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DI-89 PDF预览

DI-89

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 470K
描述
Low Cost 2 W CV Power Adapter

DI-89 数据手册

 浏览型号DI-89的Datasheet PDF文件第2页 
Design Idea DI-89  
LinkSwitch®-XT Low Cost 2 W  
CV Power Adapter  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Adapter  
LNK362P  
2 W  
85-265 VAC  
6.2 V  
Flyback  
the ringing of the filter. Switching frequency jitter and  
PIʼs E-Shield transformer construction technology enable  
this design to meet EN55022 Class-B conducted EMI with  
good margin (see Figure 4). Y capacitor C4 (optional) can  
improve the unit-to-unit repeatability of EMI scans.  
Design Highlights  
Low-cost, low parts-count CV solution: 20 components  
Proprietary IC design and winding techniques enable a  
Clampless™ drain-node  
± 5% over-temperature threshold – with hysteretic  
recovery – keeps PCB temperatures below safety limits  
Auto-restart: output short circuit and open loop protection  
IC creepage > 3.2 mm: no arcing in humid environments  
Easily meets all EPS energy efficiency standards  
Meets CISPR-22 Class B EMI with sufficient margin  
ThissupplyalsotakesadvantageofPsClamplesstransformer  
techniques, which uses T1ʼs primary winding capacitance to  
clamp the voltage spike that its leakage inductance causes,  
each time the MOSFET in U1 turns off. Therefore, this  
converter has no primary clamp components connected to  
the drain-node.  
Operation  
Fromno-loaduntilmaximumoutputpower(2W)isdelivered,  
the LNK362P (U1) regulates the output voltage by skipping  
switching cycles, based on the current delivered into the  
feedback(FB)pin. Iftheoutputisoverloadedandnofeedback  
(<49µA)isreceivedwithina40msperiod,U1goesintoauto-  
restart mode. In auto-restart, MOSFET switching is enabled  
for about 40 ms approximately every 800 ms if no feedback  
is received within the 40 ms window of enabled switching.  
ThisLinkSwitch-XTbasedybackconverter(Figure1)provides  
2 W of tightly regulated constant voltage (CV) output power,  
while meeting the active-mode efficiency and no-load power  
consumption requirements of all harmonized energy efficiency  
(EPA, CEC) standards (see Figure 2 and Figure 3).  
DiodesD1D4rectifytheACinput. TheresultingDCisltered  
by bulk storage capacitors C1 and C2. Components L1, L2, C1  
and C2 form a conducted EMI noise filter. Resistor R1 dampens  
C4*  
100 pF  
250 VAC  
C5  
L1  
6.2 V,  
330 µF  
T1  
1 mH  
322 mA  
16 V  
EE16  
4
5
9
8
J3-1  
J3-2  
D5  
1N4934  
3
NC NC  
RF1  
8.2 k  
2.5 W  
VR1  
D1  
D2  
R1  
3.9 k  
1/8 W  
BZX79-  
B5V1  
1N4005 1N4005  
J1  
5.1 V, 2%  
R3  
390 Ω  
1/8 W  
C1  
3.3 µF  
400 V  
C2  
3.3 µF  
400 V  
85-265  
VRMS  
R2  
1 k  
1/8 W  
U2  
PC817A  
J2  
D
S
FB  
BP  
LinkSwitch-XT  
U1  
LNK362P  
*Optional component  
D3  
D4  
C3  
100 nF  
50 V  
1N4005 1N4005  
L2  
1 mH  
PI-4205-110805  
Figure 1. LNK362 Based 6.2 V, 322 mA, 2 W, Low-cost, Flyback CV Output Power Adapter.  
November 2005  
DI-89  
www.powerint.com  

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