SDB9HB升压型转换器单节锂驱动IC固定频率
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2024-04-13
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TYPICAL APPLICATION
APPLICATIONS
GENERAL DESCRIPTION
1.20MHz Constant Frequency Operation
1.20MHz,
The SDB9HB
Lithium Ion battery. The SDB9HB
SDB9HB
The SDB9HB
SDB9HB
Rev1.0
1
3V-24V Input
High Efficiency
Boost
White
LED
Driver
High Efficiency: Up to 90%
Integrated internal Power MOSFET
Drives up to 7 Series WLEDs
Low 200mV Feedback Voltage
Soft-start/Dimming with wide Frequency
Range
UVLO, Thermal Shutdown
Internal Current limit
Over Voltage Protection
Small LC Filter
Minimize the External Component
<1µA Shutdown Current
SOT23-6
Package
Camera Flash White LED
Mobile Phone, Smart Phone LED Backlight
PDA LED
Backlight
Digital Still Cameras
Camcorder
is a step-up converter designed for
driving up to 7
series white LEDs from a single cell
uses current
mode, fixed frequency architecture to regulate an
LED current, which is measured through an
external current sense resistor. Its low 200mV
feedback voltage reduces power loss and
improves efficiency.
includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency. Internal soft
start function can reduce the inrush current. Tiny
package type provide the best solution for PCB
space saving and total BOM cost.
Figure 1. Basic Application Circuit
0
5
10
15
20
0
20
40
60
80
100
I
LED
(mA)
PWM Duty Cycle(%)
LED Current vs. PWM Dimming
F=100kHz
7S1P WLEDs
C
OUT
1μF
R
CS
C
IN
1μF
VIN SW
EN FB
GND
V
IN
V
OUT
L 4.7μH to 22μH
D
OV
7 WLEDs
ShoudingShoudingShoudingShoudingShoudingShoudingShouding
SDB9HB
www.shouding.net
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