Diodes AP3608E User Manual

Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

General Description

The AP3608E is an eight-channel constant current sink
with current match used for LED driver. It uses an
external resistor to set the current for eight LED strings
with an accuracy of ±1.5%. The full scale LED current
can be adjusted from 10mA to 100mA for each chan­nel. The LED light can be adjusted by PWM dimming
function.

The device can keep working when LED opens with­out damage. It features under voltage lockout protec­tion and over temperature protection.

The AP3608E has four interface terminals (FB, SDB,
FBX and SDBX pins). The first two terminals allow
the device to work with a DC/DC converter to drive
LED arrays for good performance. And the other two
enable the device to be connected in parallel.

The AP3608E is available in QFN-4
20(EDP) and SOIC-20 packages.

×4-24, TSSOP-

Features

· Input Voltage Range: 4.2V to 5.5V

· Typical Output Current: 480mA (60mA/1V per

Channel)

· Maximum Output Current: 800mA (100mA/1.5V

per Channel)

· Current Match Accuracy: ±1.5%

· PWM Dimming Control

· Open LED Self-check and Protection

· Under Voltage Lockout Protection

· Over Temperature Protection

· FBX and SDBX Pins Enable Parallel Application

Applications

· Notebook

· LCD Display Modules

· LCD Monitor

· LCD TV

QFN-4×4-24 TSSOP-20(EDP) SOIC-20

Figure 1. Package Types of AP3608E

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Pin Configuration

FN Package

(QFN-4×4-24)

Pin 1 Dot by Marking

CH2 CH3 CH4 CH5 CH6

1

CH1

2

NC

3

NC

NC

PWM

NC

4

5

6

NC

Exposed

Pad

78 9101112

ISET FB SDB

G/M Package

(TSSOP-20(EDP)/SOIC-20)

CH1

1

CH2

2

CH3

3

CH4

4

PGND

1920212224 23

18

CH7

17

CH8

16

EN

15

VCC

AGND

14

NC

13

SDBXFBX

EN

20

VCC

19

AGND

18

SDBX

17

PGND

PGND

Note: AGND must be quiet and directly connected to total C

CH5

CH6

CH7

CH8

5

6

7

8

9

10

16

15

14

13

12

11

SDB

FB

ISET

FBX

NC

PWM

IN

Figure 2. Pin Configuration of AP3608E (Top View)

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Pin Description

Pin Number

QFN-4

1, 24, 23, 22,

20, 19, 18, 17

2 ,3 ,4, 6, 7, 13 12 NC No connection

511PWM

813FBX

914ISET

10 15 FB

11 16 SDB

12 17 SDBX

14 18 AGND

TSSOP-20(EDP)/

×4-24

SOIC-20

1, 2, 3, 4, 7, 8, 9, 10 CH1to CH8 White LED cathode connection pin. These pins should be connected to

Pin Name Function

GND if not used

PWM dimming control pin. Adding a PWM signal to this pin to control
LED dimming (see Figure 10 for detail dimming control mode). If not
used, connect it to the high level

This pin is an interface terminal. Connecting it with FB pin can achieve
parallel application. If not used, leave it unconnected

LED current set pin. An external resistor is connected to this pin to set
each channel current according to I

Feedback pin. This pin is an interface terminal, which samples the volt­age of each channel, and outputs the lowest voltage of the string to DC/
DC converter

This pin is an interface terminal. SDB pin outputs low logic to DC/DC
converter under the conditions such as AP3608E receives shutdown sig­nal from EN pin or all channels are inactive. When AP3608E is on
PWM dimming mode, the signal in SDB pin is synchoronous with PWM
signal

This pin is an interface terminal. Connecting it with SDB pin can
achieve parallel application. If not used, connect it to GND

