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                ghaytweyhtoo 发布

                基于A6986I的38V、5W同步等压转换器评估▼板,具有单一的隔离输出

                STEVAL-A6986IV2

                 
                设计简介

                The STEVAL-A6986IV2 evaluation board is based on ST A6986I (automotive 38 V, 5 W synchronous iso-buck converter for isolated applications).
                [STEVAL-A6986IV2 IMAGE]
                The primary output voltage can be accurately adjusted, whereas the isolated secondary output is generated by a transformer. No optocoupler is required.
                The primary sink capability (typ. 1.9 A) allows a proper energy transfer to the secondary side as well as enables a tracked soft-start of the secondary output.
                The control loop is based on a peak current mode architecture and the device operates in forced PWM.
                The 300 ns blanking time filters oscillations generated by the transformer leakage inductance and makes the solution more robust.
                Pulse by pulse current sensing on both power elements implements an effective constant current protection on the primary side. Due to the primary reverse current limit, the secondary output is protected against short-circuit events. The secondary voltage is stabilized over current by using a power transistor and a shunt voltage reference (TL431).
                The evaluation board generates an isolated voltage (around 5 V, easily adjustable), especially suitable for applications requiring a single isolated supply.

                所有功能
                AEC-Q100 qualified
                Operating temperature range: -40 °C to 135 °C for Tj
                Designed for iso-buck topology
                4 to 38 V operating input voltage
                Primary output voltage regulation
                No optocoupler required
                1.9 A typical sink peak primary current capability
                Peak current mode architecture in forced PWM operation
                300 ns blanking time
                8 µA IQ-SHTDWN
                Adjustable fSW and synchronization
                Embedded primary output voltage supervisor
                Adjustable soft-start time
                Internal primary current limiting
                Overvoltage protection
                RDS(on) HS = 180 mΩ, RDS(on) LS = 150 mΩ
                Thermal shutdown

                参考设计图片
                 
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                A6986I 降压稳压∮器 Automotive 38 V, 5W synchronous iso-buck converter 点击下载
                 
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