STLD20D

更新时间： 2024-11-24 22:42:39

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
8页	72K
描述
WHITE LED POWER SUPPLY

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中文翻译

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数据手册

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STLD20D 数据手册

STLD20D

WHITE LED POWER SUPPLY

ASD™

PRELIMINARY DATA

FEATURES

APPLICATION

■

High efficiency above 80%

Can drive up to 4 LEDs in series from 2.8V

supply

Constant LED current regulation

Integrated LED disconnect switch that cuts the

LEDs branch in shutdown mode

Constant switching frequency

Stable current regulation across the total input

voltage range

Supply voltage rejection

Inherent soft start by limiting the peak inductor

current

Peak inductor current adjustability (STLD20D-

C8 only)

Shutdown pin with possibility of PWM dimming

control

Over voltage and over temperature protection

with automatic restart

Low shutdown current < 1µA

Small external inductor (10µH, height < 2mm)

Tiny ceramic external capacitor

Can be supplied by a Li-ion battery - V_INrange:

2.5Vdc to 5Vdc

■

White Led supply for LCD backlight

Mobile phone

PDA and organizers

■

Any handsets powered from 2.8V to 4.2V

DESCRIPTION

■

The STLD20D is a constant switching frequency

boost regulator with specific features to supply up

to 4 white LEDs in series. A stable LED current

regulation, from 2.8V to 4.2V, is achieved by sens-

ing the LED current through a low ohmic shunt re-

sistor R_LED(see figure 1). The device also

includes a supply rejection circuit that prevent any

kind of flickering effect on the display during dy-

namic supply voltage variation. A LED disconnect

switch cut the LED branch to reduce the current

consumption in shutdown mode. The maximum

peak inductor current can be programmed. The

STLD20D includes often numerous features and in-

novative design circuit that allows getting an efficien-

cy above 80% across the total supply voltage range.

■

Figure 2: Efficiency versus input voltage

(I_LED=20mA; T_amb=25°C)

Figure 1: Basic connection

Efficiency (%)

L = 10µH

V_BATT

Cin = 2.2µF

Cout = 1µF

V_OUT

R_SET(*)

I^LED= 20mA

R_SET

V_IN

STLD20D

LDS

SHDN

D: STM BAT20J

R_LED

GND

2.5

3.5

4.5

L: Murata LQH32CN100K33

(*) STLD20D-C8 only

Input voltage (Vdc)

Table 1: Order Codes

Part Number

STLD20D-C8

STLD20D-DEF

Marking

L2D

Package

SOT23-8L

QFN 3x3 8L

L2D

October 2004

REV. 2

1/8

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

12 3 4 5 6 7 8

中文翻译

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与STLD20D相关器件

型号	品牌	获取价格	描述	数据表
STLD20D_06	STMICROELECTRONICS	获取价格	White LED power supply
STLD20D-C8	STMICROELECTRONICS	获取价格	WHITE LED POWER SUPPLY
STLD20D-DEF	STMICROELECTRONICS	获取价格	WHITE LED POWER SUPPLY
STLD257N4F7AG	STMICROELECTRONICS	获取价格	汽车级N沟道40 V、1.27 mOhm典型值、120 A STripFET F7功率MO
STLD3081	ETC	获取价格	Optoelectronic
STLD40D	STMICROELECTRONICS	获取价格	White led power supply for large display backlight
STLD40DPMR	STMICROELECTRONICS	获取价格	White led power supply for large display backlight
STLD40DPUR	STMICROELECTRONICS	获取价格	White Led Power Supply For Large Display Backlight
STLD41	STMICROELECTRONICS	获取价格	White LED driver for mid-size LCD display backlight
STLD41PUR	STMICROELECTRONICS	获取价格	White LED driver for mid-size LCD display backlight

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