# H-bridge using IR2184 chip.

Joined Sep 28, 2021
190

Hi all, I want to implement a H-bridge driver circuit. May I know how to make some changes to the circuit above so that it forms a full-H-bridge using transistors. I attached my LT Spice file below Thank you for reading.

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#### crutschow

Joined Mar 14, 2008
29,785
You just duplicate the complete circuit for the other two transistors.

For a 0.2ms period signal, C1 has to provide the current the transistor base through R1, so the C1R1 time-constant should be at least 10 times that period or 2ms.
This gives a C1 value of of 2ms / 5k = 400nF.
I would use at least 1µF.

Joined Sep 28, 2021
190
You just duplicate the complete circuit for the other two transistors.

For a 0.2ms period signal, C1 has to provide the current the transistor base through R1, so the C1R1 time-constant should be at least 10 times that period or 2ms.
This gives a C1 value of of 2ms / 5k = 400nF.
I would use at least 1µF.

Hi sir, is this correct? I get a really bad output at R4

#### ronsimpson

Joined Oct 7, 2019
2,063

#### ronsimpson

Joined Oct 7, 2019
2,063
Look at Q4. Its input Base or Gate is at near 0V all the time. But it is tied to the input of Q1 who's Base or Gate goes from 0V to 20+15V. (if it has a Gate) or 0 to 20+0.7 for a Base.

#### crutschow

Joined Mar 14, 2008
29,785
is this correct?
No.
As I stated, you need to duplicate the complete circuit.

Joined Sep 28, 2021
190
No,
You need a second IC. IR2184.
Hmm if use a second IC, would the timing be synchronised properly because it is not from 1 ic? Can you modify my LT Spice file attached for better understanding? Thanks, sir

#### ronsimpson

Joined Oct 7, 2019
2,063

If you post your files include the "ir2184.lib"