Rev. 1.00

4

���i� ��� �011

Rev. 1.00

5

���i� ��� �011

HT7L4091

Universal Step-Down PWM Control

For High Brightness LED Lighting Control

Pin Assignment

VIN

CS

GND

GDR

RT

LD

VDD

PDM

HT7L4091

8 SOP-A

1

2

3

4

8

7

6

5

Pin Description

Pin Name

I/O

Description

VIN

I

In�ut vo�tage �in

CS

I

LED st�ing cu��ent sense in�ut

GND

—

Powe� g�ound

GDR

O

Gate d�ive� fo� the exte�na� MOSFET

PDM

I

PWM dimming �in

��so functions as enab�e in�ut �in.

VDD

O

Positive Powe� su���y

Used for the internal circuits except the gate driver circuit. A 0.1μF capacitor must be

connected between the VDD and the GND pins.

LD

I

Linea� dimming �in

Set the current sense threshold as long as the voltage on this pin is less than 250mV

(ty�.).

RT

I

Osci��ato� cont�o� �in

� �esisto� is connected between the RT and the GND �ins to set the off-time.

Absolute Maximum Ratings

Output Current Peak ...................................................................................................................... 1A

Storage Temperature Range ......................................................................................-65°C ~ +150°C

Junction Temperature Range.....................................................................................-40°C ~ +150°C

Power Dissipation at Ta<25 °C .................................................................................................. 0.6W

ESD Voltage Protection, Human Body Model............................................................................ 6KV

ESD Voltage Protection, Machine Model .................................................................................. 400V

Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum

Ratings” may cause substantial damage to the device. Functional operation of this device at other

conditions beyond those listed in the specification is not implied and prolonged exposure to extreme

conditions may affect device reliability.