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MPC17550EV Datasheet(PDF) 9 Page - Motorola, Inc |
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MPC17550EV Datasheet(HTML) 9 Page - Motorola, Inc |
9 / 15 page Analog Integrated Circuit Device Data Freescale Semiconductor 9 17550 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 17550 is a monolithic quad H-Bridge ideal for portable electronic applications containing multiple bipolar stepper motors and/or brush DC motors. The device features an on- board DC/DC converter to provide gate-drive voltages, as well as level-shifting circuitry. The control logic translates the input signals to the gate-driver circuitry while providing cross- conduction suppression. The 17550 has four operating modes: Forward, Reverse, Brake, and Tri-Stated (High Impedance). The MOSFETs comprising the output bridge have a total source+sink RDS(ON) ≤ 1.2 Ω. The 17550 can simultaneously drive four brush DC motors or two bipolar stepper motors. The drivers are designed to be PWM’ed at frequencies up to 200 kHz. FUNCTIONAL TERMINAL DESCRIPTION LOGIC SUPPLY (VDD) The VDD terminal carries the logic supply voltage and current into the logic sections of the IC. VDD has an undervoltage threshold. If the supply voltage drops below the undervoltage threshold, the output power stage switches to a tri-state condition. When the supply voltage returns to a level that is above the threshold, the power stage automatically resumes normal operation according to the established condition of the input control terminals. CONTROL SIGNAL INPUT FOR H-BRIDGE, F=FORWARD, R= REVERSE (INAF, INAR, INBF, INBR, INCF, INCR, INDF, INDR) These logic input control terminals control each H-Bridge output; e.g., IN*F logic HIGH = HB*F HIGH; likewise, IN*R logic HIGH = HB*R HIGH. However, if both “F” and “R” inputs are taken HIGH, the associated bridge’s outputs are both tri- stated (refer to Table 5, Truth Table, page 8). OUTPUT ENABLE (OE) OE terminal is a LOW = TRUE enable input. When OE = HIGH, all H-Bridge outputs are tri-stated (high impedance) regardless of logic inputs states. OUTPUT OF H-BRIDGE, R=REVERSE, F=FORWARD (HBAF, HBAR, HBBF, HBBR, HBCF, HBCR, HBDF, HBDR) These terminals provide connection to the outputs of each of the internal H-Bridges (see Figure 2, 17550 Simplified Internal Block Diagram, page 2). POWER SUPPLY VOLTAGE CONNECTION FOR MOTORS A, B, C, D (VMA, VMB, VMC, VMD) The VM terminals carry the main supply voltage and current into the power sections of the 17550. This supply then becomes controlled and/or modulated by the 17550 as it delivers the power to the loads attached between the H-Bridge output terminals. All VM terminals must be connected together on the printed circuit board. DC/ DC CONVERTER SWITCHING TRANSISTOR OUTPUT (LX) The LX terminal is the open-drain output of the internal DC/DC converter circuit. It is the junction for the external inductor and the anode of the external Schottky diode. GATE-DRIVER CIRCUIT POWER SUPPLY (VG) The VG terminal is the input terminal for the gate-drive voltage. It can be supplied from the built-in DC/DC converter or from an external source. GROUND TERMINALS (GND, AGND, PGND) All ground terminals must be tied together on the PCB. POWER STANDBY MODE CONTROL (PSB) The PSB input controls the functioning of power output stages (the H-Bridges). When this input signal turns Low, the output stages and Internal DC/DC Converter which makes Gate Voltage are disabled and all the outputs are opened (High Impedance). When this input signal turns High, the output stages and Internal DC/DC Converter are enabled and the H-Bridges operate normally. |
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