Diodes AP3612 User Manual

Boost Type LED Driver with 12-Channel Current Source AP3612

Preliminary Datasheet

General Description

The AP3612 is a high efficiency boost controller with
12-string current sources for driving WLED backlight.
It operates over a wide input voltage range from 4.5V
to 33V.

The current of 12 strings are simply programmed
from 20mA to 75mA with an external resistor. The
current matching between each string is 1.5% (Typ).
Its operating frequency can be adjusted from 0.1MHz
to 1MHz.

The AP3612 features Cycle-by-cycle Current Limit,
Soft Start, Under Voltage Lock Out (UVLO)
protection, programmable OVP, Over Temperature
Protection (OTP), open/short LED protection, V
short protection and Schottky diode short-circuit
protection.

The AP3612 is available in HSOP-28 and SOIC-24
packages.

OUT

Features

• Input Voltage Range: 4.5V to 33V

• Drives up to 12 Strings in Parallel, 75mA per
String

• Programmable WLED Current from 20mA to

75mA

• Adjustable Operating Frequency: 100kHz to
1MHz

• String-to-string Current Matching Accuracy:

1.5%

• Built-in OCP, OTP, UVLO

• External PWM Dimming

• Open/Short LED Protection

• Programmable Soft Start

• Programmable OVP

• Schottky Diode/Inductor Short-circuit Protection

• V

Short/Schottky Diode Open Protection

OUT

Applications

• LCD Monitor

• LCD Display Module

• LCD TV

HSOP-28 SOIC-24

Figure 1. Package Types of AP3612

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

1

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Pin Configuration

M28 Package M Package

(HSOP-28) (SOIC-24)

CH2
CH3
CH4
CH5
CH6

NC

GND

CH7
CH8

CH9
CH10
CH11

ISET

CH12

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

CH1
DIM
COMP

NC
STATUS

VIN
VCC

NC

GND

OUT
CS
EN
RT
OVP

CH7
CH8

CH9
CH10
CH11

ISET

CH12

OVP

RT

EN
CS

OUT

10
11
12

1

2

3

4

5

6

7

8

9

24
23
22
21
20

19
18

17
16
15
14
13

GND
CH6

CH5
CH4

CH3
CH2
CH1
DIM
COMP
STATUS

VIN
VCC

Figure 2. Pin Configuration of AP3612 (Top View)

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

2

µ

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Pin Description

Pin Number

HSOP-28 SOIC-24

28,1,2,3,4,5,

8,9,10,11,12 ,14

6, 21,25

7, 20 24 GND

13

15

16

17 10 EN

18 11 CS

19 12 OUT

22 13 VCC

23 14 VIN

24 15 STATUS
26 16 COMP

27 17 DIM

18,19,20,21, 22,23,

1, 2, 3, 4, 5, 7

6

8 OVP

9

Pin Name Function

CH1 to CH12

NC

ISET

RT

LED current sink. Leave the pin open directly
if not used

No connection

Ground pin

LED current setting pin. The corresponding
maximum current of all strings is set through
connecting a resistor from this pin to GND
Over voltage protection pin. When the OVP
pin voltage exceeds 2.0V, the OVP is triggered
and the power switch is turned off. When the
OVP pin voltage drops below hysteresis
voltage, the OVP is released and the power
switch will resume normal operation

Frequency control pin

ON/OFF control pin. Forcing this pin above

2.4V enables the IC while below 0.5V shuts
down the IC. When the IC is in shutdown
mode, all functions are disabled to decrease
the supply current below 3µA

Power switch current sense input
Boost converter power switch gate output.

