IS32LT3175N数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The IS32LT3175 is a single channel linear programmable current regulator capable of up to 150mA. It integrates a debounce and latch circuit on the channel enable pin (EN) to facilitate the use of a low cost momentary contact switch. The PWM pin can be interfaced to a logic level “courtesy light” signal to directly drive the LED channel. The IS32LT3175P accepts a positive polarity PWM signal while the IS32LT3175N accepts a negative polarity PWM signal.

The device operates as a stand-alone LED driver configurable with external resistors; no microcontroller is required. A single external resistor programs the current level, while two separate resistors independently program the fade in and fade out ramp rate for the channel.

The device integrates a 63 steps fade in and fade out algorithm (Gamma correction) which causes the output LED current to gradually ramp up to the full source value after the EN pin is pulsed. The same controller causes the LED current to gradually ramp down to zero if the EN pin is pulsed while the output channel is ON. The fade ramp can be interrupted mid-cycle before completion of the ramp cycle. The EN pin will accept either a momentary contact switch or logic level signal pulsed low.

The IS32LT3175 is targeted at the automotive market with end applications to include map and dome lighting as well as exterior accent lighting. For 12V automotive applications the low dropout driver can support 1 to 3 LEDs (VF = 3.2V) per channel. It is offered in a small thermally enhanced SOP-8-EP package.

特性 Features

• Operating voltage 5V to 42V
• Single channel current source ▪ Programmable current via a single external resistor ▪ Configurable from 20mA to 150mA
• Momentary contact button EN input ▪ Input is debounced and latched ▪ Higher priority than PWM input ▪ Gamma corrected Fade In/Out algorithm ▪ Pull down resistors set independent fade IN and OUT ramp time
• PWM input pin driven by external PWM source ▪ PWM directly drives the current source ▪ IS32LT3175P – Positive polarity ▪ IS32LT3175N – Negative polarity
• Fault Protection: ▪ OUT pin shorted to GND ▪ ISET pin shorted to GND ▪ Over temperature
• SOP-8-EP package
• Automotive Grade: ▪ IS32LT3175P – AEC-Q100 ▪ IS32LT3175N – AEC-Q100
• Operating temperature range from -40°C ~ +125°C

应用 Application

• Automotive Interior: ▪ Map/Dome light ▪ Puddle lamp in doors ▪ Glove box ▪ Vanity mirror

简介

IS32LT3175N属于集成电路（IC）的LED驱动器。由制造生产的IS32LT3175NLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。