HFC0500
Fixed Frequency Flyback Controller
with Ultra-low No Load Power Consumption
HFC0500 Rev. 1.1 www.MonolithicPower.com 1
7/13/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
HFC0500 is a fixed-frequency current-mode
controller with internal slope compensation. It is
specifically designed for the medium-power, off-
line, flyback, switch-mode power supplies.
HFC0500 is a green-mode highly efficient
controller. 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.
HFC0500 offers frequency jittering to help
dissipate energy generated by conducted noise.
HFC0500 employs overpower compensation
function to narrow the difference of over power
protection point between low line and high line.
HFC0500 also has X-cap discharge function to
discharge the X-cap when the input is
unplugged. This aids in lowering no load power.
HFC0500 features multiple protections that
include thermal shutdown (TSD), VCC under-
voltage lockout (UVLO), overload protection
(OLP), over-voltage protection (OVP), and
brown-out protection.
HFC0500 is available in an SOIC8-7A package.
FEATURES
• Fixed-frequency current-mode control with
internal slope compensation
• Frequency foldback down to 25kHz at light
loads
• Burst mode for low standby power
consumption, meeting EuP Lot 6
• Frequency jitter to reduce EMI signature
• X-cap discharge function
• Adjustable overpower compensation
• Internal high-voltage current source
• VCC under-voltage lockout with hysteresis
(UVLO)
• Brown-out protection on HV
• 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
• Latch-off for Vcc over voltage protection
• Short-circuit protection
• Programmable soft start
APPLICATIONS
• AC/DC power for small and large
appliances
• AC/DC adapters for notebook computers,
tablets, and smart phones
• Offline battery chargers
• LCD TVs and monitors
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.
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of Monolithic Power Systems, Inc.