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LM3842A Datasheet(PDF) 6 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
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LM3842A Datasheet(HTML) 6 Page - HTC Korea TAEJIN Technology Co.

   
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CURRENT MODE PWM CONTROLLER
Fig.1 Output Dead Time
Fig.2 Timing Resistor vs Frequency
Fig.3 Output Saturation Characteristics
Fig.4 Error Amplifier Open Loop
Gain and Phase Frequency
PIN FUNCTION DESCRIPTION
Pin No.
Function
Description
1
Compensation This pin is the Error Amplifier output and is made available for loop
compensation.
2
Voltage
This is the inverting input of the Error Amplitier.
It is normally connected
Feedback
to the switching power supply output through a resister divider.
3
Current Sense
A voltage proportional to inductor current is connected to this input.
The PWM uses this information to terminate the output switch conduction.
4
RT/CT
The Oscillator frequency and maximum Output duty cycle are
programmed by connecting resistor RT to VREF and capacitor CT
to ground. Operation to 500kHz is possible.
5
GND
This pin is the combined control circuitry and power ground.
6
Output
This output directly drives the gate of a power MOSFET. Peak currents
up to 1.0A are sourced and sunk by this pin.
7
Vcc
This pin is the positive supply of the control IC.
8
VREF
This is the reference output. It provides charging current for capacitor
CT through resistor RT.
HTC
6
LM3842A/3A/4A/5A
10
-3
24
6 8 10-1
24
8
6
4
2
0
1
3
SINK (VOL)
VCC=15V
TA=25℃
SOURCE (V
CC-VOH)
Io, Output Load Current (A)
80
50
20
8.0
5.0
1.0M
2.0
0.8
10k
20k
50k100k
500k
200k
fosc, Frequency (kHz)
CT=10nF
CT=5.0nF
CT=2.0nF
CT=1.0nF
CT=500pF
CT=200pF
CT=100pF
100
30
10
3
1M
100k
10k
1k
100
fosc, Frequency(Hz)
CT=100nF
CT=47nF
CT=22nF
CT=10nF
CT=4.7nF
CT=2.2nF
CT=10nF
80
60
40
10K 100K
1M
1K
100
0
-135
10
-180
0
-45
20
Fosc, Frequency (Hz)
-90
10M
Gain
Phase


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