P/N 7A04I4WHXXX DS HEHB 70A 48V 1.2V 7A04 Rev.01-07-03.doc– page 1 –
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• Very high efficiency: 88% at 30A load, 84% at
full rated load current
• Wide input voltage range (35 to 75Vdc)
• Total weight: 77 grams (2.67 oz.) Open-Frame Version
• Low profile, industry standard footprint and pinout:
2.3" x 2.4" x 0.44" (58.4mm x 61.0mm x 11.2mm)
• Back Bias protection
Monolithic start-up, with pre-biased output
• Parallel for increased power:
External Clock Synchronization (Option)
Current Share, Primary (Option)
• Soft Start
• Remote ON/OFF
• Output voltage trim – Industry standard trim equation
• Remote sense
• Fixed Switching Frequency
(Output ripple frequency @ 420 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
• Pending- UL/CUL, CSA/CSAUS, TUV and KEMA
• ISO 9001 Certified manufacturing processes
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• HEHB 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 (0.44”), open frame construction
allows smaller card pitch and improves
system ventilation.
• Fixed switching frequency provides
predictable EMI characteristics.
HEHB–70A–48V–1.2V
P/N 7A04I4WHXXX DS HEHB 70A 48V 1.2V 7A04 Rev.01-07-03.doc– page 2 –
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- All dimensions are in inches (mm)
Tolerances: x.xx in.
+/-0.2 in. (0.5mm)
PINOUT Description
Pin Name Function
1Vin (-) Negative terminal for the input bus
2(No Pin) Optional Current Share, -F OnlyExternal input signal.
A(No Pin) Optional Clock Sync, -F Only
3ON/OFF Remote Enable/Disable terminal, input signal TTL
4Vin (+) Positive terminal for the input bus
5Vout (+) Positive terminal for output voltage
6Sense (+) Positive remote sense
7TRIM Output voltage TRIM
8Sense (-) Negative remote sense
9Vout (-) Return terminal for output voltage
HEHB–70A–48V–1.2V
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(Typical values are at nominal input line, full load, airflow 300 LFM, 25°C ambient temperature unless otherwise specified)
Input Characteristics Notes & Conditions Min Typ Max Units
Operating Input Voltage Range Note 1 35 48 75 V
Input Surge Voltage T< 100msec 100 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 34.4 V
Turn-Off Voltage Threshold 33.1 V
Lockout Hysteresis Voltage TBA V
Maximum Input Current (IINmax)VIN=35V; Full Load at
nominal output voltage 2.9 A
No-load Input Current 60 70 mA
Off Converter Input Current 11 13 mA
Inrush Current Transient Rating 0.03 A2s
Input Reflected-Ripple Current RMS; see figures 6,7,8 TBA mA
Output Characteristics Notes & Conditions Min Typ Max Units
Output Voltage Set Point 50 % Load 1.188 1.2 1.212 V
Output Voltage Regulation
Over Load ± 5 ± 8 mV
Over Line ± 4 ± 6 mV
Over Temperature ± 5 ± 15 mV
Total Output Voltage Range
over sample, line,
load, temperature
and life
1.164 1.236 V
Output Voltage Ripple and Noise 20 MHz bandwidth
Peak to Peak 50 80 mV
RMS
Full load
see figures 6 & 9 10 20 mV
Operating Output Current Range 0 - 70 A
Output DC Current Limit Inception
(hiccup mode: 30msec ON, 220msec
OFF)
See Figure 5 77 84 A
Admissible Output Capacitance Full load, resistive 050,000 µF
Dynamic Characteristics Notes & Conditions Min Typ Max Units
Output Voltage during Load Current
Transient
15µF load cap. 5A/µs;
see figure 3,4
Step Change in IOUT (0.1A/µs) 50% to 75% Iout max 65 mV
Step Change in IOUT (1A/µs) 75% to 50% Iout max 130 mV
Settling Time to 1% of Vout nom 200 µs
Turn On Transient See figures 1, 2
Turn On Time Full load 160 200 ms
Output Voltage Overshoot 10,000 µF load
capacitance, Iout= 0A 0 %
Efficiency Notes & Conditions Min Typ Max Units
100% Load 84 %
75% Load 86 %
50% Load
Vin = 50V
88 %
NOTE 1 : Absolute max. continuous input voltage = 80V (operating) ; 100V (Surge).
