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DI-43

更新时间: 2024-11-09 03:29:39
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT /
页数 文件大小 规格书
2页 52K
描述
30 W, Universal Input, 12 V Supply with <250 mW No-load

DI-43 数据手册

 浏览型号DI-43的Datasheet PDF文件第2页 
®
Design Idea DI-43  
TOPSwitch®-GX 30 W, Universal Input,  
12 V Supply with <250 mW No-load  
Topology  
Flyback  
Device  
Power Output  
Input Voltage  
Output Voltage  
Application  
Adapter  
30 W  
85-265 VAC  
TOP244Y  
12 V  
Design Highlights  
limiting the maximum overload power of the supply. The  
reduced current limit allows continuous conduction mode  
operation with a small transformer, reducing primary and  
secondarypeakcurrents,optimizingefficiency,andreducing  
component stress.  
• High efficiency (79% minimum)  
• Low component count  
• Excellent input no-load consumption <200 mW at 115 VAC  
and <250 mW at 230 VAC input  
• Rugged supply includes UV/OV shutdown, thermal and  
short circuit protection with auto-recovery  
• Comfortably meets EN55022B and CISPR22B conducted  
EMI standards  
• Overload power delivery at 265 VAC limited to 160% of  
rated load  
Diode D1 and VR1 form a clamp circuit that absorbs leakage  
inductance energy during normal operation, with Zener VR1  
clamping the voltage to a safe level. Capacitor C2 diverts  
someoftheleakageenergyfromVR1,reducingitstemperature  
and increasing overall efficiency. After clamping, reverse  
current flows through D1, recovering some of the clamp  
energy. R3 limits the reverse current in D1 and improves  
EMI by limiting drain voltage ringing.  
Operation  
TheTOPSwitch-GXintegratesmanyfeaturestoimplementlow  
cost, switched mode power supplies.  
Resistors R9 and R10 set the output voltage. Components  
C10 and R8 provide compensation with R6 setting DC loop  
gain. Using a TL431 error amplifier gives better regulation  
and output voltage tolerance than a Zener reference and also  
provides better no-load performance due to lower (1 mA)  
bias current.  
A single resistor (R1) implements input UV/OV protection  
usingtheLpin(UVtyp.100VDC;OVtyp.450VDC). Resistor  
R4 programs the U1 current limit to 85% of nominal, and  
resistor R2 reduces this current limit as input voltage increases,  
C7  
2.2 nF  
Y1  
C12  
R11  
470 pF 33  
100 V 1/4 W  
D3  
MBR10100  
L2  
3.3 µH  
T1  
12 V, 2.5 A  
6,7  
1
3
C2  
4.7 nF  
1 kV  
C6  
680 µF  
35 V  
C7  
680 µF  
35 V  
C8  
100 µF  
35 V  
BR1  
2 A, 600 V  
VR1  
P6KE  
200  
R3  
47 Ω  
1/2 W  
RTN  
9,10  
D2  
1N4148  
D1  
UF4005  
5
4
C3  
1 µF  
50 V  
L1  
22 mH  
R7  
15 kΩ  
R1  
2 MΩ  
1/2 W  
C1  
100 µF  
400 V  
R2  
8.2 MΩ  
U2  
ISP817C  
R9  
38.3 kΩ  
1%  
1/2 W  
CX1  
TOPSwitch-GX  
D
S
L
220 nF  
D4  
250 VAC  
R6  
CONTROL  
1N4148  
U1  
TOP244Y  
C
1 kΩ  
R8  
4.7 kΩ  
F1  
3.15 A  
C11  
10 µF  
35 V  
R5  
X
F
C10  
47 nF  
6.8 Ω  
C4  
100 nF  
L
R4  
8.25 kΩ  
1%  
C5  
47 µF  
10 V  
U3  
TL431  
85-265 VAC  
N
R10  
10 kΩ  
1%  
PI-3405-112702  
Figure 1. TOPSwitch-GX 12 V, 30 W Universal Power Supply.  
November 2002  
DI-43  
www.powerint.com  

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