PDF《APPLICATION NOTE》

Philips Semiconductors TP97036.

2/W97 APPLICATION NOTE A

45 Watt Adapter Power Supply AN01033 Version 1.0 A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors

2 The present application note describes a typical notebook adapter power supply, based on a GreenchipIITM controller, the TEA1533. The features of this controller are elaborated in full detail and a possible design strategy is given to obtain the basic component values. The performance of the final application-board is tested in order to check if the specification is met. The results are presented in tabular or graphical form. Abstract A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors

3 ? Royal Philips Electronics N.V.

2001 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors

4 APPLICATION NOTE A

45 Watt Adapter Power Supply AN01033 Author(s): C.J.A. Schetters A.C.I. van Zoest Philips Semiconductors, BU DMI PL Integrated Power Building M C 3.039, Gerstweg

2 6537 AR Nijmegen, The Netherlands E C mail: kees.schetters@philips.com arjan.van.zoest@philips.com Keywords TEA1533/TEA1507 GreenChipTMII flyback converter quasi-resonant low power standby valley switching high efficiency switched mode power supply adapter Date: 03-08-01 Number of pages:

38 A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors

5 TABLE OF CONTENTS 1. INTRODUCTION.7 1.1 A typical adapter Power Supply.7 1.2 The GreenChipTM II Family

7 2. FUNCTIONAL DESCRIPTION OF THE TEA1533.10 2.1 Start-up sequence

10 2.2 Multi mode operation.11 2.3 Safe-Restart mode.13 2.4 Protections.13 2.4.1 Demagnetization sense.13 2.4.2 Over Voltage Protection.15 2.4.3 Over Current and Over Power Protection

15 2.4.4 Short Winding Protection.16 2.4.5 LEB and maximum on-time

17 2.4.6 Over Temperature protection

17 2.4.7 Mains dependent operation enabling level.17 2.5 Pin description.17 3. DESIGN OF A

45 WATT ADAPTER POWER SUPPLY.19 3.1 Design Parameters.19 3.2 Input Circuitry.19 3.2.1 Input Capacitor.19 3.3 Flyback Transformer.20 3.3.1 General design consideration

20 3.3.2 Transformer Design, first Approximation.20 3.3.3 The Resonance Capacitor, DS C

22 3.3.4 Transformer Design, final Calculation.22 3.4 The current sense resistor.24 3.5 The primary MOSFet

24 3.6 The secondary diode

25 3.7 Secondary Capacitor

26 3.8 Protections.26 3.9 Drive circuitry.28 4. MEASUREMENTS.29 4.1 Output Voltage.29 4.1.1 Start-up time.29 4.1.2 Line regulation

29 4.1.3 Output ripple

30 4.1.4 Step response.30 4.2 Electrical component stress.31 4.2.1 Primary MOSFet.31 4.2.2 Secondary Capacitors.31 4.3 Protections.32 4.3.1 Over power protection.32 4.3.2 Open Loop Protection (Over Voltage Protection)33 4.4 Efficiency and power consumption.33 4.4.1 Efficiency.33 4.4.2 Standby Power

33 A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors

6 4.5 Gain C Phase control loop

34 4.6 EMC.34 4.7 Temperature stress

35 A

45 Watt Adapter Power Supply Application Note AN01033 Philips Semiconductors