AL5812EV3 - Diodes Incorporated

AL5812

Document number: DS35616 Rev. 4 - 2

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L5812

60V, 150mA ADJUSTABLE LINEAR LED DRIVER

Description

The AL5812 is an adjustable Linear LED driver offering excellent

temperature stability and output handling capability. The AL5812

simplifies the design of linear and isolated or non-isolated LED

drivers by setting the LED current with standard value resistors.

The AL5812 has an open drain output that can swing from 1V up to

60V enabling it drive long LED chains. Its low 0.5V RSET pin is outside

of the LED current path and so accuracy is maintained while

minimizing the required overheads to regulate the LED current. This

reduces its power dissipation when compared to traditional linear

LED drivers. This makes it ideal for driving LEDs up to 150mA

(commonly referred to as ½W LEDs).

Longer LED chains can be driven by tapping VCC from the chain,

where the chain voltage may exceed 60V.

The AL5812 is available in the exposed pad MSOP-8EP and

U-DFN3030-6 packages.

Features

 Low Reference Voltage (VRSET = 0.5V)

 -40°C to +125°C Temperature Range

 ±3% LED Current Tolerance

 Low Temperature Drift

 1V to 60V Open-Drain Output

 High Power Supply Rejection

 MSOP-8EP and U-DFN3030-6

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

Applications

 Isolated Offline LED Converters

 Linear LED Driver

 LED Signs

 Instrumentation Illumination

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

LED

NC

GNDR

SET

NC

V

CC

1

2

3

4

8

7

6

5

(Top View)

MSOP-8EP

U-DFN3030-6

(Top View)

LED

NC

GND

V

CC

NC

R

SET

3

2

1

4

5

6

Exposed

Pad

AL5812

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L5812

Pin Descriptions

Name

Number

(MSOP8-EP)

Number

(U-DFN3030-6)

Function

VCC 1 1

Power Supply Input.

Connect a 0.1μF ceramic capacitor between VCC and GND as close as possible to the

device.

RSET 4 3

LED Current Setting Pin.

Connect a resistor from this pin to GND:

I

LED = 750/RSET

May also be used to provide PWM dimming functionality.

GND 5 4 Ground Reference Point of Device.

LED 8 6 LED Current Sink Output.

NC 2, 3, 6, 7 2, 5 No Connection.

EP EP EP

Exposed Pad (bottom).

Used to improve thermal impedance of package.

It must be connected to GND directly underneath the package but not used as sole GND

potential terminal.

Functional Block Diagram

AL5812

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L5812

Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)

Symbol Parameters Ratings Unit

VCC Supply Voltage Relative to GND Pin (Note 4) -0.3 to +66 V

VLED LED Pin Voltage Relative to GND Pin (Note 4) -0.3 to +66 V

VRSET R

SET Pin Voltage Relative to GND Pin -0.3 to +6 V

ILED LED Pin Current Sink Current Range 165 mA

ESD HBM Human Body Model ESD Protection 1 kV

ESD CDM Charged Device Model ESD Protection 1.2 kV

TJ Operating Junction Temperature -40 to +150 °C

TST Storage Temperature -55 to +150 °C

Note: 4.VCC pin can be greater or smaller than VLED; neither should go below GND.

Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be

affected by exposure to absolute maximum rating conditions for extended periods of time.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting these devices.

Package Thermal Data

Package

θJC

Thermal Resistance

Junction-to-Case

(Note 7)

θJA

Thermal Resistance

Junction-to-Ambient

(Note 7)

PDIS

TA = +25°C, TJ = +125°C

(Note 7)

MSOP-8EP 39 90°C/W (Note 5) 1.1W

U-DFN3030-6 14 69°C/W (Note 6) 1.47W

Notes: 5. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and

thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.

6. Test condition for U-DFN3030-6: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and

thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed

7. Dominant conduction path via exposed pad.

Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)

Symbol Parameter Min Max Unit

VCC Supply Voltage Range Relative to GND Pin 3.5 60 V

VLED LED Pin Output Voltage Range Relative to GND Pin 1 60

ILED LED Pin Current (Notes 8 & 9) 10 150 mA

TA Operating Ambient Temperature Range -40 +125 °C

Notes: 8. For improved accuracy LED current should be greater than 60mA.

9. Maximum LED current is also limited by ambient temperature and power dissipation such that junction temperature should be kept less than or equal

to +125°C.

