Data Sheet
July 2001
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Features
s
Small size: 36.8 mm x 57.9 mm x 12.7 mm
(1.45 in. x 2.28 in. x 0.50 in.)
High power density
High efficiency: 86% typical
Low output noise
Constant frequency
Industry-standard pinout
Metal baseplate
2:1 input voltage range
Overtemperature, overvoltage and overcurrent pro-
tection
Negative remote on/off
Remote sense
Adjustable output voltage
s
s
s
s
s
s
s
The QHW Series Power Modules use advanced, surface-
mount technology and deliver high-quality, efficient, and
compact dc-dc conversion.
s
s
s
Applications
s
s
s
s
s
Distributed power architectures
Communications equipment
Computer equipment
ISO*
9001 and
ISO
14001 Certified manufacturing
facilities
UL
†
60950 Recognized,
CSA
‡
C22.2 No. 60950-00
Certified, and
VDE
§
0805 (IEC60950) Licensed
CE mark meets 73/23/EEC and 93/68/EEC direc-
tives**
s
s
Options
s
s
Heat sinks available for extended operation
Auto-restart after overtemperature, overvoltage, or
overcurrent shutdown
Choice of short pin lengths
Case ground pin
s
s
*
ISO
is a registered trademark of the International Organization
for Standardization.
†
UL
is a registered trademark of Underwriters Laboratories, Inc.
‡
CSA
is a registered trademark of Canadian Standards Associa-
tion.
§
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
** This product is intended for integration into end-use equipment.
All the required procedures for CE marking of end-use equip-
ment should be followed. (The CE mark is placed on selected
products.)
Description
The QHW050G1, QHW075G1, and QHW100G1 Power Modules are dc-dc converters that operate over an
input voltage range of 36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully iso-
lated from the inputs, allowing versatile polarity configurations and grounding connections. The modules have
maximum power ratings from 25 W to 50 W at a typical full-load efficiency of 86%.
The sealed modules offer a metal baseplate for excellent thermal performance. Threaded-through holes are pro-
vided to allow easy mounting or addition of a heat sink for high-temperature applications. The standard feature set
includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications.
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Data Sheet
July 2001
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Input Voltage:
Continuous
Transient (100 ms)
Operating Case Temperature
(See Thermal Considerations section.)
Storage Temperature
I/O Isolation Voltage (for 1 minute)
Symbol
V
I
V
I, trans
T
C
T
stg
—
Min
—
—
–40
–55
—
Max
80
100
100
125
1500
Unit
Vdc
V
°C
°C
Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current:
V
I
= 0 V to 75 V; I
O
= I
O, max
; see Figures 1—3:
QHW050G1
QHW075G1
QHW100G1
V
I
= 36 V to 75 V; I
O
= I
O, max
:
QHW050G1
QHW075G1
QHW100G1
Inrush Transient
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 15.)
Input Ripple Rejection (100—120 Hz)
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-
ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 20 A (see Safety Considerations section).
Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same
type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
Symbol
V
I
Min
36
Typ
48
Max
75
Unit
Vdc
I
I, max
I
I, max
I
I, max
I
I, max
I
I, max
I
I, max
i
2
t
I
I
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
10
2.5
3.5
4.5
2.5
3.5
4.5
1.0
—
A
A
A
A
A
A
A
2
s
mAp-p
—
—
60
—
dB
2
Tyco Electronics Corp.
Data Sheet
July 2001
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
C
= 25 °C)
Output Voltage
(Over all operating input voltage, resistive
load, and temperature conditions until end of
life. See Figure 17.)
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
C
= –40 °C to +100 °C)
Output Ripple and Noise Voltage
(See Figure 16.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
External Load Capacitance
Output Current
Device
All
All
Symbol
V
O, set
V
O
Min
2.46
2.42
Typ
2.5
—
Max
2.54
2.58
Unit
Vdc
Vdc
All
All
All
—
—
—
—
—
—
0.01
0.1
8
0.1
0.4
25
%V
O
%V
O
mV
All
All
All
QHW050G1
QHW075G1
QHW100G1
QHW050G1
QHW075G1
QHW100G1
QHW050G1
QHW075G1
QHW100G1
All
—
—
—
I
O
I
O
I
O
I
O, cli
I
O, cli
I
O, cli
η
η
η
—
—
—
0
0
0
0
—
—
—
—
—
—
—
—
—
—
—
—
—
12
18
24
84
86
85
380
40
200
*
mVrms
mVp-p
µF
A
A
A
A
A
A
%
%
%
kHz
10
15
20
20
†
25
†
30
†
—
—
—
—
Output Current-limit Inception
(V
O
= 90% of V
O, nom
)
Efficiency (V
I
= 48 V; I
O
= I
O, max
; T
C
= 70 °C;
see Figure 17.)
