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UC3842A Arkusz danych(PDF) 5 Page - Unisonic Technologies

Numer części UC3842A
Szczegółowy opis  CURRENT MODE PWM CONTROL CIRCUITS
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Producent  UTC [Unisonic Technologies]
Strona internetowa  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3842A Arkusz danych(HTML) 5 Page - Unisonic Technologies

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UTCUC3842A/3843A LINEARINTEGRATEDCIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
5
QW-R103-002,A
OSCILLATOR SECTION
5
4
8
RT
CT
Large RT
Small CT
Small RT
Large CT
V4
V4
INTERNAL
CLOCK
INTERNAL
CLOCK
Dead time VS CT(RT>5k
Ω)
Timing Resistance Vs Frequency
1
10
100
1
10
100
0.1
td (
µs)
CT (nF)
100
1
10
6
10
5
10
4
10
3
10
10
2
RT (k
Ω)
Frequency (Hz)
CT=1nF
CT=2.2nF
CT=4.7nF
CT=10nF
CT=22nF
CT=47nF
CT=100nF
SHUTDOWN TECHNIQUES
8
3
1k
1
Shutdown
To current
Sense resistor
Shutdown
Shutdown
UTC
UC3842A
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 caused the
output of PWM comparator 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 shutdown condition at pins 1
and/or 3 is removed . In one example, an
externally
latched
shut
–down
may
be
accomplished by adding an SCR which be reset
by cycling Vcc below the lower UVLO threshold.
At this point the reference turns off allowing the
SCR to reset.


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