TEA1892ATS datasheet(4/13 Pages) PHILIPS

Part #	TEA1892ATS

Description	GreenChip synchronous rectifier controller

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Manufacturer	PHILIPS [NXP Semiconductors]

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TEA1892ATS

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Product data sheet

Rev. 1 — 10 April 2014

4 of 13

NXP Semiconductors

TEA1892ATS

GreenChip synchronous rectifier controller

7.

Functional description

7.1 Introduction

The TEA1892ATS is the controller for synchronous rectification used in discontinuous

conduction mode and quasi-resonant flyback converters.

7.2 Start-up and UnderVoltage LockOut (UVLO)

The IC leaves the undervoltage lockout state and activates the synchronous rectifier

circuitry when the voltage on the VCC pin is above 8.5 V (typical). When the voltage drops

below 8.0 V (typical), the undervoltage lockout state is entered again and the SR driver

output is actively kept low.

7.3 Synchronous rectification

After a negative voltage lower than Vact(drv) (220 mV typical) is sensed on the SRSENSE

pin, the driver output voltage is driven HIGH. Then the external MOSFET is switched on.

When the SRSENSE voltage rises to Vreg(drv) (42 mV/30 mV) the driver output voltage

is regulated to maintain the Vreg(drv) on the SRSENSE pin. When the SRSENSE voltage is

above the Vdeact(drv) level (12 mV typical), the driver output is pulled to ground.

After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked

during the tact(sr)(min) (0.8 s typical). This action eliminates false switch-off due to high

frequency ringing at the start of the secondary stroke.

When the voltage on the SRSENSE pin is Vreg(drv), the driver output voltage is reduced.

This reduction enables the external power switch to be switched off quickly when the

current through the switch reaches zero. The zero current switch-off removes the need for

a separate Standby mode to maintain high efficiency during the no-load operation. The

zero current is detected by sensing a Vdeact(drv) (12 mV typical) level on the SRSENSE

pin (see Figure 3).

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