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W-6238 bảng dữ liệu(PDF) 1 Page - Copal Electronics

tên linh kiện W-6238
Giải thích chi tiết về linh kiện  High Efficiency 10 LED Boost Converter
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nhà sản xuất  COPAL [Copal Electronics]
Trang chủ  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6238 bảng dữ liệu(HTML) 1 Page - Copal Electronics

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W-6238
© NIDEC COPAL ELECTRONICS CORP.
1
Doc. No. MD-5019 Rev. D
Characteristics subject to change without notice
FEATURES
Drives High Voltage LED strings (38V)
Up to 87% Efficiency
Low Quiescent Ground Current 0.6mA
Adjustable Output Current
1MHz Fixed Frequency Low noise Operation
Soft start “in-rush” current limiting
Shutdown current less than 1µA
Open LED Overvoltage Protection
Automatic Shutdown at 1.9V (UVLO)
Thermal overload protection
Thin SOT23 5-Lead (1mm max height)
APPLICATIONS
GPS Navigation Systems
Portable Media Players
Handheld Devices, Digital Cameras
Portable Game Machines
ORDERING INFORMATION
Part Number
Package
Quantity
per Reel
Package
Marking
W-6238TD-GT3
TSOT23-5
Green*
3000
MU
* NiPdAu Plated Finish
For Ordering Information details, see page 13.
DESCRIPTION
The W-6238 is a DC/DC step-up converter that delivers
an accurate constant current ideal for driving LEDs.
Operation at a fixed switching frequency of 1MHz allows
the device to be used with small value external ceramic
capacitors and inductor. LEDs connected in series are
driven with a regulated current set by the external resistor
R1. LED currents up to 40mA can be supported over a
wide range of input supply voltages up to 5.5V, making
the device ideal for battery-powered applications. The
W-6238 high-voltage output stage is perfect for driving
mid-size and large panel displays containing up to ten
white LEDs in series.
LED dimming can be done by using a DC voltage, a logic
signal, or a pulse width modulation (PWM) signal. The
shutdown input pin allows the device to be placed in
power-down mode with “zero” quiescent current.
In addition to thermal protection and overload current
limiting, the device also enters a very low power
operating mode during “Open LED” fault conditions. The
device is housed in a low profile (1mm max height) 5-lead
thin SOT23 package for space critical applications.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
5-Lead Thin SOT23
(1mm max height)
High Efficiency 10 LED Boost Converter
VIN
FB
2
3
1
SHDN
5
4
SW
GND
VIN
W-6238
VIN
LD
VOUT
R1
15
20mA
(300mV)
4.7µF
C1
0.22µF
C2
FB
SHDN
SW
GND
ON
47µH
OFF
L: Sumida CDC5D23B-470
D: Central CMDSH05-4
C2: Taiyo Yuden UMK212BJ224 (rated 50V)


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