特性 Features

The ICL88xx family of single stage flyback controllers for constant voltage output offers power factor correction

(PFC) and low total harmonic distortion (THD) from low to full load conditions.

General features ICL8800, ICL8810, ICL8820

? Constant voltage (CV) output flyback topology

? Optimized for high power factor (HPF) flyback topology with secondary side regulation (SSR) operation,

primary side regulation (PSR) possible

? Supports universal input voltage (90 VAC to 300 VAC, 45 Hz to 66 Hz) and DC input voltage operation

? High power factor and low THD, across wide AC input voltage and output load range

? Quasi-resonant mode (QRM) operation with continuous conduction mode (CCM)-prevention and valley

switching discontinuous conduction mode (DCM) in mid to light load

? Adjustable on-time mapping at valley changing position, for the desired maximum operating switching

frequency

? Adjustable maximum on-time – limits input power and current allowing safe-operation under low line

condition

? Comprehensive set of protections:

- internal overtemperature protection (OTP)

- flyback output overvoltage protection (OVP)

- primary side overcurrent protection (OCP)

- brownin protection

- brownout protection

- VCC overvoltage protection

- open loop protection

- input overvoltage protection

? Soft start to reduce component stress during turn-on

? External start-up circuit control signal

? Reduced gate driver voltage during start-up sequence, to allow smaller VCC capacitance for faster start-up

Additional features ICL8810, ICL8820

? Burst mode for very light loads and low system standby power consumption

? VCC wake-up burst operation, to maintain sufficient VVCC in burst mode

? Reduced gate driver voltage in burst mode, to reduce gate charge loss, for lower standby power

Additional features ICL8820

? Jitter function for DC input, to ease electromagnetic interference (EMI) test compliance for emergency

lighting