The LT3750 is a flyback converter designed to rapidly charge large capacitors to a user-adjustable target voltage.
The LT3750 is a flyback converter designed to rapidly charge large capacitors to a user‑adjustable voltage. It features a patented boundary‑mode control scheme that minimizes losses and reduces transformer size, supporting input voltages from 3 V to 24 V.
The handbook provides detailed electrical characteristics, pin descriptions, recommended external components (transformers, diodes, NMOS devices, bypass capacitors), safety guidelines, and typical application circuits for flash, security, and high‑voltage power supplies.
| Input voltage range | 3 V to 24 V |
|---|---|
| Output voltage adjustability | User‑adjustable |
| Quiescent current (VCC, CHARGE=5 V) | 1.6 mA to 2.5 mA |
A 1:10 primary‑to‑secondary turns ratio is recommended for the flyback transformer.
Choose a diode with a reverse‑recovery time of less than 100 ns.
The output voltage is set by the resistor divider formed by R_VOUT and R_BG; use 1 % tolerance resistors.
Large capacitors charged to high voltage can be lethal; provide a discharge circuit and keep high‑voltage nodes spaced on the PCB.