HEHB–70A–48V–1.2V
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Isolation Characteristics Notes & Conditions Min Typ Max Units
Isolation Voltage input to output Basic isolation 2000 VDC
Isolation Voltage Input to plate Basic isolation 2000 VDC
Isolation Capacitance 3300 pF
Isolation Resistance 10 MΩ
General Characteristics Notes & Conditions Min Typ Max Units
Operating Range Temperature With appropriate power
derating -40 +100 °C
Storage Temperature Maximum Rating -50 +120 °C
Relative Humidity Non condensing 5 95 %
Calculated MTBF Bellcore Issue 4
RDF93 HRD Issue 5 TBA
Feature Characteristics Min. Typ. Max Units
Switching frequency 420 kHz
ON/OFF Control
Off-State Voltage 1.5 5 V
On-State Voltage 01.2 V
Output Voltage Trim Range -20 +10 %
Output Over-Voltage Protection 115 120 130 %
Over-Temperature shutdown PCB Hot spot 125 °C
Safety and Regulatory (PENDING)
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
HEHB–70A–48V–1.2V
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Figure 2.Vout, Turn-on transient at NO load
(Vin=48V) (5 ms/div, 0.5V/div)
Figure 3. Output voltage response to dynamic change in load
current: 75% Io to 50%Io , where:
di / dt = 5 A / µs
Load capacitance: 15µF, 30 mΩ ESR tantalum
1µF ceramic capacitor
Figure 4. Output voltage response to dynamic change in load current:
75% Io to 50%Io , where:
di / dt = 1 A / µs
Load capacitance: 15µF, 30 mΩ ESR tantalum
1µF ceramic capacitor
Figure 1. Vout, Turn-on transient at full rated current (resistive load)
(Vin=48V) (5 ms/div, 0.5V/div)
HEHB–70A–48V–1.2V
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Figure 6. Test set-up diagram showing measurement point for
Input Reflected Ripple Current and Output Voltage
Ripple.
Figure 7
-
Cerami c
cap
ESR
Ic
DC/DC
Converter Vout
Is
-
Figure 9
Source
impedance
Tantalum cap
Figure 5. Load current as a function of time while
attempting to enable into a short circuit, <10mΩ.
HEHB–70A–48V–1.2V
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Figure 7. Input Reflected Ripple Current, set-up per figure 6;
10µH source impedance. Nominal input voltage at
full rated load.
Figure 8. Input terminal ripple current (ic) at full rated load
and nominal input voltage.
Figure 9. Output Voltage Ripple at Nominal input voltage and full rated
load, set-up per figure 6, where:
Bandwidth; 20kHz
Load Capacitance; 15µF electrolytic capacitor
1µF ceramic capacitor
To be provided in the next issue To be provided in the next issue
HEHB–70A–48V–1.2V
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Figure 10. Efficiency vs. load current for minimum, nominal and maximum input voltage at 25°C.
Figure 11 .Power dissipation vs. load current for minimum, nominal and maximum input voltage at 25°C.
HEHB–70A–48V–1.2V
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Figure 12: Maximum output power derating curves vs.
ambient air temperature for airflow rates of 0
LFM through 400 LFM with air flowing from
input to output and nominal input voltage.
Figure 13: Maximum output power derating curves vs.
ambient air temperature for airflow rates of
100 LFM through 400 LFM with air flowing
from pin 1 to pin 4, Transversal and
nominal input voltage.
To be provided in the next issue
To be provided in the next issue
HEHB–70A–48V–1.2V
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REMOTE ON-OFF CONTROL
The default logic is negative, where the Remote On/Off (pin 2) input is referenced to -Vin (pin 1).
The Remote On/Off signal must be lower than 0.8V to enable the output voltage, and higher than
2.7V to disable the output voltage.
