HF900
900V Offline Switching Regulator
HF900 Rev. 1.0 www.MonolithicPower.com 1
8/4/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
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 V
CC
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.
FEATURES
• 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)
• V
CC
Under-Voltage Lockout with Hysteresis
• Over-Voltage Protection on V
CC
• Time-Based Overload Protection
• Short-Circuit Protection (SCP)
APPLICATIONS
• Smart Power Meters
• Large Appliances
• Industrial Controls
• All AC/DC Supplies Sold Where Power Grid
may be Unstable
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. Fo
MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
