Datasheet MAX845 (Maxim) - 9

Isolated Transformer Driver for PCMCIA Applications MAX845
TELEPHONE SUBSCRIBER LINE ISOLATION BARRIER 6.8V D1 1k 2W 6 D2 T1 1N5817 V 1 CC 1:2:1 D1 22k Q1 0.1µF IC2 5V @ 50mA C1 100k 2N3906 IC1 TL431 ISO OUTPUT 0.1µF 22k 100k ISO MAX845 2M 4 8 SD D2 GND 3 D3 FS N.C. 680k 100k 1N5817 GND1 GND2 Q2 2 7 100k 2N3904 Figure 7. 5V from Telephone-Subscriber Line VIN ISOLATION 5V 6 BARRIER VCC 24V UNREGULATED 1 1CT
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5CT D1 1N5817 10µF IN 78L05 MAX845 GND 4 8 SD D2 OUT GND1 GND2 R 1N5817 L IOUT 2 7 0k to 1k 4mA to 20mA ISO 3 5V 6 1 49.9k 7 3 MAX480 2N3904 7 IL300 2 0.1V to 0.5V 6 2 4 MAX480 2N3904 2 3 6 4 10k 4 5 49.9k 24.9Ω Figure 8. Typical 4mA/20mA Application Circuit
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