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LT3420

更新时间： 2024-11-24 14:57:51
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亚德诺 - ADI 闪光灯电容器
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20页 247K
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具自动刷新功能的照相机闪光灯电容器充电器

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中文翻译

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LT3420 数据手册

 浏览型号LT3420的Datasheet PDF文件第2页浏览型号LT3420的Datasheet PDF文件第3页浏览型号LT3420的Datasheet PDF文件第4页浏览型号LT3420的Datasheet PDF文件第5页浏览型号LT3420的Datasheet PDF文件第6页浏览型号LT3420的Datasheet PDF文件第7页 
LT3420/LT3420-1  
Photoflash Capacitor  
Chargers with Automatic Refresh  
U
FEATURES  
DESCRIPTIO  
The LT®3420/LT3420-1 charge high voltage photoflash  
capacitorsquicklyandefficiently. Designedforuseinboth  
digital and film cameras, these devices use a flyback  
topology to achieve efficiencies up to four times better  
than competing flash modules. A unique adaptive off-time  
control algorithm* maintains current-limited continuous  
mode transformer operation throughout the entire charge  
cycle, eliminating the high inrush current often found in  
modules.  
■
Charges 220µF to 320V in 3.7 Seconds  
from 5V (LT3420)  
■
Charges 100µF to 320V in 3.5 Seconds  
from 5V (LT3420-1)  
Charges Any Size Photoflash Capacitor  
Supports Operation from Two AA Cells or Any  
Supply from 1.8V to 16V  
Controlled Peak Switch Current: 1.4A (LT3420)  
1.0A (LT3420-1)  
■
■
■
■
Controlled Input Current: 840mA (LT3420)  
450mA (LT3420-1)  
The LT3420/LT3420-1 output voltage sensing scheme*  
monitors the flyback voltage to indirectly regulate the  
output voltage, eliminating an output resistor divider or  
discrete zener diode. This feature allows the capacitor to  
be held at a fully charged state without excessive power  
consumption. Automatic refresh (which can be defeated)  
allows the capacitor to remain charged while consuming  
an average input current of about 2mA, at a user-defined  
refresh rate. A logic high on the CHARGE pin initiates  
charging, while the DONE pin signals that the capacitor is  
fully charged.  
■
■
■
■
■
■
■
■
■
Uses Standard Transformers  
Efficient Flyback Operation (>75% Typical)  
Adjustable Output  
Automatic Refresh  
Charge Complete Indicator  
No High Voltage Zener Diode Required  
No Output Voltage Divider Required  
Small 10-Lead MSOP Package  
Small 10-Lead (3mm × 3mm) DFN Package  
U
The LT3420/LT3420-1 are available in 10-Lead MSOP and  
(3mm × 3mm) DFN packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. *Protected by U.S. Patents  
including 6518733.  
APPLICATIO S  
■
Digital Camera Flash Unit  
Film Camera Flash Unit  
High Voltage Power Supplies  
■
■
U
TYPICAL APPLICATIO  
T1  
1:10  
T1  
1:12  
V
(3mm TALL)  
BAT  
V
BAT  
320V  
320V  
1.8V TO 6V  
INPUT CURRENT  
≈450mA  
1.8V TO 6V  
INPUT CURRENT  
≈350mA  
5
8
4
5,6  
C1  
4.7µF  
C1  
4.7µF  
D1  
D1  
3
6
3,4  
51.1k  
1
60.4k  
2
3
6
SW  
2
3
R
FB  
6
SW  
SEC  
C3  
100µF  
330V  
C3  
220µF  
330V  
V
R
BAT  
FB  
V
BAT  
+
+
4
V
7
4
CC  
V
CC  
7
V
SEC  
CC  
V
2.5V TO 6V  
CC  
C2  
2.5V TO 10V  
C2  
PHOTOFLASH  
CAPACITOR  
PHOTOFLASH  
CAPACITOR  
4.7µF  
LT3420-1  
4.7µF  
LT3420  
9
9
CHARGE  
DONE  
CHARGE  
DONE  
CHARGE  
DONE  
CHARGE  
DONE  
1
1
8
8
R
REF  
R
REF  
GND  
C
GND  
T
C
T
10  
5
10  
5
2k  
2k  
0.1µF  
0.1µF  
C1, C2: 4.7µF, X5R or X7R, 6.3V  
C3: RUBYCON 100µF PHOTOFLASH CAPACITOR  
T1: KIJIMA MUSEN SBL-5.6S-2  
D1: VISHAY GSD2004S SOT-23  
DUAL DIODE. DIODES CONNECTED IN SERIES  
C1, C2: 4.7µF, X5R or X7R, 10V  
C3: RUBYCON 220µF PHOTOFLASH CAPACITOR  
T1: TDK SRW10EPC-U01H003 FLYBACK TRANSFORMER  
D1: VISHAY GSD2004S SOT-23  
DUAL DIODE. DIODES CONNECTED IN SERIES  
DANGER HIGH VOLTAGE  
OPERATION BY HIGH VOLTAGE  
TRAINED PERSONNEL ONLY  
3420 F02  
3420 F01  
Figure 1. High Charge Rate LT3420 Photoflash Circuit  
Figure 2. Small Size LT3420-1 Photoflash Circuit  
3420fb  
1
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