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TEA1791T Fiches technique(PDF) 3 Page - NXP Semiconductors

No de pièce TEA1791T
Description  GreenChip synchronous rectifier controller
Download  11 Pages
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Fabricant  NXP [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo NXP - NXP Semiconductors

TEA1791T Fiches technique(HTML) 3 Page - NXP Semiconductors

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TEA1791T_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 3 February 2009
3 of 11
NXP Semiconductors
TEA1791T
GreenChip synchronous rectifier controller
7.
Functional description
7.1 Introduction
The TEA1791T is the controller for synchronous rectification to be 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 as soon as the voltage on the VCC pin is above 8.5 V (typ). As soon as the voltage
drops below 8.0 V (typ), the undervoltage lockout state is reentered and the SR driver
output is actively kept low.
7.3 Synchronous rectification
After a negative voltage (
−310 mV typ) is sensed on the SRSENSE pin, the driver output
voltage is driven HIGH and the external MOSFET is switched on. As soon as the
SRSENSE voltage rises to
−55 mV the driver output voltage is regulated to maintain the
−55 mV on the SRSENSE pin. As soon as the SRSENSE voltage is above −12 mV, the
driver output is pulled to ground.
After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked for
2
µs (typ). This eliminates false switch-off due to high frequency ringing at the start of the
secondary stroke.
Because the driver output voltage is reduced as soon as the voltage on the SRSENSE pin
is
−55 mV, the external power switch can be switched off quickly when the current through
the switch reaches zero. With this zero current switch-off, no separate standby mode is
needed to maintain high efficiency during the no-load operation. The zero current is
detected by sensing a
−12 mV level on the SRSENSE pin (see Figure 3).


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