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DI-55 PDF预览

DI-55

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 220K
描述
20 W (25 W peak) DVD Supply

DI-55 数据手册

 浏览型号DI-55的Datasheet PDF文件第2页 
Design Idea DI-55  
®
TOPSwitch-GX  
20 W (25 W peak) DVD Supply  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
DVD  
TOP245P  
20 W (25 W pk)  
85-265 VAC  
3.3 V / 5 V / 12 V / -24 V  
Flyback  
TheexternalcurrentlimitprogrammingandremoteON/OFF  
(inhibit) functions of the M pin allow current mode control  
and reduced switching frequency at light and no-load condi-  
tions. Current mode control is implemented by R2, Q3, R3,  
C16, R4 and R6.  
Design Highlights  
• Simple, low cost, low part count solution  
• No heatsinks required  
• Low EMI-frequency jitter allows EN55022B/FCC B  
compliance with simple EMI filter  
• High efficiency, >75% at 90 VAC  
• Low zero load power consumption, <100 mW at  
230 VAC  
Feedback current above ~2 mA(U1 supply current) forward  
biases Q3 and pulls up R6. This adjusts the sink current out  
of the M pin, thereby allowing the output voltage feedback  
loop to control the primary switch current.  
• Low standby power consumption, <1 W input at 0.5 W  
output, 230 VAC  
• Excellent cross-regulation  
• Differential and common mode surge immunity to 3 kV  
(EN 61000-4-5)  
Resistor R6 sets the maximum current limit, while R2 and  
C16 provide slope compensation. The value of R4 is chosen  
to ensure that current does not flow into the M pin, enabling  
the line sensing features of the pin. The current out of the  
M pin falls as the load is reduced until the M pin inhibit  
threshold is reached. The supply then operates with a fixed  
25% current limit, lowering the switching frequency to  
maintain regulation. This greatly reduces switching losses,  
maintaining high standby efficiency and low no-load power  
consumption.  
Operation  
The TOP245P selected for the design in Figure 1 is ideal for  
DVD and set-top box applications. The P package removes the  
need for a heatsink while still delivering 20 W/25 W peak at  
an ambient temperature of 50 °C.  
VR1  
P6KE  
130  
C1  
C4  
33 µF  
400 V  
C8  
L5  
BEAD  
L2  
3.3 µH  
33 µF  
400 V  
2.2 nFY1  
+12 V, 500mA  
T1  
EE25L  
F1  
3.15 A  
250 VAC  
1
8
D7  
L1  
RT1  
t°  
1N5819  
R1  
J1-2  
68 Ω  
C15  
470 µF  
25 V  
C20  
LINE  
180 µF  
OPTIONAL  
C2  
RV1  
275 VAC  
25 V  
C3  
0.047 µF  
X2  
0.01 µF  
12  
13  
C17  
470 µF  
10 V  
1 kV  
R14  
1.13 kΩ  
1%  
R16  
R7  
1 kΩ  
L3  
3.3 µH  
J1-1  
R15  
2.4 kΩ  
Q1  
1N4007 x 4  
2.0 kΩ  
5 mH  
+5 V, 2.5 A  
J2-3  
1%  
2SA0885  
4
CM Choke  
NTRL  
D11  
SB540CT  
D8  
1N4005  
C12  
Q5  
2N3906  
1200 µF  
Q4  
2N3904  
10 V  
D9  
1N4005  
L4  
3.3 µH  
D10  
SB540CT  
D5  
+3.3 V, 2 A  
J2-6  
9
1N4007GP  
C18  
470 µF  
10 V  
C12  
1200 µF  
10 V  
R17  
200 Ω  
RET  
10,11  
R13  
J2-2, 4, 5, 7  
2 kΩ  
1%  
C9  
C6  
R11  
20.0 kΩ  
1%  
R12  
150 µF  
35 V  
150 µF  
6.34 kΩ  
35 V  
1%  
R8  
D12  
UF4003  
14  
TOPSwitch-GX  
1 Ω  
U1  
1/2 W  
-24 V, 50 mA  
J2-1  
TOP245P  
D
S
C13  
47 µF  
25 V  
7
C16  
0.1 µF  
CONTROL  
C
5
LTV817A  
U2  
M
R2  
18 kΩ  
R3  
270 Ω  
C14  
0.1 µF  
R10  
10 kΩ  
Q3  
1N3906  
R4  
10 kΩ  
R6  
5.1 kΩ  
C5  
47 µF  
25 V  
D6  
1N4148  
U3  
TL431  
R9  
10.0 kΩ  
1%  
PI-3648-071106  
Figure 1. 20 W Multiple Output DVD Supply.  
July 2006  
DI-55  
www.powerint.com  

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