TPSM5D1806: MODE2 Resistor

Karthik Shenoy

Part Number: TPSM5D1806

Hi team,

I am making use of Dual Output Configuration. 12V(Input) to 1.8V/6A and 1.5V/6A. Here switching frequency(1000kHz) for the given Output voltages is not matching from Table 7-3 and 7-5.

over 2 years ago

0 David_Daniels over 2 years ago

TI__Mastermind 19970 points

How is it not matching? What are measuring? What resistor value are you using? do you have an oscilloscope plot and schematic

0 Karthik Shenoy over 1 year ago in reply to David_Daniels

Prodigy 160 points

Hi David,

Our requirement is 1.8V/6A and 1.5V/6A with a switching frequency of 1500kHz. For this what should be the value of MODE2 Resistor and enable bottom resistor(Renb)?

0 David_Daniels over 1 year ago in reply to Karthik Shenoy

TI__Mastermind 19970 points

For the MODE2 resistor, Go to TPSM5D1806 product folder go to the bottom to webench for to design the supply

Link to Webench

The TPSM5D1806 has an enable pullup on enable pin and by default will operate when the input voltage is greater than the uvlo threshold.

The external enable resistor is for adjusting the vin start voltage, section 7.3.10 discusses.

If you want to start at 9V, the Renb will be ~13.9kOHm is the Rent is 100kOhm.

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TPSM5D1806: MODE2 Resistor