H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 9/08 (2006.01) H03K 3/017 (2006.01)
Patent
CA 2480185
A voltage divider splits the input voltage to be regulated between the input voltage node and the dead time pin of a TL494 voltage regulator. Thus, the duty cycle limit varies in inverse proportion to the input voltage node. Accordingly, the duty cycle percentage limit is reduced when the input voltage to be regulated is a relatively high voltage as compared to use in a circuit where the voltage to be regulated is comparatively low with respect to the input voltage range specification for the supply. A small signal transistor is connected in series with the output driver(s) of the TL494 to achieve a safe shutdown condition of the TL494, thereby preventing the output driver(s) from turning on the main power transistor in the absence of adequate V cc voltage.
Arris International Inc.
Bereskin & Parr
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