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LM3844AD Datasheet(PDF) 4 Page - HTC Korea TAEJIN Technology Co.

No. de pieza LM3844AD
Descripción Electrónicos  CURRENT MODE PWM CONTROLLER
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Fabricante Electrónico  HTC [HTC Korea TAEJIN Technology Co.]
Página de inicio  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM3844AD 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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