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DI-84 PDF预览

DI-84

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
3 W Charger: <30 mW No-load Consumption

DI-84 数据手册

 浏览型号DI-84的Datasheet PDF文件第2页 
Design Idea DI-84  
®
TinySwitch-II 3 W Charger:  
<30 mW No-load Consumption  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Charger  
TNY264P  
3 W  
85-265 VAC  
5 V, 600 mA  
Flyback  
The bias winding should provide enough current to fully  
disable the internal current source at no-load. Other load  
conditions are not important, as the device will be powered  
from the DRAIN pin if bias is lost. This allows a simple  
flyback winding to be used. Figure 2 shows that the bias  
winding and choice of R2 should provide approximately  
600 µA at no-load to minimize consumption.  
Design Highlights  
• Less than 30 mW no-load power consumption (for  
115/230 VAC input)  
• Meets CISPR-22 Class B without Y capacitor  
• Low cost, low component count solution  
• Meets CEC active mode efficiency with good margin  
The circuit meets CISPR-22 Class B conducted EMI limits  
without aYcapacitor, and therefore has very lowAC leakage  
current. Superior EMI performance is achieved via the  
TinySwitch-II frequency jitter, an output RC snubber, use of  
the bias winding as a shield, and careful selection of clamp  
Zener voltage.  
Operation  
The TinySwitch-II flyback converter in Figure 1 generates  
a constant voltage, constant current (CV/CC) 5 V, 600 mA  
output. Typical applications include wall-mounted chargers  
for cell phones, PDAs and other battery powered portable  
equipment.  
Key Design Points  
The key performance characteristic of the circuit shown is  
the extremely low no-load consumption of <30 mW. A linear  
transformer charger of similar rating will typically consume  
1 W to 4 W at no-load. At $0.12/kWh, the TinySwitch-II can  
therefore reduce energy costs by $1 to $4 per year.  
• Design bias winding circuit to provide approximately  
600 µA at no-load. Figure 2 shows the details.  
• Minimizesecondarycircuitbiascurrents. Uselowcurrent  
feedback Zeners for best tolerance. The very low Zener  
bias current in this design will provide better than
±
10%  
output voltage tolerance.  
• Designtransformerwithlowreflectedvoltagetominimize  
clamplosses.Alargerdevice(TNY266)mayenablefurther  
reduction in VOR  
This no-load performance is achieved by using a transformer  
biaswindingasalowvoltagesourceforTinySwitch-IIoperating  
current. Even without this winding, a TinySwitch-II circuit will  
consume <300 mW at no-load. The bias winding disables the  
internal high voltage current source, which normally powers  
the IC from the DRAIN pin, thereby further reducing power  
consumption.  
• Wind transformer for lowest leakage inductance. Choose  
wire gauges to completely fill winding layers.  
C3  
470 pF  
100V  
R6  
33 Ω  
T1  
L3  
Ferrite  
Bead  
T1 EE13  
LP = 1.9 mH  
L1  
1.0 mH  
D7  
11DQ06  
5 V, 0.6 A  
1
8
C6  
470 µF  
10 V  
VR1  
BZY97-  
C130  
8T  
24 AWG T.I.  
7
3
102T  
D1  
D2  
R3  
1.5 kΩ  
32 AWG  
1N4005 1N4005  
RF1  
8.2 Ω  
1.0 W  
D5  
C5  
47 µF  
16 V  
15T  
1N4007G  
32 AWG  
L
2
R1  
4
R2  
9.2 kΩ  
Q1  
2N3906  
200 Ω  
1/2 W  
D6  
1N4148  
Fusible  
C1  
4.7 µF  
400V  
C2  
4.7 µF  
400V  
85 - 265  
VAC  
C7  
100 µF  
10V  
D
U1  
EN/UV  
BP  
TNY264P  
TinySwitch-II  
N
VR2  
BZX79-  
B5V1  
S
R4  
C4  
U2  
PC817A  
820 Ω  
0.1 µF  
D3  
1N4005  
D4  
1N4005  
50 V  
L2  
Ferrite  
Bead  
R5  
2.4 Ω  
2 W  
RTN  
Figure 1. TinySwitch-II 3.0 W Cell Phone Charger.  
PI-3659-060205  
June 2005  
DI-84  
www.powerint.com  

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