NATIONAL SEMICONDUCTOR LM2754 User's Manual
Summary
This high-efficiency DC/DC converter regulates current up to 800mA for driving parallel LED arrays in Flash or Torch modes. The integrated chip features time-out protection circuitry, adaptive gain selection, and low quiescent current, maximizing performance efficiency while protecting the LEDs. This manual serves as a comprehensive guide, providing detailed pin descriptions, electrical characteristics, and circuit diagrams necessary for correct installation. Ideal for engineers developing portable electronics, including mobile phones, digital cameras, and similar devices requiring reliable, high-power flash illumination.
Manual Details
| Brand | National |
|---|---|
| Pages | 11 |
| File Size | 1.03 MB |
| Published | May 31, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
How do I set the desired LED current output?
Connect 1% resistors to ground; the current is approximated by 800 x (1.25V ÷ R).
How can I switch between Flash and Torch operation?
Use the T/F pin: Logic High enables Flash Mode, while Logic Low sets it to Torch Mode.
What prevents excessive flash duration if something goes wrong?
The internal Time-Out circuitry limits the flash duration to 1 second and turns off the device if a faulty prolonged mode occurs.
Does this driver require an external inductor?
No, the LM2754 requires no external inductor for operation.