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參數(shù)資料
| 型號(hào)： | LM3845AN |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 1/7頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | LM3845AN |
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 (T
A
= 25℃)
Characteristic
Symbol
V
cc
I
V
IN
I
SINK
P
D
T
stg
T
Value
30
± 1
Unit
V
A
V
mA
W
℃
℃
Power Supply Voltage
Output Current
Analog Inputes Voltage
Error Amp Output Sink Current
Power Dissipation
Storage Temperature Range
Lead Temperature (soldering 5 sec)
-0.3 to 5.5V
10
1
-65 to 150
260
HTC
1
5V
Reference
Vcc
Undervoltage
Lockout
Latching
PWM
Oscillator
V
REF
Undervoltage
Lockout
-
+
⑦
Vcc
⑥
Output
⑤
Ground
③
Current
Sense
Input
V
REF
⑧
RT/CT
④
VFB
②
COMP
①
Error
Amplifie
r
R
R
1
2
3
4
8
7
6
5
Voltage
Feedback
Current
Sense
R
T
/C
T
Vcc
OUTPUT
GND
V
REF
Compen
sation
8 SOP/ 8 DIP PIN Configulation
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