MTS2916A datasheet(7/20 Pages) MICROCHIP

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DS22259C-page 7

MTS2916A

2.1

Current Detection Selection

(I01, I02, I11, I12)

Comparator input for current threshold detection. The

voltage across the sense resistor is fed back to this

input through the low pass filter RcCc. The power tran-

sistors are disabled when the sense voltage exceeds

the reference voltage of the selected comparator.

When this occurs, the current decays for a time set by

RtCt (TOFF = 1.1 RtCt).

2.2

Current Flow Direction Selection

(PHASE1, PHASE2)

Logic input to select the direction of current flow

through the load. A “HIGH” logic signal level causes

load current to flow from OUTxA to OUTxB. A “LOW”

logic level causes load current to flow from OUTxB to

OUTxA.

2.3

Current Sense Reference

(VREF1, VREF2)

Reference voltage for current sense comparator.

Determines the level of output current detection

together with sensing resistor and inputs I0x, I1x.

2.4

Output Stage OFF Time

(RC1, RC2)

A parallel RtCt network connected to this pin sets the

OFF time of the power transistors. The monostable

pulse generator is triggered by the output of the current

sense comparator.

2.5

Ground Terminal (GND)

Logic supply ground. Only the driver current flows out

of this pin; there is no high current. Minimize voltage

drops between this pin and the logic inputs.

2.6

Logic Supply Voltage (VLOGIC)

Connect VLOGIC to the logic source voltage. Decouple

the supply with a 0.1 µF ceramic capacitor mounted

close to the VLOGIC and GND terminals.

2.7

Current Sense Comparator Input

(COMPIN1, COMPIN2)

Current sense comparator input.

2.8

Current Sense Input

(SENSE1, SENSE2)

Connection to lower sources of output stage for inser-

tion of current sense resistor.

2.9

Output Stage

(OUT1A, OUT2A, OUT1B, OUT2B)

Output connection to “A” side and “B” side of motor

windings.

2.10

Load Supply Voltage (VLOAD)

Connect VLOAD to the motor positive voltage supply.

The motor current is supplied through this pin and the

selected output transistors.

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