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[FAQ] TPS1H000-Q1: PWMing with TI High-side switches

Part Number: TPS1H000-Q1

The two concerns with PWMing high side switches are thermal dissipation and timing:

  1. In terms of thermal dissipation, our device dissipates a lot of heat during the current limitation phase and thus may not be ideal if you are intending to current limit continuously. If used for current sourcing an LED driver might be a better option.
  2. From a timing perspective, please refer to the switching characteristics in the datasheet to ensure the application functions as expected. 
    1. Do note, if the EN signal goes low within the ton time period, the output might not get to 90%
    2. A switching frequency of 1kHz for example at 5% duty cycle would result in a 50us ON time in a 1ms period. 

High-side switch devices are built for more DC applications, and while we do support up to 2kHz PWM, the duty cycle is also important as the device requires time to respond to the inputs. Our high side switches are not meant for PWM applications higher than 2kHz.
For these applications greater than 2kHz or outside of the previous recommendations, the customer could use a high side switch plus low side switch combination of devices. Then the HSS can remain ON and provide all the protection features while the low side switch can be used for fast PWMs.

For more information on driving PWM loads with TI high-side switches, check out this app note on the subject.