HEQB-25A-48V-3.
.
3V
HEQB-25A-48V-3 3V
48V
in
25A
out
3.3V
out ,
DC-DC Converter
High Efficiency, Isolated Quarter Brick
Feat
t
ure
s
Fea ure
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Very high efficiency: 91%
Wide input voltage range (36 to 75Vdc)
Low profile, industry standard footprint and pin out:
2.3" x 1.45" x 0.36" (58.4mm x 36.8mm x 9.35mm)
Total weight: 34g. (1.2oz.)
Remote ON/OFF
Output voltage trim – Industry standard trim equation
Remote sense
Fixed Frequency (Input-Output ripple 400 kHz)
Under voltage lockout (UVLO), Input – auto recover
Over voltage protection – auto recover
Over current protection – auto recover
Over temperature protection – auto recover
Operating temperature range: -40°C to +100°C
Input to Output Isolation at 2000Vdc, 10MΩ
UL/
C
UL, CSA/CSA
US
, TUV and KEMA Certified
ISO 9001 Certified manufacturing processes
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Product
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HEQB Family of dc-dc converters is
Magnetek’s solution for next
generation, cutting-edge board
applications.
Synchronous rectification uses
MOSFET instead of Schottky diodes
providing extreme reduction in heat
generation, boosting efficiency,
eliminating the need for a heat sink and
increased reliability.
Low profile (0.36”), open frame
construction allows smaller card pitch
and improves system ventilation.
Fixed switching frequency provides
predictable EMI characteristics.
P/N 7Q00H5WB000
Date: 06/03/03
DS HEQB 25A 48V 3-3V_7Q00_030603 Rev 4A – page 1
Magnetek PEG web site, www.magnetekpower.com
HEQB–25A–48V–3.3V
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)
0.14
(3.68)
2.3
(58.42)
2.01
(51)
Ø=0.06 (2 pcs)
(Ø=1.5) (2 pcs)
Ø=0.04 (6 pcs)
(Ø=1) (6 pcs)
1.45
(36.83)
0.3
(7.62)
0.42
(10.8)
0.3
(7.62)
Bottom View
PINOUT Description
Pin
1
2
3
4
5
6
7
8
P/N 7Q00H5WB000
page 2
Name
Vin (-)
ON/OFF
Vin (+)
Vout (+)
Sense (+)
TRIM
Sense (-)
Vout (-)
0.36
(9.35)
0.15
(4)
Function
Negative terminal for the input bus
External input signal, TTL. Output voltage ON or OFF
Positive terminal for the input bus
Positive terminal for output voltage
Positive remote sense
Output voltage TRIM
Negative remote sense
Return terminal for output voltage
DS HEQB 25A 48V 3-3V_7Q00_030603 Rev 4A –
Magnetek PEG web site, www.magnetekpower.com
0.42
(10.8)
0.15x4
(3.81x4).
