LM3842A View Datasheet(PDF) - HTC Korea
Part Name
Description
Manufacturer
LM3842A Datasheet PDF : 6 Pages
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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
FEATURES
8 SOP/ 8 DIP PIN Configulation
● 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
SOP-8 PKG
DIP-8 PKG
Compen
sation 1
Voltage
Feedback
2
Current 3
Sense
RT/CT 4
8 VREF
7 Vcc
6 OUTPUT
5 GND
● Low start up current :＜ 0.3 mA
● Moisture Sensitivity Level 3
ORDERING INFORMATION
Device
Package
LM3842A/3A/4A/5A D
8 SOP
DESCRIPTION
LM3842A/3A/4A/5A N
8 DIP
The LM384xA are fixed frequency current-mode PWM controller. They are specially designed for Off-Line and
DC-to-DC converter applications with minimal external components.
These integrated circuits 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
VREF ⑧
RT/CT ④
VFB ②
COMP ①
5V
Reference
R
VREF
R
Undervoltage
Lockout
Vcc
Undervoltage
Lockout
Oscillator
+
-
Error
Amplifie
r
Latching
PWM
ABSOLUTE MAXIMUM RATINGS (TA= 25℃)
Characteristic
Power Supply Voltage
Output Current
Analog Inputes Voltage
Error Amp Output Sink Current
Power Dissipation
Storage Temperature Range
Lead Temperature (soldering 5 sec)
Symbol
Vcc
Io
VIN
ISINK
PD
Tstg
TL
2008 - Ver. 1.0
−1−
Value
30
±1
-0.3 to 5.5V
10
1
-65 to 150
260
⑦ Vcc
⑥ Output
⑤ Ground
③ Current
Sense
Input
Unit
V
A
V
mA
W
℃
℃
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