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Power and Dimming LED with TPS54200 and TPS54201

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The TPS54200 and TPS54201 (TPS5420X) devices are 28-V wide input range, 1.5-A maximum output current, synchronous buck LED drivers supporting deep dimming ratio with high dimming accuracy. The TPS5420X supports both analog and PWM dimming mode. Especially, in analog dimming mode, a 1% dimming ratio is easily attained by inputting a PWM signal with 1% duty cycle. This is a welcomed feature in surveillance applications. In some other applications where LED color shift is not allowed, PWM dimming mode may be used. To use this part flexibly, the dimming mechanism implemented inside the TPS5420X is explained in detail, and various dimming methods in applications are discussed as well in this report.