LED大功率升降压恒流驱动芯片外围超简单可PWM模拟调光高效率驱动方案

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LED大功率升降压恒流驱动芯片外围超简单可PWM模拟调光高效率驱动方案
) J4 A% f) I7 Q: ?1 B2 [  F! d AP5503 宽电压 LED 升降压型恒流芯片
0 {  L8 ]2 ?1 O3 c; J& R
  h9 g! J, u3 r3 P$ h6 j2 u5 m描述
& S9 X2 Y8 R# I3 qAP5503是电流模式DC / DC转换器，具有
用于驱动LED的外部电源NMOS。的
AP5503在降压，升压和升压模式下用作LED驱动器
  j, u/ ~+ Y  o降压-升压模式。 LED电流可通过120mV感测电阻器在外部编程。用
500KHz工作频率，外部电感和
. N- i1 B7 I; y7 y2 @* M, Z输入/输出电容器都可以很小。调光罐
* H5 N7 d* F9 K+ y: T. n可以是模拟，PWM或PWM转换为模拟
& p. L& g( [- r, L) l与外部电容器。
5 ~5 m" _/ D+ @& {AP5503采用MSOP-10（FD）封装。
! T% h8 h& r2 q- j6 U特征
„高电压：VIN最高60V，VOUT最高60V
降压，升压或降压-升压操作
„具有500KHz和200KHz的电流模式PWM
开关频率
„易于调光：使用一个外部电容器将模拟，PWM或PWM转换为模拟
软启动以避免涌入电流
- t" ]* H3 c# @0 L  ~! n/ X可编程过压保护至极限
/ _4 Q# V7 c: C1 s/ a% h输出电压
VIN欠压锁定和热关断
MSOP-10（FD）封装
; i" X% ]7 ^' S; I  e2 ~) k. A应用领域
4 V% Z" C* X4 P& J( eGPS，便携式DVD背光
„台灯和房间照明
' A$ `* R3 z0 t  M8 m工业显示屏背光
* G" z1 V8 P6 X/ \# v Description
9 Y9 b# G- S9 o; a! ?The AP5503 is a current mode DC/DC converter with
: f  E1 K* F  Z( F: loutside power NMOS designed to drive LEDs. The
AP5503 operates as a LED driver in buck, boost and
; z* V4 \8 W: A' t% tbuck-boost mode. The LED current is externally programmable with a 120mV sense resistor. With a
500KHz operating frequency, the external inductor and
9 b, |* j/ I9 ^6 S% D1 {input/output capacitors can all be small. Dimming can
be either analog, PWM, or PWM converting to analog
; V# j& N; |9 M1 u7 R3 q  Bwith an external capacitor.
' E) {  G1 ~" U" _6 x$ H3 pThe AP5503 is available in MSOP-10 (FD) package.
Features
„ High Voltage : VIN up to 60V, VOUT up to 60V
# L9 q$ f5 M6 ^2 s" o„ Buck, Boost or Buck-Boost Operation
, e5 ^: I, [1 @) }„ Current Mode PWM with 500KHz and 200KHz
Switching Frequency
5 O8 _# [7 Y3 Z„ Easy dimming : Analog, PWM or PWM Converting to Analog with One External Capacitor
„ Soft Start to Avoid Inrush Current
„ Programmable Over Voltage Protection to Limit
Output Voltage
# E3 ?- p! ]: L- ]„ VIN Under Voltage Lockout and Thermal Shutdown
6 Q3 y; L) e( a1 {: E* V# c„ MSOP-10 (FD) Package
/ N5 b: n* {; g" I9 l% h  LApplications
„ GPS, Portable DVD Backlight
„ Desk Light and Room Lighting
# Q9 @( M& c/ p! D„ Industrial Display Backlight
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