68µH 2N3904 1N4148 68µH 680R 1/2W Vcc=20V +/-4V 1000µF TL494 Vref
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High Efficiency Constant Current Source Battery Charging Applications
68µH 2N3904 1N4148 68µH
680R 1/2W Vcc=20V +/-4V 1000µF TL494 Vref Comp
OUTPUT 0.1µF 1.7A, 14-17V 1000µF
DTOC E1E2 180R
1000µF reservoir 0.1R capacitor omitted some applications, with degradation efficiency performance.
Figure TL494 Constant-Current Source. This design note describes 1.7A constant current source battery charging applications. With input 20V, constant current generated loads from charging from Ni-Cd cell battery packs. efficiency better than achieved using very VCE(sat) bipolar transistor, FZT949 FZT789A, switching element. circuit uses Texas Instrument TL494 converter (Please refer Figure speed circuit, using 2N3904 68µH inductor enhances FZT949/FZT789A switching speed Collector-to-0V, drive waveforms shown Figure efficiency achieved. However, using FZT789A will result slightly higher
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Figure FZT949/FZT789A Switching speed-waveforms. Upper Trace: Collector-to-0V; Lower Trace: Drive. case temperature than FZT949 still well within accepted operational specification device. user prefers case temperature lower, than FZT949 preferred device. industry standard switching P-Channel MOSFET (BUZ271 TO220 outline) been substituted Zetex device improve considerably more only available larger package TO220 compared SOT223 FZT789A/FZT949. conclusion, been shown this design note that with selection VCE(sat) Zetex bipolar transistor, high efficiencies achieved much reduced cost compared MOSFET based design.
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