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1.2.1 Key features

? PFC and flyback controller integrated in one SO16 package

? Switching frequencies of PFC and flyback controller are independent of each other

? No external hardware required for the communication between both controllers

? High level of integration, resulting in a low external component count

? Integrated mains voltage enable and brownout protection

? Fast-latch reset function implemented

? Power-down functionality for very low Standby mode power requirements

1.2.2 System features

? Safe restart mode for system fault conditions

? High-voltage start-up current source (5 mA)

? Reduction of HV current source (1 mA) in safe restart mode

? Wide VCC range (13.4 V to 38 V)

? MOSFET driver voltage limited

? Easy control of start-up behavior and VCC circuit

? General-purpose input for latched protection

? Internal IC overtemperature protection

? Accurate PFC switch on/switch off control using flyback switching frequency

measurement

? One high-voltage spacer between the HV pin and the next active pin

? Open pin protection on the VINSENSE, VOSENSE, PFCAUX, FBCTRL, and FBAUX

pins

1.2.3 PFC features

? Dual-output voltage boost converter

? QR/DCM operation with valley switching

? Frequency limitation (139 kHz) to reduce switching losses and ElectroMagnetic

Interference (EMI)

? ton controlled

? Mains input voltage compensation for control loop for good transient response

? OverCurrent Protection (OCP)

? Soft-start and soft-stop

? Open/short-circuit detection for PFC feedback loop: no external OverVoltage Protection

(OVP) circuit necessary

? Adjustable delay for switching off the PFC

? Overriding the PFC switch on/switch off functionality

1.2.4 Flyback features

? Burst/FR/QR/DCM operation with valley switching

? Frequency Reduction (FR) with an adjustable minimum peak current and valley

switching to maintain high efficiency at low output power levels

? Burst mode enhances the overall efficiency at low-output power

? Burst mode benefits the reduction of audible noise

? Frequency limitation (130 kHz) to reduce switching losses and EMI

? Current mode controlled

? Overcurrent protection

? Soft-start

? Accurate OVP through auxiliary winding

? Time-out protection for output overloads and open feedback loop, available as safe

restart (TEA1755T) or latched (TEA1755LT) protection

? VCC undervoltage prevention during burst mode