- High-voltage high-side current source allows cathode ground indicator operation
- Synchronous boost converter
- Peak conversion efficiency> 90%
- Accurate and programmable LED currents from 60 mA to 500 mA
- LED configuration based on adaptive LED current range
- Dedicated index current source
- Dedicated torch and strobe pin
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Dual-mode control (general-purpose or I 2 C）
- Broken inductance detection
- Output overvoltage protection
- Output and LED short-circuit protection
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400kHz me 2 C-compatible interface
- 12 solder balls, 1.575 mm × 2.1 mm × 0.6 mm micro SMD package (TLA12BCA)
illustrate
The LM3555 is a 2 MHz fixed frequency, current mode synchronous boost converter, driver or single Flash at 500 mA or two series LED flash LEDs at 400 mA. High voltage current sources allow LEDs to terminate with GND planes, eliminating the need for additional returns to be traced back to the IC.
Dual mode control interface, the user can configure a universal LM3555 using two control or I enable pin interfaces 2 Comets allow for a higher level of control. These two interfaces allow access to indicators, auxiliary lights and flash modes. A dedicated strobe pin provides a direct interface to trigger flash events, while an external flare pin provides an advantageous additional method for LEDs in a constant current mode.
The LM3555 can adapt the maximum flash level to the LED/time-based LED flash configuration, either a single LED or two LEDs in series.
Eight protection functions, from overvoltage protection, breaking inductance detection LM3555 provides. The LM3555 has four selectable inductor current limits to help the user select an inductor that is suitable for the design.
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