This pin output high voltage (5V/V
drive the external N-MOSFET
5V linear regulator output pin. This pin should
be bypassed to GND (recommend to connect
with GND pin) with a ceramic capacitor
Supply input pin. A capacitor (typical 10
should be connected between the VIN and
GND to keep the DC input voltage constant

LED operation status output
Soft-start and control loop compensation
PWM dimming control pin. Adding a PWM

signal to this pin to control LED dimming. If
not used, connect it to the high level

-0.5V) to

IN

F)

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Functional Block Diagram

Figure 3. Functional Block Diagram of AP3612

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

4

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Ordering Information

AP3612 -

Circuit Type

Package
M28: HSOP-28
M: SOIC-24

G1: Green

Blank: Tube

Package

HSOP-28

SOIC-24 AP3612M-G1 AP3612M-G1 Tube

Temperature

Range

-40 to 85°C

Part Number Marking ID Packing Type

AP3612M28-G1 AP3612M28-G1 Tube

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

CH1 to CH12 Voltage

EN Pin Voltage

VCC Pin Voltage

CS Pin Voltage

COMP Pin Voltage

ISET Pin Voltage

OUT Pin Voltage

OVP Pin Voltage

RT Pin Voltage

STATUS Pin Voltage

DIM Pin Voltage

GND Pin Voltage

Thermal Resistance
(Junction to Ambient,
Free Air, No Heatsink)

HSOP-28

SOIC-24 100

V

V

V

V

V

V

COMP

V

V

V

V

V

STATUS

V

V

θ

IN

CH

EN

CC

CS

ISET

OUT

OVP

RT

DIM

GND

JA

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

5

-0.3 to 42 V

-0.3 to 65 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 7 V

-0.3 to 0.3 V

59

ºC/W

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Absolute Maximum Ratings (Note 1) (Continued)

Parameter Symbol Value Unit

Operating Junction Temperature

Storage Temperature

Lead Temperature
(Soldering, 10sec)

ESD (Machine Model) 200 V

ESD (Human Body Model) 2000 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: Negative CS 100ns Transient maximum rating voltage reach to -0.4V.

T

T

T

J

STG

LEAD

150 ºC

-65 to 150 ºC

260 ºC

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Input Voltage V

Operating Frequency fO 0.1 1 MHz

LED Channel Voltage V

LED Channel Current I

PWM Dimming Frequency f

Operating Ambient Temperature
Range

IN

60 V

CHX

20 75 mA

CHX

0.1 20 kHz

PWM

-40 85 ºC

T

A

4.5 33 V

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Electrical Characteristics

V

=24V, VEN=5V, Typical TA=25°C, unless otherwise specified.

IN

Parameter Symbol Conditions Min Typ Max Unit
INPUT SUPPLY

Input Voltage VIN 4.5 33 V

Quiescent Current IQ No Switching 3 5 mA

Shutdown Supply Current I

UVLO V

UVLO Hysteresis V

SHTD

UVLO

HYS

VCC SECTION

VCC Voltage VCC

OUT Pin Rising Time (Note 3) t

OUT Pin Falling Time (Note 3) t

RISING

FALLING

Load Regulation (Note 3)

Line Regulation (Note 3)

HIGH FREQUENCY OSCILLATOR

Switch Frequency
(Target: 10% Variation)

Switch Frequency Range

Maximum Duty Cycle D

f

OSC

0.1 1 MHz

MAX

VEN=VDD=0V 0.1 3

V

Rising 3.6 3.8 4.0 V

IN

µA

200 mV

≥5.5V

V

IN

VIN＜5.5V,

Load=10mA

5 V

V

-0.1 V

IN

1nF Load 30 50 ns

1nF Load 30 50 ns

Load=0 to
30mA

=5.5 to

V

IN

24V

=100kΩ

R

T

5

0.3

440 520 600 kHz

mV/mA

mV/V

f=500kHz 88 90 %

Minimum On-time (Note 3) t

f=500kHz 200 ns

ON-TIME

ENABLE LOGIC AND DIMMING LOGIC

EN High Voltage V

EN Low Voltage V

PWM Logic for External Dimming

PWM Dimming Minimum Pulse
Width (Note 3)

t

2.4 V

EN_H

0.5 V

EN_L

V

V

PWM_MIN

2.5 V

DIM_H

0.3 V

DIM_L

3/f

OSC

µs

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Electrical Characteristics (Continued)

V

=24V, VEN=5V, Typical TA=25°C, unless otherwise specified.

