MTS2916A datasheet(8/20 Pages) MICROCHIP

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MTS2916A

DS22259C-page 8

 2010-2013 Microchip Technology Inc.

3.0

FUNCTIONAL DESCRIPTION

The circuit is designed to drive the two windings of a

bipolar stepper motor, and can be divided into two iden-

tical channels (channel 1 and channel 2) and protection

circuitry for overtemperature and undervoltage. The

functionality of a channel and protection circuitry is

presented in the following sections.

3.1

Power Bridge Operation

Each motor winding is driven by an H-type bridge

consisting of two N- and two P-transistors that allow the

current to flow in both winding directions, depending on

the value of the PHASE signal (Table 3-1). The

H-bridge can be set in five configurations that are

related to the digital inputs PHASE, I0 and I1, and to the

current sensed. These configurations are shown in

Table 3-2.

FIGURE 3-1:

Power Bridge Control (PHASE = H/Forward).

TABLE 3-1:

CURRENT DIRECTION CONTROL

PHASE

Output Current

Current flows from OUTxB to OUTxA

Current flows from OUTxA to OUTxB

Legend: a) Bridge ON, b) Source OFF, c) All OFF/Coasting

Note: For PHASE = L/Reverse, invert A and B in drawings.

VLOAD

SENSE

OUTA

OUTB

VLOAD

SENSE

OUTA

OUTB

VLOAD

SENSE

OUTA

OUTB

TABLE 3-2:

POWER BRIDGE GATE CONTROL TRUTH TABLE

I0I1

PHASE

Overi

TOFF

Case/Mode

gna

gpa

gnb

gpb

00/01/10

Forward ON

00/01/10

Forward OFF

00/01/10

Reverse ON

00/01/10

Reverse OFF

No Current/

Coasting

Legend: Bold = Active MOS Transistors, Overi = Overcurrent flag, TOFF = Channel TOFF State Flag

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