TPS62913-IBB-EVM: TPS62913-IBB-EVM

Angie Wogn

Part Number: TPS62913-IBB-EVM
Other Parts Discussed in Thread: TPS62913

Tool/software:

Hi,

referring to document SLVUC22 pg14 (TPS62913-IBB-EVM Schematic), can I replace SI1902CDL-T1-GE3 with FDG1024NZ (from OnSemi)?FDG1024NZ-D.PDF

Regards,

Angie

4 months ago

0 Colin Chen 4 months ago

TI__Genius 15071 points

Hi Angie,

Lucia gao will reply you later.

Thanks,

Colin

0 Lucia Gao 4 months ago

TI__Mastermind 21690 points

Hi Angie,

What is your input voltage and output voltage, is this the same design as IBB-EVM?

If it's the same, pls also double check what is your Vcc voltage? The main difference between FDG1024NZ and SI1902CDL-T1-GE3 is gate to source voltage rating. When the PG pin output is low, Q2A is low, causing Q2B to see VCC, which causes the SYS_PG signal to be pulled to GND. Thus, whether it can be replaced to the Onsemi will also depends on your Vcc value.

Thanks!

BRs

Lucia

0 Angie Wogn 3 months ago in reply to Lucia Gao

Prodigy 40 points

Hi Lucia,

my design as below.

Input Voltage: +5.2V

Output Voltage: -3.3V

VCC: +5.2V

Is FDG1024NZ good enough to support my design?

Thanks,

Angie

0 Lucia Gao 3 months ago in reply to Angie Wogn

TI__Mastermind 21690 points

Hi Angie,

Thank you for your follow up question. Pls kindly let me check.

BRs

Lucia

0 Lucia Gao 3 months ago in reply to Lucia Gao

TI__Mastermind 21690 points

Hi Angie,

You can use FDG1024NZ.

Thanks!

BRs

Lucia

+1 Angie Wogn 3 months ago

Prodigy 40 points

Noted and thank you Lucia.

Regards,

Angie

0 Angie Wogn 3 months ago in reply to Angie Wogn

Prodigy 40 points

Hi Lucia,

Can you guide me how to calculate the thermal disspiation for Q1 (SI1029X-T1-GE3) and Q2 (SI1902CDL-T1-GE3) based on

Input Voltage: +5.2V

Output Voltage: -3.3V

VCC: +5.2V.

Regards,

Angie

0 Lucia Gao 3 months ago in reply to Angie Wogn

TI__Mastermind 21690 points

Hi Angie,

I would suggest you can reach out to Vishay to see if they have any thermal dissipation calculation tools. Thank you!

BRs

Lucia

0 Angie Wogn 3 months ago in reply to Lucia Gao

Prodigy 40 points

Hi Lucia,

Alternatively, may I know what is the current drawn by Q1 and Q2 individually in the TPS62913 Inverting Buck Boost design with the following configuration? I need this information to run the thermal analysis.

Input Voltage: +5.2V

Output Voltage: -3.3V

VCC: +5.2V.

Regards,

Angie

0 Lucia Gao 3 months ago in reply to Angie Wogn

TI__Mastermind 21690 points

Hi Angie,

Do you need the current through Q1 and Q2 when it's on state? Thank you.

BRs

Lucia

0 Angie Wogn 3 months ago in reply to Lucia Gao

Prodigy 40 points

Hi Lucia,

if current is drawn during the off state, pls. provide the current drawn for Q1 and Q2 for both on and off state.

Thank you,

Angie

0 Lucia Gao 3 months ago in reply to Angie Wogn

TI__Mastermind 21690 points

Hi Angie,

Pls kindly let me check and get back to you during these days.

BRs

Lucia

0 Lucia Gao 3 months ago in reply to Lucia Gao

TI__Mastermind 21690 points

Hi Angie,

Pls kindly let me explain to you how to get the current through Q2A and Q2B. Q1 is similar.

When PG is low, Q2A off (i=0), Q2B on (the current is around Vcc/10k).

When PG is high, Q2A on (the current is around (Vcc+|Vout|)/10k, Q2B off (i=0).

Note that it does not considers the on resistance (it is quite small compared with 10k) of the NMOS, but the results are almost similar.

Thank you!

BRs

Lucia

0 Angie Wogn 3 months ago in reply to Lucia Gao

Prodigy 40 points

Hi Lucia,

thanks for the reply.

Regards,

Angie

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TPS62913-IBB-EVM: TPS62913-IBB-EVM