Linear Technology Corporationannounces the availability of a MIL-STD-1275D compliant surge stopper solution, demonstrated on evaluation board DC2150A. MIL-STD-1275D is a standard created by the United States Department of Defense, specifying the steady state and transient voltage characteristics of a military ground vehicle’s 28Vdc power supply. When faced with the stringent surge, spike and ripple waveforms specified in MIL-STD-1275D, DC2150A limits the output voltage to a safe 44V. For most applications, satisfying the standard is as simple as placing the DC2150A circuit in front of a 44V tolerant device. DC2150A employs surge stopper ICs LTC4366 and LT4363, controlling series N-channel MOSFETs, reducing the solution size and cost compared to traditional shunt circuits utilizing bulky capacitors, fuses, inductors and transient voltage suppressors.
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DC2150A is designed to withstand input transients up to ±250V and to provide a minimum of 4A current to the load in all conditions except the ±7V ripple condition when the available current is reduced to 2.8A. The N-channel MOSFETs are protected against output overloads by current limiting. Sustained overvoltage or overcurrent conditions turn off the circuit after a timer delay; the circuit turns on automatically after a cool-down cycle. Thermal protection circuitry turns off the LT4363 controlled MOSFET when its temperature exceeds 105 degrees C.
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