Datasheet

ManualsBrandsNXP SEMICONDUCTORS ManualsPMICsPMIC - power supply controllers/monitors 1 mA SO 14

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

n Combined synchronous rectiﬁcation and primary feedback control functionality

n Wide supply voltage range (8.6 V to 38 V)

n High level of integration, resulting in a very low external component count

n Wide opto output voltage range (3.5 V to 38 V)

n Accurate internal voltage reference for voltage control (within 1 %)

n Separate sense ground for accurate voltage sensing

n High driver output voltage of 10 V to drive all MOSFET brands to the lowest R

DSon

n Reference voltage output pin

2.2 Green features

n Low current consumption

n High system efﬁciency from no load to full load

2.3 Protection features

n Undervoltage protection

n Internal over-temperature protection

n General purpose protection input pin

TEA1762T

GreenChip synchronous rectiﬁer controller

Rev. 02 — 25 April 2007 Product data sheet

Summary of content (15 pages)

PAGE 1
TEA1762T GreenChip synchronous rectifier controller Rev. 02 — 25 April 2007 Product data sheet 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.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 3. Applications n The TEA1762T 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. 4. Ordering information Table 1. Ordering information Type number TEA1762T Package Name Description Version SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1 5.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 6. Pinning information 6.1 Pinning SRSENSE 1 14 VCC POWERGND 2 13 n.c. SENSEGND 3 12 n.c. PROTECT 4 n.c. 5 DRIVER 6 OPTOPROT 7 TEA1762T 11 ISENSE 10 VSENSE 9 VREF 8 OPTOREG 001aae773 Fig 2. Pin configuration TEA1762T 6.2 Pin description Table 2.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 7.1 Start-up and undervoltage lock-out 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 VCC pin 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 outputs are disabled.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 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.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 7.9 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.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller Table 3. Limiting values …continued In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to power ground (pin 2); positive currents flow into the chip. The voltage ratings are valid provided other ratings are not violated; current ratings are valid provided the maximum power rating is not violated.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 10. Characteristics Table 5. Characteristics Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to sense ground (pin 3); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit 8.35 8.6 8.85 V - 0.5 - V VCC = 8 V; VCC < Vstartup - 1 - mA under normal operation; no load on pin DRIVER - 1.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller Table 5. Characteristics …continued Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to sense ground (pin 3); currents are positive when flowing into the IC; unless otherwise specified.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 11. Application information A switched mode power supply with the TEA1762T consists of a primary side discontinuous conduction mode flyback controller, a transformer, and an output stage with a feedback circuit. In the output stage a MOSFET (Qsec) is used for low conduction losses. The MOSFET is controlled by the TEA1762T.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 12. Test information 12.1 Quality information The General Quality Specification for Integrated Circuits, SNW-FQ-611 is applicable. TEA1762T_2 Product data sheet © NXP B.V. 2007. All rights reserved. Rev.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 13. Package outline SO14: plastic small outline package; 14 leads; body width 3.9 mm SOT108-1 D E A X c y HE v M A Z 8 14 Q A2 A (A 3) A1 pin 1 index θ Lp 1 L 7 e detail X w M bp 0 2.5 5 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) mm 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 8.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 14. Revision history Table 6. Revision history Document ID Release date Data sheet status Change notice Supersedes TEA1762T_2 20070425 Product data sheet - TEA1762T_1 Modifications: TEA1762T_1 • • Updated limiting values for ISRSENSE in Table 3. • • Soldering section removed. • Legal texts have been adapted to the new company name where appropriate.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 15. Legal information 15.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
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TEA1762T NXP Semiconductors GreenChip synchronous rectifier controller 17. Contents 1 2 2.1 2.2 2.3 3 4 5 6 6.1 6.2 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 8 9 10 11 12 12.1 13 14 15 15.1 15.2 15.3 15.4 16 17 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1 Protection features . .