TEA1761T_2
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 25 April 2007
3 of 13
NXP Semiconductors
TEA1761T
GreenChip synchronous rectier controller
6. Pinning information
6.1 Pinning
6.2 Pin description
7. Functional description
The TEA1761T is the controller for synchronous rectication to be used in discontinuous
conduction mode and quasi resonant yback converters. Besides controlling the
SR MOSFET, the TEA1761T contains the voltage reference and ampliers to regulate and
control the output voltage and current of the power supply.
7.1 Start-up and undervoltage lock out
The IC leaves the under-voltage lock-out state and activates the synchronous rectier
circuitry and also the voltage/current sense circuitry as soon as the voltage on the V
CC
pin
is above 8.6 V (typical). As soon as the voltage drops below 8.1 V (typical), the
under-voltage lock-out state is re-entered and the SR driver output is actively kept low and
also the opto driver output is disabled.
7.2 Synchronous rectication
After a negative voltage (310 mV typical) is sensed on the SRSENSE pin, the driver
output voltage is made 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
Fig 2. Pin conguration for TEA1761T
TEA1761T
SRSENSE
V
CC
GND
ISENSE
n.c.
VSENSE
DRIVER
OPTO
001aae772
1
2
3
4
6
5
8
7
Table 2.
Pin description
Symbol
Pin
Description
SRSENSE
1
synchronous timing input
GND
2
ground
n.c.
3
not connected
DRIVER
4
driver output for SR MOSFET
OPTO
5
opto coupler driver output
VSENSE
6
sense input for voltage control
ISENSE
7
sense input for current control
V
CC
8
supply voltage
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