TEA1761T_2
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 25 April 2007
4 of 13
NXP Semiconductors
TEA1761T
GreenChip synchronous rectier controller
driver output is pulled to ground. After switch-on of the SR MOSFET, the input signal on
the SRSENSE pin is blanked for 2 祍 (typical). This will eliminate 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 fast when the current through the
switch reaches zero. With this zero-current switch off, no separate standby mode is
needed to maintain high efciency during no-load operation. The zero current is detected
by sensing a 12 mV level on the SRSENSE pin. See
Figure
3.
If the secondary stroke of the yback converter is shorter than 2 祍 (typical), the driver
output is disabled. This will guarantee stable operation for very low duty cycles. When the
secondary stroke increases above 2.2 祍 (typical) then the driver output is again enabled.
7.3 SMPS output voltage and current regulation
The output voltage of the yback Switched Mode Power Supply (SMPS) can be controlled
by sensing the output voltage via pin V
SENSE
. The feedback loop via the primary controller
can regulate the output voltage of the switched mode power supply by regulating the
voltage on pin V
SENSE
, to 2.5 V.
Also the output current of the yback SMPS can be controlled or limited. The voltage on
pin I
SENSE
is regulated or limited to 50 mV above the voltage on pin GND.
Fig 3. Synchronous rectication signals
014aaa057
0 V
12 mV
55 mV
310 mV
0 A
0 A
0 V
V
SRSENSE
V
DRIVER
Primary
current
Secondary
current
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