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LM3842A датащи(PDF) 3 Page - HTC Korea TAEJIN Technology Co.

номер детали LM3842A
подробное описание детали  CURRENT MODE PWM CONTROLLER
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производитель  HTC [HTC Korea TAEJIN Technology Co.]
домашняя страница  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM3842A датащи(HTML) 3 Page - HTC Korea TAEJIN Technology Co.

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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
Note: 1. Adjust Vcc above the start threshould before setting at 15V.
2. Parameter measured at trip point of latch with VFB - 0.
3. Comparator Gain defined as:
Fig.1 Open Loop Test Circuit
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 5KΩ potentiometer are used to sample the oscillator waveform and apply an
adjustable ramp to pin 3.
Fig.2 Under Voltage Lockout
LM3842A
LM3843/5A
VON
16V
8.4V
VOFF
10V
7.6V
During Under-Voltage Lock-Out, the output driver is biased to a high impedance state.
Pin 6 should be shunted to ground with a bleeder resistor to prevent activating the power switch
with output leakage current.
HTC
3 −
ΔV Output Compensation(pin FB)
ΔV Current Sanseinput(pin CS)
A
=
;
1
2
3
4
8
7
6
5
COMP
VREF
VFB
VC
OUTPUT
GND
ISENSE
RT/CT
LM3842A
0.1
0.1
A
CT
OUTPUT
1K/1W
VREF
V1
RT
100K
2N
2222
4.7K
E/A
ADJUST
1K
5K
ISENSE
ADJUST
4.7K
7
ON/OFF COMMAND
TO REST OF IC
< 15mA
< 1mA
VOFF VON
VCC
ICC


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