© Semiconductor Components Industries, LLC, 2016

1

Publication Order Number:

April 2017 - Rev. P0

FL7740

FL7740

Constant-Voltage Primary-Side-

Regulation PWM Controller for

Power Factor Correction

The FL7740 provides accurate CV regulation in the steady state with

differentiated dynamic function to minimize overshoot and undershoot of

output voltage in line and load transient condition. Standby power is less

than 0.3 W for smart lighting application and power factor is higher than

0.9 even at half load condition when enabling PF optimizer for wide

output power scalability.

Startup time is less than 0.2 sec with built-in high voltage startup circuit

and output voltage quickly reaches to the target CV level by loop gain

transition technique during startup.

Various protections such as over load, output diode short, sensing resistor

short, output short and output over voltage protection guarantee high

system reliability.

Features





Precise CV regulation in the steady state : < ± 3 %



CV regulation in the load transient : < ±10 %



Overshoot-less fast HV start up time ( < 0.2 sec )



Low standby power



PF higher than 0.9 at high-line and half load by PF optimizer



Pulse-by-pulse current limit



Output short protection



Output over voltage protection



Output diode short protection



Sensing resistor short & open protection



Over load protection

Typical Applications



LED Lighting System



AC-DC Adapters, TVs, Monitors



Off Line Appliances Requiring Power Factor Correction

www.onsemi.com

SO 10L

NB

MARKING DIAGRAM

ZXYKK

Z

= Plant code

M = 1 digit year code

Y

= 1 digit week code

KK = 2 digit lot traceability code

M = Package code

A

= Product version

FL7740

MA

PIN CONNECTIONS

VDD

GND

GATE

CS

VS

HV

NC

COMV

BIAS

PF

ORDERING INFORMATION

See detailed ordering and shipping information in the

package dimensions section on page 13 of this data sheet.