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900V Offline Switching Regulator
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The HF900 is a flyback regulator with an integrated 900V MOSFET. Requiring a minimum number of external components, 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 compensation. 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 under-voltage lockout, over-load protection, over-voltage protection, and short-circuit protection.
The HF900 is designed to minimize electromagnetic interference for wireless communication 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 communication.
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.
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- Internal Integrated 900V MOSFET
- Programmable Fixed Switching Frequency up to 300kHz
- 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 Compensation
- 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 Protection (SCP)
EVHF900-P-00A Evaluation Kit 85VAC/60Hz~420VAC/60Hz, 13.5V/300mA; 8V/50mA Off-line SWITCHING Regulator Evaluation Board
The HF900 is a flyback regulator with a 900V MOSFET integrated, targeting high AC input voltage application. The switching frequency can be programmed with one external resistor
The EVHF900-P-00A Evaluation Board is designed to demonstrate the capabilities of HF900 and is also designed for off-line high input voltage (85VAC~420VAC) application with triple outputs (13.5V/300mA, 8V/50mA, 8V/50mA). The 8V output rail can power the LDO for MCU power supply.
The EVHF900-P-00A has an excellent performance and meets EN55022 conducted EMI requirements easily with frequency jittering function. It has various protections like Over Temperature Protection (OTP), VCC Under Voltage Lockout (UVLO), Over Load Protection (OLP), Over Voltage Protection (OVP), Short Circuit Protection (SCP) and built-in PRO pin for extra protection setting.