LM2576: Negative Boost Regulator

Yuto Sakai

Part Number: LM2576

Hi,

Data Sheet P.18 A circuit example of Negative Boost type is shown in Figure 25.
How should I decide the peripheral constant of this circuit?
Is there an application note that describes the design policy?

Best regards,
Yuto Sakai

over 6 years ago

0 Frank De Stasi over 6 years ago

TI__Guru 72545 points

We do not have formal design material for this circuit.
I would suggest to start with the circuit given and then modifying
to you requirements and careful testing.

0 Yuto Sakai over 6 years ago in reply to Frank De Stasi

Mastermind 6100 points

Hi Frank-san,

Thank you for your reply.
Is there an application note that describes design guidelines for Negative boost converter?
It is not necessary to use LM2576.

Best regards,
Yuto Sakai

0 Frank De Stasi over 6 years ago in reply to Yuto Sakai

TI__Guru 72545 points

I am not sure; you will have to search our website.

0 Yuto Sakai over 6 years ago in reply to Frank De Stasi

Mastermind 6100 points

Hi Frank-san,

Thank you for your reply.
Since the data sheet and conditions are different, it is impossible to decide whether to use it.
Would you advise whether a negative boost circuit using the LM2576 can be used under the following conditions?

[conditions]
Vin = -5.0 V
Vout = -6.0 V
Iout = 15 mA MAX

Best regards,
Yuto Sakai

0 Frank De Stasi over 6 years ago in reply to Yuto Sakai

TI__Guru 72545 points

I think that these conditions sound reasonable. It would have to be tested by the customer.

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LM2576: Negative Boost Regulator