AL8807A(2012) Просмотр технического описания (PDF) - Diodes Incorporated.

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Компоненты Описание

производитель

AL8807A
(Rev.:2012)

HIGH EFFICIENCY LOW EMI WIDE ANALOG DIMMING RANGE 36V 1A/1.3A BUCK LED DRIVER

Diodes Incorporated. 

AL8807A

Pin Descriptions

Pin Name

SW

GND

CTRL

SET

VIN

EP

N/C

Pin Number

SOT25 MSOP-8EP

Function

1

5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.

2

2, 3 GND Pin

LED current Analog Dimming Control Input. – No PWM dimming function.

Connected to internal 2.5V VREF via 50kΩ resistor. So if left open circuit VCTRL = VREF = 2.5V and 100%

LED current is achieved - giving nominal average output current IOUTnom = 0.1/RS

3

4

For Analog dimming drive with analog voltage < 2.5V

(0.25V < VCTRL< 2.5V adjusts output current from 10% to 100% of IOUTnom. Device will dim the LED current

lower than this level but at reduced accuracy. Some devices will not totally turn off the LED current.

Soft-start can be implemented by connecting a capacitor to CTRL pin. The amount of soft-start is

dependent on ramp-up of input supply voltage and capacitor on CTRL pin. See apps section.

4

1

Set Nominal Output Current Pin. Configure the output current of the device.

5

8

Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see

applications section for more information.

Exposed pad/TAB.

—

EP It should be connected to GND and thermal mass for enhanced thermal impedance.

It should not be used as electrical ground conduction path.

—

7

No connection – may be connected to GND.

Functional Block Diagram

VIN

SET

SW

AL8807A

CTRL

50k

GND

5V Voltage

Regulator

Analog

Dimming

Control

VREF VCTRLH

2.5V 2.55V

–

+

UVLO

–

+

OTP

AL8807A

Document number: DS35990 Rev. 1 - 2

2 of 20

www.diodes.com

September 2012

© Diodes Incorporated

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