HFC0400
Fixed Frequency Flyback Controller
with Ultra-low No Load Power Consumption
The Future of Analog IC Technology
DESCRIPTION
HFC0400 is a fixed-frequency current-mode
controller with built-in slope compensation. It
targets medium-power, off-line, flyback, switch-
mode power supplies. At light loads, the
controller freezes the peak current and reduces
its switching frequency down to 25kHz to offer
excellent light-load efficiency.
At very light loads, the controller enters burst
mode to achieve very low standby power
consumption.
HFC0400 offers frequency jittering to help
dissipate energy generated by conducted noise.
HFC0400 also has an X-cap discharge function
to discharge the X-cap when the input is
unplugged.
HFC0400 features multiple protections that
include thermal shutdown (TSD), VCC under-
voltage lockout (UVLO), overload protection
(OLP), over-voltage protection (OVP), and
brown-out protection.
HFC0400 is available in an SOIC8-7A package.
FEATURES
Fixed-frequency current-mode control with
built-in slope compensation
Frequency foldback down to 25kHz at light
loads
Burst mode for low standby power
consumption
Frequency jitter to reduce EMI signature
X-cap discharge function
Internal high-voltage current source
VCC under-voltage lockout with hysteresis
(UVLO)
Brown-out protection on HV pin
Overload protection with programmable
delay
Thermal shutdown (auto-restart with
hysteresis)
Latch-off for external over-voltage protection
(OVP) and over-temperature protection
(OTP) on TIMER pin
Short-circuit protection
Programmable soft start
AC/DC adapters for notebook computers,
tablets, and smartphones
Offline battery chargers
LCD TV s and monitors
APPLICATIONS
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
HFC0400 Rev. 1.0
11/28/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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