TPS65268-Q1: TPS65268-Q1 Enable

Ozan Güney Düşmezer

Part Number: TPS65268-Q1
Other Parts Discussed in Thread: TPS65263,

Tool/software:

I simulate your tina ti model of TPS65263. According to startup power sequence at datasheet, i cannot find true enable times. How can we enable in different times. EN pin tied to the Vin with resistor divider and I understand that EN pin voltage must be larger than 1.2V. Can you give me an application example for adjusting enable sequence?

Thanks.

8 months ago

0 Farheen 8 months ago

TI__Mastermind 20750 points

Hello User,

This part does not belong to out product line. I am moving this to right product line.

Thanks,

Farheen

0 Lucia Gao 7 months ago

TI__Mastermind 30541 points

Dear Sir,

Will you need TPS65263 or TPS65268-Q1 enable sequence guidance? And do you have external control of EN signal? For example, like MCU? If not, what sequence and delay time do you need? Thank you!

BRs

Lucia

0 Ozan Güney Düşmezer 7 months ago in reply to Lucia Gao

Intellectual 300 points

We want to use TPS65268-Q1 for supplying MAX10 FPGA. We need sequence and enable of 1.2V, 2.5V and 3.3V outputs of TPS65268-Q1. Can you give me an application example? Delay time isn't define yet but we need some sequencing structure.

0 Lucia Gao 7 months ago in reply to Ozan Güney Düşmezer

TI__Mastermind 30541 points

Dear Sir,

Pls kindly let me show you an example of how to have sequence for 3 Bucks of TPS65263:

You can take it as an example to help with your design. Thank you!

BRs

Lucia

0 Ozan Güney Düşmezer 7 months ago in reply to Lucia Gao

Intellectual 300 points

SS1, SS2 and SS3 are look same capacitance that is 0.01uF, so when we connect EN3 to SS2, how can we get Vout2 before Vout3? I think i should change SS capacitance values. For second question, should i connect EN pins also Vin?

0 Lucia Gao 7 months ago in reply to Ozan Güney Düşmezer

TI__Mastermind 30541 points

Dear Sir,

Pls kindly let me check and get back to you. Thank you!

BRs

Lucia

0 Lucia Gao 7 months ago in reply to Lucia Gao

TI__Mastermind 30541 points

Dear Sir,

The SS capacitor can be the same. The sequence depends on how you connect SS with EN. For example, you connect EN3 with SS2, we will get Vout3 after Vout2. And for the first Buck you want, you can just leave EN floating. To answer your second question, you don't need to connect EN pins with VIN with resistor divider.

Thank you!

BRs

Lucia

0 Ozan Güney Düşmezer 7 months ago in reply to Lucia Gao

Intellectual 300 points

I don't want to enable TPS65268 from another circuit or MCU. I need only output sequencing so i connect three same SS pin to GND for same output ramp voltages. In order to sequence three buck output, i connect EN pins to Vin with RC network as SLVAEA3 Figure 1 delaying mechanism. Can i delayed or sequenced buck outputs with use this RC network and different ground capacitor?(This capacitor is different from SS capacitors)

0 Lucia Gao 7 months ago in reply to Ozan Güney Düşmezer

TI__Mastermind 30541 points

Dear Sir,

Thanks for your feedback. Pls kindly let me check your question and get back to you during these days. Thank you!

BRs

Lucia

0 Lucia Gao 7 months ago in reply to Lucia Gao

TI__Mastermind 30541 points

Dear Sir,

The method you shared from SLVAE is also a good way to get different sequence. And yes, you can have delayed output with this RC network. Thank you!

BRs

Lucia

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TPS65268-Q1: TPS65268-Q1 Enable