IC CTLR SYNC RECTIFIER 8SOIC

TEA1791AT/N1,118

Manufacturer Part NumberTEA1791AT/N1,118
DescriptionIC CTLR SYNC RECTIFIER 8SOIC
ManufacturerNXP Semiconductors
SeriesGreenChip™
TEA1791AT/N1,118 datasheet
 


Specifications of TEA1791AT/N1,118

Package / Case*Mounting Type*
Voltage - Supply8.5 V ~ 38 VOperating Temperature-20°C ~ 150°C
ModeDiscontinuous Conduction (DCM)Input / Supply Voltage (max)38 V
Input / Supply Voltage (min)8.5 VSupply Current0.95 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleSMD/SMT
Maximum Operating Temperature+ 150 CMinimum Operating Temperature- 40 C
Output Current3 ALead Free Status / RoHS StatusLead free / RoHS Compliant
Frequency - Switching-Current - Startup-
Other names935290157118  
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TEA1791AT
GreenChip synchronous rectifier controller
Rev. 01 — 7 June 2010
1. General description
The TEA1791AT 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 TEA1791AT is a controller IC dedicated for synchronous rectification on the
secondary side of discontinuous conduction mode and quasi-resonant flyback converters.
The TEA1791AT is fabricated in a Silicon On Insulator (SOI) process.
2. Features and benefits
2.1 Distinctive features
Accurate synchronous rectification functionality
Wide supply voltage range (8.5 V to 38 V)
High level of integration, resulting in a very low external component count
High driver output voltage of 10 V to drive all MOSFET brands to the lowest R
2.2 Green features
Low current consumption
High system efficiency from no load to full load
2.3 Protection features
Undervoltage protection
3. Applications
The TEA1791AT is intended for adapters. The device can also be used in all other
discontinuous conduction mode systems and quasi-resonant flyback systems that
demand a highly efficient and cost-effective solution.
4. Ordering information
Table 1.
Ordering information
Type number
Package
Name
TEA1791AT/N1
SO8
Description
plastic small outline package; 8 leads; body width 3.9 mm
Product data sheet
DSon
Version
SOT96-1

TEA1791AT/N1,118 Summary of contents

  • Page 1

    TEA1791AT GreenChip synchronous rectifier controller Rev. 01 — 7 June 2010 1. General description The TEA1791AT is a member of the new generation of Synchronous Rectifier (SR) controller ICs for switched mode power supplies. Its high level of integration allows ...

  • Page 2

    ... NXP Semiconductors 5. Block diagram SRSENSE Fig 1. 6. Pinning information 6.1 Pinning Fig 2. 6.2 Pin description Table 2. Symbol SRSENSE GND n.c. DRIVER n.c n.c. n. TEA1791AT Product data sheet 1 control Q TIMER 0.93 μs 4 DRIVER Q 0.99 μ n.c. Block diagram SRSENSE GND n.c. DRIVER ...

  • Page 3

    ... NXP Semiconductors 7. Functional description 7.1 Introduction The TEA1791AT is the controller for synchronous rectification to be used in discontinuous conduction mode and quasi-resonant flyback converters. 7.2 Start-up and UnderVoltage LockOut (UVLO) The IC leaves the undervoltage lockout state and activates the synchronous rectifier circuitry as soon as the voltage on the V voltage drops below 8 ...

  • Page 4

    ... NXP Semiconductors V SRSENSE Secondary V Fig 3. If the secondary stroke of the flyback converter is shorter than 0.93 μs (typical), the driver output is disabled. This will guarantee stable operation for very low duty cycles. When the secondary stroke increases above 0.99 μs (typical), the driver output is again enabled. ...

  • Page 5

    ... NXP Semiconductors 8. Limiting values Table 3. In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to ground (pin 2). Positive currents flow into the chip. The voltage and current ratings are valid provided the other ratings are not violated. ...

  • Page 6

    ... NXP Semiconductors 10. Characteristics Table 5. Characteristics ° all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the amb CC IC; unless otherwise specified. Symbol Parameter Supply voltage management (pin V V start-up voltage startup V hysteresis voltage hys I operating supply current V ...

  • Page 7

    ... NXP Semiconductors 11. Application information A switched mode power supply with the TEA1791AT consists of a primary side discontinuous conduction mode flyback controller, a transformer, and an output stage with a feedback circuit. A MOSFET (Q stage. This MOSFET is controlled by the TEA1791AT. The timing for the synchronous rectifier switch is derived from the voltage sensed on the SRSENSE pin ...

  • Page 8

    ... NXP Semiconductors V Fig 6. TEA1791AT Product data sheet in Q prim1 PRIMARY Tr SIDE C HB CONTROLLER Q prim2 R SRSENSE1 Q sec1 Application diagram resonant application All information provided in this document is subject to legal disclaimers. Rev. 01 — 7 June 2010 TEA1791AT GreenChip synchronous rectifier controller VCC SRSENSE SRSENSE R SRSENSE2 ...

  • Page 9

    ... NXP Semiconductors 12. Package outline SO8: plastic small outline package; 8 leads; body width 3 pin 1 index 1 DIMENSIONS (inch dimensions are derived from the original mm dimensions) A UNIT max. 0.25 1.45 mm 1.75 0.25 0.10 1.25 0.010 0.057 inches 0.069 0.01 0.004 0.049 Notes 1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. ...

  • Page 10

    ... NXP Semiconductors 13. Revision history Table 6. Revision history Document ID Release date TEA1791AT v.1 20100607 TEA1791AT Product data sheet GreenChip synchronous rectifier controller Data sheet status Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 01 — 7 June 2010 TEA1791AT Change notice ...

  • Page 11

    ... In no event shall NXP Semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or ...

  • Page 12

    ... For sales office addresses, please send an email to: TEA1791AT Product data sheet own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors’ ...

  • Page 13

    ... NXP Semiconductors 16. Contents 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 2.1 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1 2.2 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.3 Protection features . . . . . . . . . . . . . . . . . . . . . . 1 3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 Ordering information . . . . . . . . . . . . . . . . . . . . . 1 5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6 Pinning information . . . . . . . . . . . . . . . . . . . . . . 2 6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 2 7 Functional description . . . . . . . . . . . . . . . . . . . 3 7.1 Introduction 7.2 Start-up and UnderVoltage LockOut (UVLO ...