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DI-85

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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描述
2 W Charger: Replaces Unregulated Linear Solutions

DI-85 数据手册

 浏览型号DI-85的Datasheet PDF文件第2页 
Design Idea DI-85  
®
LinkSwitch-LP 2 W Charger:  
Replaces Unregulated Linear Solutions  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Charger  
LNK564P  
2 W  
90-265 VAC  
6 V  
Flyback  
Design Highlights  
Past the peak power point, cycle skipping ceases and U1  
limits the supplyʼs output current by reducing its oscillator  
(MOSFET switching) frequency, as the voltage on the FB pin  
drops. If the load demand causes the FB pin voltage to drop  
below an auto-restart threshold voltageVFB(AR) of 0.8V(1Vto  
1.5 V on the supply output) for more than 100 ms, the IC goes  
into auto-restart mode. In auto-restart, MOSFET switching is  
enabled for about 100 ms, approximately every 800 ms, until  
the FB pin voltage increases above 0.8 V.  
• Low-cost, low parts-count solution: 14-17 components  
• Proprietary IC design and winding techniques enable a  
Clampless™ design with simple Filterfuse™ input stage  
±5% over-temperature threshold – with hysteretic  
recovery – keeps PCB temperatures below safety limits  
• Auto-restart: output short circuit and open loop  
protection  
• IC creepage distance >3.2 mm: no arcing in high  
humidity  
Due to the frequency jittering of the U1 internal oscillator and  
the E-Shield™ winding techniques used in constructing the  
transformer (T1), conducted EMI is adequately attenuated by  
the LC filter formed by L1 and C1. Inductor L1 serves as both  
adifferentialmodechokeandafuse. ThisFilterfuseissleeved  
with heat-shrink tubing, and its winding wire diameter was  
selected so that it will open like a fuse if any single component  
fails shorted. Thanks to the tight current limit tolerance of  
the LinkSwitch-LP family and construction techniques used  
on T1, the primary winding can be left Clampless, since the  
peakdrainvoltagedoesnotapproachthe700Vdrain-to-source  
breakdown voltage (BVDSS) of U1.  
• Easily meets all EPS energy efficiency standards  
• Meets CISPR-22 Class B EMI with good margin  
Operation  
This LinkSwitch-LP based flyback converter (Figure 1)  
provides an output VI curve (Figure 2) similar to that of an  
unregulatedline frequencytransformer basedsupply, but with  
output current that is limited past the maximum rated output  
power (peak power point).  
From no-load to the 2 W peak power point, the LNK564P  
(U1) regulates the output voltage by skipping switching  
cycles, based on the current delivered into the FEEDBACK  
(FB) pin. At the peak power point, the supply delivers  
>300 mA of load current at >5.7 VDC.  
With no optocoupler and such a low parts count, this supply  
is cost competitive with the unregulated line frequency  
transformer based solution it was designed to replace.  
C5  
220 µF  
25 V  
VR1*  
D1  
L1  
D4  
UF4002  
RF1*  
R3 1N5240B  
T1  
EE16  
6 V,  
1N4937  
3300 µH  
8.2 Ω  
2 kΩ  
10 V  
L
0.33 A  
2
1
7
6
J-1  
J3-2  
J3-1  
RTN  
2.5 W  
C1  
10 µF  
400 V  
90-265  
VAC  
J-2  
4
N
D2  
1N4005  
5
R1  
37.4 kΩ  
D3  
1N4005  
C4*  
D
S
100 pF  
C3  
330 nF  
50 V  
FB  
BP  
250 VAC  
LinkSwitch-LP  
U1  
R2  
3 kΩ  
LNK564P  
C2  
0.1 µF  
*Optional components  
50 V  
PI-4106-101105  
Figure 1. LNK564 Based 6 V, 330 mA, 2 W, Low-Cost, Flyback Charger Power Supply.  
February 2006  
DI-85  
www.powerint.com  

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