Document
Preliminary Datasheet
HIGH PERFORMANCE POWER FACTOR CORRECTOR
General Description
Features
AP1661A
The AP1661A is an active power factor control IC which is designed mainly for use as pre-converter in electronic ballast, AC-DC adapters and off-line SMPS applications.
The AP1661A includes an internal start-up timer for stand-alone applications, a one-quadrant multiplier to realize near unity power factor and a zero current detector to ensure DCM boundary conduction operation. The totem pole output stage is capable of driving power MOSFET with 600mA source current and 800mA sink current.
Designed with advanced BiCMOS process, the AP1661A features low start-up current, low operation current and low power dissipation. The AP1661A also has rich protection features including over-voltage protection, input under-voltage lockout with hysteresis and multiplier output clamp to limit maximum peak current.
The AP1661A meets IEC61000-3-2 standard even at one-quadrant load and its THD is lower than 10% at high-end line voltage and full load.
· Comply with IEC61000-3-2 Standard · Proprietary Design for Minimum THD · Zero Current Detection Control for DCM Bound-
ary Conduction Mode · Adjustable Output Voltage with Precise Over-
Voltage Protection · Ultra-low Startup Current: 30µA Typical · Low Quiescent Current: 2.5mA Typical · Precision Internal Reference Voltage: 1% · Internal Startup Timer · Disable Function for Reduced Current
Consumption · Totem Pole Output with 600mA Source Current
and 800mA Sink Current Capability · Under-voltage Lockout with 2.5V of Hysteresis
Applications
· AC-DC Adapter · Off-line SMPS · Electronic Ballast
This IC is available in SOIC-8 and DIP-8 packages.
Jul. 2009 Rev. 1. 0
SOIC-8
DIP-8
Figure 1. Package Types of AP1661A BCD Semiconductor Manufacturing Limited
1
HIGH PERFORMANCE POWER FACTOR CORRECTOR Pin Configuration
Preliminary Datasheet AP1661A
M Package (SOIC-8)
INV COMP MULT
CS
1 2 3 4
8 VCC 7 GD 6 GND 5 ZCD
P Package (DIP-8)
INV 1 COMP 2 MULT 3
CS 4
8 VCC 7 GD 6 GND 5 ZCD
Figure 2. Pin Configuration of AP1661A (Top View)
Pin Description
Pin Number 1 2 3 4
5
6 7 8
Pin Name INV
COMP MULT
CS
ZCD
GND GD VCC
Function Inverting input of the error amplifier Output of the error amplifier Input of the multiplier Input of the current control loop comparator Zero current detection input. If it is connected to GND, the device is disabled Ground. Current return for gate driver and control circuits of the IC Gate driver output Supply voltage of gate driver and control circuits of the IC
Jul. 2009 Rev. 1. 0
BCD Semiconductor Manufacturing Limited 2
HIGH PERFORMANCE POWER FACTOR CORRECTOR Functional Block Diagram
Preliminary Datasheet AP1661A
INV 1
2.5V
COMP MULT 23
Multiplier
CS 4
VCC
Voltage Regulation
Over Voltage Detection
8
Internal R1 Supply 7V
RQ S
UVLO
R2 Vref
2.1V 1.6V
Zero Current Detector
Driver Starter
VCC
7 GD
5 ZCD
Disable
6 GND
Figure 3. Functional Block Diagram of AP1661A
Ordering.