AL5812

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L5812

Electrical Characteristics (@TA = +25°C, VCC= 3.5V, VLED=1V (Note 10), RSET = 7.5kΩ unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

VRSET R

SET Voltage — T

A

= -40°C to +125°C — 0.5 — V

ILED I

LED Current Accuracy

RSET = 12.5kΩ

TA = +25°C

57 60 63

mA

RSET = 4.99kΩ 142.5 150 157.5

RSET = 7.5kΩ 97 100 103

T

A

= -40°C to +125°C 95 — 105

REGLINE LED Current Line Regulation VCC = 3.5V to 60V T

A

= +25°C — 0.25 — %

UVLO Under Voltage Lockout — T

A

= -40°C to +125°C — 2 — V

ICC Supply Current 3.5V ≤ VCC ≤ 60V T

A

= +25°C — 320 400 µA

T

A

= -40°C to +125°C — — 500

ILEAK LED Pin Leakage Current VCC = VLED = 60V

RSET = Open Circuit TA = +125°C — — 1 µA

TSHDN Thermal Shutdown — — — 155 — C

THYS Thermal Shutdown Hysteresis — — — 20 — C

Note: 10. All voltages unless otherwise stated are measured with respect to GND pin.

AL5812

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L5812

Typical Performance Characteristics

Notes: 11. These curves have been limited at larger input voltages due to power dissipation.

12. Lower input voltage range is limited by the LED chain voltage

13. The AL5812 has its VCC pin connected to its LED pin, which are connected to the positive input supply voltage. RSET is connected to AL5812 GND

pin, which is connected to the anode of the LED chain. This creates a high side driver of the LED chain. See Figure 15.

145

140

120

100

60

40

20

0

80

0 5 10 15 20 25 30 35 40 45 50 55 60

INPUT VOLTAGE (V)

Figure 1 LED Current vs. Input Voltage

LED

C

U

R

ENT (mA)

V = 1.2V

T = +25°C

LED

A

R = 4.99k

SET



R = 7.5k

SET



R = 12.4k

SET



-40 -25 -10 5

TEMPERATURE (°C)

Figure 2 LED Current vs. Ambient Temperature

20 35 50 65 80 95 110 125

L

E

D

C

U

R

E

N

T

(

m

A)

R = 4.99k

SET



R = 7.5k

SET



R = 12.4k

SET



V = 1.2V

V = 3.5V

LED

CC

160

140

120

100

80

60

40

20

0

0 5 10 15 20 25 30

LED VOLTAGE (V)

Figure 3 LED Current vs. LED Pin Voltage (Note 11)

LED CURRENT (mA)

V = 3.5V

T = +25°C

IN

A

R = 4.99k

SET



R = 7.5k

SET



R = 12.4k

SET



0 0.5 1.0 1.5 2.0 2.5 3.0

LED VOLTAGE (V)

Figure 4 LED Current vs. LED Pin Voltage Zoomed

L

E

D

C

U

R

E

N

T

(m

A

)

160

140

120

100

80

60

40

20

0

V = 3.5V

T = +25°C

IN

A

R = 12.4k

SET



R = 4.99k

SET



R = 7.5k

SET



0 5 10 15 20 25 30 35 40 45

INPUT VOLTAGE (V)

Figure 5 LED Current vs. Input Voltage - 2 LEDs

(Note 11 & 12)

160

140

120

100

80

60

40

20

0

LED CURRENT (mA)

T = +25°C

A

2 LEDs

R = 12.4k

SET



R = 4.99k

SET



R = 7.5k

SET



0246810121416182022

INPUT VOLTAGE (V)

Figure 6 LED Current vs. Input Voltage

2 LEDs - High Side Drive (Notes 11, 12 &13)

LED

C

U

R

ENT (m

A

)

160

140

120

100

80

60

40

20

0

T = +25°C

V pin tied to LED pin

2 LEDs

A

CC

R = 12.4k

SET



R = 4.99k

SET



R = 7.5k

SET



AL5812

Document number: DS35616 Rev. 4 - 2

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L5812

Typical Performance Characteristics (cont.)

