MCP621T datasheet(27/44 Pages) MICROCHIP

Il numero della parte	MCP621T

Spiegazioni elettronici	20 MHz, 2.5 mA Op Amps with mCal

PDF	44 Pages

Scroll/Zoom	100%

Produttore elettronici	MICROCHIP [Microchip Technology]

Homepage	http://www.microchip.com

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27 / 44 page

DS22188A-page 27

MCP621/2/5

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 (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:

Equation 4-12 gives the resulting common mode and

differential mode output voltages.

EQUATION 4-12:

VIN

VOT

RGB

VOB

VDD/2

RGT

½ MCP622

–

DD 2

⁄

–

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

2 V/V

≥

≡

DM 2

⁄

() 1

–

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

DM 2

⁄

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

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

-----------

–

DM VIN

-----------

–

⎝⎠

⎛⎞

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