HEQB–25A–48V–3.3V
Speci
i
f
f
i
i
cat
t
i
i
ons
Spec ca ons
(Typical value standard 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
No-load Input Current
Off Converter Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
NOTE 1:
:
Absolute max. input voltage 80V
NOTE 1:
NOTE 1
Output Characteristics
Output Voltage Set Point
Output Voltage Regulation
Load
Line
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
Notes & Conditions
50 % Load
V
nom
= 48V
I
o
= 15A
3.265
20 MHz bandwidth
Full load,
see figures 1, 4
I
o,
see figures 12, 13
See figure 5
Full load, resistive
60
14
0
26
2.75
0
-
27
2.88
Min
3.28
Typ
3.30
±5
±2
± 15
Max
3.32
±8
±5
± 30
3.335
100
20
25
29
3.05
20000
Units
V
mV
mV
mV
V
mV
mV
A
A
V
µF
Notes & Conditions
Note 1
T< 10µs
Min
36
Typ
48
Max
75
100
35.4
34.8
0.6
2.59
100
6
Units
V
V
V
V
V
A
mA
mA
2
As
mA
34.3
33.8
0.4
V
IN
=36V; Full Load
34.8
34.3
0.5
75
4
0.01
3
RMS; see figures 1, 2
Dynamic Characteristics
Output Voltage Current Transient
Positive Step Change
Negative Step Change
Settling Time to 1%
Turn-On Transient
Overshoot
Turn-On Time
Start-Up Inhibit Period
Efficiency
100% Load
80% Load
56% Load
Notes & Conditions
470µF load cap,
1A/µs; figures 8, 9
50%I
o
to 75% I
o
75% I
o
to 50% I
o
Figures 6 and 7
Min
Typ
Max
Units
170
170
300
0
mV
mV
µs
%
20
ms
ms
Units
%
%
%
Full load
15
120
Min
Typ
90.5
91.0
90.5
Notes & Conditions
V
IN
= 48V
V
IN
= 48V
V
IN
= 48V
Notes & Conditions
Basic Isolation
Basic Isolation
Max
Isolation Characteristics
Isolation Voltage - input to output
Isolation Capacitance
Isolation Resistance
Min
Typ
2000
2200
Max
10
Units
V
DC
pF
MΩ
P/N 7Q00H5WB000
page 3
DS HEQB 25A 48V 3-3V_7Q00_030603 Rev 4A –
Magnetek PEG web site, www.magnetekpower.com
HEQB–25A–48V–3.3V
Feature Characteristics
Switching frequency
ON/OFF Control
Off-State Voltage
On-State Voltage
Output Voltage Trim Range
Output Voltage Remote Sense
Range
Over Voltage Protection
Threshold
Over Current Protection
Threshold
Over Temperature Protection
Threshold
General Characteristics
Operating Range Temperature
Storage Temperature
Relative Humidity
Calculated MTBF
Double Frequency for
Input-Output Ripple
Min.
190
2.7
0
-10
Typ.
200
Max
210
10
0.5
+10
+10
115
125
26-35 A
Average PCB
temperature
Notes & Conditions
Maximum Rating
Maximum Rating
Non condensing
Bellcore Issue 4
RDF93 HRD Issue 5
120
125
°C
130
Units
kHz
V
V
%
%
%
Min
-40
-50
5
Typ
Max
+100
+120
95
Units
°C
°C
%
Min. 1,500,000 hours
Safety and Regulatory
TUV and KEMA certified for basic insulation compliance to EN06950 requirements
UL and CSA 22.2 No. 950-95(US and Canada) certified with basic insulation for compliance to UL60950.
Note : An external input fuse must always be used for compliance to listed safety requirements.
CE compliant per 72/23/EEC (Low voltage directive) and 93/68/EEC to facilitate CE Mark at system level.
Material flammability rating, UL94V-0
NEBS compliant
Charact
t
eri
i
st
t
i
i
c Curves
Charac er s c Curves
Figure 2
Figure 3
Figure 4
-
Is
Ic
DC/DC
Converter
Vout
-
ESR
Cerami c
cap
FIGURE 1:
Set-up diagram showing measurement points for:
Input Terminal Ripple Current, Input Reflected Ripple
Current and Output Voltage Ripple
P/N 7Q00H5WB000
page 4
DS HEQB 25A 48V 3-3V_7Q00_030603 Rev 4A –
Magnetek PEG web site, www.magnetekpower.com
HEQB–25A–48V–3.3V
FIGURE 2:
Input Reflected Ripple Current, set-up per
figure 1; 10µH source impedance. Nominal
input voltage at full rated load.
FIGURE 3:
Input Terminal Ripple Current, set-up per
figure 1, 10µH source impedance and 47µF
electrolytic capacitor Nominal input voltage at
full rated load.
FIGURE 4:
Output Voltage Ripple, set-up per figure 1, 1µF
ceramic capacitor and 10µF tantalum capacitor.
Nominal input voltage at full rated load
FIGURE 5:
Load current as a function of time while
attempting to enable into a short circuit, <10mΩ.
P/N 7Q00H5WB000
page 5
DS HEQB 25A 48V 3-3V_7Q00_030603 Rev 4A –
Magnetek PEG web site, www.magnetekpower.com
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