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