TCA3385 MOTOROLA | Alldatasheet
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Technical content
. . Telephone ring signal converter The TCA3385 is a high efficiency telephone ring signal converter designed for use with theTCA3386 (it can also be used stand-alone). These devices, together with a microprocessor, form the basis for a high-performance feature telephone set. The circuit includes a switching regulator which converts the ring 1 signal from the telephone line into a DC supply signal suitable for powering the other devices in the telephone, e.g. TCA3386 and the PI oP suffix MPU, during the ringing phase. aceme © High efficiency step-down DC/DC converter with linear input impedance Power derived from rectified AC ring signal or DC voltage L ZS ng ¢ Drive output for external PNP transistor »_— <i System supply voltage determined by external transistor, coils 16 aS and diodes 1 * Two modes of operation: fixed internal or programmable ring FP suffix detect threshold (7 to 35V) Plastic package © Programmable input impedance between 3K and 15Kohms Case 751G © Ring detect ouput for microprocessor * Lightning and mains protection ications: it i i Ordering information . Applications: telephone set, answering machine, home appliance, TCA3385:DP Plastic DIP Block diagram and typical application circuit Ry 1yF 5000 qh > 8 Current ne 10nF = [] Oe 4 = in mirror : - MPsag2 OnE 7 | ire! Fe iF: iwas7 | sensor ~ RL] a = '2,2mH 8 1 To MPU BZX79C5V6 R20 uF | ee her | .T.]WUI Oe $G407/D Rev. 2 Page 55