參數資料
型號: 3843CMTR-E1
廠商: BCD Semiconductor Manufacturing Limited
英文描述: CURRENT MODE PWM CONTROLLER
中文描述: 電流模式PWM控制器
文件頁數: 2/13頁
文件大?。?/td> 188K
代理商: 3843CMTR-E1
CURRENT MODE PWM CONTROLLER AP384XC
Data Sheet
2
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Pin Configuration
Pin Description
Pin Number
Pin Name
Function
1
COMP
This pin is the Error Amplifier output and is made available for loop compensation.
2
V
FB
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
3
I
SENSE
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
4
R
T
/C
T
The Oscillator frequency and maximum output duty cycle are programmed by con-
necting resistor R
T
to V
REF
and capacitor C
T
to ground. Operation to 500 kHz is possi-
ble.
5
GND
The combined control circuitry and power ground.
6
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sunk by this pin.
7
V
CC
The positive supply of the control IC.
8
V
REF
This is the reference output. It provides charging current for capacitor C
T
through
resistor R
T
.
P/M Package
(DIP-8/SOIC-8)
COMP
I
SENSE
R
T
/C
T
V
FB
8 V
REF
7 V
CC
6 OUTPUT
5 GND
1
2
3
4
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