Electronic ballasts using the UBA2021 chip to power compact fluorescent lamps. Scheme, description

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Electronic ballasts. Electronic ballasts using the UBA2021 chip to power compact fluorescent lamps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ballasts for fluorescent lamps

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Schematic diagram of electronic ballast using UBA2021 for powering a 13 W compact fluorescent lamp is shown in fig. 3.33. The widespread use of CFLs led to the need to create another microcircuit.

The specialized chip UBA2024 is one of the latest developments from PHILIPS. Using the UBA2024 allows you to create truly subminiature electronic ballasts for compact fluorescent lamps with a power of 3-15 W (with a maximum lamp current of up to 180 mA).

Rice. 3.33. Schematic diagram of electronic ballast with a power of 13 W (click to enlarge)

Distinctive features of UBA2024:

power MOS transistors integrated into the microcircuit, connected in a half-bridge inverter circuit;
integrated voltage boost circuit diode (bootstrap);
the presence of an internal low-voltage power supply;
maximum (short-term) operating voltage 550 V;
adjustable warm-up and ignition time ("soft" and "hot" start);
the ability to control the frequency of the master oscillator;
the minimum number of external elements.

The block diagram of UBA2024 is shown in fig. 3.34.

Rice. 3.34. Structural diagram of UBA2024 (click to enlarge)

The microcircuit is available in DIP-8 and SO-14 packages. Pin assignment of the UBA2024 chip are given in table. 3.8.

Table 3.8. Pin assignment of the UBA2024 chip

Electronic ballasts using the UBA2021 chip for powering compact fluorescent lamps

Author: Koryakin-Chernyak S.L.

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