HF900 Datasheet | Monolithic Power Systems

DESCRIPTION The HF900 is a flyback regulator with an integrated 900V MOSFET. Requiring a minimum number of external ponents, the HF900 provides excellent power regulation in AC/DC applications that require high reliability. These applications include smart meters, large appliances, industrial controls, and products powered by unstable AC grids. The regulator uses peak-current-mode control to provide excellent transient response and easy loop pensation. When the output power falls below a given level, the regulator enters burst mode to lower the standby power consumption. The MPS proprietary 900V monolithic process enables over-temperature protection (OTP) on the same silicon of the 900V power FET, offering precise thermal protection. Also, it offers a full suite of protection features such as VCC undervoltage lockout, over-load protection, overvoltage protection, and short-circuit protection. The HF900 is designed to minimize electromagnetic interference for wireless munication in home and building automation applications. The operating frequency is programmed externally with a single resistor, so the power supply’s radiated energy can be designed to avoid the interference with wireless munication. In addition to the programmable frequency, the HF900 employs a frequency jittering function that not only greatly reduces the noise level but also reduces the cost of the EMI filter. The HF900 is available in SOIC14-11 and PDIP8-7EP packages. FEATURES - Internal Integrated 900V MOSFET - Programmable Fixed Switching Frequency up to 300k Hz - Frequency Jittering - Current-Mode Operation - Internal High-Voltage Current Source - Low Standby Power Consumption via Active Burst Mode - Internal Leading Edge Blanking - Built-In Soft-Start Function - Internal Slope pensation - Built-In Input Over-Voltage Protection - Over-Temperature Protection (OTP) - VCC Under-Voltage Lockout with Hysteresis - Over-Voltage Protection on VCC - Time-Based Overload Protection - Short-Circuit...