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UC3842 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. UC3842
Description  Current-mode PWM controller
Download  8 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

UC3842 Datasheet(HTML) 5 Page - NXP Semiconductors

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


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