STR83145 PDF

The device senses the applied ac line potential and automatically switches the rectifier and associated capacitors between a voltage-doubler configuration for line voltages to V and a full-bridge configuration for line voltages greater than V. This eliminates the possibility of user error with adjustable jumpers or switches. Also, the related switch-mode power stage need operate only over a reduced range of dc input voltages when compared with "wide input" power supplies using a bridge rectifier only. The reduction in dc input voltage range permits the use of lower-voltage capacitors and leads to a reduction in power stage stresses and power dissipation. The internal sensitive-gate triac is switched by a temperaturecompensated constant-current gate driver driven by a 15 kHz pulse train to reduce power dissipation.

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