TPSM63606: Check the schematic of tpsm63606

Hi,

Please provide the schematic here so the appropriate applications engineer can help assist you.

Regards,

Jimmy

ti power card v1.pdf

I've received the schematic and will provide feedback as soon as I am done with the review.

For U6 and U7, there may need to be more output capacitance. I would suggest having 2 x 27uF on the output because DC bias effects on the capacitor will reduce the effective capacitance lower than expected. This is a good starting point and you can further evaluate for desired output ripple and load transient response. 

For U5 (buck converter to inverting buck boost) please refer to this app note on design recommendation and guidance (https://www.ti.com/lit/an/snva856a/snva856a.pdf). The first thing I would look out for is the input to output conversion. In IBB the input voltage pin will experience voltage of VIN - ( - VOUT). If your output voltage is -15V, and the recommended maximum input voltage is 36V, then the input voltage can not be larger than 21V or else it will be above the input range. Also current drawn in IBB is larger than in regular buck, so your application will most likely not be able to draw 6A which is the max current rating of the buck converter. Refer to Section 4 for operating considerations when using IBB 

Regards,

Jimmy

Thanks for your reply!

According to the snava856a.pdf

In the datasheet, the maximum is 42V. Is this right? By the way, if the input is 24V and the output is -15V, what will happen? Also, if the input is 24V, can you recommend a chip which can output -15V and pin compatible with tpsm63606. Thanks!