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

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)

• 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. For

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.