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RT8458D - Constant Current PWM Buck Controller

Datasheet Summary

Description

The RT8458D is a PWM controller with an internal high side gate driver.

Because of the Buck topology, the input voltage for the Buck system is only limited by the voltage rating of the external MOSFET.

Features

  • a 160kHz fixed frequency oscillator, an internal.
  • 220mV precision reference, and a PWM comparator with latching logic. The accurate output LED current is achieved by an averaging current feedback loop and the LED current dimming can be easily controlled via the ACTL pin. The RT8458D also has multiple features to protect the controller from fault conditions, including Under Voltage Lockout (UVLO), Over Current Protection (OCP) and Over Voltage Protection (OVP). Additionally, to ensure the.

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Datasheet preview – RT8458D

Datasheet Details

Part number RT8458D
Manufacturer Richtek
File Size 203.50 KB
Description Constant Current PWM Buck Controller
Datasheet download datasheet RT8458D Datasheet
Additional preview pages of the RT8458D datasheet.

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Full PDF Text Transcription

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® RT8458D High Voltage, High Efficiency, Constant Current PWM Buck Controller for LED Lighting General Description The RT8458D is a PWM controller with an internal high side gate driver. Because of the Buck topology, the input voltage for the Buck system is only limited by the voltage rating of the external MOSFET. It is used for step down converters by well controlling the external MOSFET and regulating a constant output current. The output duty cycle of the RT8458D can be up to 100% for wider input voltage application. The RT8458D also features a 160kHz fixed frequency oscillator, an internal −220mV precision reference, and a PWM comparator with latching logic.
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