MCP651-ESLASHMF datasheet(27/44 Pages) MICROCHIP

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DS22146A-page 27

MCP651/2/5

4.7.3

H-BRIDGE DRIVER

Figure 4-15 shows the MCP652 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 (GN)

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

quency responses match well (in magnitude and in

phase). Equation 4-11 shows how to calculate RGT and

RGB so that both op amps have the same DC gains;

GDM 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 MCP652

VIN

VOT

½ MCP652

RGB

VOB

VDD/2

RGT

GDM

VOT VOB

–

VIN VDD 2

⁄

–

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

≥

≡

RGT

GDM 2

⁄

() 1

–

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

RGB

GDM 2

⁄

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

VOT V

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

VDD

-----------

VOT V

–

GDM VIN

VDD

-----------

–

⎝⎠

⎛⎞

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