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DI-76

更新时间: 2022-04-23 23:00:11
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帕沃英蒂格盛 - POWERINT /
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2页 286K
描述
3.1 W Low Parts Count Power Supply

DI-76 数据手册

 浏览型号DI-76的Datasheet PDF文件第2页 
Design Idea DI-76  
®
LinkSwitch  
3.1 W Low Parts Count Power Supply  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage Topology  
Appliance/Industrial Control  
LNK520P  
3.1 W  
100-375 VDC  
12 V Flyback  
Design Highlights  
restart(forhardshortcircuits)andthermalshutdowneffectively  
produce a very rugged design.  
Replaces a linear transformer based power supply at the  
same or lower cost, but with much better performance  
High Efficiency: >75% at >100 mA of load current  
Primary side regulated: requires no optocoupler  
<300 mW no-load power consumption at 375 VDC  
Very low parts count: only 9 components!  
LinkSwitch derives all feedback information from the primary  
side, thus no optocoupler is required. During output diode  
(D4) conduction, the output voltage is reflected through the  
transformer turns ratio, providing a primary feedback voltage  
(VOR), which is rectified by diode D3 and held by capacitor C4.  
Resistor R3 limits the effects of transformer leakage on the  
feedback voltage. Resistor R2 feeds the VOR signal as a current  
to the CONTROL pin of the LinkSwitch, controlling duty cycle  
(and primary current limit during overload conditions). When  
there is little or no feedback signal (such as a short circuit) the  
LinkSwitch goes into auto-restart, limiting output current to  
approximately 40 mA.  
12 V output: ideal for driving motors, relays, or SCRs  
Operation  
The very low parts count LinkSwitch flyback circuit shown  
below can be used as a general-purpose power supply or  
linear adapter replacement.  
The design provides regulated output voltage during normal  
loads as well as a soft output-current limit during overload  
conditions(suchasastalledmotorordefectiverelay).Adding  
to this, the other LinkSwitch self-protection features of auto-  
Capacitor C3 provides device decoupling. The extra winding  
on pin 3 of T1 is a shield that reduces EMI.  
LinkSwitch  
12 V, 260 mA  
T1  
D
S
1
+
C3  
+
U1  
C
69T  
1 µF  
10 V  
LNK520  
5
34 AWG  
C5  
30T  
C4  
4
220 µF  
30 AWG  
T.I.W.  
0.1 µF  
100 V  
FILM  
R2  
17.8 kΩ  
25 V  
43T  
35 AWG  
6
*C2  
100 nF  
400 V  
DC IN  
100-375  
VDC  
3
D3  
1N4937  
RTN  
D4  
UF4003  
1 A  
55T  
38 AWG  
200 V  
R3  
150 Ω  
EE13  
Lp = 2.484 mH  
*Optional  
Component  
PI-3883-070604  
Figure 1. DC-Input, Isolated LinkSwitch 3.12 W Flyback Converter.  
July 2004  
DI-76  
www.powerint.com  

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