Diodes AL5812 User Manual

A

V

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 R

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 V

where the chain voltage may exceed 60V.

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

NEW PRODUCT

U-DFN3030-6 packages.

pin is outside

SET

from the chain,

CC

Features

• Low Reference Voltage (V

• -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)

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/quality/lead_free.html 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.

RSET

= 0.5V)

Pin Assignments

V

1

CC

2

NC

3

NC

4

SET

V

CC

1

NC

2

R

SET

3

Applications

• Isolated Offline LED Converters

• Linear LED Driver

• LED Signs

• Instrumentation Illumination

(Top View)

MSOP-8EP

(Top View)

Exposed

Pad

U-DFN3030-6

LED

8

NC

7

6

NC

5

GNDR

LED

6

NC

5

GND

4

L5812

Typical Applications Circuit

AL5812

Document number: DS35616 Rev. 2 - 2

C0.1µF

1 of 11

www.diodes.com

IN

V

CC

LED

AL5812

R

SET

GND

R 7k5

SET

November 2013

A

Pin Descriptions

L5812

Name

VCC

R

SET

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

Functional Block Diagram

NEW PRODUCT

(MSOP8-EP) (U-DFN3030-6)

Pin Number Function

1 1

4 3

Power Supply Input. Connect a 0.1μF ceramic capacitor between V

device.

LED Current Setting Pin. Connect a resistor from this pin to GND: I May also be used to provide PWM dimming functionality.

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.

and GND as close as possible to the

CC

= 750/R

LED

SET

Absolute Maximum Ratings (@T

Symbol Parameters Ratings Unit

VCC

V

LED

V

R

RSET

I

LED

ESD HBM Human Body Model ESD Protection 1 kV

ESD CDM Charged Device Model ESD Protection 1.2 kV

TJ

TST

Note: 4.V

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.

CC

AL5812

Document number: DS35616 Rev. 2 - 2

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

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

Pin Voltage Relative to GND Pin

SET

LED Pin Current Sink Current Range 165 mA

Operating Junction Temperature -40 to +150 °C

Storage Temperature -55 to +150 °C

pin can be greater or smaller than V

= +25°C, unless otherwise specified.)

A

-0.3 to +6 V

; neither should go below GND.

LED

2 of 11

www.diodes.com

November 2013

A

Package Thermal Data

θ

Package

Thermal Resistance

JC

Junction-to-Case

Thermal Resistance

Junction-to-Ambient

(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 (@T

Symbol Parameter Min Max Unit

VCC

V

NEW PRODUCT

I

LED

TA

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.

Electrical Characteristics (@T

Supply Voltage Range Relative to GND Pin

LED Pin Output Voltage Range Relative to GND Pin

LED Pin Current (Notes 8 & 9)

Operating Ambient Temperature Range

= +25°C, VCC= 3.5V, V

A

θ

JA

= +25°C, TJ = +125°C

T

A

(Note 7)

= +25°C, unless otherwise specified.)

A

P

DIS

(Note 7)

3.5 60

1 60

10 150 mA

-40 +125 °C

=1V (Note 10), R

LED

= 7.5kΩ unless otherwise specified.)

SET

V

L5812

Symbol Parameter Conditions Min Typ Max Unit

V

R

RSET

I

REG

LED

LINE

LED

LED Current Line Regulation

Voltage

SET

Current Accuracy

V

UVLO Under Voltage Lockout

ICC

I

LEAK

T

SHDN

T

HYS

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

Supply Current

LED Pin Leakage Current

3.5V ≤ VCC ≤ 60V

V

R

SET

Thermal Shutdown 155

Thermal Shutdown Hysteresis 20

R

= 12.5kΩ

SET

R

= 4.99kΩ

SET

R

= 7.5kΩ

SET

= 3.5V to 60V TA = +25°C

CC

TA = -40°C to +125°C

T

A

TA = -40°C to +125°C

= V

LED

= 60V

CC

= Open Circuit

= +25°C

T

A

= -40°C to +125°C

T

= +25°C

A

= +125°C

T

A

0.5 V

57 60 63

142.5 150 157.5

97 100 103

mA

95 105

0.25 %

2 V

320 400

500

µA

1 µA

°C

AL5812

Document number: DS35616 Rev. 2 - 2

3 of 11

www.diodes.com

November 2013

A

ED CUR

REN

m

ED CURRENT (m

CUR

RENT

A

E

CURRENT

A

Typical Performance Characteristics

145

140

R = 4.99k

SET

Ω

160

140

R = 4.99k

SET

Ω

L5812

NEW PRODUCT

120

A)

100

T (

R = 7.5k

SET

Ω

80

60

L

40

V = 1.2V

LED

20

T = +25°C

A

0

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

R = 12.4k

SET

Ω

INPUT VOLTAGE (V)

Figure 1 LED Current vs. Input Voltage

R = 4.99k

LED CURRENT (mA)

SET

Ω

R = 7.5k

SET

R = 12.4k

SET

V = 3.5V

IN

T = +25°C

A

Ω

120

A)

100

R = 7.5k

Ω

SET

80

60

L

R = 12.4k

SET

Ω

40

V = 1.2V

LED

20

V = 3.5V

CC

0

-40 -25 -10 5

20 35 50 65 80 95 110 125

TEMPERATURE (°C)

Figure 2 LED Current vs. Ambie nt Temperature

160

)

(m

140

120

100

R = 4.99k

SET

Ω

R = 7.5k

SET

V = 3.5V

IN

T = +25°C

A

Ω

80

60

LED

R = 12.4k

SET

Ω

40

20

0 5 10 15 20 25 30

LED VOLTAGE (V)

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

160

R = 4.99k

SET

Ω

140

120

R = 7.5k

100

SET

80

60

LED CURRENT (mA)

40

20

0

0 5 10 15 20 25 30 35 40 45

T = +25°C

A

2 LEDs

R = 12.4k

SET

INPUT VOLTAGE (V)

Figure 5 LED Current vs. Input Voltage - 2 LEDs

(Note 11 & 12)

Ω

0

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

160

R = 4.99k

SET

R = 7.5k

SET

)

(m

140

120

100

80

60

D L

R = 12.4k

SET

40

T = +25°C

20

0

0 2 4 6 8 10121416182022

A

V pin tied to LED pin

CC

2 LEDs

INPUT VOLTAGE (V)

Figure 6 LED Cur rent vs. Input Voltage

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

Ω

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

pin connected to its LED pin, which are connected to the positive input supply voltage. R

CC

is connected to AL5812 GND

SET

AL5812

Document number: DS35616 Rev. 2 - 2

4 of 11

www.diodes.com

November 2013