - 50% of Imax:dI/dt=1A/µs.
Load capacitance: 470µF, 30mOhm ESR tantalum capacitor
.
Figure 4.
Output Voltage response (50mV/div ) to a step- change in load
current (50% - 75% - 50% of Imax:dI/dt=0.1A/µs).
Load capacitance: 470µF, 100mOhm ESR tantalum capacitor
.
P/N 7V7820WC000
HEHB 40A 48V 5V DS 7V78 – page
5-
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