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UCC28089D Datasheet(PDF) 11 Page - Texas Instruments |
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UCC28089D Datasheet(HTML) 11 Page - Texas Instruments |
11 / 23 page UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 11 www.ti.com APPLICATION INFORMATION Using the UCC28089 as a Modified Square Wave Inverter Remote or dc-only power systems often require a limited amount of 60-Hz ac line power to supply small appliances. Compatible loads include universal motors, incandescent lamps, and other electronic devices with switched mode power supplies to convert the 110-VAC to lower dc voltages. Many of these devices do not require a perfect sinusoidal line voltage, and acceptable performance can be obtained with a modified square wave voltage. Using the circuit in Figure 5, the UCC28089 can provide the appropriate waveform along with primary side over-current protection. Components RA, RB, and CT are selected to program the desired modified square waveform with the appropriate dead time. UDG-04105 CT 0.1 μF RB 27 kΩ RA 221 kΩ NC 200 Ω 47 μF 12 V Bias VIN = 145 VDC F1 RS 4.7 μF MPSA42 MPSA42 4.7 μF --145 V 145 V 0V VO 110 VAC(rms) 16.7 ms NOTE: CS signal should be selected to limit peak inrush current to acceptable levels. 1N4003 2 1 4 3 7 8 5 6 UCC28089 SYNC DIS CT CS VDD OUTA OUTB GND + -- 6800 pF 6800 pF 50 Ω 200 Ω 200 Ω 50 Ω 200 Ω 20 Ω Figure 5. Modified Square Wave Inverter The high-side gate drives of the inverter in Figure 5 are suitable for low frequency applications with relatively constant duty ratio. The NPN transistors and the charge pump diodes on the high-side gate drives must be rated for high voltage (at least 145 V + VDD). The gates are protected from excessive negative voltage by the diodes shown from gate to source. |
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