TEA1761T_2
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 25 April 2007
8 of 13
NXP Semiconductors
TEA1761T
GreenChip synchronous rectier controller
[1] The V
CC
stop voltage is V
startup
V
hys
.
11. Application information
A switched mode power supply with the TEA1761T consists of a primary side
discontinuous conduction mode yback controller, a transformer, and an output stage with
a feedback circuit. In the output stage a MOSFET (Qsec) is used for low conduction
losses. The MOSFET is controlled by the TEA1761T. The output voltage and/or current is
also controlled by the TEA1761T via the opto coupler connection to the primary side. See
Figure
5.
The output voltage is set by resistors Rfb1 and Rfb2. The output current is controlled by
the resistor Risense. The timing for the synchronous rectier switch is derived from the
voltage sensed on the SRSENSE pin. The resistor in the SRSENSE connection is needed
to protect the TEA1761T from excessive voltages. The SRSENSE resistor should typically
be 1 k&. Higher values might impair correct timing, lower values may not provide sufcient
protection.
Opto output (pin OPTO)
I
O(max)
maximum output current V
OPTO
> 5 V
4
5
12
mA
V
O(min)
minimum output voltage I
OPTO
= 4 mA
-
-
3.5
V
Voltage sense (pin VSENSE)
V
reg(VSENSE)
regulation voltage on pin
VSENSE
See
Figure
4
2.475 2.5
2.525 V
I
I(VSENSE)
input current on pin
VSENSE
V
VSENSE
= V
reg(VSENSE)
100 0
+100 nA
g
m
transconductance
V
VSENSE
to I
OPTO
-
40
-
A/V
GB
gain bandwidth product R
L
= 1 k&
1
MHz
Current sense (pin ISENSE)
V
reg(ISENSE)
regulation voltage on pin
ISENSE
46
50
54
mV
I
I(reg)(ISENSE)
regulation input current
on pin ISENSE
V
ISENSE
= V
reg(ISENSE)
200 100 0
nA
g
m
transconductance
V
ISENSE
to I
OPTO
-
15
-
A/V
GB
gain bandwidth product R
L
= 1 k&
1
-
-
MHz
Temperature protection
T
pl(max)
maximum protection
level temperature
140
150
-
癈
T
pl(hys)
protection level
hysteresis temperature
-
12
-
癈
Table 5.
Characteristics &continued
T
amb
= 25 癈; V
CC
= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when owing into
the IC; unless otherwise specied.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
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