Ground pin. It would be useful when connected with PGND and
exposed pad

CHANNEL

=1.194*400/R

ISET

15 19 VCC Input voltage pin

16 20 EN Enable pin. Logic high enables the IC and logic low disables the IC

21 5, 6 PGND

EP

Ground pin. It would be useful when connected with AGND and
exposed pad

Exposed pad. It would be useful when connected with AGND and
PGND

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Functional Block Diagram

EN

SDB

SDBX

ISET

PWM

16

(20)

11

(16)

12

(17)

9 (14)

5 (11)

VCC

EN

Logic

Disable

or

All STG

or

Synchronous

with PWM

Signal

V

REF

PWM Dimming

Bandgap

OPA

+

100mV

100mV

4

CH1...CH8

Test

DFF

V

CC

OTP

8

EN

GND

14, 21 (5, 6, 18)15 (19)

EN

UVLO

V

REF

Time

Out

STG

(Short To GND)

3V

COMP

Max.(CH1...CH8)

Min.(CH1...CH8,FBx)

CH3CH4CH5CH6CH7CH8

8

100:1

EN

V

CC

1

6

8

CH1...CH8

8 (13)

(15)

CH2

CH1

1 (1)

FBX

10

FB

CH1

Current Sink

24
(2)

Current Sink

Current Sink

Current Sink

Current Sink

Current Sink

Current Sink

Current Sink

23
(3)

22
(4)

20
(7)

19
(8)

18
(9)

17

(10)

CH2

CH3

CH4

CH5

CH6

CH7

CH8

A (B)
A for QFN-4

×4-24

B for TSSOP-20(EDP)/SOIC-20

Figure 3. Functional Block Diagram of AP3608E

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Ordering Information

AP3608E -

Circuit Type

Package

FN: QFN-4

×4-24

G1: Green

TR: Tape and Reel
Blank: Tube

G: TSSOP-20(EDP)
M: SOIC-20

Package Temperature Range Part Number Marking ID Packing Type

QFN-4×4-24

TSSOP-20(EDP) AP3608EGTR-G1 AP3608EG-G1 Tape & Reel

SOIC-20

-40 to 85

o

C

AP3608EFNTR-G1 B3B Tape & Reel

AP3608EM-G1 AP3608EM-G1 Tube

AP3608EMTR-G1 AP3608EM-G1 Tape & Reel

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

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage V

ISET Pin Voltage V

EN Pin Voltage V

Feedback Pin Voltage V

SDB Pin Voltage V

PWM Pin Voltage V

Voltage per Channel (Note 3) V

CC

ISET

EN

FB

SDB

PWM

CHX

QFN-4×4-24 60
Thermal Resistance
(Junction to Ambient, No Heat Sink)

θ

JA

TSSOP-20(EDP) 35 (Note 2)

SOIC-20 87

Operating Junction Temperature T

Storage Temperature Range T

Lead Temperature (Soldering, 10sec) T

J

STG

LEAD

ESD (Machine Model) 200 V

ESD (Human Body Model) 6000 V

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.

Note 2: The chip is soldered to 60mm2 (4mm×15mm) copper (top side solder mask) of 1oz. on PCB with 8×0.5mm vias.
Note 3: Breakdown voltage.

-0.3 to 6 V

-0.3 to 6 V

-0.3 to 6 V

-0.3 to 6 V

-0.3 to 6 V

-0.3 to 6 V

-0.3 to 40 V

o

150

-65 to 150

260

C/W

o

C

o

C

o

C

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Recommended Operating Conditions

Parameter Symbol Min Max Unit

V

Input Voltage

Recommended PWM Dimming Frequency f

Full Scale Setting Current per Channel

≥0.5V

V

CHX

≥1V 10 65

V

CHX

V

≥1.5V 10 110

CHX

Operating Temperature Range

CC

PWM

I

CHX

T

A

4.2 5.5 V

0.1 25 kHz

10 25

mA

-40 85

o

C

Electrical Characteristics

Limits in standard typeface are guaranteed for V

IN=VEN

=5V, R

=8kΩ,, TA=25

ISET

Parameter Symbol Conditions Min Typ Max Unit

o

C, unless otherwise specified.

