Preliminary Datasheet
PWM Controller AP3021
General Description Features
AP3021 is a constant 330kHz, voltage mode, external Voltage Mode PWM Controller
compensation boost controller. The IC has low Low Feedback Voltage: 0.2V
reference voltage which makes it ideal for low cost Fixed Frequency: 330kHz
LED backlight supplies. It can support DC dimming. DC Dimming
Low Shutdown Current: 0.1 A
AP3021 employs complete protection to ensure External Compensation
system security. The device integrates Under Voltage Built-in UVLO Function
Lockout, Over Voltage Protection, and Over Built-in OVP
Temperature Protection to protect the circuit. Built-in OTP
To satisfy the requirements for small mounting space
constraints, AP3021 is available in SOIC-8 package Applications
to save space.
LED TV
LED Monitor
LED Display Module
SOIC-8
Figure 1. Package Type of AP3021
Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
PWM Controller AP3021
Pin Configuration
M Package
(SOIC-8)
VDD 8 OUT
1
GND
EN 2 7
COMP NC
3 6
OVP
5
4
FB
Figure 2. Pin Configuration of AP3021 (Top View)
Pin Description
Pin Number Pin Name Function
Supply input pin. A capacitor should be connected between the VDD pin
1 VDD
and GND pin to keep the DC input voltage constant
Enable and dimming Pin. When EN input voltage is lower than 0.3V,
2 EN disable IC. When EN input voltage works at 0.5V to 2.4V, enable DC
dimming. When EN input voltage is higher than 2.6V, enable IC
Compensation pin. This pin is the output of the internal error amplifier.
3 COMP
COMP is forced to low when V <3.6V
DD
Feedback pin. This pin is connected to an external resistor divider to
4 FB
program the system output voltage
5 OVP Over voltage detection pin
6 NC No connection
7 GND Ground pin
Output pin, this pin is connected to external MOSFET gate to turn it
8 OUT
on/off
Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
2