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PDF TEA1762T Data sheet ( Hoja de datos )
| Número de pieza | TEA1762T | |
| Descripción | GreenChip synchronous rectifier controller | |
| Fabricantes | NXP Semiconductors | |
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TEA1762T
GreenChip synchronous rectifier controller
Rev. 02 — 25 April 2007
Product data sheet
www.datasheet4u.com
1. General description
The TEA1762T 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 TEA1762T 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 TEA1762T 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 output voltage range (3.5 V to 38 V)
I Accurate internal voltage reference for voltage control (within 1 %)
I Separate sense ground for accurate voltage sensing
I High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
I Reference voltage output pin
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
I General purpose protection input pin
1 page  
NXP Semiconductors
TEA1762T
GreenChip synchronous rectifier controller
www.datasheet4u.com
7.3 SMPS output voltage and current regulation
The output voltage of the flyback Switched Mode Power Supply (SMPS) can be controlled
by sensing the output voltage via the VSENSE pin. The feedback loop via the primary
controller can regulate the output voltage of the switched mode power supply by
regulating the voltage on the VSENSE pin to 2.5 V above the voltage on pin SENSEGND.
Also the output current of the flyback SMPS can be controlled or limited. The voltage on
the ISENSE pin is regulated or limited to 50 mV above the voltage on pin POWERGND.
7.4 Opto outputs
The opto output is intended to drive an opto coupler (see Figure 5). The opto outputs have
an open drain output configuration. The maximum sink current is internally limited to 5 mA
(typical). The outputs are linearly controlled via the VSENSE and ISENSE input pins. An
over-temperature situation will switch the protection opto output (OPTOPROT) to its
maximum sink current.
During start-up (VCC < Vstartup) and undervoltage lock-out the outputs are disabled.
7.5 Protection input
The PROTECT pin is a general purpose input pin which can be used for additional
protection of the switched mode power supply. With a Negative Temperature Coefficient
(NTC) thermistor external temperature protection can be provided, e.g. the external power
switches and transformer can be protected against high temperatures. With a Zener diode
a secondary overvoltage protection can be made.
7.6 Reference voltage output
The reference voltage output pin can be used for supplying external circuitry. The
maximum output current must be limited to 1 mA.
The reference voltage is activated as soon as the start-up voltage is reached on the VCC
pin and switched off again after the VCC pin voltage drops below the VCC stop level.
7.7 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 %.
7.8 OverTemperature Protection (OTP)
The IC provides an accurate internal overtemperature protection of 150 °C (typical). The
IC will maximize the current of pin OPTOPROT 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.
TEA1762T_2
Product data sheet
Rev. 02 — 25 April 2007
© NXP B.V. 2007. All rights reserved.
5 of 15
5 Page 
NXP Semiconductors
TEA1762T
GreenChip synchronous rectifier controller
12. Test information
www.datasheet4u.com
12.1 Quality information
The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable.
TEA1762T_2
Product data sheet
Rev. 02 — 25 April 2007
© NXP B.V. 2007. All rights reserved.
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