TS19450

AC/DC WLED Driver with External MOSFET

Universal High Brightness

6/8

Version: A10

Application Information (Continue)

PWM Dimming

PWM Dimming can be achieved by driving the PWMD pin with a low frequency square wave signal. When the PWM

signal is zero, the GATE driver is turned off and when the PWMD signal if high, the GATE driver is enabled. Since the

PWMD signal does not turn off the other parts of the IC, the response of the TS19450 to the PWMD signal is almost

instantaneous. The rate of rise and fall of the LED current is thus determined solely by the rise and fall times of the

inductor current.

To disable PWM dimming and enable the TS19450 permanently, connect the PWMD pin to VDD