Automotive 3-Phase MOSFET Driver
Description
A4935 Automotive 3-Phase MOSFET Driver
FEATURES AND BENEFITS
▪ 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
PACKAGE: 48-pin LQFP with exposed thermal pad (suffix JP)
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 resistoradjustable 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.
Not to scale
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Typical Application
VBAT
A8450
Regulator
VBAT
DSP or
Microcontroller
Control Diagnostics
A4935
Current Sense
3-Phase BLDC Motor
4935-DS, Rev.
10 MCO-0000781
June 17, 2022
A4935
Automotive 3-Phase MOSFET Driver
DESCRIPTION (CONTINUED)
Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults.
They can be configured to protect the power FETs under most short circuit ...
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