General description

The GreenChip II is the second generation of controller ICs intended for green flyback Switched Mode Power Supplies (SMPS). Its high level of integration allows the design of a cost effective power supply with a very low number of external components.

Features

2.1 Distinctive features

■ Universal mains supply operation (70 V to 276 V AC)

■ High level of integration resulting in a very low external component count

■ Fixed frequency Continuous Conduction Mode (CCM) operation capability

■ Quasi-Resonant (QR) Discontinuous Conduction Mode (DCM) operation capability

2.2 Green features

■ Valley or zero voltage switching for minimum switching losses in QR operation

■ Cycle skipping mode at very low loads; input power < 300 mW at no-load operation for a typical adapter application

■ On-chip start-up current source

2.3 Protection features

■ Safe restart mode for system fault conditions

■ Zero current switch-on in QR mode

■ Undervoltage protection (fold back during overload)

■ IC OverTemperature Protection (OTP) (latched)

■ Low and adjustable OverCurrent Protection (OCP) trip level

■ Soft (re)start

■ Mains voltage-dependent operation-enabling level

■ TEA1532CT: general purpose input for latched or safe restart protection and timing, e.g. to be used for OverVoltage Protection (OVP), output short-circuit protection or system OTP

■ TEA1532BT: general purpose input for latched protection and timing, e.g. to be used for OVP, output short-circuit protection or system OTP

■ Brown-out protection

3. Applications

■ Adapters and open frame flyback power supplies. The device can also be used in all applications that demand an efficient and cost-effective solution up to 250 W.