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AN44

更新时间： 2024-11-14 03:18:47

品牌	Logo	应用领域
捷特科 - ZETEX		驱动器卤素灯
页数	文件大小	规格书
6页	117K
描述
A high power LED driver for low voltage halogen replacement

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AN44 数据手册

AN44

A high power LED driver for low voltage halogen replacement

Introduction

LED lighting is becoming more popular as a replacement technology for Halogen low voltage

lighting, primarily because of the low efficiency, reliability and lifetime issues associated with

Halogen bulbs.

Discussed below is a novel approach for driving high power LED's as a replacement for low

voltage halogen lighting systems.

A typical schematic diagram is shown in Figure 1.

Figure 1 Schematic diagram

Operation

Please refer to the typical schematic diagram in Figure 1.

On period, T

The ZXSC300 turns on Q1 until it senses 19mV (nominal) on the I

pin.

SENSE

The current in Q1 to reach this threshold is therefore 19mV/R1, called I

PEAK

With Q1 on, the current is drawn from the battery and passes through C1 and LED in parallel.

Assume the LED drops a forward voltage V . The rest of the battery voltage will be dropped across

L1 and this voltage, called V(L1) will ramp up the current in L1 at a rate di/dt = V(L1)/L1, di/dt in

Amps/sec, V(L1) in volts and L1 in Henries.

The voltage drop in Q1 and R1 should be negligible, since Q1 should have a low R

always drops less than 19mV, as this is the turn-off threshold for Q1.

and R1

DS(on)

= V + V(L1)

= I

x L1/ V(L1)

PEAK

Issue 2 - July 2006

www.zetex.com

12 3 4 5 6

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