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DI-33 PDF预览

DI-33

更新时间: 2022-04-23 23:00:11
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT DVD
页数 文件大小 规格书
2页 60K
描述
Wide Range DVD Supply: <50 mW No-load Consumption

DI-33 数据手册

 浏览型号DI-33的Datasheet PDF文件第2页 
®
Design Idea DI-33  
Tin yS w it c h®-II Wide Range DVD  
Supply: <50 mW No-load Consumption  
Topology  
Flyback  
Device  
Power Output  
Input Voltage  
Output Voltage  
Application  
DVD Player  
11 W cont. 17 W pk. 85-265 VAC  
TNY268P  
+3.3 V, +5.0 V, +12.0 V, -12 V  
the use of foil windings and dual sense feedback via R15  
and R16.  
Design Highlights  
• No-load input power <50 mW  
• 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.  
• Optionalsoft-finishcapacitorC7eliminatesoutputstartup  
overshoot.  
• Optional under-voltage resistor R1 provides clean startup  
and prevents output glitches on power down.  
R1 = (VUV-2.5 V)/50 µA.  
• Small loop areas in the secondary layout around D10,  
C12, D9, C11, D7, C15, D8 and C9 together with post-  
filters L2/C20, L3/C17 and L4/C18 provide low output  
ripple, below 50 mV p-p.  
• 700 mW of output power with 1 W input  
• Built-in frequency jitter allows low cost π filter  
• 132 kHz operation minimizes transformer size and turns,  
providing good cross-regulation  
• High efficiency – >77% minimum  
• MeetsCISPR22B/EN55022BandFCCBwith>10dBmargin  
Key Design Points  
• Anoptionallowvoltagebiascircuit,D9andC10,powersU1  
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 µA into the BP pin, the maximum  
consumption at no-load.  
12 V, 0.4 A  
8
13  
9
L2  
3.3 uH  
D7  
UF4003  
C20  
150 µF  
25 V  
C15  
470 µF  
25 V  
D9  
1N5822  
5 V, 1.6 A  
3.3 V, 0.7 A  
RTN  
L3  
3.3 uH  
• Good cross-regulation on 5 V and 3.3 V outputs is  
achieved by minimizing secondary leakage through  
C11  
C17  
1800 µF  
470 µF  
10 V  
D10  
1N5822  
25 V  
C8  
1 nF  
Y1  
L4  
3.3 uH  
C12  
C18  
470 µF  
10 V  
1000 µF  
10 V  
R7  
100 Ω  
11  
D1 & D2  
1N4007  
C2  
0.01 µF  
1 kV  
VR1  
1
4
C9  
C6  
P6KE180  
220 µF 220 µF  
25 V  
25 V  
D8 UF4003  
-12 V, 0.1 A  
F1  
R5  
47 Ω  
14  
C1 & C4  
33 µF  
R9  
R6  
R12  
L
R1  
2 MΩ  
200 Ω  
D6 1N4148  
3.3 kΩ  
1 Ω  
400 V  
C3  
0.047 µF  
X2  
1/2 W  
R16  
6.34 kΩ  
1%  
(Optional)  
6
85-265  
VAC  
C10  
10 µF  
50 V  
D5  
1N4007  
R8  
1 kΩ  
U2  
R10  
3.3 kΩ  
R15  
20 kΩ  
5,7  
Tin yS w it c h -II  
N
D
1%  
EN  
C14  
0.1 µF  
D3 & D4  
1N4007  
C7  
BP  
10 µF  
50 V  
U3  
TL431  
S
U1  
TNY268  
C5  
0.1 µF  
50 V  
L1  
R13  
U2  
PC817  
1.4 mH  
0.5 A  
10 kΩ  
1%  
PI-3205-091302  
Figure 1. TinySwitch-II DVD Player Schematic.  
September 2002  
DI-33  
www.powerint.com  

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