IN

Parameter Symbol Conditions Min Typ Max Unit
POWER SWITCH DRIVE

Current Limit Threshold Voltage V

D/L Short Threshold Voltage
(Note 3)

Current Sense LEB Time
(Note 3)

480 540 600 mV

LIMIT

V

720 800 880 mV

LIMIT2

80 100 150 ns

t

LEB

COMPENSATION AND SOFT START (COMP PIN)

Error Amplifier
Trans-conductance

Sourcing Current I

Sinking Current I

2300

G

EA

V

O_H

V

O_L

COMP

COMP

OVER VOLTAGE PROTECTION

OVP Threshold Voltage V

OVP Hysteresis V

Shutdown Under Abnormal
Condition

OVP

OVP_HYS

V

OVP-SH

V

OUT

250 mV

3.0 3.2 3.4 V

CURRENT SOURCE

LED Current Matching between
Each String (Note 4)

I

CH_MATCHICH

Regulation Current per Channel ICH

Minimum LED Regulation
Voltage

CH1 to CH12 Leakage Current I

LED Short Protection Threshold V

V

LED_REGICHX

LED_LEAK

LED-S

6.6 7.3 8.0 V

=60mA

R

ISET

VEN=0V,
V

LED

OVER TEMPERATURE PROTECTION

Thermal Shutdown Temperature
(Note 3)
Thermal Shutdown Recovery
(Note 3)

160 ºC

T

OTSD

140 ºC

T

HYS

Note 3: Guaranteed by design.

Note 4:

I

_

=

MATCHST

2

MINMAX

I

×

×

AVG

%100

II

−

µA/V

=0.5V 80 120 160

=2V 80 120 160

µA

µA

Rising 1.9 2.0 2.1 V

=6.667kΩ

55 60 65 mA

1.5 4 %

=60mA 400 mV

=37V

0.1 1

µA

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Typical Performance Characteristics

=24V, VEN=VDD=5V, 13 LEDs in series, 12 strings in parallel, 60mA/string, TA=25°C, unless otherwise

V

IN

specified.

1200
1100
1000

900
800
700
600
500

Frequency (kHz)

400
300
200
100

0

0 100 200 300 400 500 600 700

Figure 4. Frequency vs. R

RT (kΩ)

5.4

T

5.2

5.0

4.8

4.6

4.4

4.2

VCC Voltage(V)

4.0

3.8

3.6
4 6 810121416182022242628303234

C

=2.2µF

VCC

Input Voltage(V)

Figure 5. VCC Voltage vs. Input Voltage

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

Regulation Voltage (V)

CH

V

0.20

0.15

0.10
20 25 30 35 40 45 50 55 60 65 70

Output Current /CH (mA)

RT=100k

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

Regulation Voltage (V)

CH

V

0.10

0.05

0.00

-50 -25 0 25 50 75 100 125 150

Temperature (oC)

VIN=24V, R

ISET

=10k

Figure 6. VCH Regulation Voltage vs. Output Current Figure 7. V

Regulation Voltage vs. Temperature

LED

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

9

m

m

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Typical Performance Characteristics (Continued)

VIN=24V, VEN=VDD=5V, 13 LEDs in series, 12 strings in parallel, 60mA/string, TA=25°C, unless otherwise
specified.

80

70

60

50

40

30

20

Channel Current (mA)

10

0

012345

Figure 8. Channel Current vs. Channel Figure 9. Efficiency vs. Output Current

Channel

I

SET

I

SET

I

SET

I

=73mA

=60mA

=40mA

=20mA

SET

98

96

94

92

90

88

Efficiency (%)

86

84

82

80

0 100 200 300 400 500 600 700 800

VIN=24V
LED: 12P13S

Output Current (mA)

V

SW

50V/div

ICH

10mA/div

V

OUT_AC

500

V/div

V

CH

200

V/div

V

20V/div

V

20V/div

V

OUT

20V/div

I

100mA/div

IN

SW

CH

Time 1µs/div

Time 20ms/div

Figure 10. Steady State Figure 11. System Startup

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Typical Performance Characteristics (Continued)

VIN=24V, VEN=VDD=5V, 13 LEDs in series, 12 strings in parallel, 60mA/string, TA=25°C, unless otherwise
specified.

