Document
Preliminary Datasheet
GREEN MODE PWM CONTROLLER General Description
Features
AP3102/V/L
The AP3102/V/L series is a green-mode PWM controller with low start-up current. At normal operation, the switching frequency is externally programmable and trimmed to tight range, the frequency dithering technique is also equipped to improve the EMI performance. When the load is very low or zero, the IC enters green mode and skip mode to minimize switching loss. In skip mode, the PWM switching frequency is about 20kHz to avoid the audible noise and reduce the standby loss.
The AP3102/V/L series features a lot of functions such as the Leading-Edge Blanking (LEB) of the current sensing, internal slope compensation, line compensation, and several protection functions including cycleby-cycle current limit (OCP), over voltage protection (VCC or line voltage), OTP, OLP and brownout protection.
The AP3102/V/L series provides 3 different versions with optional protection functions. AP3102 has external trigger latch shutdown only (VOVP and OLP are auto recoverable). AP3102V supports both VOVP and external latch shutdown. AP3102L provides latch shutdown control for VOVP, OLP and external trigger.
This IC is available in SOIC-8 and DIP-8 packages.
· Bi-CMOS Process with Excellent Performance · Very Low Start-up Current: 5µA typical · Current Mode Control · Non-audible-noise Green Mode Control · Frequency Foldback for High Average Efficiency · Internal Slope Compensation · Programmable Brownout Protection · Programmable Line Compensation · Useful Pin Fault Protection:
SENSE Pin Floating RI Pin Short to Ground RI Pin Floating · Smart Latch/Auto-recoverable Protection Option · Comprehensive Protection Feature: VCC Over Voltage Protection (VOVP) Line Over Voltage Protection (LOVP) Over Temperature Protection (OTP) Over Load Protection (OLP) · Internal Soft Start Function During Start-up · 500mA Gate Output Current Capability
Applications
· Switching AC-DC Adapter · LCD Monitor/TV Power · Open Frame Switching Power Supply
Jan. 2013 Rev. 1. 4
SOIC-8
DIP-8
Figure 1. Package Types of AP3102/V/L
BCD Semiconductor Manufacturing Limited 1
GREEN MODE PWM CONTROLLER Pin Configuration
M Package (SOIC-8)
GND FB
BOK RI
1 2 3 4
8 GATE 7 VCC 6 SENSE 5 ADJ
Preliminary Datasheet AP3102/V/L
P Package (DIP-8)
GND FB
1 2
BOK 3
RI 4
8 GATE 7 VCC 6 SENSE 5 ADJ
Figure 2. Pin Configuration of AP3102/V/L (Top View)
Pin Description
Pin Number 1 2
3
4 5 6 7 8
Pin Name GND FB
BOK
RI ADJ SENSE VCC GATE
Function
Signal ground. Current return for driver and control circuits
Feedback. Directly connected to the opto-coupler
Brownout Protection Pin. Connected to a resistor divider from the ground to bulk capacitor for setting the brownout level and line compensation. When the voltage of this pin is lower than 0.5V and lasts 35ms, the PWM signal will be off and system enters the auto recoverable protection mode (hiccup mode). Moreover this pin is also for the line OVP (trigger leve.