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Design Idea DI-33 (R) TinySwitch-II Wide Range DVD
Supply: <50 mW No-load Consumption
Application DVD Player Device TNY268P Power Output 11 W cont. 17 W pk. Input Voltage 85-265 VAC Output Voltage +3.3 V, +5.0 V, +12.0 V, -12 V
(R)
Topology Flyback
Design Highlights
No-load input power <50 mW 700 mW of output power with 1 W input Built-in frequency jitter allows low cost filter 132 kHz operation minimizes transformer size and turns, providing good cross-regulation * High efficiency - >77% minimum * Meets CISPR22B/EN55022B and FCC B with >10 dB margin * * * * *
* * *
Key Design Points
* An optional low voltage bias circuit, D9 and C10, powers U1 via R6, reducing light and zero load power consumption. This provides bias current that would otherwise be provided from the DRAIN by the internal high voltage current source. The current source is disabled when the BP pin is fed externally, an internal clamp limiting the voltage to 6.3 V. The bias supply is designed to produce 7.5 V at no-load. Resistor R6 is chosen to provide approximately 500 A into the BP pin, the maximum consumption at no-load. * Good cross-regulation on 5 V and 3.3 V outputs is achieved by minimizing secondary leakage through
C8 1 nF Y1
*
the use of foil windings and dual sense feedback via R15 and R16. To minimize potential noise coupling to the SOURCE pin during common mode surges, the Y1 capacitor C8 is connected between secondary return and the HV DC rail. Resistors R5 and R7 damp ringing to improve EMI. Optional soft-finish capacitor C7 eliminates output startup overshoot. Optional under-voltage resistor R1 provides clean startup and prevents output glitches on power down. R1 = (VUV-2.5 V)/50 A. Small loop areas in the secondary layout around D10, C12, D9, C11, D7, C15, D8 and C9 together with postfilters L2/C20, L3/C17 and L4/C18 provide low output ripple, below 50 mV p-p.
12 V, 0.4 A
8
D7 UF4003 D9 1N5822
L2 3.3 uH C15 470 F 25 V L3 3.3 uH
C20 150 F 25 V 5 V, 1.6 A
13 C11 1800 F 25 V
D10 1N5822 9
C17 470 F 10 V 3.3 V, 0.7 A L4 3.3 uH
C12 1000 F 10 V R7 100 D1 & D2 1N4007 VR1 P6KE180 C2 0.01 F 1 kV 1 11 C9 220 F 25 V D8 UF4003 C1 & C4 33 F 400 V R5 47 D5 1N4007
D
C18 470 F 10 V
RTN
C6 220 F 25 V -12 V, 0.1 A R9 200 R16 6.34 k 1% R10 3.3 k C14 0.1 F U3 TL431 R15 20 k 1%
F1
L 85-265 VAC N D3 & D4 1N4007 C3 0.047 F X2
R1 2 M (Optional)
4
14 R6 R12 D6 1N4148 3.3 k 1 1/2 W 6 C10 R8 10 F 1 k 50 V 5,7
U2
TinySwitch-II
EN BP
L1 1.4 mH 0.5 A
U1 S TNY268
C5 0.1 F 50 V
U2 PC817
C7 10 F 50 V
R13 10 k 1%
PI-3205-091302
Figure 1. TinySwitch-II DVD Player Schematic.
DI-33
www.powerint.com
September 2002
DI-33
PI-3301-091602
1200 1000 800
115 VAC 230 VAC
TRANSFORMER PARAMETERS
Core Material Bobbin Himag MZ4 EEL25.4, or equivalent, 2 Gap for AL of 344 nH/T EEL25 Vertical 14 Pins Shield: 32T, 2 x 32 AWG Primary: 64T, 2 x 32 AWG Bias: 6T, 4 x 32 AWG Shield 2: 4T, 4 x 32 AWG +12 V: 4T, 4 x 32 AWG +5 V: 1T, 14 mm Cu Foil +3.3 V: 2T, 14 mm Cu Foil -12 V: 7T, 4 x 32 AWG 3 mm margin tape on both sides of bobbin. Shield (NC-5), tape, Primary (1-4), tape, Bias (7-6), tape, Shield (NC-7), tape, 12 V (13-8), 3.3 V (11-9), 5 V (9-13), tape, -12 V (14-11), tape (NC - no connect) 1420 H 25% 500 kHz (minimum)
PIN (mW)
600 400
Winding Details
200 0 0 100 200 300 400 500 600 700 800
POUT (mW)
Figure 2. PIN vs. POUT Curve.
PI-3302-091302
80 70 60 50 40
QP AV
Winding Order (Pin Numbers)
Inductance
Quasi Peak
dBV
30 20 10 0 -10 -20 0.15 1.0 10.0 -100.0
Average
Primary Resonant Frequency (Pins 1-4, all other open)
Table 1. Transformer Construction Information.
MHz
Figure 3. Conducted EMI with Artificial Hand Connected to Output Return. 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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