Datasheet Linear Technology LT3420EDD-1#TRPBF

Manufacturer	Linear Technology
Series	LT3420-1
Part Number	LT3420EDD-1#TRPBF

Photoflash Capacitor Chargers with Automatic Refresh

Datasheets

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PDF, 253 Kb, Revision: B, File uploaded: Sep 18, 2017

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Packaging

Package	3x3 DFN-10
Package Code	DD
Package Index	05-08-1699

Parametrics

Demo Boards	DC460A,DC646A,DC690A
Design Tools	LTspice File
Export Control	no
Integrated Inductor	no
Ishutdown	1 µA
Isupply	0.3 mA
Monolithic	yes
Number of Outputs	1
Operating Temperature Range	0 to 85 °C
Polyphase	no
Switch Current	0.9 A
Synchronous	no
Topology	Flyback, Photoflash
Vin Max	16 V
Vin Min	1.8 V

Eco Plan

RoHS

Compliant

Other Options

LT3420

Design Notes

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Photoflash Capacitor Charger Has Fast Efficient Charging and Low-Battery Drain &mdash DN303
PDF, 106 Kb, File published: Feb 1, 2003
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Photoflash Capacitor Charger Has Fast Efficient Charging
and Low Battery Drain вЂ“ Design Note 303
Albert Wu
Figure 1a shows a typical LT3420 circuit that can charge
a 220ОјF photoп¬‚ash capacitor to 320V in 3.5 seconds
from a 5V input. Figure 1b shows the charge time as a
function of battery voltage. In Figure 1a, the circuitry to
the right of C4 shows a typical method to generate the
light pulse once the photoп¬‚ash capacitor is charged.
When the SCR is п¬Ѓred, the п¬‚ying lead along the glass
envelope of the Xenon bulb reaches many kilovolts in
potential. This ionizes the gas inside the bulb forming a
low impedance path across the bulb. The energy stored
in the photoп¬‚ash capacitor quickly п¬‚ows through the
Xenon bulb, producing the burst of light needed for
п¬‚ash photography. Introduction
The LTВ®3420 is designed to charge large-valued capacitorsвЂ”such as those used for the strobe п¬‚ashes
of digital and п¬Ѓlm camerasвЂ”to high voltages. These
photoп¬‚ash, or strobe, capacitors range in value from
a hundred microfarads to over a millifarad, with target
output voltages above 300V. Traditional strobe capacitor charging methods are either inefп¬Ѓcient or require
software overhead. The LT3420 provides a compact,
simple to use and efп¬Ѓcient charger solution that requires no software, saving space, battery life, design …

Articles

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LT3420 Charges Photoflash Capacitors Quickly and Efficiently While Using Minimal Board Space &mdash LT Journal
PDF, 105 Kb, File published: May 1, 2002
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DESIGN FEATURES LT3420 Charges Photoflash Capacitors
Quickly and Efficiently While Using
by Albert Wu
Minimal Board Space
Introduction VOUT
50V/DIV VCHARGE
5V/DIV
VBAT = 5V 1s/DIV 3420 F01b Figure 1b. Charging waveform Linear Technology Magazine May 2002 DANGER HIGH VOLTAGE
OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
VBAT
1.8V TO 10V
C1
4.7ВµF T1
1:12
5,6 3,4 320V 8 D1 FLYING
LEAD 1 R1
51.1k
VBAT
VCC
2.5V TO 10V CHARGE
DONE C2
4.7ВµF RFB VCC SW …

Model Line

Series: LT3420-1 (4)

LT3420EDD-1#PBF LT3420EDD-1#TRPBF LT3420EMS-1#PBF LT3420EMS-1#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Xenon Photoflash Charger

Other Names:

LT3420EDD-1TRPBF, LT3420EDD-1 TRPBF, LT3420EDD1#TRPBF, LT3420EDD 1#TRPBF