Datasheet

MCP621/1S/2/3/4/5/9

4.7.3 H-BRIDGE DRIVER

Figure 4-15 shows the MCP622 dual op amp used as

a H-bridge driver. The load could be a speaker or a DC

motor.

FIGURE 4-15: H-Bridge Driver.

This circuit automatically makes the noise gains (G

)

equal, when the gains are set properly, so that the

frequency responses match well (in magnitude and in

phase). Equation 4-11 shows how to calculate R

and

so that both op amps have the same DC gains;

needs to be selected first.

EQUATION 4-11:

Equation 4-12 gives the resulting Common mode and

Differential mode output voltages.

EQUATION 4-12:

½ MCP622

–

⁄

–

-------------------------------- 2 V /V

≥≡

⁄

()1–

---------------------------------=

⁄

-------------------=

V+

---------------------------

-----------=

V–

-----------–

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