Positive logic is an available option, add “–P” to the end of the ordering code.
TRIMMING
The output voltage can be trimmed by means of an external resistor connected between Trim (pin
6) and +Sense (pin 6) or -Sense (pin 8). The selection of the resistor follows the industry standard
trim equation.
An external resistor connected between Trim and –Sense pins will decrease the output voltage.
For a decrease of ∆% of the nominal output voltage, calculate the value of the external resistor
using the following equation:
Rtrim-down = Ω−
∆k2
%100 , where ∆= %100
×
−
V
VV
nominal
targetnominal
TRIM DOWN
1
10
100
1000
0 2 4 6 8 10 12 14 16 18 20
% Decrease in Output Voltage
Trim Resistance (kOhms)
ON /OFF
Vin (-)
Direct Logic Drive
ON /OFF
Vin (-)
Negative logic
(permanently Enabled)
ON /OFF
Vin (-)
Remote Enable Circuit
Vin (-)
Vin (-)
Open Collector Enable Circuit
HEHB–70A–48V–1.2V
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A resistor connected between Trim and + S pins will increase the output voltage. For a desired
increase of ∆% of the nominal output voltage, the value of the resistor should be:
Rtrim-up = kΩ
2
VV
VV
V
V
nomtar
nomtar
ref
nom
−
+•
−
,
Where Vnom = Nominal Voltage, Vtar = Target Voltage, Vref =1.225 V
SENSE (+ or -)
The +Sense or –Sense pins must be connected to the load or output pins of the converter. To
ensure tight regulation at the system critical load, then the remote sense pins should be connected
to the system critical load. Reference applicable section of data sheet for maximum voltage
compensation.
Ensure sufficient margin to the over voltage threshold, review applicable sections of the data sheet
and system loading: output over-voltage protection –Vs- system transient load condition(s).
TRIM UP
10
100
1000
012345678910
% Increase in Output Voltage
Trim Resistance (kOhms)
HEHB–70A–48V–1.2V
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THERMAL CONSIDERATIONS
The converter has internal thermal protection preventing hot spots on PCB from exceeding MFR’s
recommended temperatures for reliable operation, reference over temperature protection threshold
(Section: Feature Characteristics). Margin to the temperature protection limit should be verified in
the application, and should not exceed 120°C on the thermal reference points as shown in Figure
14.
During an abnormal condition inducing an increase in the converter temperature, the converter
output voltage will fold back when the over temperature protection threshold is reached. The
converter will auto-recover when the fault condition is corrected and time allowed for the converter
to cool down.
Figure 14, Thermal reference points
OVER CURRENT PROTECTION
The overcurrent limit inception is typically 110% of the rated output current will cause the output
voltage enter fault protection, or hiccup reference Figure 5. The converter will enter fault protection
typically at 125% of rated output current. When the fault is removed the converter will auto recover.
To be provided in next issue.
HEHB–70A–48V–1.2V
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:
:
Product
Family
Code
Rated
Output
Current
Input
Voltage
Output
Voltage
Option 1-
Remote On/Off
Logic
Option 2-
Mechanical
Option 3-
Parallel Functions
Option 4-
Pin Length
HEHB 70A 48V 1.2V Default → Negative
P → Positive
Default → Open Frame
PL → Cold Plate
DefaultÆ None
FÆ Clock Sync &
Current share
Default → 0.15”
1 → 0.25”
2 → 0.11”
Example
HEHB-70A-48V-1.2V-PPLF1 Standard Half Brick with Positive Logic Remote On/Off, Cold
Plate, (Clock Sync and Current Share) and 0.25” pin length
options.
Europe
Magnetek S. p. A
Via S.Giorgio 642
52028- Terranuova Bracciolini, Arezzo, Italy
Phone: (+39) 055.9195.1
Fax: (+39) 055.9195.248
US
Magnetek Inc.
8966 Mason Avenue
Chatsworth, CA 91311, USA
Phone: (+1) 818.727.2216
Fax: (+1) 818.727.2276
Toll-Free Number: (+1) 800.621.0733
