參數(shù)資料
型號(hào)： JAW050A1
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 7/16頁(yè)
文件大?。?/td> 359K
代理商： JAW050A1
Advance Data Sheet
May 1999
Lucent Technologies Inc.
7
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Test Configurations
8-203(C).l
Note: Measure input reflected-ripple current with a simulated source
inductance (L
TEST
) of 12
μ
H. Capacitor C
S
offsets possible bat-
tery impedance. Measure current as shown above.
Figure 9. Input Reflected-Ripple Test Setup
8-513(C).d
Note: Use a 1.0
μ
F ceramic capacitor and a 10
μ
F aluminum or tan-
talum capacitor. Scope measurement should be made using a
BNC socket. Position the load between 51 mm and 76 mm
(2 in. and 3 in.) from the module.
Figure 10. Peak-to-Peak Output Noise
Measurement Test Setup
8-749(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 11. 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 9, a 33
μ
F elec-
trolytic capacitor (ESR < 0.7
at 100 kHz) mounted
close to the power module helps ensure stability 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., UL 1950, CSAC22.2 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:
I
The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains; and
I
One V
I
pin and one V
O
pin are to be grounded or both
the input and output pins are to be kept floating; and
I
The input pins of the module are not operator acces-
sible; and
I
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 6 A normal-blow fuse in the ungrounded lead.
TO OSCILLOSCOPE
12 μH
V
I
(+)
V
I
(–)
CURRENT
PROBE
L
TEST
BATTERY
C
S
220 μF
ESR < 0.1
°
C, 100 kHz
33 μF
ESR < 0.7
V
O
(+)
V
O
(–)
1.0 μF
RESISTIVE
LOAD
SCOPE
COPPER STRIP
10 μF
V
I
(+)
I
I
I
O
SUPPLY
CONTACT
RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
SENSE(+)
V
I
(–)
V
O
(+)
V
O
(–)
SENSE(–)
η
V
(+) – V
(–)
I
(+) – V
I
(–)
----V
]
I
O
]
I
I
x 100
=
%
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