High Current Half-Bridge with Over Current Shutdown

The project presented here is a versatile high voltage Half-Bridge with Over-Current Shutdown. The project is built using LT1158 IC from Analog Devices. It is suited for many applications as listed below. A single input pin on the LT1158 synchronously controls two N-channel power MOSFETs IRF3710 in a totem pole configuration. Unique adaptive protection against shoot-through currents eliminates all matching requirements for the two MOSFETs. This greatly eases the design of high-efficiency motor control and switching regulator systems. A continuous current limit loop in the LT1158 regulates short-circuit current in the top power MOSFET. Higher start-up currents are allowed as long as the MOSFET V_DS does not exceed 1.2V. By returning the FAULT output to the enable input, the LT1158 will automatically shut down in the event of a fault and retry when an internal pull-up current has recharged the enable capacitor. An on-chip charge pump is switched in when needed to turn on the top N-channel MOSFET continuously. Special circuitry ensures that the top side gate drive is safely maintained in the transition between PWM and DC operation. The gate-to-source voltages are internally limited to 14.5V when operating at higher supply voltages. The circuit requires a single PWM signal, duty cycle 0 to 99%, frequency 0 to 100Khz. Working supply range 12V to 24V DC.

High Current Half-Bridge with Over Current Shutdown – [Link]

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