V

PWM

5V/div

VSW

20V/div

V

STATUS

5V/div

V

50V/div

I

100mA/div

CH

SW

ICH

50mA/div

V

CH

5V/div

Time 2ms/div

Time 10µs/div

Figure 12. PWM Dimming Figure 13. LED Short Protection

V

STATUS

5V/div

50V/div

50mA/div

V

ICH

SW

V

SW

50V/div

V

STATUS

5V/div

V

1V/div

CS

V

OVP

1V/div

I

50mA/div

CH

Time 50ms/div

Time 50µs/div

Figure 14. LED Open Protection Figure 15. Schottky/Inductor Short Protection

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Typical Performance Characteristics (Continued)

VIN=24V, VEN=VDD=5V, 13 LEDs in series, 12 strings in parallel, 60mA/string, TA=25°C, unless otherwise
specified.

V

V

IN

10V/div

V

OVP

5V/div

V

GATE

5V/div

I

CH

50mA/div

Figure 16. V

Time 5ms/div

Short/Diode Open Protection Figure 17. Over Temperature Protection

OUT

SW

50V/div

V

STATUS

5V/div

V

OUT

50V/div

I

CH

50mA/div

Time 1s/div

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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+

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Application Information

1. Enable

The AP3612 is enabled when the voltage to EN is
greater than approximately 2.4V, disabled when lower
than 0.5V.

2. Frequency Selection

An external resistor RT, placed between RT pin and
GND, can be used to set the operating frequency. The
operating frequency ranges from 100kHz to 1MHz.
The high frequency operation optimizes the regulator
for the smallest-sized component application, while
low frequency operation can help to reduce switch
loss. The approximate operating frequency can be
expressed as below:

OSC

][

MHzf

52

=

RT

][

Ω

KR

3. LED Current Setting

The maximum LED current per channel can be
adjusted up to 75mA via ISET pin. When ≥75mA
current is needed in application, two or more
channels can be paralleled to provide larger drive
current. Connect a resistor R
and GND to set the reference current I
current can be expressed as below:

400

=

ISET

][

Ω

KR

LED

][

mAI

between ISET pin

ISET

SET

. The LED

4. Dimming Control

Applying a PWM signal to DIM pin to adjust the
LED current, that means, the LED current of all
enabled channels can be adjusted at the same time
and the LED brightness can be adjusted from 1%×
I

CHX_MAX

level” period of PWM signal, the LED is turned on
and 100% of the current flows through LED, while
during the “low level” period of the PWM signal, the
LED is turned off and almost no current flows
through the LED, thus changing the average current
through LED and finally adjusting LED brightness.
The external PWM signal frequency applied to PWM
pin is allowed to be 100Hz or higher.

to 100% × I

CHX_MAX

. During the “high

5. Status Output

After IC is enabled, STATUS will output logic low if
any of the following conditions exists:

1) Any String is Open

2) LED Short Circuit Protection

3) Shut Down Under Abnormal Condition

4) Over Temperature Protection

5) Schottky Diode Short Protection

6) Over Voltage Protection

7) V

Short/Open Schottky Diode Protection

OUT

6. Over Voltage Protection

The AP3612 integrates an OVP circuit. The OVP pin
is connected to the center tap of voltage-divider (R
and R
and GND. If the voltage on OVP pin exceeds 2.0V,
which may results from open loop or excessive
output voltage, all the functions of AP3612 will be
disabled with output voltage falling. The OVP
hysteresis is 250mV. The formula of OVP can be
expressed as below:

V

) that placed between high voltage output

OV2

2.0V)R(R

×

=

OVP

OV2OV1

R

OV2

OV1

7. Over Current Protection

The AP3612 integrates an OCP circuit. The CS pin is
connected to the voltage-sensor (R
between the Drain of MOS and GND. If the voltage
on CS pin exceeds 0.54V, it is turned off immediately
and will not turn on until the next cycle begins.

) that placed

CS

8. LED Short-circuit Protection

The AP3612 integrates an LED Short-circuit
protection circuit. If the voltage at any of the
CH1-CH12 pins exceeds a threshold of
approximately 7.3V during normal operation, the
corresponding string is turned off and is latched off.
Toggle V
detecting logic priority is lower than open LED and
OVP logic. The LED short detecting is triggered
when 0.1V<V
disabled when LED open occurs until output voltage
resumes to the regulated voltage.

and/or EN to reset the latch. LED short

IN

under dimming on mode,

LED_MIN

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Application Information (Continued)

9. LED Open-circuit Protection

The AP3612 integrates an LED Open-circuit
Protection circuit. When any LED string is open,
V

will boost up until the voltage at OVP pin

OUT

reaches an approximate 2.0V threshold. The IC will
automatically ignore the open string whose
corresponding pin voltage is less than 100mV and the
remaining string will continue operation. If all the
strings are open and the voltage at OVP reaches a
threshold of 2.0V, the MOSFET drive GATE will turn
off and IC will shut down and latch.

