TEA1762T

GreenChip synchronous rectifier controller


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.

Features and benefits

  • Combined synchronous rectification and primary feedback control functionality
  • Wide supply voltage range (8.6 V to 38 V)
  • High level of integration, resulting in a very low external component count
  • Wide opto coupler output voltage range (3.5 V to 38 V)
  • Accurate internal voltage reference for voltage control (within 1 %)
  • Separate sense ground for accurate voltage sensing
  • High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
  • Reference voltage output pin
  • Low current consumption
  • High system efficiency from no load to full load
  • Undervoltage protection
  • General purpose protection input pin
  • Internal over-temperature protection

Applications

  • Intended for adapters and other discontinuous conduction mode systems
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Show functional diagram

Block diagram: TEA1762T
Block diagram: TEA1762T

Parametrics of this product

SymbolParameterConditionsMinTyp/NomMaxUnit
Isinksink currentVCC = 15 V; voltage on pin DRIVER = 9.5 V2.22.7A
Isourcesource currentVCC = 15 V; voltage on pin DRIVER = 2 V-0.3-0.25-0.2A
tact(sr)(min)minimum synchronous rectification activation timeShort time1.522.5µs
td(act)(drv)driver activation delay time125ns
Tjjunction temperature-20150°C
V_deact(drv)driver deactivation voltage-12mV
V_reg(drv)driver regulation voltage-65-55-45mV
Vact(drv)driver activation voltage-340-310-280mV
VCCsupply voltagecontinuous-0.438V

Pinning information

PinSymbolDescriptionSimplified outlineGraphic symbol
1SRSENSEsynchronous timing inputPin configuration TEA1762TSOT108-1
2POWERGNDpower ground
3SENSEGNDsense ground
4PROTECTgeneral purpose protection input
5n.c.not connected
6DRIVERdriver output for SR MOSFET
7OPTOPROTopto coupler driver output for current protection
8OPTOREGopto coupler driver output for voltage regulation
9VREFreference voltage output
10VSENSEsense input for voltage control
11ISENSEsense input for current control
12n.c.not connected
13n.c.not connected
14VCCsupply voltage

Documentation for this product

TypeFormatTitleDate
Data sheetpdfGreenChip synchronous rectifier controller (v.2.0)2007-04-25
LogogifGreenChip logo (v.1.0)2012-04-20
Other typepdfApplication guide: Set-top boxes (STBs) (v.1.0)2011-11-28

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