Diodes AP1681 User Manual

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

Preliminary Datasheet

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 an d 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

SOIC-8

Figure 1. Package Type of AP1681

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

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Preliminary Datasheet

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

Pin Configuration

M Package

(SOIC-8)

DIM

RD

8

1

2

VCC

7

OUT

RI

FB

3

4

GND

6

5

CS

Figure 2. Pin Configuration of AP1681 (Top View)

Pin Description

Pin Number Pin Name Function

1

2

3

4

DIM Dimming control signal input

RD Full brightness level setting

RI Full dimming level setting

FB The feedback voltage sensing from the auxiliary winding

5

6

7

8

CS Primary current sensing

GND Ground. Current return for gate driver and control circuits of the IC

OUT Gate driver output

VCC Supply voltage of gate driver and control circuits of the IC

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

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Preliminary Datasheet

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

Functional Block Diagram

VCC

8

FB_OVP8V

COMP

FB

SHORT_OCP

1.75V

4

0.1V

4V

COMP

COMP

COMP

FB_ACC

Demag

CC_CTRL

CV_CTRL

VCC_OVP

FB_OVP

OTP

Tonsec

Detector

Protection

& Latch

Tons

CC_CTRL

pro

Constant

Current
Control

VCC_OVP

CC_ON

Regulator

&

Bias

Reference

UVLO

CS

DIM

5

COMP

4V

0.5V

1

COMP

SHORT_OCP

PEAK_CTRL

Dimming Control

23

RD

RI

CC_ON

R

Q

S

Q

S

R

Figure 3. Functional Block Diagram of AP1681

pro

CC_CTRL

pfm

Driver

6

7

OUT

GND

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

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Preliminary Datasheet

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

Ordering Information

AP1681 -

Package

Circuit Type

Package

M: SOIC-8

Temperature

Range

Part Number Marking ID Packing Type

G1: Green

TR: Tape & Reel
Blank: Tube

SOIC-8

-40 to 105°C

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. 2 BCD Semiconductor Manufacturing Limited

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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
Driver Output Current I

Voltage at RD, RI, DIM, CS
FB Input Voltage

Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10 sec) T
Power Dissipation at TA=50°C

Thermal Resistance
(Junction-to-Ambient)

ESD (Machine Model) 200 V
ESD (Human Body Model) 4000 V

V

CC

±300 mA

OUT

V

, VRI,

RD

V

, VCS

DIM

V

FB

-65 to 150 ºC

STG

300 ºC

LEAD

0.65 W

P

D

θ

JA

-0.3 to 30 V

-0.3 to 7 V

-40 to 10 V

150

°C/W

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Power Supply Voltage

Ambient Temperature TA -40 105 ºC

10.8 21.5 V

V

CC

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

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Preliminary Datasheet

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

Electrical Characteristics

V

=15V, TA=25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

UVLO Section

Start-up Threshold VTH (ST) 16.5 19 21.5
Minimal Operating Voltage V

(Min) After turn on 7.2 9 10.8

OPR

Standby Curr ent Section
Start-up Current IST

V
Before start up

CC=VTH

(ST)-0.5V,

1.7 10

Operating Current ICC Static 700 900 1100

V

µA

Drive Output Section

=12V

=20mA

=12V

=20V
=0 to V

=10mA

=20mA

=5mA

CC–ON

8 V

1 V

11 13 15 V

1 V

µs

I

Output High Level Voltage VOH

Output Low Level Voltage VOL
Output Voltage Rise Time tR C

Output Voltage Fall Time tF C
Output Clamp Vo ltage V

UVLO Saturation Voltage V
Maximum Switch On-time t

O-CLAMP

UVLO

ONP_MAX

GD-SOURCE

V

CC

I

GD-SINK

V

CC

=1nF 120 220 320 ns

L

=1nF 30 50 90 ns

L

I

GD-SOURCE

V

CC

V
I

SINK

CC

16.5

DIM Input Section

Voltage Gain to RI

∆V

RI

/∆V

DIM

Internal Source Current 11 20 35

-1.2 -1.1 -1.0
µA

Reload Threshold 0.8 1 1.25 V
RD and RI Section
RD Pin Voltage VRD 1.3 1.5 1.75 V
Maximum RD Current

150

µA

Maximum RI Current

250

µA

Current Sense Section

Current Sense Voltage VCS 450 500 560 mV
Maximum CS Current V

=0 120

DIM

µA

Leading Edge Blanking 600 ns

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

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Preliminary Datasheet

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

Electrical Characteristics (Continued)

V

=15V, TA=25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

Feedback Input Section

CV Feedback Threshold V
FB Pin Input Leakage

Current
Acceleration Start
Threshold

Over Voltage Protection V

3.0 4.0 5.0 V

FB-CV

V

I

FB

=4V 1.0 2 3.0

FB

µA

1.35 1.75 2.15 V

6.5 8 9.5 V

FB-OVP

Over Temperatur e Protection Section
Shutdown Temperature 140
Temperature Hysteresis 20

o

C

o

C

Typical Performance Characteristics

19.0

18.8

18.6

18.4

Start-up Voltage (V)

18.2

18.0

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Figure 4. Start-up Voltage vs. Ambient Temperature Figure 5. Minimal Operating Voltage vs.

