AL1781/1782

Document number: DS41312 Rev. 1 - 2

4 of 18

www.diodes.com

August 2018

© Diodes Incorporated

AL1781/1782

Functional Block Diagram

Pre_regulator

Bandgap

Bias current

UVLO

Dimming Signal

Process

Protection Function

&Fault Reporting

REF1

PWM1

PWM2

VIN

LED1

LED2

FAULTB

GND

VDD

Current Reference

Current Ratio

Circuit

PWM Control

Current Ratio

Circuit

PWM Control

Adaptive Thermal

Management

LEDPG

REF2

Current Reference

Functional Block Diagram of AL1782 (Note 4)

Note: 4. REF2, PWM2 and LED2 are not applicable to AL1781.

Symbol

Parameter

Rating

Unit

ESD

HBM

Human Body Model ESD Protection

4000

V

CDM

Charged Device Model ESD Protection

1000

V

Input Voltage for VIN

33

V

LEDx Voltage

33

V

PWMx, FaultB and LEDPG Voltage

7

V

REFx Voltage

5

V

Maximum Junction Temperature

+160

°C

Storage Temperature Range

-65 to +150

°C

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.

Symbol

Parameter

Min

Max

Unit

Input Voltage at VIN

6.5

30

V

Operating Ambient Temperature

-40

+125

C

High-Level Input Voltage on PWMx

1.4

5.5

V

Low-Level Input Voltage on PWMx

0

0.4

V