T = +25°C

2 LEDs

R = 7.5k

f = 100Hz

A

SET

PWM



10 200901008040 5030 7060

DUTY CYCLE (%)

Figure 7 LED Current vs. PWM Duty Cycle

110

100

90

80

70

60

50

40

30

20

10

0

LED

C

U

R

E

N

T

(mA)

125 160130 155140 145 150135

TEMPERATURE (°C)

Figure 8 LED Current vs. T

SHDN

LED

C

U

R

EN

T

(mA)

14

12

10

6

2

-2

8

4

0

T

SHDN

T

HYS

V = 9V

R = 75K

IN

SET



0 5 10 15 20 25 30 35 40 45 50 55 60

INPUT VOLTAGE (V)

Figure 9 R Voltage vs. Input Voltage

SET

0.500

0.495

0.490

0.485

0.480

0.475

R

V

O

L

T

A

G

E (V)

SET

V = 1.2V

T = +25°C

LED

A

R = 7.5k

SET



R = 7.5k

SET



-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (C)

Figure 10 R Voltage vs. Ambient Temperature

SET

0.500

0.495

0.490

0.485

0.480

0.475

R

V

O

L

T

A

G

E (V)

SET

V = 1.2V

V = 3.5V

LED

IN

0 5 10 15 20 25 30 35 40 45 50 55 60

INPUT VOLTAGE (V)

Figure 11 Supply Current vs. Input Voltage

400

350

300

250

200

150

100

50

0

S

U

P

L

Y

C

U

R

EN

T

(µA)

V = 1.2V

T = +25°C

LED

A

R = 4.99k

SET



R = 7.5k

SET



R = 12.4k

SET



S

U

P

L

Y

C

U

R

EN

T

(µA)

350

300

250

200

150

100

50

0

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

Figure 12 Supply Current vs. Ambient Temperature

R = 4.99k

SET



R = 7.5k

SET



R = 12.4k

SET



V = 1.2V

V = 3.5V

LED

IN

AL5812

Document number: DS35616 Rev. 4 - 2

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L5812

Application Information

Description

The AL5812 is a Linear LED driver and in normal operation has the LEDs connected to the same potential as its VCC pin and regulates the LED

current by sinking current into to its LED pin see Figure 13.

The LED current is set by the use of an external resistor, RSET, connected from the RSET pin to GND. This resistor supplies the bias current of the

AL5812 together with current regulator to set the LED current.

The nominal LED current is determined by this equation:

SET

LED R

5.0

*1500I  where 1500 is the current ratio between the LED pin current and RSET pin current.

With RSET = 7.5k

mA100

k5.7

5.0

*1500ILED 

The AL5812 with its 60V capability on its supply pin, VCC, and its LED drive pin allows it to operate from supply rails up to 60V and/or directly

drive LED chains up to 60V as shown in Figures 13 and 14. The voltage applied to the VCC pin can be greater or lower than the voltage applied

to the LED string. Figure 14 shows where you might control it from a 5-V rail but power the rails from a 12V rail.

Figure 13 Low Side Current LED Setting

Figure 14 Low Side Drive – Separate Supplies

AL5812

V

CC

LED

GND

R

SET

R

SET

= 4.99kΩ

V

IN

C

IN

0.1µF

V

LED

AL5812

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L5812

Application Information (cont.)

High Voltage Operation

An extension of Figure 14 is to derive the power for the AL5812 from the LED chain itself see Figure 15. LED chains greater than 60V can be

driven in this manner as long PWM dimming is not utilized.

Figure 15 Low Side LED String Tapping

Figure 16 High Side Current LED String

Figure 15 shows the use of RC delay to match the power time delay between Vcc and LED pin. The AL5812 can also be used on the high side of

the LEDs, see Figure 16. This is a simple way of extending the maximum LED chain voltage, however, it does increase the minimum system input

voltage to:

V

IN(min) = VLED_CHAIN + 3.5V.

Where

V

LED_CHAIN is the LED chain voltage.

AL5812

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L5812

Application Information (cont.)

PWM Dimming

The AL5812 can be used to provide LED current dimming driving the RSET pin via the current setting resistor (RSET) and a series MOSFET switch

to ground (Figure 17). The RSET pin current is then effectively switched on and off causing the LED current to turn on and off. The linearity is

shown in Figure 18.

Figure 17 PWM Dimming

Thermal Considerations

When designing linear LED drivers careful consideration must be given to:

1. the power dissipation within the LED driver

and

2. PCB layout/heat sinking.

A Linear LED driver has to be able to handle the large potential input voltage variations due to the supply voltage tolerance and also the variation

in LED forward voltage due to binning and temperature.

This can result in a large potential difference across the LED driver resulting in a larger than anticipated power dissipation.

