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I want to design a BDC driving board with Infineon BTN8962.(Infineon BTN8962 is a half of H-bridge IC)

As we all know,BDC driving circuit is just like this: enter image description here

In this picture,We set a High side MOS(QA) as Open,and set a High side(QC) and a Low side(QB) MOSes as close.We just have to ouput a PWM signal to control the speed of BDC. enter image description here enter image description here But when I use Infineon BTN8962,I found I cound not do this unless using the INH pin as PWM signal input pin.(But in fact,this pin is sleep mode enable pin.It can close its MOS.)

Which pin should I set as PWM signal output pin?

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    \$\begingroup\$ -1 for being stupid and posting this to meta. Learn how a place works before barging in and engaging. \$\endgroup\$
    – Olin Lathrop
    Jul 12, 2016 at 20:41
  • \$\begingroup\$ I am new in motor driving \$\endgroup\$
    – 梁政焘
    Jul 13, 2016 at 2:14

1 Answer 1

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INH pin , should be tied to Vcc via a pull-up resistor.

The PWM should be supplied on the IN pin . you can also add a pull down here , to ensure the that incase of any failure in PWM , the input stays low .

Now in order to make a complete H bridge you would need 2 BTN8962 IC.

you have 3 options to drive them:

  1. Use 2 PWM signals . Any driving method is possible in software.
  2. Use 1 PWM signal and a NOT gate to generate the opposite in what is called locked antipahse.
  3. Use 1 PWM signal and 2 direction signals , use 2 AND gates to connect the in what is called Sign magnitude drive.

choose depending on the availability of Pins in the micro-controller.

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  • \$\begingroup\$ Tying the INH pin to GND turns the device off. \$\endgroup\$
    – pgvoorhees
    Jul 12, 2016 at 14:13
  • \$\begingroup\$ you are right , i meant it should be initially at ground and set high by micocontoller , i will update \$\endgroup\$
    – ElectronS
    Jul 12, 2016 at 14:24
  • \$\begingroup\$ I don't understand at all.In the Page 22 of the datasheet,if I want to drive this BDC in a direction,would I?: 1.Set the INH as HIGH 2.Set the IN(right) as HIGH 3.Set the IN(left) as PWM signal. It's right?But,when the PWM signal is in HIGH level,the pMOS(left) is on.Will it cause a braking event? \$\endgroup\$
    – 梁政焘
    Jul 12, 2016 at 14:45
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    \$\begingroup\$ my friend you didnot understand i simplied the answer, INH is always HIGH for both BTN8962 ICs. if you want to go right , set IN1 =0 , and IN2 PWM . if you want to go left , set IN2=0 , and IN1 to PWM. \$\endgroup\$
    – ElectronS
    Jul 12, 2016 at 14:56
  • \$\begingroup\$ This is the correct answer. \$\endgroup\$
    – pgvoorhees
    Jul 12, 2016 at 15:10

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