Diodes AP1686 User Manual

Low-Power Off-line PSR LED Controller AP1686

Preliminary Datasheet

General Description

The AP1686 is a high performance AC/DC power
supply controller for LED lighting application. The
device uses Pulse Frequency Modulation (PFM)
method to build discontinuous conduction mode
(DCM) flyback power supplies.

The AP1686 provides accurate constant voltage,
constant current (CV/CC) regulation without
requiring an opto-coupler and the secondary control
circuitry. It also eliminates the need of loop
compensation circuitry while maintaining good
stability. The AP1686 can achieve excellent
regulation and high average efficiency, yet meets
no-load consumption less than 30mW.

It also has an adjustable built-in line compensation
function to achieve tight CC.

The AP1686 is available in SOT-23-6 package.

Features

• Primary Side Control for Tight Constant Current
and Constant Voltage

• 30mW No-load Input Power

• Bipolar Junction Transistor (BJT) Driving

• Open Circuit Protection

• Over Voltage Protection

• Short Circuit Protection

• SOT-23-6 Package

Applications

• LED Driver

Figure 1. Package Type of AP1686

SOT-23-6

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Pin Configuration

K6 Package

(SOT-23-6)

Pin 1 Mark

1

2

34

6

5

Figure 2. Pin Configuration of AP1686 (Top View)

Pin Description

Pin Number Pin Name Function

The OUT pin is used to turn on and turn off the power switch. When
turning on the power switch, the OUT pin will output 30mA source

1 OUT

2, 5 GND

3 VCC

4 CS

6 FB

current to support the base current of the power BJT. When turning
off the power switch, the resistance between the OUT and GND will
become to 5Ω
The GND pin is the ground of the IC. When the power BJT is turned
off, a fast reverse sinking current to the gate of BJT will flow out
from this pin. Attention should be paid to in the PCB layout
The VCC pin supplies the power for the IC. In order to get the
correct operation of the IC, a capacitor with low ESR should be
placed as close as possible to the VCC pin
The CS is the current sense pin of the IC. The IC will turn off the
power BJT according to the voltage on the CS pin. When the power
BJT is on, a current is output from the CS pin which is proportional
to the line voltage to realize the function of line compensation
The CV and CC regulation are realized based on the voltage
sampling of this pin

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Functional Block Diagram

VCC

3

FB

UVLO

6

0.1V

COMP

PFM

OVP

&

OCKP

Tonsec

Detector

PRO

T

ONS

Regulator

&

Bias

UVLO

CS

V

FB

Line

Compensation

4

T

ONS

Constant Voltage

EA

V

REF1

V

REF2

Constant Current

Control

Control

Peak Current

Control & LEB

Q

R

S

Shutdown

Pre_Shutdown

Q

R

S

Pro

CV_
CC_

CC_ctrl

ctrl
ctrl

PFM

Driver

2,5

1

OUT

GND

Figure 3. Functional Block Diagram of AP1686

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Ordering Information

AP1686 -

Circuit Type

G1: Green

Package
K6: SOT-23-6

TR: Tape & Reel

Package

SOT-23-6

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.

Temperature

Range

-40 to 85°C

Part Number Marking ID Packing Type

AP1686K6TR-G1 GBQ Tape & Reel

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Voltage VCC -0.3 to 30 V
CS to GND Voltage -0.3 to 7 V
FB Input Voltage VFB -40 to 7.5 V
Source Current at OUT Pin I
Operating Junction Temperature TJ 150 ºC
Storage Temperature T

Lead Temperature (Soldering, 10
sec)
Thermal Resistance (Junction to
Ambient)

ESD (Human Body Model) 2000 V

 Internally Limited A

SOURCE

-65 to 150 ºC

STG

T

300 ºC

LEAD

θ

JA

200 ºC/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.

