Datasheet Linear Technology LT3420

Manufacturer	Linear Technology
Series	LT3420

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

	LT3420EDD#PBF	LT3420EDD#TRPBF	LT3420EMS#PBF	LT3420EMS#TRPBF
N	1	2	3	4
Package	3x3 DFN-10 Package Outline Drawing	3x3 DFN-10 Package Outline Drawing	MS-10 Package Outline Drawing	MS-10 Package Outline Drawing
Package Code	DD	DD	MS	MS
Package Index	05-08-1699	05-08-1699	05-08-1661	05-08-1661
Pin Count	10	10	10	10

Parametrics

Parameters / Models	LT3420EDD#PBF	LT3420EDD#TRPBF	LT3420EMS#PBF	LT3420EMS#TRPBF
Demo Boards	DC460A,DC646A,DC690A	DC460A,DC646A,DC690A	DC460A,DC646A,DC690A	DC460A,DC646A,DC690A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no
Integrated Inductor	no	no	no	no
Ishutdown, µA	1	1	1	1
Isupply, mA	0.3	0.3	0.3	0.3
Monolithic	yes	yes	yes	yes
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85
Polyphase	no	no	no	no
Switch Current, A	1.4	1.4	1.4	1.4
Synchronous	no	no	no	no
Topology	Flyback, Photoflash	Flyback, Photoflash	Flyback, Photoflash	Flyback, Photoflash
Vin Max, V	16	16	16	16
Vin Min, V	1.8	1.8	1.8	1.8

Eco Plan

	LT3420EDD#PBF	LT3420EDD#TRPBF	LT3420EMS#PBF	LT3420EMS#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Other Options

LT3420-1

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 (4)

LT3420EDD#PBF LT3420EDD#TRPBF LT3420EMS#PBF LT3420EMS#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Xenon Photoflash Charger