For example in an 12V powered system with a 5% output voltage tolerance; the input voltage could typically vary from 12.6V down to 11.4V

driving 3 LEDs with a voltage varying from 3V to 3.5V at 100mA. This means that the LED driver has to cope with a voltage drop across varying

from approximately 3.6V to 0.9V. This means that the power dissipation of the AL5812 could be as much as 366mW.

Figure 19 below shows how the AL5812’s power dissipation capability varies with package; these values will vary with PCB size and area of

metal associated with the ground plane used for heat sinking. By increasing the area on the top layer the thermal impedance of both packages

could be improved.

T = +25°C

2 LEDs

R = 7.5k

f = 500Hz

A

SET

PWM



10 200901008040 5030 7060

DUTY CYCLE (%)

Figure 18 PWM Dimming Linearity

110

100

90

80

70

60

50

40

30

20

10

0

LED

C

U

R

EN

T

(m

A

)

-40 -25 -10 5 20 35 50 65 80 95 110 125

AMBIENT TEMPERATURE (C)

Figure 19 Power Dissipation Derating

1.6

1.4

0.2

0.0

0.6

0.4

1.0

0.8

1.2

P

O

W

E

R

DI

S

I

P

A

T

I

O

N

(W)

U-DFN3030-6

MSOP-8EP

AL5812

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Ordering Information

Device Package Code Packaging 7”/13” Tape and Reel

Quantity Part Number Suffix

AL5812MP-13 MP MSOP-8EP 2500/Tape & Reel -13

AL5812FF-7 FF U-DFN3030-6 3000/Tape & Reel -7

Marking Information

(1) MSOP-8EP

(2) U-DFN3030-6

XX : Identification Code

( Top View )

X : A~Z : Green

XY

X X

W

Y : Year : 0~9

W : Week : A~Z : 1~26 week;

a~z : 27~52 week; z represents

52 and 53 week

Part Number Package Identification Code

AL5812FF-7 U-DFN3030-6 B9

AL5812 XX - XX

Package

FF : U-DFN3030-6

MP : MSOP-8EP

Packing

7 : 7” Tape & Reel

13 : 13” Tape & Reel

A~Z : Green

MSOP-8EP

Y : Year : 0~9

W : Week: A~Z : 1~26 week;

a~z : 27~52 week;

z represents 52 and 53 week

(Top View)

Logo

Part Number

8 7 6 5

Y W X E

AL5812

1 2 3 4

AL5812

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Package Outline Dimensions (All dimensions in mm.)

Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.

(1) MSOP-8EP

(2) U-DFN3030-6

MSOP-8EP

Dim Min Max Typ

A - 1.10 -

A1 0.05 0.15 0.10

A2 0.75 0.95 0.86

A3 0.29 0.49 0.39

b 0.22 0.38 0.30

c 0.08 0.23 0.15

D 2.90 3.10 3.00

D1 1.60 2.00 1.80

E 4.70 5.10 4.90

E1 2.90 3.10 3.00

E2 1.30 1.70 1.50

E3 2.85 3.05 2.95

e - - 0.65

L 0.40 0.80 0.60

a 0° 8° 4°

x - - 0.750

y - - 0.750

All Dimensions in mm

U-DFN3030-6

Dim Min Max Typ

A 0.57 0.63 0.60

A1 0 0.05 0.02

A3 - - 0.15

b 0.35 0.45 0.40

D 2.95 3.05 3.00

D2 2.25 2.45 2.35

E 2.95 3.05 3.00

E2 1.48 1.68 1.58

e - - 0.95

L 0.35 0.45 0.40

Z - - 0.35

All Dimensions in mm

1

D

A

A1

A2

E

e

y

x

Seating Plane

Gauge Plane

L

D

8Xb

See Detail C

Detail C

c

a

E1

E3

A3

E2

4X10°

0.25

D1

D

D2

E

eb

L

E2

A

A3

︵

Pin #1 ID

︶

Seating Plane

Z

︵

4x

︶

A1

45°

︵

0.35*0.35

︶

AL5812

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Suggested Pad Layout

Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for latest version.

(1) MSOP-8EP

(2) U-DFN3030-6

Dimensions Value

(in mm)

C 0.650

G 0.450

X 0.450

X1 2.000

Y 1.350

Y1 1.700

Y2 5.300

Dimensions Value

(in mm)

C 0.950

X 0.500

X1 2.400

X2 2.550

Y 0.600

Y1 1.780

Y2 3.300

G

X C

Y

Y2 Y1

X1

X2

Y1

Y

C

Y2

X1

X

C-0.409

AL5812

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