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Electrical Characteristics

V

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

CC

Parameter Symbol Conditions Min Typ Max Unit

UVLO SECTION

Startup Threshold VTH (ST) 13 15.5 18
Minimal Operating Voltage V
STANDBY CURRENT SECTION

Startup Current IST
Operating Current ICC(OPR) Static current 250 400 600

DRIVE OUTPUT SECTION
Output Current
CURRENT SENSE SECTION

Current Sense Threshold
Voltage
Equivalent Current Sense
Voltage Accuracy (Note 2)

Leading Edge Blanking t

FEEDBACK INPUT SECTION

Input Resistance of FB Pin RFB VFB=4V 1 1.6 2
Feedback Threshold VFB 3.7 3.974 4.21 V
LINE COMPENSATION SECTION

Line Compensation
Transconductance (Note 2)

PROTECTION SECTION
Over Voltage Protection VFB(OVP) 6.5 7.5 8.5 V

Maximum On Time of
Primary Side

Note 2: The output current is given by

Sink I
Source I

(MIN) 3 3.5 4.5

OPR

V

CC=VTH

Before startup

Apply 1V @OUT pin 200 300 500 mA

SINK

24 30 45 mA

SOURCE

V

440 500 550 mV

CS

eqVcs,,Δ

eqVcs

The minimum power

LEB

g

m

tonp

(MAX)

switch turn on time

1.14 1.43 1.72

11 18 50

I

OUT

Rcs

eqVcs

,

(ST)-1V,

4 %

Np

×=

0 0.2 0.6

300 475 720 ns

Ns

V
V

μA

MΩ

μS

μs

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Typical Performance Characteristics

800

700

600

40

35

500

400

300

Operating Current (μA)

200

100

10 15 20 25 30

Supply Voltage (V)

30

Source Current (mA)

25

20

10 15 20 25 30

Supply Voltage (V)

Figure 4. Operating Current vs. Supply Voltage Figure 5. Source Current vs. Supply Voltage

5.0

500

4.5

4.0

3.5

450

400

3.0

Minimal Operating Voltage (V)

2.5

2.0

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Operating Current (μA)

350

300

-40-200 20406080100120140

Ambient Temperature (oC)

Figure 6. Minimal Operating Voltage vs.

Ambient Temperature

Figure 7. Operating Current vs.

Ambient Temperature

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Typical Performance Characteristics (Continued)

Start-up Current (μA)

3.0

2.5

2.0

1.5

1.0

0.5

0.0

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

18

17

16

15

Start-up Voltage (V)

14

13

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Figure 8. Start-up Current vs. Ambient Temperature

Figure 9. Start-up Voltage vs. Ambient Temperature

2.00

1.75

1.50

1.25

FB Input Resistance (MΩ)

1.00

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Source Current (mA)

Figure 10. FB Input Resistance

vs. Ambient Temperature

50

45

40

35

30

25

20

15

10

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Figure 11. Source Current

vs. Ambient Temperature

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Typical Performance Characteristics (Continued)

600

550

500

450

40

30

20

400

Current Sense Voltage (mV)

350

300

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Figure 12. Current Sense Voltage vs.

Ambient Temperature

800

750
700
650
600
550

LEB (ns)

500

450
400

350
300

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

10

Primary Side Maximum On Time ( μs)

0

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

Figure 13. Primary Side Maximum On Time

vs. Ambient Temperature

Figure 14. LEB vs. Ambient Temperature

Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Typical Application

T1

+

R1

C1

R2

4

CS

VCC

+

D1

C2

3

1

OUT

Q1

Np

Na

R6

D2

+

Ns

C4

R10

VO+

V

-

O

AP1686

6

FB

GND

2,5

R

LINE

R7

Rs

Figure 15. Typical LED Driver Application

Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Low-Power Off-line PSR LED Controller AP1686

Mechanical Dimensions

SOT-23-6 Unit: mm(inch)

0°
8°

0.200(0.008)

0.300(0.012)

0.400(0.016)

6

2.820(0.111)

3.020(0.119)

5

0.300(0.012)

0.600(0.024)

4

2.650(0.104)

2.950(0.116)

0.950(0.037)TYP

Pin 1 Mark

123

1.800(0.071)

2.000(0.079)

1.500(0.059)

1.700(0.067)

0.700(0.028)REF

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

0.100(0.004)

0.200(0.008)

1.450(0.057)
MAX

Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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