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Tyco Electronics Corp.
7
Data Sheet
October 1997
18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W
JC050B, JC075B, JC100B Power Modules: dc-dc Converters;
Characteristic Curves (continued)
8-1243 (C).b
Figure 9. Typical JC100B Converter Efficiency vs.
Output Current at Room Temperature
8-1266 (C)
Figure 10.Typical Start-Up from Remote On/Off
JCxxxB1; IO = Full Load
Test Configurations
8-203 (C).l
Note:Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 µH. Capacitor CS offsets possible
battery impedance. Measure current as shown above.
Figure 11. Input Reflected-Ripple Test Setup
8-513 (C).d
Note:Use a 1.0 µF ceramic capacitor and a 10 µF aluminum
or tantalum capacitor. Scope measurement should be
made using a BNC socket. Position the load between
51 mm and 7 6mm ( 2in .an d 3in.) from the module.
Figure 12. Peak-to-Peak Output Noise
Measurement Test Setup
01
3
46
7
8
77
83
84
85
86
OUTPUT CURRENT, IO (A)
81
80
79
78
82
5
2
18 V
28 V
36 V
0 V
0 V
TIME, t (5 ms/div)
TO OSCILLOSCOPE
12 µH
CS 220 µF
ESR < 0.1
Ω
@ 20 ˚C, 100 kHz
VI(+)
VI(–)
BATTERY
33 µF
CURRENT
PROBE
LTEST
ESR < 0.7
Ω
@ 100 kHz
VO(+)
VO(–)
1.0 µF
RESISTIVE
LOAD
SCOPE
COPPER STRIP
10 µF
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