A2918 - DUAL FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems에서 제조한 전자 부품 A2918은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.

A2918의 기능 및 특징 중 하나는 "DUAL FULL-BRIDGE PWM MOTOR DRIVER" 입니다.

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A2918 기능

DUAL FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems

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2918 OUT1A OUT2A E2 OUT2B LOAD SPLY SENSE 2 1 2 3 4 5 6 7 8 9 DUAL FULL-BRIDGE PWM MOTOR DRIVER The A2918SWH and A2918SWV motor drivers are designed to drive both windings of a bipolar stepper motor or bidirectionally control two dc motors. All bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 1.5 A. For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage and sensing resistor. A PHASE input to each bridge determines load current direction. Active low ENABLE inputs control the four drivers in each bridge. The bridges includ

Contents of page 4 out of 8 pages :

2918 DUAL FULL-BRIDGE PWM MOTOR DRIVER PWM OUTPUT CURRENT WAVEFORM V PHASE + I OUT 0 – ITRIP td toff Dwg. WM-003-1A APPLICATIONS INFORMATION PWM Current Control The A2918SWH/V dual bridges are designed to drive both windings of a bipolar stepper motor. Output current is sensed and controlled independently in each bridge by an external sense resistor (RS), an internal comparator, and an internal monostable multivibrator. When the bridge is turned ON, current increases in the motor winding and it is sensed by RS until the sense voltage (VSENSE) reaches the level set at the comparator’s input: ITRIP = VREF/10 RS The comparator then triggers the monostable which turns OFF the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) because of internal logic and switching delays. This delay (td) is 2 µs typically. After turn-off, the motor current decays, circulating through the ground clamp diode and sink transistor. The source driver’s OFF time toff, and therefore the magnitude of the current decrease, is determined by the monostable’s external RC timing components, where toff = RTCT within the range of 20 kΩ to 100 kΩ and 200 pF to 500 pF. When the source driver is re-enabled, the winding current (the sense voltage) again is allowed to rise to the comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level. Special circuitry has

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부품번호	상세설명 및 기능	제조사
A29160A	Boot Sector Flash Memory	AMIC Technology
A29160B	Boot Sector Flash Memory	AMIC

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