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Preliminary Datasheet

Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681

Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

General Description

The AP1681 is a powerful high performance AC/DC

power supply controller for dimmable LED lighting

applications. The device uses Pulse Frequency

Modulation (PFM) technology to regulate output

current according to the wall dimmer conduct angle.

The AP1681 achieves wide dimming range without

visible flicker and is compatible with diverse

dimmers.

The AP1681 features low start-up current, low

operation current and high efficiency. It also has rich

protection functions including over voltage, short

circuit, over current and over temperature protections.

The AP1681 is available in SOIC-8 package.

Features

• Primary Side Control for Output Current

Regulation Without Opto-coupler and Secondary

CV/CC Control Circuitry

• Adjustable Full Brightness and Full Dimming

Setting

• Wide Dimming Range From 100% to 1%, Down

to Full Darkness

• Adjustable Dimming Curve for Human Eye

Sensitivity

• No Visible Flicker

• Connectivity with Analog / Digital / Hybrid

Dimming Mode

• Built-in Acceleration Start

• Adjustable Soft-start Timing

• CV Open-load Regulation and Reload Detection

• Over Voltage and Short Circuit Protection

• Over Temperature Protection

• Over Current Protection

• Maximum Switch On-time Protection

Applications

• Dimmable LED Driver Suit for Leading-edge

Dimmer, Trailing-edge Dimmer, R Type, R-C

Type or R-L Type Dimmer

Figure 1. Package Type of AP1681

SOIC-8

Summary of content (13 pages)

PAGE 1
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver General Description Features The AP1681 is a powerful high performance AC/DC power supply controller for dimmable LED lighting applications. The device uses Pulse Frequency Modulation (PFM) technology to regulate output current according to the wall dimmer conduct angle. The AP1681 achieves wide dimming range without visible flicker and is compatible with diverse dimmers.
PAGE 2
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Pin Configuration M Package (SOIC-8) DIM 1 8 VCC RD 2 7 OUT RI 3 6 GND FB 4 5 CS Figure 2. Pin Configuration of AP1681 (Top View) Pin Description Pin Number Pin Name 1 DIM Dimming control signal input 2 RD Full brightness level setting 3 RI Full dimming level setting 4 FB The feedback voltage sensing from the auxiliary winding 5 CS Primary current sensing 6 GND Ground.
PAGE 3
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Functional Block Diagram VCC 8 8V FB_OVP COMP 1.75V FB 4 COMP SHORT_OCP VCC_OVP FB_OVP OTP 0.1V Reference VCC_OVP Tonsec Detector CC_CTRL CS pro Demag COMP COMP 4V Protection & Latch FB_ACC Tons Constant Current Control CC_CTRL CV_CTRL 5 Regulator & Bias UVLO CC_ON pro COMP SHORT_OCP 4V pfm R CC_ON Driver 7 OUT Q S 0.
PAGE 4
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Ordering Information AP1681 - Circuit Type G1: Green Package M: SOIC-8 Package Temperature Range SOIC-8 -40 to 105°C TR: Tape & Reel Blank: Tube Part Number Marking ID Packing Type AP1681M-G1 1681M-G1 Tube AP1681MTR-G1 1681M-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Jul. 2011 Rev. 1.
PAGE 5
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Power Supply Voltage VCC -0.3 to 30 V Driver Output Current IOUT ±300 mA VRD, VRI, VDIM, VCS -0.3 to 7 V VFB -40 to 10 V TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10 sec) TLEAD 300 ºC Power Dissipation at TA=50°C PD 0.
PAGE 6
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Electrical Characteristics VCC =15V, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min Typ Max 16.5 19 21.5 7.2 9 10.8 1.7 10 900 1100 Unit UVLO Section Start-up Threshold Minimal Operating Voltage VTH (ST) VOPR (Min) After turn on V Standby Current Section Start-up Current IST VCC=VTH (ST)-0.
PAGE 7
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Electrical Characteristics (Continued) VCC =15V, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit 3.0 4.0 5.0 V 1.0 2 3.0 µA 1.35 1.75 2.15 V 6.5 8 9.
PAGE 8
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Typical Performance Characteristics (Continued) 2.2 940 920 Operating Current (µA) Start-up Current (µA) 2.0 1.8 1.6 900 880 860 840 820 1.4 -40 -20 0 20 40 60 80 100 800 -40 120 -20 0 20 40 60 80 100 120 o o Ambient Temperature ( C) Ambient Temperature ( C) Figure 7. Operating Current vs. Ambient Temperature Figure 6. Start-up Current vs.
PAGE 9
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Typical Performance Characteristics (Continued) 4.4 530 4.3 CV Feedback Threshold (V) Current Sense Voltage (mV) 520 510 500 490 4.1 4.0 3.9 480 470 -40 4.2 -20 0 20 40 60 80 100 3.8 -40 120 -20 0 20 40 60 80 100 120 o Ambient Temperature ( C) Ambient Temperature ( C) Figure 10. Current Sense Voltage vs. Ambient Temperature Figure 11. CV Feedback Threshold vs.
PAGE 10
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Typical Performance Characteristics (Continued) 15 14 Output Clamp Voltage (V) FB Input Leakage Current (µA) 3.0 2.5 2.0 1.5 13 12 11 1.0 -40 -20 0 20 40 60 80 100 10 20 120 22 24 26 28 30 Supply Voltage (V) o Ambient Temperature ( C) Figure 14. FB Input Leakage Current vs. Ambient Temperature Figure 15. Output Clamp Voltage vs. Supply Voltage 1.70 RD Pin Voltage (V) 1.65 1.
PAGE 11
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Typical Application EE16 L=1.43mH VREC 120Vac 60Hz 47nF Dimmer EE16 L=4.5mH ~ + ~ 115T VBUS 47k 22nF 11T 470k 1A/600V GND ZCD 560k 3N60 100pF 630V GD 47 MULT 3.3k + 6.8 F 350V CS 1nF VCC COMP INV 680k 330nF 0.47 F 2R AP1661 560k 680k 680k 16k BAV20 SR 3A/150V 220 F 35V AP1681 LED Application: 330k Dimmable LED Driver Input: 120Vac/60Hz 18W Power Output: 8 LEDs, 26VLOAD 5.
PAGE 12
Preliminary Datasheet Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681 Mechanical Dimensions Unit: mm(inch) R0.150(0.006) SOIC-8 Jul. 2011 Rev. 1.
PAGE 13
BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.