PT4115E-50V/1.5A Step-down High Brightness LED Driver(50V Version)  DataSheet
PT4115E应用说明  Application Note
GENERAL DESCRIPTION
The PT4115E is a continuous conduction mode
inductive step-down converter, designed for driving
single or multiple series connected LED efficiently
from a voltage source higher than the total LED chain
voltage. The device operates from an input supply
between 6V and 50V and provides an externally
adjustable output current of up to 1.5A.
The PT4115E includes the power switch and a
high-side output current sensing circuit, which uses an
external resistor to set the nominal average output
current, and a dedicated DIM input accepts either a DC
voltage or a wide range of pulsed dimming. Applying a
voltage of 0.3V or lower to the DIM pin turns the
output off and switches the device into a low current
standby state.
The PT4115E is available in SOT89-5 package.
FEATURES
Simple low parts count
Wide input voltage range: 6V to 50V
High efficiency (up to 97%)
Up to 1.5A output current
Single pin on/off and brightness control using DC voltage or PWM
Up to 1MHz switching frequency
Typical 3% output current accuracy
Inherent open-circuit LED protection
Inherent Rcs open protection
High-Side Current Sense
Hysteretic Control: No need compensation
Adjustable Constant LED Current
Thermal shutdown
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
SELV lighting
LCD TV backlighting
DC 输入：24V/48V ,AC 输入：24VAC 常规应用:DC 输出：10V/1A
1. 产品概况
1.1 特点
很宽的输入电压范围：6V到50V
效率高达97%
3%的输出电流精度
复用DIM引脚进行LED开关、模拟调光与PWM调光
RCS开路保护
LED开路保护
热关断保护
SOT89-5封装
1.2 概述
PT4115E是一款工作在连续电感电流导通模式的降压型恒流驱动芯片，用于驱动一颗或多颗串联LED，输出电流精度高达3%。PT4115E输入电压范围从6V到50V，输出电流可调,最大可达1.5A。其采用高端电流采样电阻设置LED平均电流，并通过DIM引脚进行模拟调光和PWM调光。
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