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MPC17531A Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MPC17531A Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 19 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor 17531A FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 17531A is a monolithic dual H-Bridge ideal for portable electronic applications to control bipolar step motors and brush DC motors such as those found in camera len assemblies, camera shutters, and optical disk drives. The device features an on-board charge pump, as well as built-in shoot-through current protection and undervoltage shutdown. The 17531A 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 17531A can simultaneously drive two brush DC motors or one bipolar step motor. 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 terminals. LOGIC INPUT CONTROL (IN1A, IN1B, IN2A, AND IN2B) These logic input terminals control each H-Bridge output. IN1A logic HIGH = OUT1A HIGH. However, if all inputs are taken HIGH, the outputs bridges are both tri-stated (refer to Table 6, Truth Table, page 9). POWER SAVE (PSAVE) The PSAVE terminal is a HIGH = TRUE power save mode input. When PSAVE = HIGH, all H-Bridge outputs (OUT1A, OUT1B, OUT2A, and OUT2B) are tri-stated (High-Z), regardless of logic inputs (IN1A, IN1B, IN2A, and IN2B) states, and the internal charge pump and low voltage detection current are shut off to save power. H-BRIDGE OUTPUT (OUT1A, OUT1B, OUT2A, AND OUT2B) These terminals provide connection to the outputs of each of the internal H-Bridges (see Figure 2, 17531A Simplified Internal Block Diagram, page 2). MOTOR DRIVE POWER SUPPLY (VM1 AND VM2) The VM terminals carry the main supply voltage and current into the power sections of the IC. This supply then becomes controlled and/or modulated by the IC as it delivers the power to the loads attached between the OUTput terminals. All VM terminals must be connected together on the printed circuit board. CHARGE PUMP (C1L AND C1H, C2L AND C2H) These two pairs of terminals, the C1L and C1H and the C2L and C2H, connect to the external bucket capacitors required by the internal charge pump. The typical value for the bucket capacitors is 0.1 µF. PREDRIVER POWER SUPPLY (CRES) The CRES terminal is the output of the internal charge pump. Its output voltage is approximately three times of VDD voltage. The VCRES voltage is power supply for the internal predriver circuit of H-Bridges. POWER GROUND (PGND) Power ground terminals. They must be tied together on the PCB. LOGIC GROUND (LGND) Logic ground terminal. |
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Similar Description - MPC17531A |
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