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LM3842A Datasheet(PDF) 1 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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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
FEATURES
● Automatic feed forward compensation
● Optimized for offline converter
● Double pulse suppression
● Current mode operation to 500 KHz
● High gain totem pole output
● Internally trimmed bandgap reference
● Undervoltage lockout with hysteresis
● Low start up current :< 0.3 mA
ORDERING INFORMATION
Device
Package
DESCRIPTION
LM3842A/3A/4A/5A D
8 SOP
LM3842A/3A/4A/5A N
8 DIP
The LM3842A is fixed frequency current-mode PWM controller.
It is specially designed for Off-Line and
DC-to-DC converter applications with minimal external components.
This integrated circuit features a trimmed oscillator for precise duty cycle control, a temperature
compensated reference, high gain error amplifier, current sensing comparator, and a high current
totempole output ideally suited for driving a power MOSFET.
Protection circuitry includes built in under-voltage lockout and current limiting.
SIMPLIFIED BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS (TA= 25℃)
Characteristic
Symbol
Value
Unit
Power Supply Voltage
Vcc
30
V
Output Current
I
± 1
A
Analog Inputes Voltage
VIN
-0.3 to 5.5V
V
Error Amp Output Sink Current
ISINK
10
mA
Power Dissipation
PD
1
W
Storage Temperature RangeTstg
-65 to 150
Lead Temperature (soldering 5 sec)
T
260
HTC
1
5V
Reference
Vcc
Undervoltage
Lockout
Latching
PWM
Oscillator
VREF
Undervoltage
Lockout
+
-
Vcc
Output
Ground
Current
Sense
Input
VREF
RT/CT
VFB
COMP
Error
Amplifie
r
R
R
1
2
3
4
8
7
6
5
Voltage
Feedback
Current
Sense
RT/CT
Vcc
OUTPUT
GND
VREF
Compen
sation
8 SOP/ 8 DIP PIN Configulation




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