TEA1761T/N2,118 NXP Semiconductors, TEA1761T/N2,118 Datasheet - Page 8

• Manufacturer Part Number: TEA1761T/N2,118
• Description: IC CTRLR GREENCHIP SYNC 8-SOIC
• Manufacturer: NXP Semiconductors
• Series: GreenChip™r

Specifications of TEA1761T/N2,118

• Mode: Discontinuous Conduction (DCM)
• Frequency - Switching: 125kHz
• Current - Startup: 60µA
• Voltage - Supply: 8.6 V ~ 38 V
• Operating Temperature: -20°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Voltage: 10 V
• Output Current: 5 mA
• Input Voltage: 8.6 V to 38 V
• Supply Current: 1 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935284211118

NXP Semiconductors
Table 5.
T
the IC; unless otherwise specified.
[1]
11. Application information
TEA1761T_2
Product data sheet
Symbol
Opto output (pin OPTO)
I
V
Voltage sense (pin VSENSE)
V
I
g
GB
Current sense (pin ISENSE)
V
I
g
GB
Temperature protection
T
T
O(max)
I(VSENSE)
I(reg)(ISENSE)
amb
m
m
pl(max)
pl(hys)
O(min)
reg(VSENSE)
reg(ISENSE)
The V
= 25 C; V
CC
Characteristics
stop voltage is V
CC
= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
Parameter
maximum output current V
minimum output voltage
regulation voltage on pin
VSENSE
input current on pin
VSENSE
transconductance
gain bandwidth product
regulation voltage on pin
ISENSE
regulation input current
on pin ISENSE
transconductance
gain bandwidth product
maximum protection
level temperature
protection level
hysteresis temperature
A switched mode power supply with the TEA1761T consists of a primary side
discontinuous conduction mode flyback 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
The output voltage is set by resistors Rfb1 and Rfb2. The output current is controlled by
the resistor Risense. The timing for the synchronous rectifier 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 sufficient
protection.
startup
…continued
5.
V
hys
.
Conditions
I
See
V
V
R
V
V
R
OPTO
OPTO
VSENSE
VSENSE
ISENSE
ISENSE
L
L
= 1 k
= 1 k
Figure 4
Rev. 02 — 25 April 2007
= 4 mA
> 5 V
= V
to I
= V
to I
OPTO
reg(ISENSE)
OPTO
reg(VSENSE)
GreenChip synchronous rectifier controller
Min
4
-
2.475 2.5
-
1
46
-
1
140
-
100
200
TEA1761T
Typ
5
-
0
40
50
15
-
150
12
100
© NXP B.V. 2007. All rights reserved.
Max
12
3.5
2.525 V
+100
-
54
0
-
-
-
-
Unit
mA
V
nA
A/V
MHz
mV
nA
A/V
MHz
C
C
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