FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
Features
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Applications
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Base station amplifiers
Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
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Description
The FHS Series power modules are dc-dc converters that operate over an input voltage range of 36 to 75VDC and
provide a regulated DC output voltage at up to 18 amps of output current. The output is fully isolated from the
input, which allows a positive or negative output configuration.
The open-frame module is constructed with a two-board approach. The power devices are connected to an
Insulated Metal Substrate (IMS) base plate, which provides very low thermal impedance. A separate PCB is
populated with the control circuitry and is physically isolated from the hotter IMS board. This approach allows for
lower component temperatures, hence increased reliability. The standard feature set includes remote on/off,
1
remote output voltage sensing, negative logic output trim (optional positive logic output trim available ), input under
and overvoltage lockout and overtemperature shutdown with hysteresis.
Model Selection
Model
Input
voltage
(VDC)
36-75
Input
current, Max,
(ADC)
16
Output
voltage
(VDC)
28
Output rated
current
I
rated,
(ADC)
18
Output
Ripple/Noise
(mV p-p)
150
Typical
Efficiency
@ I
rated,
(%)
93
Low profile – 12.7 mm height
Input-to-output isolation: 1500VDC
Basic insulation
High efficiency - up to 93% at full load
Tight dynamic load response
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Remote sense
Remote on/off (primary referenced), positive
or negative logic option
Output voltage trim adjust, positive or
negative option
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
FHS18Z28
This product is intended for integration into end-use equipment.
equipment should be followed.
1
All the required procedures for CE marking of end-use
Consult factory for availability.
REV. JUN 09, 2004
Page 1 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-
term reliability and cause permanent damage to the converter.
Parameter
Input voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Output Power
Referenced to -Vin
Conditions/Description
Continuous
Transient, 100ms
Baseplate Temperature
-40
-55
Min
Max
75
100
110
125
7
504
Units
VDC
VDC
°C
°C
VDC
W
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF
Standard process
Per Bellcore TR-NWT-000332
Conditions/Description
Halfsine wave, 3 axes
GR-63-CORE, Section 5.4.2
Min
50
1
5.4/152
Yes
1,000
kHrs
Nom
Max
Units
g
g
Oz/g
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Input to output, input to base plate
Output to base plate
1500
1500
10
1000
Conditions/Description
Min
Nom
Basic
VDC
VDC
MOhm
pF
Max
Units
Safety Regulatory Compliance
Safety Agency
Underwriters Laboratories
TUV product Service
CB report
Standard Approved To:
UL60950/CSA60950-00
TUV EN60950:2000
IEC60950:1999
Marking
cULus
TUV PS Baurt mark
N/A.
REV. JUN 09, 2004
Page 2 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Turn On/Off Hysteresis
Input over voltage protection
Input Reflected Ripple Current
Inrush Transient
1
2
Conditions/Description
Continuous
Ramping Up
1
Min
36
32
Nom
48
34
32
80
Max
75
36
34
84
60
0.1
Units
VDC
VDC
VDC
VDC
VDC
mA
P-P
As
2
Ramping Down
1
30
1.5
76
Turn-Off threshold
Full Load, 12µH source inductance
2
BW=20MHz
Vin=Vin.max
Refer to Fig. 2 for waveform.
Refer to Fig. 10 for Test measurement circuit.
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current
Line Regulation
Load Regulation
Output Temperature Regulation
1,2
Ripple and Noise, DC to 20MHz
Dynamic Regulation
Peak Deviation
Settling Time
3
Output Turn-On Time
Admissible Load Capacitance
Backdrive Protection
Switching Frequency
1
2
3
Conditions/Description
Vin=Vin.nom, Full Load
Vin.min to Vin.max, I
RATED-MAX
Vin=Vin.nom, 10% to 100%I
rated
O
O
T
Baseplate
= -40 C to +110 C)
Over line and load
Tamb= 0°C to 85°C
50-75% load step change
to 1% error band
To 97% Vo
NOM
I
RATED, resistive load
, Vin
NOM
No damage to converter
Min
27.44
1.8
Nom
28
0.2
0.5
150
30
700
250
15
Yes
400
Max
28.56
18
0.5
1.0
0.02
Units
Vdc
A
%Vout
%Vout
O
%Vo/ C
mV
P-P
mV
RMS
mV
µs
ms
µF/A
kHz
800
750
25
100
At Iout<Iout-min, the output may contain low frequency component that exceeds ripple specifications.
See Figure 11 for test setup
Refer to fig. 3
REV. JUN 09, 2004
Page 3 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
Protections Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Type
Threshold
Short Circuit
Type
Threshold
Type
Threshold
Recovery
1
Conditions/Description
Overcurrent Protection
Min
Nom
Max
Units
Non-latching, auto-recovery
20
Hiccup-type
1
2
23
29
15
A
A
RMS
Overvoltage Protection
All Vin and Io conditions
Clamping / Hiccup, auto-recovery
115
140
% Vout
Overtemperature Protection
Non-latching, auto-recovery
Baseplate temperature
2
120
90
130
°C
°C
Refer to Fig. 4
Refer to Fig. 5
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Negative Logic (-N suffix)
Conditions/Description
ON/OFF
ON/OFF signal is low or the pin is
connected to -Vin – converter is ON
Von/off in reference to -Vin
ON/OFF pin is connected to -Vin
Von/off in reference to -Vin
ON/OFF pin is floating
On/Off signal is low or the pin is floating
–converter is OFF
Von/off in reference to -Vin
ON/OFF pin is floating
Von/off in reference to -Vin
ON/OFF pin is connected to -Vin
Remote Sense
Remote Sense Headroom
Output Voltage Trim
Trim Up
Trim Down
1
2
2
1
Min
Nom
Max
Units
Converter ON
Source Current
Converter OFF
Open Circuit Voltage
Positive Logic (no suffix)
-0.5
0.5
2.5
0.8
1
7
5
VDC
mADC
VDC
VDC
Converter ON
Open Circuit Voltage
Converter OFF
Source Current
2.5
-0.5
0.5
7
5
0.8
1
5
VDC
VDC
VDC
mADC
%Vout
Vin = Vin-nom, Iout=I
rated
Vin = Vin-nom, Iout=I
rated
10
-10
%
%
Additional information located on page 6.
2 Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of Vout.
REV. JUN 09, 2004
Page 4 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
Efficiency Characteristics
Turn-on Waveform
FHS18Z28. EFF. VS. LOAD
100
95
90
85
EFFICIENCY %
80
75
70
65
60
55
50
45
40
10
20
30
40
50
LOAD %
EFF.(36V)
EFF.(48V)
60
70
80
EFF.(75V)
90
100
Figure 1. FHS18Z28 Efficiency vs. Output Load
Input Turn-On / Off Operation
Figure 3. Output Voltage turn-on FHS18Z28
Conditions: Vin=48V, Load: full, , Co=none
(Note: monotonic rise characteristic)
Input Current vs. Voltage
17
16
15
14
13
12
Short Circuit Operation
Input Current (A)
11
10
9
8
7
6
5
4
3
2
1
0
0
10
20
30
40
50
60
70
80
Turn On
Voltage
Threshold
Turn Off
Voltage
Threshold
Input Voltage (V)
Figure 4. Output Current with Shorted Output Pins,
Vin = 75Vdc, Scale is 20Amp/Div.
(Actual amplitude: 10.8A
RMS
)
Once the output current is brought back into its
specified range, the converter automatically exits
the hiccup mode and continues normal operation.
Figure 2. FHS18Z28 Input UVLO Characteristics
REV. JUN 09, 2004
Page 5 of 11
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