MAX6495应用电路(汽车电源承受输入电压瞬态高达72V的电路)

Many applications in automotive electronics require a supply voltage that remains uninterrupted during momentary power failures. For that purpose, the Figure 1 circuit maintains power to the load regardless of momentary shorts or opens in the supply voltage. The low-current overvoltage-protection IC (MAX6495) also protects the load against transient voltages up to 72V.

Figure 1.This automotive power supply withstands input-voltage transients up to 72V, and maintains a regulated output despite brief shorts and opens in the input supply voltage.
The circuit operates from a nominal 13V input voltage. During momentary power interruptions, the large capacitance at the input to the DC-DC converter (C1) provides ride-through capability by supplying the converter for periods up to 5 milliseconds or so. During a momentary short-circuit of source voltage, the circuit again shields the converter output from interruption by preventing discharge of C1 via the shorted supply.


MAX6495 pdf datasheet