HFC0300

Variable Off Time Controller

HFC0300 Rev. 1.0

www.MonolithicPower.com

1

9/23/2011

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The Future of Analog IC Technology

DESCRIPTION

HFC0300 is a variable off-time controller that

uses

a

fixed-peak–current

technique

to

decrease its frequency as the load lightens. As

a result, it offers excellent efficiency at light-load

while optimizing the efficiency under other load

conditions.

When the frequency decreases to threshold,

the peak current decreases with the decreasing

load to prevent mechanical resonance in the

transformer. The controller enters burst mode

when the output power falls below a given level.

The HFC0300 features various protections such

overload protection, short-circuit protection, and

over-voltage protection.

The HFC0300 is available in SOIC-7 package.

FEATURES

 Variable Off-Time, Current Mode Control

 Universal Main Supply Operation (85VAC to

265VAC)

 Frequency Foldback as Load Lightens

 Peak-Current Compression to Reduce

Transformer Noise

 Active-Burst Mode for Low Standby Power

Consumption

 Internal High-Voltage Current Source

 Internal 200ns Leading Edge Blanking

 Thermal Shutdown (Auto Restart with

Hysteresis)

 VCC Under-Voltage Lockout with Hysteresis

 Over-Voltage Protection on VCC Pin

 Timer-Based Overload Protection

 Short-Circuit Protection

 Natural Spectrum Shaping for Improved

EMI Performance

APPLICATIONS



Battery Charger for Portable Electronics



Standby Power Supply



Switched-Mode Power Supplies

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Monolithic Power Systems, Inc.