AP384XC Datasheet, PDF (2/14 Pages) BCD Semiconductor Manufacturing Limited – CURRENT MODE PWM CONTROLLER

CURRENT MODE PWM CONTROLLER
Pin Configuration
M Package
(SOIC-8)
COMP 1
V_FB 2
I_SENSE 3
R_T/C_{T 4}
8 V_REF
7 V_CC
6 OUTPUT
5 GND
Data Sheet
AP384XC
P Package
(DIP-8)
COMP 1
V_{FB 2}
I_SENSE 3
R_T/C_T 4
8 V_REF
7 ^VCC
6 ^OUTPUT
5 GND
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
V_FB
I_SENSE
R_T/C_T
GND
OUTPUT
V_CC
V_REF
Function
This pin is the Error Amplifier output and is made available for loop compensation.
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
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.
The combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sunk by this pin.
The positive supply of the control IC.
This is the reference output. It provides charging current for capacitor C_T through
resistor R_T.
Jul. 2013 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
2