® RT8458A High Efficiency PWM Buck LED Driver Controller General Description The RT8458A is a PWM controller with an integrated high side gate driver.
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 RT8458A can be up to 100% for wider input voltage application, such as E27 and PAR30 off-line LED lighting products.
The RT8458A also features a 47kHz 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 ...

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