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LM3842AN 参数 Datasheet PDF下载

LM3842AN图片预览
型号: LM3842AN
PDF下载: 下载PDF文件 查看货源
内容描述: 电流模式PWM控制器 [CURRENT MODE PWM CONTROLLER]
分类和应用: 控制器
文件页数/大小: 7 页 / 356 K
品牌: HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
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CURRENT MODE PWM CONTROLLER
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
Compen
sation
Voltage
Feedback
Current
Sense
R
T
/C
T
LM3842A/3A/4A/5A
8 SOP/ 8 DIP PIN Configulation
1
2
3
4
8
7
6
5
V
REF
Vcc
OUTPUT
GND
● Undervoltage lockout with hysteresis
● Low start up current :
< 0.3 mA
ORDERING INFORMATION
Device
Package
8 SOP
8 DIP
DESCRIPTION
LM3842A/3A/4A/5A D
LM3842A/3A/4A/5A N
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
V
REF
5V
Reference
V
REF
Undervoltage
Lockout
Oscillator
+
-
Vcc
Undervoltage
Lockout
R
R
RT/CT
VFB
COMP
Vcc
Latching
PWM
Output
Ground
Current
Sense
Input
Error
Amplifie
r
ABSOLUTE MAXIMUM RATINGS (T
A
= 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
V
cc
I
V
IN
I
SINK
P
D
T
stg
T
Value
30
±1
-0.3 to 5.5V
10
1
-65 to 150
260
Unit
V
A
V
mA
W
HTC
1