Input Section

Input Voltage V

Quiescent Current I

Shutdown Quiescent Current I

Under Voltage Lockout Threshold V

Under Voltage Lockout Hysteresis V

IN

Q

SDB

UVLO

HUVLO

Current Sink Section

ISET Reference Voltage V

ISET

Current Multiplication Ratio K I

Maximum Output Current per Channel

Current Matching between Any Two Channels

Current Sink Saturation Voltage per Channel

I

CHX_MAX

I

CH-MATCH

V

CHX_SAT

Output Current Line Regulation V

Output Current Load Regulation V

4.2 5.5 V

No load 0.5 1 mA

VEN=0V 0.1 1 µA

Falling Edge 3.6 3.8 4.0 V

200 mV

1.170 1.194 1.218 V

CHX/ISET

V

V

V

I

CHX

V

I

CHX

I

CHX

I

CHX

370 400 430

=0.5V 23 45

CHX

=1V 65 70

CHX

=1.5V 110 120

CHX

CHX

=60mA

=1V

-1.5 1.5 %

=20mA 0.45

=60mA 0.8

=100mA 1.2

=4.2V to 5.5V 2 %/V

CC

=0.5V to 2.8V 4 %

CHX

mA

V

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Electrical Characteristics (Continued)

Limits in standard typeface are guaranteed for V

IN=VEN

=5V, R

=8kΩ,, TA=25

ISET

Parameter Symbol Conditions Min Typ Max Unit

Enable Section

o

C, unless otherwise specified.

EN Pin High Level Threshold Voltage V

EN Pin Low Level Threshold Voltage V

IH_EN

IL_EN

PWM Dimming Section

PWM High Level Threshold Voltage V

PWM Low Level Threshold Voltage V

IH_PWM

IL_PWM

Interface Section

SDB High Level Output Voltage V

SDB Low Level Output Voltage V

Feedback Output Current I

OH

OL

FB

Total De v i c e

Self-check Voltage @ Open LED V

Thermal Shutdown Temperature T

Thermal Shutdown Hysteresis T

CHECK

OTSD

HYS

Typical Performance Characteristics

VIN=VEN=5V, R

22.0

21.5

21.0

20.5

20.0

19.5

Current per Channel (mA)

19.0

18.5

18.0

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

=8kΩ,, TA=25

ISET

Temperature (oC)

o

C, unless otherwise specified.

R

=23K

ISET

1.8 V

0.8 V

1.8 V

0.8 V

2.4 V

0.4 V

515 µA

3.0 V

160

20

20

18

16

14

12

10

8

6

Current per Channel (mA)

4

2

0

0 20406080100

Duty Cycle (%)

o

C

o

C

Figure 4. Current per Channel vs. Temperature

Figure 5. Current per Channel vs. Duty Cycle

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Typical Performance Characteristics (Continued)

VIN=VEN=5V, R

=8kΩ,, TA=25

ISET

o

C, unless otherwise specified.

61.0

60.5

60.0

Current per Channel (mA)

59.5

59.0

4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6

Input Voltage (V)

Figure 6. Current per Channel vs. Input Voltage

140

120

100

80

60

40

Maximum Output Current (mA)

20

61.0

60.5

60.0

59.5

Current per Channel (mA)

59.0

0.51.01.52.02.53.03.5

Voltage per Channel (V)

Figure 7. Current per Channel vs. Voltage per Channel

0.5

0.4

0.3

0.2

Feedback Voltage (V)

0.1

0

0.4 0.6 0.8 1.0 1.2 1.4 1.6

Voltage per Channel (V)

Figure 8. Maximum Output Current vs. Voltage per Channel

0.0

0.000 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 0.018

Feedback Current (mA)

Figure 9. Feedback Voltage vs. Feedback Current

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Data Sheet

⋅

=

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Function Description

The AP3608E is designed for LED display application
which contains eight well-matched current sinks to
provide constant current through LED. The full scale
LED current can be adjusted from 10mA to 100mA
per channel with an external resistor. If there is some
channel unused, the channel pin should be connected
to ground. The LED bright dimming can be achieved
through PWM dimming.