Switching Frequency
Dynamic Response
(∆I
O
/∆t = 1 A/10 µs, V
I
= 48 V, T
C
= 25 °C;
tested with a 220 µF aluminum and a 1.0 µF
ceramic capacitor across the load):
Load Change from I
O
= 50% to 75% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Load Change from I
O
= 50% to 25% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
All
All
All
All
—
—
—
—
—
—
—
—
300
300
300
300
—
—
—
—
mV
µs
mV
µs
* Consult your sales representative or the factory.
† These are manufacturing test limits. In some situations, results may differ.
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Min
—
10
Typ
2500
—
Max
—
—
Unit
pF
MΩ
Tyco Electronics Corp.
3
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Data Sheet
July 2001
General Specifications
Parameter
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40 °C)
Weight
—
Min
Typ
2,341,000
—
75 (2.7)
Max
Unit
hours
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See the Feature Descriptions section for additional information.
Parameter
Remote On/Off Signal Interface
(V
I
= 0 V to 75 V; open collector or equivalent compatible;
signal referenced to V
I
(–) terminal):
Logic Low—Module On
Logic High—Module Off
Logic Low:
At I
on/off
= 1.0 mA
At V
on/off
= 0.0 V
Logic High:
At I
on/off
= 0.0 µA
Leakage Current
Turn-on Time (See Figure 14.)
(I
O
= 80% of I
O, max
; V
O
within ±1% of steady state)
Output Voltage Adjustment:
Output Voltage Remote-sense Range
Output Voltage Set-point Adjustment Range (trim)
Output Overvoltage Protection
Overtemperature Protection
* These are manufacturing test limits. In some situations, results may differ.
Symbol
Min
Typ
Max
Unit
V
on/off
I
on/off
V
on/off
I
on/off
—
0
—
—
—
—
—
—
—
—
20
1.2
1.0
15
50
35
V
mA
V
µA
ms
—
—
V
O, sd
T
C
—
90
3.0*
—
—
—
—
105
0.5
110
3.4*
—
V
%V
O, nom
V
°C
Solder, Cleaning, and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inad-
equate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to
the
Board-Mounted Power Modules Soldering and Cleaning
Application Note (AP97-021EPS).
4
Tyco Electronics Corp.
Data Sheet
July 2001
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Characteristic Curves
The following figures provide typical characteristics for the power modules.
1.2
INPUT CURRENT, I
I
(A)
1.0
I
O
= 10 A
0.8
0.6
0.4
I
O
= 1 A
0.2
0
20
25
30
35
40
45
50
55
60
65
70
75
1-0001
2.5
2
I
O
= 20 A
I
O
= 11 A
I
O
= 2 A
INPUT CURRENT, I
I
(A)
1.5
I
O
= 6 A
1
0.5
0
20 25
30
35
40
45
50
55
60
65
70 75
INPUT VOLTAGE, V
I
(V)
INPUT VOLTAGE, V
I
(V)
8-3370 (F)
Figure 1. Typical QHW050G1 Input Characteristics
at 25 °C
Figure 3. Typical QHW100G1 Input Characteristics
at 25 °C
1.8
INPUT CURRENT, I
I
(A)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
20
25
30
35
40
45
50
55
60
65
70
75
1-0002
87
84
EFFICIENCY,
η
(%)
I
O
= 15 A
81
78
75
72
69
66
63
1
2
3
4
5
6
7
8
9
10
1-0003
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
I
O
= 8 A
I
O
= 1.5 A
OUTPUT CURRENT, I
O
(A)
INPUT VOLTAGE, V
I
(V)
Figure 2. Typical QHW075G1 Input Characteristics
at 25 °C
Figure 4. Typical QHW050G1 Converter Efficiency
vs. Output Current at 25 °C
Characteristic Curves
(continued)
Tyco Electronics Corp.
5
嵌入式系统
