Key facts
- Brand
- Linear Technology
- Model
- LT3420-1
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-06
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Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
The LT3420/LT3420-1 are devices designed to charge high voltage photoflash capacitors quickly and efficiently using a flyback topology. They support operation from two AA cells or any supply ranging from 1.8V to 16V, making them suitable for digital and film camera flash units as well as high voltage power supplies.
These controllers feature controlled peak switch current (1.4A for LT3420, 1.0A for LT3420-1) and input current limits. They utilize an output voltage sensing scheme that monitors flyback voltage to regulate the output without requiring a discrete Zener diode or output resistor divider. The devices are available in 10-Lead MSOP and DFN packages.
Linear Technology LT3420-1 specifications
| Charges 220uF to 320V time (LT3420) | 3.7 Seconds from 5V |
|---|---|
| Charges 100uF to 320V time (LT3420-1) | 3.5 Seconds from 5V |
| Controlled Peak Switch Current (LT3420) | 1.4A |
| Controlled Input Current (LT3420) | 840mA |
| Maximum Operating Voltage (Vcc) | 16 V |
Source: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
All Linear Technology LT3420-1 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the typical efficiency of the LT3420?
The device achieves efficient flyback operation with a typical efficiency greater than 75%.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
Is a high voltage Zener diode required for the LT3420?
No, the design does not require a high voltage Zener diode.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
What is the maximum output voltage supported?
The device supports charging capacitors up to 320V.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
Does the LT3420 require a high voltage Zener diode?
No, the design eliminates the need for a high voltage Zener diode.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
What applications are the LT3420/LT3420-1 designed for?
These devices are designed for use in digital camera flash units, film camera flash units, and high voltage power supplies.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet
Does the LT3420/LT3420-1 require a high voltage Zener diode?
No, the device does not require a high voltage Zener diode or an output voltage divider.
From: Linear Technology LT3420/LT3420-1 Photoflash Capacitor Charger Datasheet