The AP3608E can work with a DC/DC converter to
drive LED arrays for good performance. The device
can keep working when LED opens without damage,
and it features under voltage lockout protection and
over temperature protection. The detailed information
will be discussed in open LED self-check and
protection section.

1. LED Current Setting

The maximum LED current can be set up to 100mA
per channel by ISET pin. When the LED current is
greater than 100mA, two or more channels can be par­alleled to achieve larger drive current. To set the
reference current I

between this pin and ground. The value of R

, connect a resistor R

SET

ISET

ISET

can

be calculated by the following formula:

RV1941I /.=

ISETSET

This reference current is multiplied internally with a
gain (K) of 400, and then mirrored on all enabled
channels. This sets the maximum LED current,
referred to as 100% current (I

CHX_MAX

). The value

can be calculated by the following formula:

IKI

X_

SETMAXCH

The LED current can be reduced from 100% by PWM
dimming control.

2. PWM Dimming Mode

The LED current can be adjusted by applying the
PWM signal to PWM pin. On this mode, all enabled
channels are adjusted at the same time and the
brightness can be adjusted from 1%*I

100%*I

CHX_MAX

(@f

Dimming

=2kHz). During the

CHX_MAX

to

"high level" time of the PWM signal, the LED turns
on and the 100% current flows through LED. During
the "low level" time of the PWM signal, the LED
turns off and almost no current flows through LED. So
the average current through LED is changed and the
brightness is adjusted. The external PWM signal
frequency applied to PWM pin can be allowed to
100Hz or higher.

An example for PWM dimming is shown in Figure 10.
All 8 channels are set to the maximum current
I

CHX_MAX

at the beginning. When a 50% duty cycle

PWM signal is applied to PWM pin, average current
valued 50%* I

CHX_MAX

flows through the 8 channels.

When an 80% duty cycle PWM signal is applied to
PWM pin, average current valued 80%*I

CHX_MAX

flows through the 8 channels.

PWM

CH_MAX

I

CH1...CH8

Current

50% duty cycle

CH_MAX

I

0

Figure 10. PWM Dimming Example of AP3608E

80% duty cycle

CH_MAX

I

0

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Function Description (Continued)

3. Open LED Self-Check and Protection

The AP3608E can work with a DC/DC converter to
achieve good performance, such as self-check and
protection against open LED. The SDB pin and FB pin
are the interface terminals for working with the DC/
DC converter. FB pin samples voltage of each
channel, and outputs the lowest voltage of all strings to
DC/DC converter. When AP3608E gets shutdown
signal from EN pin or all channels are inactive, SDB
pin outputs low logic to DC/DC converter. When
AP3608E is on PWM dimming mode, the SDB pin
outputs the signal which is synchronous with PWM
signal to DC/DC converter. Figure 11 is the typical cir­cuit of AP3608E applied with a boost converter
AP3039.

If any enabled LED string opens, voltage on the
corresponding CHX pin goes to zero and the FB pin
outputs the zero voltage to boost converter. So the
boost converter operates in open loop and the voltage

on remaining CHX pin goes higher. Once the voltage
on remaining CHX pin reaches the self-check voltage
3V, the AP3608E begins looking up the open string.
After finding the open channel, AP3608E removes the
corresponding CHX pin from boost control loop, then
the boost circuit is controlled in the normal manner.
Once the circuit returns normal operation, the voltage
on the CHX pin is regulated to the normal level. It is
necessary to pay attention that the open strings are
removed from boost regulation, but not disabled. If the
open LED string is reconnected, it will sink current up
to the programmed current level.

