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DI-78

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 458K
描述
Low Cost 1.6 W CV/CC Charger/Adapter

DI-78 数据手册

 浏览型号DI-78的Datasheet PDF文件第2页 
Design Idea DI-78  
®
LinkSwitch-HF Low Cost 1.6 W  
CV/CC Charger/Adapter  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Charger/Adapter  
LNK353  
1.6 W  
85-265 VAC  
5.2 V  
Flyback  
Design Highlights  
through the use of transformer shield windings, a snubber (R4  
and C9) across the output diode, and by the internal switching  
frequency jitter of LinkSwitch-HF.  
Low cost, low component count solution  
No-loadpowerconsumption<300mWmeetsworldwide  
energy efficiency requirements  
LinkSwitch-HF uses ON/OFF control to regulate the output.  
Current >49 µA fed from the BYPASS pin capacitor C5 into  
the FEEDBACK pin disables the MOSFET for that switching  
cycle.  
Low leakage current design, <10 µA  
Universal AC input range – single design worldwide  
Secondary-side feedback gives accurate voltage and  
constant current output  
Small size and weight  
Meets EN55022 B EMI limits  
To maximize efficiency, a Schottky diode (D7) is used to rectify  
the secondary. Filtering is provided by a low ESR capacitor  
C6 and for most battery chargers, no additional filtering is  
required.  
Operation  
The AC input is rectified and filtered and applied to one  
side of the primary winding. The other end of the primary is  
connected to the DRAIN pin of U1. During the on-time of  
U1, energy is stored in the transformer and delivered to the  
load when U1 switches off. A simple RCD clamp (D5, R2,  
C3 and R3) limits the peak drain voltage.  
During CV operation the output voltage is determined by the  
sum of the Q1 VBE voltage and VR1. As the voltage increases  
above this level, Q1 is biased on and current is fed through the  
optocoupler LED, thus inhibiting switching cycles to maintain  
regulation. The transition to CC operation occurs when the  
voltage developed across R9 and R8 exceeds the LED forward  
voltage of U2 (~1V). Resistors R7 and R8 limit the optocoupler  
current during transients. Resistor R5 limits the base current of  
Q1 and R6 provides a bias current through VR1 (~0.5 mA).  
A simple pi (π) filter formed by C1, L1 and C2 together with  
RF1 are sufficient to attenuate differential conducted EMI.  
Common mode and radiated EMI generation is minimized  
C9  
680 pF  
100 V  
C10  
100 pF  
Y1  
R4  
62 Ω  
C3  
L2  
Bead  
R5  
5.1 Ω  
R6  
1.2 kΩ  
R3  
2.2 nF  
5.2 V,  
320 mA  
200 k400 V  
1
4
7
6
J3  
BR1  
MD5S  
0.5 A,  
600 V  
D7  
10BQ060  
Q1  
C1  
C7  
100 µF  
10 V  
R1  
2N3906  
2.2 µF  
400 V  
200 kΩ  
RF1  
8.2 Ω  
R2  
VR1  
J1  
NC NC  
200 Ω  
C6  
BZX79-  
B5V1  
5.1 V, 2%  
470 µF  
10 V  
T1  
EP10  
R7  
390 Ω  
D5  
85-265  
VAC  
Lp = 900 µH  
1N4007G  
C2  
2.2 µF  
400 V  
R8  
100 Ω  
1%  
J2  
D
S
FB  
BP  
U2B  
PC817D  
U2A  
PC817D  
LinkSwitch-HF  
U1  
R9  
3 Ω  
C5  
L1  
Bead  
LNK353  
0.1 µF  
1/2 W  
J4  
50 V  
RTN  
PI-3899-072204  
Figure 1. Schematic of a 1.6 W, 5.2 V Constant Voltage, 320 mA Constant Current Charger Using LNK353P.  
November 2004  
DI-78  
www.powerint.com  

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