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Part Number: LT3420-1
Description: The LT®3420/LT3420-1 charge high voltage photoflash capacitors quickly and efficiently. Designed f...
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LT3420-1
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DataSheet
General Description
LT3420-1 General Description
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.
LT3420-1 Maximum Ratings
VCC Voltage ........................................................... 16V
VBAT Voltage ............................................................ 16V
SW Voltage (Note 2)
LT3420 .................................................................... 38V
LT3420-1.................................................................. 50V
SEC Current ...................................................... ±200mA
RFB Current ........................................................... ±3mA
RREF Voltage ........................................................... 2.5V
CHARGE Voltage...................................................... 16V
CT Voltage .............................................................. 1.5V
DONE Voltage .......................................................... 16V
Current into DONE Pin .......................................... ±1mA
Maximum Junction Temperature .......................... 125°C
Operating Ambient Temperature Range
(Note 3) .............................................. 40°C to 85°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LT3420-1 Features
Charges 220mF to 320V in 3.7 Seconds from 5V (LT3420)
Charges 100mF 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-
Controlled Input Current: 840mA (LT3420) 450mA (LT3420-1)
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 MSOP Package
Charges 100mF 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-
Controlled Input Current: 840mA (LT3420) 450mA (LT3420-1)
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 MSOP Package
LT3420-1 Typical Application
Digital Camera Flash Unit
Film Camera Flash Unit
High Voltage Power Supplies
Film Camera Flash Unit
High Voltage Power Supplies
LT3420-1 Connection Diagram
LT3420-1
PDF/DataSheet Download
- Datasheet: LT3420-1
- File Size: 248908 KB
- Manufacturer: Linear
- Click here to Download
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