參數(shù)資料
型號(hào)： LT3420
廠商： Linear Technology Corporation
英文描述： Photoflash Capacitor Chargers with Automatic Refresh
中文描述： 照相閃光燈電容充電器，具有自動(dòng)刷新
文件頁數(shù)： 1/20頁
文件大小： 368K
代理商： LT3420
LT3420/LT3420-1
Photoflash Capacitor
1
3420fa
APPLICATIU
FEATURES
DESCRIPTIOU
The LT
3420/LT3420-1 charge high voltage photoflash
capacitors quickly and efficiently. Designed for use in both
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.
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.
TYPICAL APPLICATIOU
I
Digital Camera Flash Unit
I
Film Camera Flash Unit
I
High Voltage Power Supplies
I
Charges 220
μ
F to 320V in 3.7 Seconds
from 5V (LT3420)
I
Charges 100
μ
F to 320V in 3.5 Seconds
from 5V (LT3420-1)
I
Charges Any Size Photoflash Capacitor
I
Supports Operation from Two AA Cells or Any
Supply from 1.8V to 16V
I
Controlled Peak Switch Current: 1.4A (LT3420)
1.0A (LT3420-1)
I
Controlled Input Current: 840mA (LT3420)
450mA (LT3420-1)
I
Uses Standard Transformers
I
Efficient Flyback Operation (>75% Typical)
I
Adjustable Output
I
Automatic Refresh
I
Charge Complete Indicator
I
No High Voltage Zener Diode Required
I
No Output Voltage Divider Required
I
Small 10-Lead MSOP Package
Chargers with Automatic Refresh
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent #6,518,733
Figure 1. High Charge Rate LT3420 Photoflash Circuit
3420 F01
+
V
CC
CHARGE
DONE
C
T
10
SEC
R
REF
GND
LT3420
V
BAT
R
FB
SW
C2
4.7
μ
F
0.1
μ
F
C1
4.7
μ
F
V
1.8V TO 6V
V
CC
2.5V TO 10V
CHARGE
DONE
51.1k
T1
1:12
320V
3,4
5,6
8
1
2k
D1
C1, C2: 4.7
μ
F, X5R or X7R, 10V
C3: RUBYCON 220
μ
F PHOTOFLASH CAPACITOR
T1: TDK SRW10EPC-U01H003 FLYBACK TRANSFORMER
D1: GENERAL SEMICONDUCTOR GSD2004S SOT-23
DUAL DIODE. DIODES CONNECTED IN SERIES
DANGER HIGH VOLTAGE
OPERATION BY HIGH VOLTAGE
TRAINED PERSONEL ONLY
C3
220
μ
F
330V
PHOTOFLASH
CAPACITOR
4
9
8
5
1
7
6
3
2
Figure 2. Small Size LT3420-1 Photoflash Circuit
3420 F02
+
V
CC
CHARGE
DONE
C
T
10
SEC
R
REF
GND
LT3420-1
V
BAT
R
FB
SW
C2
4.7
μ
F
0.1
μ
F
C1
4.7
μ
F
V
1.8V TO 6V
V
CC
2.5V TO 6V
CHARGE
DONE
60.4k
T1
1:10
320V
3
4
5
6
2k
D1
C1, C2: 4.7
μ
F, X5R or X7R, 6.3V
C3: RUBYCON 100
μ
F PHOTOFLASH CAPACITOR
T1: KIJIMA MUSEN SBL-5.6S-2
D1: GENERAL SEMICONDUCTOR GSD2004S SOT-23
DUAL DIODE. DIODES CONNECTED IN SERIES
DANGER HIGH VOLTAGE
OPERATION BY HIGH VOLTAGE
TRAINED PERSONEL ONLY
C3
100
μ
F
330V
PHOTOFLASH
CAPACITOR
4
9
8
5
1
7
6
3
2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3420-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers with Automatic Refresh
LT3420EDD#PBF 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LT3420EDD#TR 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Photoflash Capacitor Charger w/ Automatic Top-Off
LT3420EDD#TRPBF 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
LT3420EDD-1#PBF 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
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