SLVAE30E February 2021 – March 2021 TPS1H000-Q1 , TPS1H100-Q1 , TPS1H200A-Q1 , TPS1HA08-Q1 , TPS25200-Q1 , TPS27S100 , TPS2H000-Q1 , TPS2H160-Q1 , TPS2HB16-Q1 , TPS2HB35-Q1 , TPS2HB50-Q1 , TPS4H000-Q1 , TPS4H160-Q1
Smart High Side Switches are often used in a central module to control the battery input current flow into a LED driver module as shown in Figure 5-1. In each case, the current in each of the LED strings or arrays is controlled by the LED lighting module rather than directly from the Smart High Side Switch. In the simplest case, there is no additional MCU in the LED module and the LEDs are either discrete ON/OFF only or are controlled through a separate PWM signal. In more sophisticated modules the central module can communicate the light pattern and intensity over protocols like CAN or LIN.
LED modules typically include switching DC/DC converters that convert the input battery voltage into a controlled source. In most cases there will be significant input capacitance (of the order of 100 µF-300 µF) at the input to the switching converter. In order to choose the right Smart High Side Switch and its configuration when driving LED modules with large capacitance please refer to the capacitive load driving section of this document in Section 3.