HFC0511
Fixed-Frequency Flyback Controller with
Ultra-Low, No-Load Power Consumption
HFC0511 Rev. 1.0 www.MonolithicPower.com 1
5/3/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
DESCRIPTION
The HFC0511 is a fixed-frequency, current-
mode controller with internal slope
compensation specifically designed for
medium-power, offline, flyback, switch-mode
power supplies. The HFC0511 is a highly
efficient green-mode controller. At light loads,
the controller freezes the peak current and
reduces its switching frequency down to 27kHz
to achieve excellent light-load efficiency. At very
light loads, the controller enters burst mode to
achieve very low standby power consumption.
The HFC0511 offers frequency jittering to help
dissipate energy generated by the conducted
noise.
The HFC0511 employs an over-power
compensation function to narrow the difference
of the over-power protection point between the
low line and high line.
The HFC0511 also has an X-cap discharge
function to discharge the X-capacitor when the
input is unplugged. This helps lower the power
at no load.
Full protection features include thermal
shutdown, VCC under-voltage lockout (UVLO),
overload protection (OLP), over-voltage
protection (OVP), and brown-out protection.
The HFC0511 is available in a SOIC8-7A
package.
FEATURES
Fixed-Frequency, Current-Mode Control
with Internal Slope Compensation
Frequency Foldback down to 27kHz at Light
Load
Burst Mode for Low Standby Power
Consumption, Meeting EuP Lot 6
Frequency Jitter to Reduce EMI Signature
X-Cap Discharge Function
Adjustable Over-Power Compensation
Internal High-Voltage Current Source
VCC Under-Voltage Lockout (UVLO) with
Hysteresis
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
(OVP)
Short-Circuit Protection (SCP)
Programmable Soft Start (SS)
Available in a SOIC8-7A Package
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
