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LT3485-2_15

更新时间： 2024-11-10 01:06:55
品牌 Logo 应用领域
凌特 - Linear 双极性晶体管
页数 文件大小 规格书
20页 349K
描述
Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive

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中文翻译

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LT3485-2_15 数据手册

 浏览型号LT3485-2_15的Datasheet PDF文件第2页浏览型号LT3485-2_15的Datasheet PDF文件第3页浏览型号LT3485-2_15的Datasheet PDF文件第4页浏览型号LT3485-2_15的Datasheet PDF文件第5页浏览型号LT3485-2_15的Datasheet PDF文件第6页浏览型号LT3485-2_15的Datasheet PDF文件第7页 
LT3485-0/LT3485-1/  
LT3485-2/LT3485-3  
Photoflash Capacitor  
Chargers with Output Voltage  
Monitor and Integrated IGBT Drive  
U
DESCRIPTIO  
FEATURES  
The LT®3485 family of photoflash chargers are highly inte-  
grated ICs containing complete charger and IGBT drive  
■
Integrated IGBT Driver  
■
Voltage Output Monitor  
■
functions. The patented control technique of the LT3485-x  
allows it to use extremely small transformers. Output voltage  
detection requires no external circuitry. The turns ratio of the  
transformercontrolsthefinalchargevoltage.Whilecharging,  
the output voltage on the capacitor may be monitored by a  
microcontrollerfromthemonitorpin.Eachdevicecontainsan  
on-chiphighvoltageNPNpowerswitch, whichcanwithstand  
negative voltages on the switch pin without an external  
Schottky diode. The device features a VBAT pin, which allows  
the use of two AA cells to charge the capacitor. The internal  
circuitry operates from the VIN pin. The LT3485-0 has a  
primarycurrentlimitof1.4A,whereastheLT3485-3,LT3485-2,  
and LT3485-1 have current limits of 2A, 1A and 0.7A respec-  
tively. These different current limits result in tightly controlled  
input currents.  
Uses Small Transformers: 5.8mm × 5.8mm × 3mm  
■
Operates from Two AA Batteries, Single Cell Li-Ion  
or Any Supply from 1.8V up to 10V  
■
No Output Voltage Divider Needed  
■
No External Schottky Diode Required  
■
Charges Any Size Photoflash Capacitor  
■
Available in 10-Lead (3mm × 3mm) DFN  
Fast Charge Time  
VERSION  
LT3485-3  
LT3485-0  
LT3485-2  
LT3485-1  
INPUT CURRENT (mA)  
CHARGE TIME (sec)  
750  
500  
350  
225  
2.5  
3.7  
5.5  
4.0*  
V
= V  
= 3.6V  
BAT  
IN  
100µF capacitor, 320V. *50µF capacitor  
U
The CHARGE pin gives full control of the part to the user.  
DrivingCHARGElowputsthepartinshutdown.TheDONEpin  
indicates when the part has completed charging. The LT3485  
series of parts are housed in a leadless (3mm × 3mm) DFN  
package.  
APPLICATIO S  
■
Digital Camera and Cell Phone Flash Charger  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 6636021.  
U
TYPICAL APPLICATIO  
LT3485-0 Photoflash Charger Uses High Efficiency 3mm Tall Transformers  
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY  
V
BAT  
320V  
1:10.2  
•
LT3485-0 Charging Waveform  
2 AA OR  
1
2
4
5
1 TO 2 Li-Ion  
4.7µF  
1M  
•
150µF  
PHOTOFLASH  
CAPACITOR  
A
2.2µF  
600V  
V
SW  
BAT  
DONE  
V
OUT  
50V/DIV  
TRIGGER  
1
T
FLASHLAMP  
CHARGE  
GND  
3
2
LT3485-0  
V
TO  
MICRO  
CC  
C
V
IN  
V
MONT  
5V  
AVERAGE  
INPUT CURRENT  
0.5A/DIV  
IGBTPWR  
0.22µF  
3485 TA02  
V
C
= 3.6V  
1s/DIV  
IGBT  
IGBTIN  
IN  
OUT  
IGBTOUT  
= 100µF  
3485 TA01  
34850123fb  
1
1234567...20

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