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MTS2916A データシート(PDF) 8 Page - Microchip Technology |
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MTS2916A データシート(HTML) 8 Page - Microchip Technology |
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8 / 20 page  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 L Current flows from OUTxB to OUTxA H 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 Pb Pa H H L L Nb Na SENSE OUTA OUTB VLOAD Pb Pa H H L L Nb Na SENSE OUTA OUTB VLOAD Pb Pa H H L L Nb Na SENSE OUTA OUTB RS RS RS a) b) c) TABLE 3-2: POWER BRIDGE GATE CONTROL TRUTH TABLE I0I1 PHASE Overi TOFF Case/Mode gna gpa gnb gpb 00/01/10 1 0 0 Forward ON L LH H 00/01/10 1 x 1 Forward OFF L H H H 00/01/10 0 0 0 Reverse ON H HL L 00/01/10 0 x 1 Reverse OFF H HL H 11 x x x No Current/ Coasting LH LH Legend: Bold = Active MOS Transistors, Overi = Overcurrent flag, TOFF = Channel TOFF State Flag |
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