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LM3842A Datasheet(PDF) 4 Page - HTC Korea TAEJIN Technology Co.

Part No. LM3842A
Description  CURRENT MODE PWM CONTROLLER
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Maker  HTC [HTC Korea TAEJIN Technology Co.]
Homepage  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM3842A Datasheet(HTML) 4 Page - HTC Korea TAEJIN Technology Co.

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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
Fig.4 Current Sense Circuit
Peak current (IS) is determined by the formula:
IS(MAX)
A small RC filter may be required to suppress switch transients.
Fig.5 Oscillator Waveforms and Maximum Duty Cycle
Oscillator timing capacitor, CT, is charged by VREF through RT, and discharged by an internal
current source.
During the discharge time, the internal clock signal blanks the output to the
low state. Selection of RT and CT therefore determines both oscillator frequency and maximum
duty cycle. Charge and discharge times are determined by the formulas:
tc
0.55 RT CT
td
RT CT ∫n(
)
Frequency, then, is: f = (tc + td)
-1
For RT>5KΩ, f
HTC
4
1
3
5
IS
ERROR
AMP
2R
R
1V
CURRENT
SENSE
COMPARATOR
COMP
CURRENT
SENSE
GND
C
RS
R
~
~
1.0V
RS
~
~
0.0063 RT - 2.7
0.0063 RT - 4
~
~
1.8
RT CT
~
~
8
4
5
VREF
RT/CT
GND
LARGE RT
SMALL CT
V4
INTERNAL CLOCK
LARGE RT
SMALL CT
V4
INTERNAL CLOCK
RT
CT


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