AP3021

Preliminary Datasheet PWM Controller AP3021 General Description AP3021 is a constant 330kHz, voltage mode, external compensation boost controller. The IC has low reference voltage which makes it ideal for low cost LED backlight supplies. It can support DC dimming. AP3021 employs complete protection to ensure system security. The device integrates Under Voltage Lockout, Over Voltage Protection, and Over Temperature Protection to protect the circuit. To satisfy the requirements for small mounting space constraints, AP3021 is available in SOIC-8 package to save space. Features Voltage Mode PWM Controller Low Feedback Voltage: 0.2V Fixed Frequency: 330kHz DC Dimming Low Shutdown Current: 0.1µA External Compensation Built-in UVLO Function Built-in OVP Built-in OTP Applications LED TV LED Monitor LED Display Module SOIC-8 Figure 1. Package Type of AP3021 Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 1 PWM Controller Pin Configuration Preliminary Datasheet AP3021 M Package (SOIC-8) VDD 1 EN 2 COMP 3 FB 4 8 OUT 7 GND 6 NC 5 OVP Figure 2. Pin Configuration of AP3021 (Top View) Pin Description Pin Number 1 2 3 4 5 6 7 8 Pin Name VDD EN COMP FB OVP NC GND OUT Function Supply input pin. A capacitor should be connected between the VDD pin and GND pin to keep the DC input voltage constant Enable and dimming Pin. When EN input voltage is lower than 0.3V, disable IC. When EN input voltage works at 0.5V to 2.4V, enable DC dimming. When EN ...