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LP3906: SW1 and SW2

Mark Philip Felipe
Genius 10820 points
Part Number: LP3906
Other Parts Discussed in Thread: LP3907

Hi Team, seeking some assistance.

The following is an article about SW1, SW2 OPERATION that can be found on page 20 of the data sheet for the part.

"The default output voltage for each buck converter is factory programmable."

1. Does this article mean that the default output voltage can be programmed by the customer at the factory?

2. I have confirmed that PWM mode can be forced the PWM mode through the setting of the buck control register.

    But is it possible to set the PWM mode through factory programming without accessing the register?

3. It was confirmed that a 13MHz clock should be input to the SYNC pin when using the external clock synchronization function.

    But, in our system, it is difficult to generate a synchronized clock of 13MHz.

    If I input the 12.288MHz clock or a clock of a different frequency to the SYNC pin as an external clock, is there any problem in operation?

Thank you

-Mark

  • 0
    TI__Genius 10490 points

    Hi Mark,

    1. 'Factory' refers to the TI factory, which can program default settings via OTP (One-Time-Programming). Unfortunately this cannot be done at the customer side for this device. Please note this is an older device for which TI can no longer support new factory programmed options. The customer can choose from available options on page 4 of the datasheet (The LP3907 has similar functionality with additional options).

    2. PWM mode cannot be set to forced through factory programming.

    3. Given the internal clock divider, the internal oscillator frequency would scale down to 1.89 MHz. This should not cause any operation problems, but may affect performance related to switching frequency, such as converter efficiency. 

    Thanks,

    Gerard