The UBA2024 is a half-bridge IC and 550 V lamp controller. This device is equipped with 9 ohm switches that espouses standard CFL applications up to 15 W. The number of external components can be reduced to only 17 (compared to the 27 typically required by a discrete driver solution) with high level of integration, and the IC supports NXP’s patented luminous phase. Soft start function, an adjustable internal oscillator and an internal drive function with a high-voltage level shifter for driving the half bridge is included on the IC. The oscillator signal is passed through a divider before being fed to the output drivers to guarantee an accurate 50% duty cycle. Demo board for 120 and 230 VAC is available for this device. To facilitate the engineer fine-tune the board to a given burner specification, it’s also supplied with a calculation tool. Here’s the circuit diagram:
Highlights:
- Maximum voltage of 550 V
- Minimum glow time control
- Soft start
- Easy-to-configure burner specification
- Integrated half-bridge power transistors
- Integrated bootstrap diode
- Integrated low-voltage supply
- Adjustable oscillator frequency
[Source: NXP Application Note]
