TEA1761T/N2,118 NXP Semiconductors, TEA1761T/N2,118 Datasheet - Page 3

• 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
6. Pinning information
7. Functional description
TEA1761T_2
Product data sheet
6.1 Pinning
6.2 Pin description
7.1 Start-up and undervoltage lock out
7.2 Synchronous rectification
Table 2.
The TEA1761T is the controller for synchronous rectification to be used in discontinuous
conduction mode and quasi resonant flyback converters. Besides controlling the
SR MOSFET, the TEA1761T contains the voltage reference and amplifiers to regulate and
control the output voltage and current of the power supply.
The IC leaves the under-voltage lock-out state and activates the synchronous rectifier
circuitry and also the voltage/current sense circuitry as soon as the voltage on the V
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.
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
Symbol
SRSENSE
GND
n.c.
DRIVER
OPTO
VSENSE
ISENSE
V
55 mV on the SRSENSE pin. As soon as the SRSENSE voltage is above 12 mV, the
Fig 2. Pin configuration for TEA1761T
CC
Pin description
Pin
1
2
3
4
5
6
7
8
Rev. 02 — 25 April 2007
SRSENSE
Description
synchronous timing input
ground
not connected
driver output for SR MOSFET
opto coupler driver output
sense input for voltage control
sense input for current control
supply voltage
DRIVER
GND
n.c.
1
2
3
4
TEA1761T
GreenChip synchronous rectifier controller
001aae772
8
7
6
5
V
ISENSE
VSENSE
OPTO
CC
TEA1761T
© NXP B.V. 2007. All rights reserved.
CC
3 of 13
pin