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LT3420EMS-1 PDF预览

LT3420EMS-1

更新时间： 2024-02-27 08:42:15
品牌 Logo 应用领域
凌特 - Linear 闪光灯光电二极管
页数 文件大小 规格书
20页 368K
描述
Photoflash Capacitor Chargers with Automatic Refresh

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中文翻译

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LT3420EMS-1 数据手册

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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 MUSOP Package  
APPLICATIO S  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
*U.S. Patent #6,518,733  
■
Digital Camera Flash Unit  
■
Film Camera Flash Unit  
■
High Voltage Power Supplies  
U
TYPICAL APPLICATIO  
T1  
T1  
1:10  
V
1:12  
V
BAT  
BAT  
1.8V TO 6V  
320V  
320V  
1.8V TO 6V  
8
1
5
6
5,6  
4
C1  
4.7µF  
D1  
C1  
4.7µF  
D1  
3,4  
51.1k  
3
DANGER HIGH VOLTAGE  
OPERATION BY HIGH VOLTAGE  
TRAINED PERSONEL ONLY  
DANGER HIGH VOLTAGE  
OPERATION BY HIGH VOLTAGE  
TRAINED PERSONEL ONLY  
60.4k  
2
3
R
FB  
6
SW  
SEC  
2
3
6
SW  
SEC  
C3  
C3  
V
V
R
FB  
BAT  
BAT  
100µF  
330V  
PHOTOFLASH  
CAPACITOR  
+
220µF  
330V  
+
4
V
4
7
V
CC  
7
CC  
V
V
CC  
CC  
2.5V TO 6V  
2.5V TO 10V  
C2  
C2  
PHOTOFLASH  
CAPACITOR  
4.7µF  
4.7µF  
LT3420-1  
LT3420  
9
9
CHARGE  
DONE  
CHARGE  
DONE  
CHARGE  
DONE  
CHARGE  
DONE  
1
1
8
8
R
REF  
R
REF  
GND  
C
T
GND  
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: GENERAL SEMICONDUCTOR 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: GENERAL SEMICONDUCTOR GSD2004S SOT-23  
DUAL DIODE. DIODES CONNECTED IN SERIES  
3420 F02  
3420 F01  
Figure 1. High Charge Rate LT3420 Photoflash Circuit  
Figure 2. Small Size LT3420-1 Photoflash Circuit  
3420fa  
1
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中文翻译

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