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DI-75

更新时间: 2022-04-23 23:00:11
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 352K
描述
Low Cost 2.5 W Regulated Charger/Adapter

DI-75 数据手册

 浏览型号DI-75的Datasheet PDF文件第2页 
Design Idea DI-75  
®
LinkSwitch Low Cost 2.5 W  
Regulated Charger/Adapter  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Charger/Adaper  
LNK520  
2.5 W  
85-265 VAC  
5.0 V  
Flyback  
Design Highlights  
maintaining the output voltage across C7. The RCD network  
of C3, D5, R1 and R2 clamps the flyback voltage across the  
primary winding, as the U1-MOSFET turns OFF.  
Replaces a linear transformer based power supply at the  
same or lower cost, with better output regulation  
No-loadinputpowerconsumption<300mWat230VAC  
input: meets worldwide energy efficiency guidelines  
Extremely simple circuit – requires only 26 components!  
Output voltage (CV) tolerance: ±5% at peak power  
point  
The bias/feedback winding provides U1 with CONTROL pin  
current. In CV mode, that current is controlled by the U2-  
phototransistor. At start-up and in CC mode, when U2 is OFF,  
R5 provides the feedback path. Diode D6 is in the return leg of  
thewinding,makingitshieldthecorefromtheprimarywinding.  
The bias winding and the primary-to-secondary shield winding  
both reduce EMI.  
Output current (CC) tolerance: ±25% when L ≤ ±10%  
Features short-circuit, open loop and thermal protection  
Greater than 70% efficient!  
Meets EN550022 B EMI without a Y-1 Safety capacitor  
Ultra-low leakage current: < 5 µA at 265 VAC input  
CONTROL pin capacitor C6 stores energy and supplies it to  
U1 at start-up, determines the “restart attempt rate” in the auto-  
restart mode, shunts high frequency switching noise around U1  
and provides U1 with the instantaneous MOSFET gate-drive  
current it requires. The combined voltages of VR1, R7 and the  
U2-LED determine the output voltage. Resistor R8 provides  
bias current to VR1. The output voltage can be fine-tuned by  
adjusting the values of R7 and R8.  
Operation  
Fusible resistor RF1 gives short-circuit fault protection and  
limits start-up inrush current. Inductors L1 and L2 and  
capacitorsC1andC2formalow-costpi(π)lterthatattenuates  
conducted EMI. Transformer (T1) winding phasing and D7  
orientation let no secondary winding current flow when the  
U1-MOSFETisON, sotheprimarywindingcurrentstoresits  
energy in the core of T1. When the U1-MOSFET turns OFF,  
the energy stored in T1 drives current out of the secondary  
winding, forward biasing D7, charging C7 and developing/  
LinkSwitch solutions must only operate in discontinuous  
2
~
conduction mode. PO ~ 0.5 L I f, where PO = Output Power,  
L = transformer primary inductance, I = LinkSwitch  
peak current, f = Switching frequency. I2f is accurately  
controlled for LinkSwitch; therefore PO is proportional to L.  
C3  
470 pF  
500 V  
C7  
T1 EE13  
Lp = 2.40 mH  
7
D7  
11DQ06  
L1  
1.0 mH  
D1-D4  
1N4005 x 4  
330 µF  
5.0 V, 0.5 A  
RTN  
16 V  
12T  
26 AWG TIW  
R2  
150 kΩ  
3
3
8
1
114T  
35 AWG  
4
R1  
100 Ω  
2
L
D5  
1N4007G  
C2  
4.7 µF  
400 V  
C1  
4.7 µF  
400 V  
85 - 265  
VAC  
PC817A  
PC817A  
N
RF1  
8.2 Ω  
1 W  
R4  
R5  
15 Ω  
7.5 kΩ  
C5  
1 µF  
50 V  
U2  
D
S
R8  
910 Ω  
U2  
Fusible  
C
LinkSwitch  
R7  
120 Ω  
L2  
Ferrite  
Bead  
U1  
VR1  
4.7 V  
2%  
C6  
220 nF  
D6  
1N4005G  
LNK520  
PI-3869-051204  
Figure 1. 2.5 W LinkSwitch Based Charger/Adapter.  
May 2004  
DI-75  
www.powerint.com  

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