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UC3842A Datasheet(PDF) 5 Page - STMicroelectronics

Part No. UC3842A
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842A Datasheet(HTML) 5 Page - STMicroelectronics

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Figure 1: Open Loop Test Circuit.
RT
A
2N2222
4.7K
1K
ERROR AMP.
ADJUST
4.7K
5K
ISENSE
ADJUST
100K
COMP
V
FB
ISENSE
RT/CT
1
2
3
4
C
T
7
6
5
8
VREF
V
i
OUTPUT
GROUND
0.1
µF
0.1
µF
VREF
V
i
OUTPUT
GROUND
1W
1K
D95IN343
High peak currents associated with capacitive loads
necessitate careful grounding techniques. Timing
and bypass capacitors should be connected close
to pin 5 in a single point ground. The transistor and
5K
Ω potentiometerareusedto samplethe oscillator
waveform and apply an adjustable ramp to pin 3.
300
1K
3K
10K
30K
RT(Ω)
1K
10K
100K
1M
fo
(Hz)
D96IN362
CT=470pF
1nF
2.2nF
4.7nF
Figure 2: Oscillator Frequency vs Timing Resis-
tance
300
1K
3K
10K
30K
RT(Ω)
0
20
40
60
fo
(Hz)
D96IN363
80
Figure 3: Maximum Duty Cycle vs Timing Resis-
tor
UC3842A
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
5/15


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