UC3842 Просмотр технического описания (PDF) - Philips Electronics
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UC3842 Datasheet PDF : 8 Pages
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Philips Semiconductors Linear Products
Current-mode PWM controller
Product specification
UC3842
CURRENT SENSE CIRCUIT
IS
ERROR
AMP
R
RS
1
COMP
3
CURRENT
SENSE
5
GND
NOTE:
Peak current (IS) is determined by the formula:
1.0V
IS MAX + Rs
A small RC filter may be required to suppress switch transients.
TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Characteristics
4
3
2
1
0
0.01
0.03 0.05 0.1
0.3 0.5 1.0
OUTPUT CURRENT, SOURCE OR SINK (A)
2R
R
1V
CURRENT
SENSE
COMPARATOR
Error Amplifier Open-Loop
Frequency Response
100
45
80
0
0
Av
60
–45
40
–90
20
–135
0
–180
–20
–225
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
August 31, 1994
1104
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