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PDF TEA1761T Data sheet ( Hoja de datos )
| Número de pieza | TEA1761T | |
| Descripción | GreenChip synchronous rectifier controller | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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TEA1761T
GreenChip synchronous rectifier controller
Rev. 02 — 25 April 2007
www.DataSheet4U.com
Product data sheet
1. General description
The TEA1761T is a member of the new generation of Synchronous Rectifier (SR)
controller ICs for switched mode power supplies. Its high level of integration allows the
design of a cost-effective power supply with a very low number of external components.
The TEA1761T is a controller IC dedicated for synchronous rectification on the secondary
side of discontinuous conduction mode and quasi resonant flyback converters. Besides
electronics for synchronous rectification, it also has integrated circuitry for output voltage
and output current regulation.
The TEA1761T is fabricated in a Silicon On Insulator (SOI) process. This NXP SOI
process makes possible a wide range of operation.
2. Features
2.1 Distinctive features
I Combined synchronous rectification and primary feedback control functionality
I Wide supply voltage range (8.6 V to 38 V)
I High level of integration, resulting in a very low external component count
I Wide opto coupler output voltage range (3.5 V to 38 V)
I Accurate internal voltage reference for voltage control (within 1 %)
I High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
2.2 Green features
I Low current consumption
I High system efficiency from no load to full load
2.3 Protection features
I Undervoltage protection
I Internal over-temperature protection
3. Applications
The TEA1761T is intended for adapters. The device can also be used in all other
discontinuous conduction mode and quasi resonant flyback systems that demand a highly
efficient and cost-effective solution.
1 page  
NXP Semiconductors
TEA1761T
www.DataSheet4U.com
GreenChip synchronous rectifier controller
7.4 Opto output
The opto output is intended to drive an opto coupler (see Figure 5). The opto output has
an open-drain output configuration. The maximum sink current is internally limited to 5 mA
(typical). The output is linearly controlled via the VSENSE and ISENSE input pins. An
over-temperature situation will switch the opto output to its maximum sink current.
During start-up (VCC < Vstartup) and undervoltage lock-out the output is disabled.
7.5 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit. The reference voltage is trimmed to an accuracy within 1 %.
7.6 OverTemperature Protection (OTP)
The IC provides an accurate internal overtemperature protection of 150 °C (typical). The
IC will maximize the current of pin OPTO as soon as the internal temperature limit is
reached. The opto signal can be used on the primary side of the flyback controller to
activate the SMPS protection or limit the output power. As soon as the overtemperature
condition is solved, normal operation will resume.
7.7 Driver
The driver circuit to the gate of the external power MOSFET has a source capability of
typically 250 mA and a sink capability of typically 2.7 A. This permits fast turn-on and
turn-off of the power MOSFET for efficient operation. The output voltage of the driver is
limited to 10 V (typical). This high output voltage will drive all MOSFET brands to the
minimum on-state resistance.
During start-up conditions (VCC < Vstartup) and undervoltage lock-out the driver output
voltage is actively pulled low.
TEA1761T_2
Product data sheet
Rev. 02 — 25 April 2007
© NXP B.V. 2007. All rights reserved.
5 of 13
5 Page 
NXP Semiconductors
TEA1761T
www.DataSheet4U.com
GreenChip synchronous rectifier controller
14. Revision history
Table 6. Revision history
Document ID
Release date Data sheet status
Change notice
Supersedes
TEA1761T_2
Modifications:
20070425
Product data sheet
-
TEA1761T_1
• Updated limiting values for VSRSENSE in Table 3.
• Updated characteristic values for Isource and Isink in Table 5.
• Added footnote [1] to Table 5.
• Soldering section removed.
• The format of this data sheet has been redesigned to comply with the new identity guidelines
of NXP Semiconductors.
• Legal texts have been adapted to the new company name where appropriate.
TEA1761T_1
20060331
Objective data sheet
-
-
TEA1761T_2
Product data sheet
Rev. 02 — 25 April 2007
© NXP B.V. 2007. All rights reserved.
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