Fairchild FAN6754A Data Handbook

6754A ig ly In teg rated reen -M e P tro ller

April 2012

FAN6754A Highly Integrated Green- Mode PWM Controller Brownout and VLimit Adjustment by HV Pin Features Description

 High-Voltage Startup The highly integrated FAN6754A PWM controller provides several features to enhance the performance

 AC Input Brownout Protection with Hysteresis

of flyback converters. To minimize standby power  Monitor HV to Adjust VLimit consumption, a proprietary green-mode function provides off-time modulation to continuously decrease

 Low Operating Current: 1.5m A the switching frequency under light-load conditions.  Linearly Decreasing PWM Frequency to 22KHz

Under zero-load and very light-load conditions,  Frequency Hopping to Reduce EMI Emission FAN6754A saves PWM pulses by entering deep burst mode. This burst mode function enables the power

 Fixed PWM Frequency: 65KHz

supply to meet international power conservation  Peak-Current-Mode Control requirements.  Cycle-by-Cycle Current Limiting FAN6754A integrates a frequency-hopping function internally to reduce EMI emission of a power supply with

 Leading-Edge Blanking (LEB)

minimum line filters. Built-in synchronized slope  Internal Open-Loop Protection compensation is accomplished by proprietary HV monitor to adjust VLimit for constant output power limit

 GATE Output Maximum Voltage Clamp: 13V

over universal AC input range. The gate output is  VDD Under-Voltage Lockout (UVLO) clamped at 13V to protect the external MOSFET from over-voltage damage.

 VDD Over-Voltage Protection (OVP)

Other protection functions include AC input brownout

 Programmable Over-Temperature Protection (OTP)

protection with hysteresis, SENSE pin short-circuit  Internal Latch Circuit (OVP, OTP) protection, and VDD over-voltage protection. For over- temperature protection, an external NTC thermistor can

 Open-Loop Protection (OLP); Restart for MR, Latch

be applied to sense the external switcher’s temperature.

for ML

When VDD OVP or OTP are activated, an internal latch

 SENSE Short-Circuit Protection (SSCP) circuit is used to latch-off the controller. The latch mode

is reset when the VDD supply is removed.

 Built-in 8ms Soft-Start Function

FAN6754A is available in an 8-pin SOP package.

Applications

General-purpose switch-mode power supplies and Related Resources

flyback power converters, including:

 Evaluation Board: FEBFAN6754AMR_CP450v1

 Power Adapters

Ordering Information

Operating

Part Number Package Packing Method

Temperature Range

FAN6754AMRMY

-40 to +105°C 8-Pin, Small Outline Package (SOP) Tape & Reel

FAN6754AMLMY

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6754A • Rev. 1.0.3