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參數(shù)資料
| 型號： | FW250C1 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 250 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 646K |
| 代理商： | FW250C1 |
8
Tyco Electronics Corp.
Data Sheet
August 2000
dc-dc Converters; 36 to 75 Vdc Input, 15 Vdc Output; 250 W to 300 W
FW250C1 and FW300C1 Power Modules:
Test Configurations
8-203 (F).o
Note: Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 H. Capacitor CS offsets possible bat-
tery impedance. Measure current as shown above.
Figure 8. Input Reflected-Ripple Test Setup
8-513 (F).m
Note: Use a 0.1 F ceramic capacitor and a 10 F aluminum or
tantalum capacitor. Scope measurement should be made
using a BNC socket. Position the load between 50 mm and
76 mm (2 in. and 3 in.) from the module.
Figure 9. Peak-to-Peak Output Noise
Measurement Test Setup
8-683 (F).f
Note: All measurements are taken at the module terminals. When
socketing, place Kelvin connections at module terminals to
avoid measurement errors due to socket contact resistance.
Figure 10. Output Voltage and Efficiency
Measurement Test Setup
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. For the test configuration in Figure 8, a 100 F
electrolytic capacitor (ESR < 0.3 at 100 kHz)
mounted close to the power module helps ensure sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standard,
i.e.,
UL1950, CSA C22.2 No. 950-95, and VDE 0805
(EN60950, IEC950).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75 Vdc), for the module’s output to be considered
meeting the requirements of safety extra-low voltage
(SELV), all of the following must be true:
s
The input source is to be provided with reinforced
insulation from any hazardous voltages, including the
ac mains.
s
One VI pin and one VO pin are to be grounded, or
both the input and output pins are to be kept floating.
s
The input pins of the module are not operator acces-
sible.
s
Another SELV reliability test is conducted on the
whole system, as required by the safety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module’s output.
Note: Do not ground either of the input pins of the
module without grounding one of the output pins.
This may allow a non-SELV voltage to appear
between the output pin and ground.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 20 A normal-blow fuse in the ungrounded lead.
Cs 220
F
100
F
TO OSCILLOSCOPE
LTEST
BATTERY
12
H
VI (+)
VI (–)
ESR < 0.1
@ 20
°C, 100 kHz
ESR < 0.3
@ 100 kHz
VO (+)
COPPERSTRIP
SCOPE
RESISTIVE
LOAD
1.0
F10.0F
LOAD
CONTACT AND
SUPPLY
II
CONTACT
VI(+)
VI(–)
SENSE(+)
SENSE(–)
VO(+)
VO(–)
DISTRIBUTION LOSSES
RESISTANCE
IO
η
VO +
() – VO –
()
[]IO
VI +
() – VI –
()
[]II
--------------------------------------------------
x 100
%
=
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