4. Parallel Operation Mode

The AP3608E can be paralleled to drive more strings
of LED. Connecting an AP3608E SDB pin and FB pin
with another AP3608E SDBX pin and FBX pin can
achieve parallel application. More details please refer
to Figure 11.

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Typical Application

V

V

LED

C

LED

LED

C

LED

:6V to27V

V

IN

R1

R2

R

T

10

OFF ON

k

R

10k

C
nF

10

C

C

C

0.1µF

AP3608E Vcc

5.0V

External

C

IN1

10µF

UVLO

EN

RT

SS

C

SS

0.1µF

COMP

SDB

FB

VCC

IN2

Single Channel

VIN

OUT

CS

A
P

3

OV

0
3

SHDN

9

VCC

GND

ISET

AP

PWM

Dimming

C

10* 8

CH2CH1

3608E

GND

OFF ON

R

CS

30 m

V

AP3608E Vcc

5.0V

External

C

OUT

10µF

C

0.1µF

CH8

SDBX

FBX

EN

PWM

Single Chip Application

R3

R4

CH2CH1

SDB

1# AP3608E

FBFB

IN2

VCC

ISET

PWM

Dimming

GND

8K

OFF ON

AP3608E Vcc

5.0V

External

10* 8

C

0.1µF

CH2CH1

SDB

FB

IN2

VCC

ISET

PWM

Dimming

Paralleled Channels

CH8

SDBX

FBX

EN

PWM

V

CC

CH3

AP3608E

GND

OFF

ON

SDB

FB

VCC

ISET

10*4

CH4

SDBX

CH2CH 1

N# AP3608E

GND

8K

FBX

EN

PWM

10* 8

CH8

SDBX

FBX

EN

PWM

Multi Chips Application

Figure 11. Typical Applications of AP3608E

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Mechanical Dimensions

0.700(0.028)

0.800(0.031)

3.900(0.154)

4.100(0.161)

Pin 1 Dot

by Marking

0.000(0.000)

0.050(0.002)

QFN-4x4-24

0.200(0.008)

MIN

3.900(0.154)

4.100(0.161)

N13

0.153(0.006)

0.253(0.010)

0.500(0.020)

BSC

N19

2.600(0.102)

2.800(0.110)

0.180(0.007)

0.300(0.012)

Unit: mm(inch)

0.300(0.012)

0.500(0.020)

N24

N1

N7

2.600(0.102)

2.800(0.110)

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Mechanical Dimensions (Continued)

TSSOP-20(EDP) Unit: mm(inch)

6.400(0.252)

6.600(0.260)

4.100(0.161)

4.300(0.169)

2.900(0.114)

3.100(0.122)

PIN
#1

Note: Eject hole, oriented hole and mold mark is optional.

EXPOSED PAD

0.750(0.030)

INDEX

0.850(0.033)

0.650(0.026)TYP

0.200(0.008)

0.280(0.011)

0.000(0.000)

Dp

0.100(0.004)

0.900(0.035)

1.050(0.041)

0.340(0.013)

0.540(0.021)

6.200(0.244)

6.600(0.260)

1.200(0.047)
MAX

0.050(0.002)

0.150(0.006)

4.300(0.169)

4.500(0.177)

0.100(0.004)

0.190(0.007)

0.200(0.008)MIN

R0.090(0.004)MIN

R0.090(0.004)MIN

0.250(0.010)TYP

0°
8°

0.450(0.018)

0.750(0.030)

TOP & BOTTOM

1.000(0.039)
REF

4-

10°
14°

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Data Sheet

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E

Mechanical Dimensions (Continued)

SOIC-20 Unit: mm(inch)

Note: Eject hole, oriented hole and mold mark is optional.

Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

14

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

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

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30920 Huntwood Ave. Hayward,

Tel : [phone]

CA 94544, U.S.A

Fax: [phone]

Tel : [phone]
Fax: [phone]