Allegro MicroSystems公司的A6862是N溝功率MOSFET驅(qū)動器,具有三個獨立的浮置柵極驅(qū)動輸出,集成的電荷泵控制器穩(wěn)壓器在電源電壓降至4.5V時有足夠的柵極驅(qū)動電壓大于7.5V,電源電壓4.5V-50V,兩個單獨的激勵輸入,單個相位使能輸入,主要用在ASIL系統(tǒng)的三相斷開,電動助力轉(zhuǎn)向系統(tǒng)(EPS),電制動和三相固態(tài)繼電器驅(qū)動器.本文介紹了A6862主要特性和優(yōu)勢,框圖,典型應(yīng)用框圖,以及演示板電路圖,材料清單和PCB設(shè)計圖.

The A6862 is an n-channel power MOSFET driver capable of controlling MOSFETs connected as a 3-phase solid-state relay in phase-isolaTIon applicaTIons. It has three independent floaTIng gate drive outputs to maintain the power MOSFETs in the on-state over the full supply range with high phase-voltage slew rates. An integrated charge pump regulator provides the above battery supply voltage necessary to maintain the power

MOSFETs in the on-state conTInuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V with 100 kΩ gate source resistors.

The three gate drives can be controlled by a single logic-level input. In typical applications, the MOSFETs will be switched on within 8 μs and will switch off within 1 μs.

Two independent activation inputs can be used to put the A6862 into a low-power sleep mode with the charge pump disabled. Undervoltage monitors check that the pumped supply voltage and the gate drive outputs are high enough to ensure that the MOSFETs are maintained in a safe conducting state.

The A6862 is supplied in a 16-lead TSSOP (LP) with exposed pad for enhanced thermal dissipation. They are lead (Pb) free, with 100% matte-tin leadframe plating.

A6862主要特性和優(yōu)勢:

• Three floating n-channel MOSFET drives

• Maintains VGS with 100 kΩ gate-source resistors

• Integrated charge pump controller

• 4.5 to 50 V supply voltage operating range

• Two independent activation inputs

• Single phase-enable input

• VCP and VGS undervoltage protection

• 150°C ambient (165°C junction) continuous

A6862應(yīng)用:

• 3-phase disconnect for ASIL systems up to level D

• Electric power steering (EPS)

• Electric braking

• 3-phase solid-state relay driver

圖1. A6862框圖

圖2. A6862典型應(yīng)用框圖

圖3. A6862演示板外形圖

圖4. A6862演示板電路圖

A6862演示板材料清單:

圖5. A6862演示板PCB設(shè)計圖(1)

圖6. A6862演示板PCB設(shè)計圖(2)

圖7. A6862演示板PCB設(shè)計圖(3)

圖8. A6862演示板PCB設(shè)計圖(4)