MCP622-E/MF 데이터 시트보기 (PDF) - Microchip Technology

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MCP622-E/MF

20 MHz, 2.5 mA Op Amps with mCal

Microchip Technology 

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.

VIN

½ MCP622

RF

RF

VOT

RGT

RL

RGB

RF

VOB

VDD/2

½ MCP622

FIGURE 4-15:

H-Bridge Driver.

This circuit automatically makes the noise gains (GN)

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 RGT and

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

GDM needs to be selected first.

EQUATION 4-11:

GDM ≡ V----VI--N-O----–T----–V----D-V---D-O---B-⁄--2-- ≥ 2 V/V

RGT = (---G----D----M---R---⁄-F-2----)---–-----1-

RGB = G-----D--R--M--F---⁄---2-

Equation 4-12 gives the resulting common mode and

differential mode output voltages.

EQUATION 4-12:

V----O----T----+------V----O---B-- = V----D----D--

2

2

VOT – VOB

=

GDM

⎛

⎝

VIN

–

-V---D2----D--⎠⎞

MCP621/2/5

© 2009 Microchip Technology Inc.

DS22188A-page 27

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