描述 Description

The A4935 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications.

A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7?V and allows the A4935 to operate with a reduced gate drive, down to 5.5?V.

A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation.

Full control over all six power FETs in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power FETs are protected from shoot-through by integrated crossover control and resistor-adjustable dead time.

Bridge current can be measured using an integrated current sense amplifier. This is an uncommitted differential amplifier with a below-ground common mode range allowing it to be used in low-side current sense applications. Gain and offset are defined by external resistors.

Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults. They can be configured to protect the power FETs under most short circuit conditions. Detailed diagnostics are available as a serial data word.

Allegro recommended automotive-qualified Hall latches:?APS122x5?and?APS122x0

特性 Features

? High current 3-phase gate drive for N-channel MOSFETs
? Cross-conduction protection with adjustable dead time
? Top-off charge pump for 100% PWM
? Charge pump for low supply voltage operation
? Uncommitted current sense amplifier
? 5.5 to 50?V supply voltage range
? Compatible with 3.3?V and 5?V logic
? Extensive diagnostic outputs
? Low-current sleep mode

簡(jiǎn)介

A4935屬于集成電路（IC）的電機(jī)驅(qū)動(dòng)器控制器。由制造生產(chǎn)的A4935電機(jī)驅(qū)動(dòng)器，控制器產(chǎn)品屬于電機(jī)驅(qū)動(dòng)器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機(jī)或相關(guān)機(jī)電執(zhí)行器的電源。所實(shí)現(xiàn)的具體功能和特性集根據(jù)預(yù)期負(fù)載和預(yù)期應(yīng)用的特性有很大差異，范圍從用于有刷電機(jī)的簡(jiǎn)單開環(huán)速度控制到基于步進(jìn)電機(jī)的高級(jí)閉環(huán)運(yùn)動(dòng)控制。