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Design Idea DI-13 (R) TinySwitch-II
3 W Universal Adapter
Application 3 W Adapter Device TNY264 Power Output 3W Input Voltage 85-265 VAC Output Voltage 9V Topology Flyback
(R)
Design Highlights
* No-load consumption less than 250 mW at 230 VAC * Compact design: 2.0" x 1.2" x 0.75" * Minimum parts count and single sided PC board ensures cost-effective solution * High frequency operation allows compact EF12.6 transformer * Enhanced ON/OFF control allows simple Zener reference and eliminates the need for loop compensation * Built-in circuitry practically eliminates audible noise with standard varnished transformer * No-load regulation achieved without pre-load resistor * Well defined frequency jitter feature reduces EMI-simple input filter meets CISPR22 Class B/EN55022B * Self-protecting hysteretic thermal shutdown: power supply automatically recovers when fault is removed
This 3 W single output, universal input power supply is available as a Design Accelerator Kit (DAK-14) including samples and documentation. With 71% minimum efficiency at full load, compliance to CISPR22 Class B, small size, and low parts count, the DAK-14 showcases the significant advantages of TinySwitch-II in low power adapter applications.
Operation
The digital ON/OFF control scheme of TinySwitch-II allows tight regulation using a low cost secondary Zener reference and eliminates the need for loop compensation. In addition, no preload is required to maintain regulation at light load, helping to reduce measured no-load consumption to <250 mW at 265 VAC - see Figure 3. TinySwitch-II also provides autorestart to reduce output overload current during fault conditions.
C5 2200 pF Y1 2 10T x2 1 8 10T 28 AWG 5 D6 11DQ06 C6 330 F 16 V L2 Bead C9 220 F 25 V 9 V, 330 mA
D1 & D3 1N4007
C3 2.2 nF 1 kV
R4 330 k 1/2 W
96T 33 AWG 3
RTN
RF1 L 8.2 C1 & C2 4.7 F 400 V D5 1N4937 VR2 BZX79-B8V2
85-265 VAC N D1 & D4 1N4007
D
R2 4.7 k 1/8 W
EN/UV BP
U1 TNY264P
S
U2 LTV817A C4 0.1 F
TinySwitch-II
L1 1 mH
Figure 1. TinySwitch-II 3 W Universal Adapter.
PI-3074-091402
DI-13
www.powerint.com
September 2002
DI-13
PI-3075-080902
Key Design Points
* Design transformer for low leakage inductance. * Varnish transformer to practically eliminate acoustic noise - gluing not required. * Maximum flux density of main transformer should be no more than 3000 gauss. * Use primary RCD clamp that allows no more than 600 V across the TinySwitch-II DRAIN and SOURCE pins. * Provide adequate copper area on PCB at the connection to the TinySwitch-II SOURCE pin, for heatsinking. Transformer Parameters
Core Material Bobbin Winding Order Primary Inductance Primary Resonant Leakage Inductance (all secondary windings shorted) Core: EF 12.6, gapped for AL of 135 nH/T2 Bobbin: Hical EF 12.6, 8 pin
Power Consumption (mW)
78%
76%
Efficiency (%)
74%
72%
70%
68% 85 135 185 235 285
Input Voltage (VAC)
Figure 2. Efficiency vs. Input Voltage.
PI-3374-091402
250
Primary (3-1) Shield winding (1-2) Secondary (8-5) 1.25 mH 700 kHz (min) 50 H
200
150
100
Table 1. Transformer Construction Information.
50
0 75 95 115 135 155 175 195 215 235 255 275
Input Voltage (VAC)
Figure 3. Efficiency vs. Input Voltage. For the latest updates, visit our Web site: www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. The products and applications illustrated herein may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com. The PI Logo, TOPSwitch, TinySwitch and EcoSmart are registered trademarks of Power Integrations, Inc. PI Expert is a trademark of Power Integrations, Inc. (c)Copyright 2002, Power Integrations, Inc.
WORLD HEADQUARTERS AMERICAS Power Integrations, Inc. San Jose, CA 95138 USA Customer Service: Phone: +1 408-414-9665 Fax: +1 408-414-9765 e-mail: usasales@powerint.com CHINA Power Integrations International Holdings, Inc. China Phone: +86-755-8367-5143 Fax: +86-755-8377-9610 e-mail: chinasales@powerint.com EUROPE & AFRICA Power Integrations (Europe) Ltd. United Kingdom Phone: +44-1344-462-300 Fax: +44-1344-311-732 e-mail: eurosales@powerint.com KOREA Power Integrations International Holdings, Inc. Seoul, Korea Phone: +82-2-782-2840 Fax: +82-2-782-4427 e-mail: koreasales@powerint.com SINGAPORE Power Integrations, Singapore Republic of Singapore 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.com JAPAN Power Integrations, K.K. Keihin-Tatemono 1st Bldg. Japan Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com APPLICATIONS HOTLINE World Wide +1-408-414-9660 TAIWAN Power Integrations International Holdings, Inc. Taipei, Taiwan Phone: +886-2-2727-1221 Fax: +886-2-2727-1223 e-mail: taiwansales@powerint.com INDIA (Technical Support) Innovatech Bangalore, India Phone: +91-80-226-6023 Fax: +91-80-228-9727 e-mail: indiasales@powerint.com APPLICATIONS FAX World Wide +1-408-414-9760
A 9/02
www.powerint.com

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