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MC34063A: power management review

Jaeseung Jeong1
Prodigy 130 points
Part Number: MC34063A
Other Parts Discussed in Thread: TPS561201, TPS61170, TPS61165

The PCB is divided into two parts.

power source: AC adapter 15V and the battery 11.1V (3x3.7V) 

DC-DC converter:  MC34063A for step-up/down.

I am not sure whether it is efficient to distribute power as shown below.

And the mc34063a is the appropriate choice. Please give me some advice

.

  • 0
    TI__Mastermind 46905 points

    Hi Jaeseung,

    the battery voltage could be 9V ~ 13.5V depend on the SOC. do you need stable 12V for the motor?

    I would suggest to change the structure as below:

    1. connect the 15V adapter to the output of the battery. (add a schottky diode between the battery and the adapter to prevent reverse current)

    2. a step-up from the battery, only for the 500mA motor.

    3. the buck converter could be TPS561201 for 5V and 3.3V

    4. for the LED back-light, do you need a boost converter as TPS61170 or a LED driver as TPS61165.

    The MC34063 is quite old device, large solution size and low efficiency.

    TPS561201

     

  • 0 in reply to Jasper Li
    Prodigy 130 points

    Hi Jasper, 

    Thanks for your kind reply. 

    I have some additional questions.

    1. Should I connect the diode like the picture below?

    2. How can I step up to 28V using TPS61165? 

       I think its output is 38V fixed, it can be adjusted by pwm dimming through CTRL pin, is it right? 

  • 0 in reply to Jaeseung Jeong1
    TI__Mastermind 46905 points

    Hi Jaeseung,

    please place the diode from battery to the 15V output. the output of the TPS61170 is only to drive the motor. the input of the TPS61170 is from the power bus.

    the 38V is the Over voltage protection. the actual output voltage is control the FB pin and the CTRL pin signal.