AL1791/1792/1793/1794

Document number:37957 Rev. 3 - 2

7 of 18

www.diodes.com

September 2015

© Diodes Incorporated

AL1791/1792/1793/1794

Functional Block Diagram

Figure 5. Functional Block Diagram of AL1792/1793/1794 (Note 4)

Note:

4. PWM2 and LED2 are not applicable to AL1791. PWM3 and LED3 are not applicable to AL1791 and AL1792. PWM4 and LED4 are not applicable to

AL1791, AL1792, and AL1793.

Symbol

Parameter

Ratings

Units

ESD

HBM

Human Body Model ESD Protection

4,000

V

CDM

Charged Device Model ESD Protection

1,000

V

Input Voltage

30

V

Enable Voltage, PWM Voltage

7

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 EN and PWMx

2.5

5.5

V

Low-Level Input Voltage on EN and PWMx

0

0.4

V

Pre_regulator

Bandgap

Bias current

UVLO

EN

OSC

Dimming Signal

Process

Protection Function

REF

PWM1

PWM2

PWM3

PWM4

EN

VIN

LED1

LED2

LED3

LED4

FAULTB

GND

VDD

Current Reference

Current Ratio

Circuit

PWM Control

Current Ratio

Circuit

PWM Control

Current Ratio

Circuit

PWM Control

Current Ratio

Circuit

PWM Control

LED Power Judgement

Function

LEDPG