JAJSMG4A June 2023 – September 2023 TPS922052 , TPS922053 , TPS922054 , TPS922055
PRODUCTION DATA
The TPS92205x family supports PWM input signals with ultra-narrow pulse width down to 150 ns for direct PWM dimming. The PWM dimming mode is enabled when the ADIM/HD input pin is always high and the EN/PWM input pin is configured by a PWM input signal.
In PWM dimming mode, when the PWM input signal at the PWM pin turns from low to high, the internal NMOS FET starts switching and the inductor current rises to the determined value. The LED current is then regulated at the determined value as long as the PWM input signal stays high. When the PWM input signal turns from high to low, the internal FET is turned off causing the inductor current falling to zero. The internal FET maintains off and the LED current stays zero as long as the PWM input signal stays low.