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UC3842 Datasheet(PDF) 7 Page - STMicroelectronics

Part # UC3842
Description  CURRENTMODE PWM CONTROLLER
Download  11 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842 Datasheet(HTML) 7 Page - STMicroelectronics

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Figure 9 : Open Loop Test Circuit.
High peak currents associatedwith 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 potentiometerareusedtosampletheoscillator
waveform and apply an adjustable ramp to pin 3.
Figure 10 : Shutdown Techniques.
Shutdown of the UC2842 can be accomplished by
two methods; either raise pin 3 above 1V or pull pin
1 below a voltage two diode drops above ground.
Either method cause the output of the PWM com-
parator to be high (refer to block diagram). The
PWM latch is reset dominant so that the output will
remain low until the next clock cycle after the shut-
down conditionat pins 1 and/or 3 is removed. In one
example, an externally latched shutdown may be
accomplishedby addingan SCR which will be reset
by cycling Vi belowthe lower UVLOthreshold.At this
point the referenceturns off, allowing the SCR to re-
set.
UC2842/3/4/5-UC3842/3/4/5
7/11


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