RH3845MK

The RH3845 is a high voltage, synchronous, current mode controller used for medium to high power, high efficiency supplies. It offers a wide 7.5V to 60V input range. With an external V_CC supply, the input can drop to 4V and continue to operate after startup. An onboard regulator simplifies the biasing requirements by providing IC power directly from V_IN.

Additional features include adjustable fixed operating frequency synchronizable to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, low shutdown current, short-circuit protection and a programmable soft-start, and overtemperature protection.

Note that Burst Mode^® operation, available in the LT3845, is not available in the RH3845 version.

RH3845MW-1 operates in pulse skip mode where reverse inductor current is disallowed. Regulation is achieved at light loads by skipping cycles. Operation in pulse skip mode yields higher light load efficiency, but higher output voltage ripple.

RH3845MW-2 operates in forced continuous mode where reverse inductor current is allowed. This mode of operation maintains a constant frequency over all loads making it suitable for noise sensitive applications. However, forced continuous mode is less efficient at light loads.

We partner with third party vendors who assemble and test packaged products with RH Dice inside.

APPLICATIONS

• Intermediate Bus Power Supplies
• Avionics and Control Systems
• Distributed Power Converters