10.0

9.5

9.0

Minimal Operating Voltage (V)

8.5

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Ambient Temperature

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

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Preliminary Datasheet

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

Typical Performance Characteristics (Continued)

2.2

2.0

1.8

Start-up Current (µA)

1.6

940

920

900

880

860

840

Operating Current (µA)

820

1.4

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

800

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Figure 6. Start-up Current vs. Ambient Temperature

Figure 7. Operating Current vs. Ambient Temperature

1000

900

800

700

600

500

400

300

Operating Current (µA)

200

100

0

0 5 10 15 20 25 30

Supply Voltage (V)

Figure 8. Operating Current vs. Supply Voltage Figure 9. Current Sense Voltage vs. Supply Voltage

540

520

500

480

Current Sense Voltage (mV)

460

20 22 24 26 28 30

Supply Voltage (V)

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

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Preliminary Datasheet

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

Typical Performance Characteristics (Continued)

530

520

510

500

490

Current Sense Voltage (mV)

480

470

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Figure 10. Current Sense Voltage vs.

Ambient Temperature Ambient Temperature

4.3

4.2

4.1

4.0

3.9

3.8

CV Feedback Threshold (V)

3.7

3.6
20 22 24 26 28 30

Figure 12. CV Feedback Threshold vs. Figure 13. Over Voltage Protection vs.

Supply Voltage

Supply Voltage (V)

4.4

4.3

4.2

4.1

4.0

CV Feedback Threshold (V)

3.9

3.8

-40-200 20406080100120

Ambient Temperature (oC)

Figure 11. CV Feedback Threshold vs.

9.0

8.9

8.8

8.7

8.6

8.5

8.4

8.3

Over Voltage Protection (V)

8.2

8.1

8.0

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Ambient Temperature

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

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Preliminary Datasheet

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

Typical Performance Characteristics (Continued)

3.0

15

2.5

2.0

1.5

FB Input Leakage Current (µA)

1.0

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

Figure 14. FB Input Leakage Current vs. Figure 15. Output Clamp Voltage vs.

Ambient Temperature Supply Voltage

14

13

12

Output Clamp Voltage (V)

11

10

20 22 24 26 28 30

Supply Voltage (V)

1.70

1.65

1.60

1.55

RD Pin Voltage (V)

1.50

1.45

-40-200 20406080100120

Ambient Temperature (oC)

Figure 16. RD Pin Voltage vs. Ambient Temperature

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

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Preliminary Datasheet

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

Typical Application

COMP

EE16

L=1.43mH

47k

ZCD

GD

CS

INV

AP1661

115T

11T

47

3N60

V

BUS

+

100pF

2R

630V

6.8 F
350V

120Vac

60Hz

Dimmer

EE16

L=4.5mH

47nF

~
~

1A/600V

V

REC

+

22nF

470k

560k

3.3k

1nF

GND

MULT

VCC

560k

AP1681 LED Application:

Dimmable LED Driver

Input: 120Vac/60Hz

18W Power

Output: 8 LEDs, 26V

5.0mA to 550mA
32 V

OPEN

LOAD

680k

220k

270k

1

F

330k 330k

100k

16k

0.47

0.47

F

0.47

F

VCC

DIM

F

RD

51k 100k

BAV20

BAV20

RI

47k

FB

OUT

CS

GND

330nF

14T

=0.3

φ

10k

AP1681

16k

2.2nF
630V

Figure 17. Typical Application of AP1681

100

3.0k

680k

68k

680k

0.16

FR105

95T

×3

SR

3A/150V

19T

=0.4

φ

TIW

EF20

L=2.54mH

4N60

1.3R

220

F

35V

+

Y2

1.5nF 3kV

27k

V

OUT

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

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Preliminary Datasheet

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

Mechanical Dimensions

SOIC-8 Unit: mm(inch)

R0.150(0.006)

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

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BCD Semiconductor Manufacturing Limited

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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

other rights nor the rights of others.

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