A6862主要特性和優(yōu)勢_汽車三相固態(tài)繼電器MOSFET驅(qū)動方案

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)