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W-6238 bảng dữ liệu(PDF) 1 Page - Copal Electronics |
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W-6238 bảng dữ liệu(HTML) 1 Page - Copal Electronics |
1 / 14 page 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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