10. V

Short/Open Schottky Diode

OUT

Protection

The AP3612 monitors the OVP pin, if the OVP pin
voltage is less than 0.1V, MOSFET drive output will
turn off. This protects the converter if the output
Schottky diode is open or V

is shorted to ground.

OUT

11. Under Voltage Lockout

The AP3612 provides an under voltage lockout
circuit to prevent it from undefined status when
startup. The UVLO circuit shuts down the device
when V
200mV hysteresis, which means the device starts up
again when V

drops below 3.6V. The UVLO circuit has

CC

rise to 3.8V.

CC

12. Over Temperature Protection

The AP3612 features Over Temperature Protection, if
the junction temperature exceeds approximately
160ºC, the IC will shut down until the junction
temperature is less than approximately 140ºC. When
the IC is released from over temperature shutdown, it
will start a soft-start process.

13. Schottky Diode/Inductor Short Cir­cuit Protection

The AP3612 features Schottky diode/inductor
short-circuit protection circuit. When CS pin voltage
exceeds 0.8V for greater than 16 switching clocks,
the IC will be latched. The voltage of CS is
monitored after a short delay of LEB.

14. Shut Down under Abnormal Cond­ition

The AP3612 features shutdown under abnormal
condition protection circuit. When OVP pin voltage
exceeds 3.2V, the IC will latch. Toggle EN to restart
the IC. This feature can be used for any other
protection to shut down the IC.

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Typical Application

---

Figure 18. Typical Application Circuit of AP3612

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

15

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Mechanical Dimensions

HSOP-28 Unit: mm(inch)

10.000(0.394)

10.650(0.419)

17.890(0.704)

18.190(0.716)

0.400(0.016)

1.270(0.050)

0.204(0.008)

0.360(0.014)

7.400(0.291)

7.600(0.300)

5.050(0.199)

5.250(0.207)

0.230(0.009)

0.470(0.019)

2.180(0.086)

2.330(0.092)

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

0.800(0.031)

0.100(0.004)

0.300(0.012)

o

0

～

TYP

2.280(0.090)

2.630(0.104)

o

8

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

16

Preliminary Datasheet

Boost Type LED Driver with 12-Channel Current Source AP3612

Mechanical Dimensions (Continued)

SOIC-24 Unit: mm(inch)

2.350(0.093)

2.800(0.110)

0.330(0.013)

0.510(0.020)

2.100(0.083)

2.650(0.104)

9.800(0.386)

10.610(0.418)

0.204(0.008)

0.330(0.013)

0.400(0.016)

1.270(0.050)

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

7.400(0.291)

7.600(0.299)

BSC

1.270(0.050)

0°

8°

15.200(0.598)

15.600(0.614)

0.050(0.002)

0.300(0.012)

Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

17

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

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- Wafer Fab

BCD Semiconductor Manufacturing Limited

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.

- IC Design Group

800 Yi Shan Road, Shanghai 200233, China

Advanced Analog Circuits (Shanghai) Corporation

Tel: [phone], Fax: [phone]

8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China
Tel: [phone], Fax: [phone]

Taiwan Office
BCD Semiconductor (Taiwan) Company Limited

Taiwan Office

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

BCD Semiconductor (Taiwan) Company Limited

Tai wan

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

Tel: [phone]

Taiwan

Fax: [phone]

Tel: [phone]
Fax: [phone]

USA Office
BCD Semiconductor Corp.

USA Office

30920 Huntwood Ave. Hayward,

BCD Semiconductor Corporation

CA 94544, USA

30920 Huntwood Ave. Hayward,

Tel : [phone]

CA 94544, U.S.A

Fax: [phone]

Tel : [phone]
Fax: [phone]