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DI-52 PDF预览

DI-52

更新时间: 2022-04-23 23:00:11
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帕沃英蒂格盛 - POWERINT 转换器
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2页 375K
描述
60 W DC-DC Converter

DI-52 数据手册

 浏览型号DI-52的Datasheet PDF文件第2页 
®
Design Idea DI-52  
DPA-Switch™  
60 W DC-DC Converter  
Topology  
Forward Sync. Rect.  
Device  
Power Output  
Input Voltage  
Output Voltage  
Application  
Telecom  
60 W  
36-75 VDC  
DPA426R  
12 V  
Design Highlights  
Resistor R1 programs the under/over voltages and linearly  
reduces the maximum duty cycle with input voltage to  
prevent core saturation during load transients. Components  
D1, D2, C9, and L2 implement a resonant clamp circuit to  
catch and re-circulate the transformer leakage energy during  
normal operation, with Zener VR1 providing absolute  
clamping for transient conditions.  
• Low component count  
• High efficiency: 91.5% at 36 VDC using synchronous  
rectification  
• Capacitor coupled synchronous rectification allows higher  
output voltages without overstressing MOSFET gates  
• No current sense resistor or current transformer required  
• Output overload, open loop and thermal protection  
• 300 kHz switching frequency to allow sufficient  
transformer reset time  
CapacitorC21chargesthegateofQ2,theforwardsynchronous  
rectifier MOSFET. Resistor R21 limits gate oscillation and  
R22 provides gate pull down. Zener diode VR20 limits the  
Q2 gate voltage during conduction and also reverse charges  
(resets) C21 during the Q2 off time.  
• 3.55 x 2.1 x 0.6 inch (approx. 13.4 W/cubic inch)  
Operation  
A similar drive technique is used for the catch synchronous  
rectifier MOSFET Q1 (with C22, R23, R24, and VR21).  
MOSFET Q1 is driven by the transformer (T1) reset voltage  
and operates only when Q2 is off. Diode D20 provides a  
DPA-Switchgreatlysimplifiesthedesigncomparedtoadiscrete  
implementation. The capacitor coupled synchronous rectifier  
driveusedinthisdesignisusefulforhighervoltageoutputs,still  
allowing passive MOSFET drive without gate overvoltage,  
which would result from direct resistor drive.  
C7 1 nF  
1.5 kV  
R14  
10  
L4  
40 µH  
C25  
1 µF  
50 V  
C23  
C24  
100 µF 100 µF  
C20  
C21  
T1  
12 V, 5 A  
10,9  
4,5  
16 V 16 V  
1 nF 2.2 nF  
6,7  
VR20  
15 V  
+ V  
IN  
36-75 VDC  
VR21 R23  
1
R21  
15 V 10 Ω  
D20  
R22  
10 kΩ  
10 Ω  
R20  
0.5 Ω  
1 W  
9,8  
L1  
12 CWQ  
10 FN  
1 µH  
2.5 A  
R24  
10 kΩ  
D1  
R1  
619 kΩ  
1%  
RTN  
ESD1  
Q1  
Si4486  
Q2  
Si4486  
C22  
1 nF  
L3  
2.2 mH  
40 mA  
D3  
BAV19WS  
4
C9  
150 pF  
200 V  
5
2
R10  
D4  
BAV19WS  
C1-C4  
0.22 µF  
U2  
38 kΩ  
R7  
10 kΩ  
1%  
100 V  
C8  
1 µF  
L2  
220 µH  
U1  
U2  
DPA426R  
PC357  
NT  
C13  
100 nF  
D
S
L
DPA-Switch  
D3  
BAV19WS  
CONTROL  
C
D2  
ESD1  
R12  
5.1 Ω  
C17  
R6  
150 Ω  
R4  
R9  
X
F
1 µF  
1.0 Ω  
220 Ω  
VR1  
C15  
10 µF  
10 V  
C5  
SMBJ  
C6  
R3  
0.22 µF  
150 A  
68 µF  
11 kΩ  
10 V  
1%  
-V  
U3  
LMV431  
AIM5X  
IN  
R11  
10 kΩ  
1%  
PI-3550-062403  
Figure 1. DPA426R - 60 W, 12 V, 5 A, DC-DC Converter.  
.
July 2003  
DI-52  
www.powerint.com  

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