Linear LED Drivers | CAT4240

LED ドライバ、ブースト・コンバータ、6 W

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Overview

CAT4240 は、LED 駆動に最適な、精度の高い定電流を提供する DC-DC ステップアップコンバータです。1 MHz の一定スイッチング周波数の動作によりデバイスを外部のセラミック・キャパシタやインダクタに使用することができます。直列に接続された LED を、外付け抵抗 R1 設定で調整された電流で駆動します。CAT4240 高電圧出力段は最大 10 個の直列 LED を含む中規模でパネルが大きいディスプレイの駆動に最適です。 LED 調光は DC 電圧、ロジック信号またはパルス幅変調 (PWM) 信号を使用して行うことができます。シャットダウン入力ピンにより「ゼロ」静止電流でデバイスを省電力モードにすることができます。 サーマル保護や過電流制限に加え、このデバイスは「オープン LED」故障の状況では極低電力動作モードになります。

  • LED Drive for Portable Electronics
  • GPS Navigation Systems
  • Portable Media Players
  • Digital Still Cameras
  • Switch Current Limit 750 mA
  • Drives High Voltage LED strings (38 V)
  • Up to 94% Efficiency
  • Low Quiescent Ground Current 0.6 mA
  • 1 MHz Fixed Frequency Low noise Operation
  • Soft start “in-rush” current limiting
  • Shutdown current less than 1 µA
  • Open LED Overvoltage Protection
  • Automatic Shutdown at 1.9 V (UVLO)
  • Thermal overload protection

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LEDs in Parallel, Max #

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CAT4240TD-GT3

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Obsolete

CAD Model

Pb

A

H

P

TSOT-23-5

419AE

1

260

REEL

3000

N

5.5

350

10

1

Price N/A

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