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参数资料
| 型号： | LW005A |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 5 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | 32 X 25.40 MM, 10.20 MM HEIGHT, LOW PROFILE, MODULE |
| 文件页数： | 2/20页 |
| 文件大小： | 369K |
| 代理商： | LW005A |
10
Lucent Technologies Inc.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Test Congurations (continued)
8-513(C)
Note: Use one external 0.1
F ceramic capacitor. Scope measure-
ment should be made using a BNC socket. Position the load
between 50 mm and 75 mm (2 in. and 3 in.) from the module.
Figure 17. Peak-to-Peak Output Noise
Measurement Test Setup
8-204(C)
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 18. Output Voltage and Efciency
Measurement Test Setup
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source (see Figure 16). Highly
inductive source impedances can affect the stability of
the power module. If the source inductance exceeds
5
H, a 33 F electrolytic capacitor (ESR < 0.7 at
100 kHz) mounted close to the power module helps
ensure stability of the unit.
Safety Considerations (LC Modules)
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.,
UL 1950, CSA C22.2 No. 950-95, and VDE 0805
(EN60950, IEC950).
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements.
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 5 A normal-blow fuse in the ungrounded lead.
Safety Considerations (LW Modules)
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.,
UL 1950, 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 other hazardous voltages, includ-
ing 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 oating.
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 pins 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 5 A normal-blow fuse in the ungrounded lead.
VO(+)
VO(–)
RESISTIVE
LOAD
SCOPE
0.1 F
COPPER STRIP
VI(+)
VI(–)
VO(+)
VO(–)
II
IO
SUPPLY
CONTACT RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
η
VO(+)
VO(–)
–
[]IO
VI(+)
VI(–)
–
[]II
------------------------------------------------
100
×
=
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