Datasheet > IS31LT3172

IS31LT3172

更新时间： 2024-11-12 01:21:47

品牌	Logo	应用领域
美国芯成 - ISSI		驱动
页数	文件大小	规格书
19页	458K
描述
10-TO-200MA CONSTANT-CURRENT LED DRIVER

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中文翻译

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数据手册

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IS31LT3172 数据手册

IS31LT3172/73

10-TO-200MA CONSTANT-CURRENT LED DRIVER

July 2016

GENERAL DESCRIPTION

FEATURES

The IS31LT3172 and IS31LT3173 are adjustable

linear current devices with excellent temperature

stability. A single resistor is all that is required to set

the operating current from 10mA to 200mA. The

devices can operate from an input voltage from 2.5V

to 42V with a minimal voltage headroom of 1V

(typical). Designed with a low dropout voltage; the

device can drive LED strings close to the supply

voltage without switch capacitors or inductors.



Low-side current sink

- Current preset to 10mA

- Adjustable from 10mA to 200mA with external

resistor selection



Wide input voltage range from

- 2.5V to 42V (IS31LT3173)

- 5V to 42V (IS31LT3172)

with a low dropout of typical 1V

Up to 10kHz PWM input (IS31LT3173 only)

Protection features:

The IS31LT3172/73 simplifies designs by

providing a stable current without the additional

requirement of input or output capacitors,

inductors, FETs or diodes. The complete constant

current driver requires only a current set resistor

and a small PCB area making designs both

efficient and cost effective.



- 0.26%/K negative temperature coefficient at

high temp for thermal protection



Up to 1.8W power dissipation in a small SOP-8-

EP package

RoHS compliant (Pb-free) package

The EN pin (3) of the IS31LT3172 can be tied to

Vbat or BCM PWM signal for high side dimming.

The EN Pin (3) of the IS31LT3173 can function as

the PWM signal input used for low side dimming.

APPLICATIONS



Architectural LED lighting

As a current sink it is ideal for LED lighting

applications or current limiter for power supplies.

Channel letters for advertising, LED strips for

decorative lighting



Retail lighting in fridge, freezer case and

vending machines

The device is provided in a lead (Pb) free, SOP-8-EP

package.

Emergency lighting (e.g. steps lighting, exit way

sign etc.)

TYPICAL APPLICATION CIRCUIT

Figure 1 Typical Application Circuit

Integrated Silicon Solution, Inc. – www.issi.com

Rev. C, 07/01/2016

12 3 4 5 6 7...19

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