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參數(shù)資料
| 型號： | STLD20D-DEF |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | WHITE LED POWER SUPPLY |
| 中文描述： | 白色LED電源 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 67K |
| 代理商： | STLD20D-DEF |
1/8
STLD20D
WHITE LED POWER SUPPLY
PRELIMINARY DATA
October 2004
REV. 2
FEATURES
■
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
IN
range:
2.5Vdc to 5Vdc
Table 1: Order Codes
Part Number
STLD20D-C8
STLD20D-DEF
Marking
L2D
L2D
Package
SOT23-8L
QFN 3x3 8L
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
ASD
Figure 1: Basic connection
L = 10μH
D
Cout = 1μF
Cin = 2.2μF
I
= 20mA
LED
R
SET
V
BATT
R
LED
V
OUT
V
IN
LDS
FB
D: STM BAT20J
L: Murata LQH32CN100K33
SW
GND
(*) STLD20D-C8 only
SHDN
R
(*)
SET
STLD20D
APPLICATION
■
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)
78
79
80
81
82
83
84
85
86
87
88
2.5
3
3.5
4
4.5
5
Input voltage (Vdc)
Efficiency (%)
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