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DI-35 PDF预览

DI-35

更新时间: 2022-04-23 23:00:11
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT 音频放大器
页数 文件大小 规格书
2页 326K
描述
16 W Audio Amplifier Power Supply

DI-35 数据手册

 浏览型号DI-35的Datasheet PDF文件第2页 
Design Idea DI-35  
®
TOPSwitch-GX  
16 W Audio Amplifier Power Supply  
Application  
Device  
Power Output  
Input Voltage  
Output Voltage  
Topology  
Audio Amplifier  
TOP245P  
16 W (35 W Peak)  
85-265 VAC  
16 V  
Flyback  
Design Highlights  
The EMI filter has been significantly simplified to three  
components (L1, CX1 and CY1), thanks to the built-in  
frequency jitter function of the TOPSwitch-GX family.  
• No heatsinks required!  
• 77% efficiency (min), at 85 VAC input/35 W output  
• Low no-load input power: < 0.7 W at 230 VAC input  
• Low component count: 37, excluding I/O connectors  
• Stable operation with or without 10,000 µF output buffer  
capacitor  
• Robust transformer design enables 35 W peak power  
• Meets CISPR22B EMI with >10 dB of margin  
• Ideal for both class AB and class D audio amplifiers,  
6 channel Dolby Digital with 6 ohm speakers  
The RCD network of C4, R3, R4, and D5 limits (clamps) the  
peak voltage that the U1-DRAIN sees. A glass-passivated  
normal recovery diode (D5) recycles stored leakage energy,  
increasingoverallefficiency.DRAINringingisdampenedby  
R4 (necessary when a normal recovery diode is used).  
The bias winding provides operating power and feedback  
current to the CONTROL pin of U1. The U2-LED, R8 and  
VR1 comprise the feedback circuit that senses the output  
voltage. ThecurrentthroughtheU2-LEDregulatestheoutput  
voltage by modulating the feedback current that flows into  
the CONTROL pin of U1.  
Operation  
Many of the built-in TOPSwitch-GX features have been used  
to reduce the component count, transformer size and overall  
cost of this universal input flyback power supply. Designed  
around a TOP245P (DIP-8 package), the device uses PCB  
copper for its heatsink, eliminating the costs of both a heatsink  
and the installation labor. Output diode D7 is also cooled the  
same way.  
Key Design Points  
• Ensure that the control loop has enough phase margin at  
the extremes of the rated input voltage and output load,  
both with and without the output buffer capacitor.  
• A 5% VR1 should be acceptable for an audio amplifier.  
Greater accuracy will require a 2% VR1.  
Resistors R1 and R2 set the nominal under-voltage (UV)  
lockout and overvoltage (OV) shutdown limits to 84 V and  
378 V, respectively. UV lockout protects the supply from  
overheating at low line and eliminates power-up and power-  
down glitches. OV shutdown protects the power supply from  
line surges.  
• OV and UV thresholds are determined by:  
VOV = 225 µA (R1+R2) and VUV = 50 µA (R1+R2).  
CY1  
R6  
C6  
2.2 nF  
(Safety)  
33 470 pF  
1/4 W 100 V  
R3  
C4  
C9  
100 µF  
25 V  
L2  
3.3 µH  
16 V, 1 A /  
2.2 A  
200 k1 nF  
1/2 W 1 kV  
1
3
9,10  
6,7  
D1-D4  
1N4007  
D7  
SB5100  
R1  
C1  
1 MΩ  
100 µF  
400 V  
R7  
10 Ω  
C7  
C8  
RTN  
470 µF 470 µF  
4
5
R2  
1 MΩ  
25 V  
25 V  
R4  
33 Ω  
C5  
1 µF  
50 V  
R8  
150 Ω  
1/4 W  
D5  
L1  
6.8 mH  
0.8 A  
T1  
1N4007G  
D6  
BAV20  
TOPSwitch-GX  
R10  
1 k  
D
S
M
U1  
TOP245P  
C
CX1  
CONTROL  
220 nF  
250 VAC  
U2  
PC817A  
R5  
3.3 Ω  
F1  
C2  
100 nF  
50 V  
3.15 A  
VR1  
IN5244B  
5%  
C10  
47 µF  
25 V  
250 V  
C3  
100 µF  
16 V  
85-265  
VAC  
L
N
PI-3731-070704  
Figure 1. Audio Amplifier Power Supply.  
July 2004  
DI-35  
www.powerint.com  

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