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LS7232 Datasheet(PDF) 5 Page - LSI Computer Systems |
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LS7232 Datasheet(HTML) 5 Page - LSI Computer Systems |
5 / 8 page OUTPUT DRIVER DIGITAL COMPARATOR Ø MEMORY Ø POINTER PHASE LOCK LOOP CONTROL LOGIC BUF BUF BUF BUF SYNC CAP DOZE EXT SENS VSS VDD FIGURE 4 LS7231-4 BLOCK DIAGRAM 4 3 2 6 5 1 7 TRIG (+V) (-V) 8 APPLICATION EXAMPLE: A typical implementation of a lamp dimmer circuit is shown in Fig. 5. Here the brightness of the lamp is set by touch- ing the Touch Plate . The functions of different components are as follows: • The 15V DC supply for the chip is provided by Z, D1, R1, C2 and C5. • R2 and C4 generate the filtered signal for the SYNC input for synchronizing the internal PLL with the line frequency. • R3 and C7 act as a filter circuit for the electronic extension. If extensions are not used, the EXT input (Pin 6) should be tied to VDD (Pin 7). • R4, R5, R6 set up the sensitivity of the SENS input. C6 provides noise filtering. • C3 is the filter capacitor for the internal PLL. • R8 provides current limiting and isolation between the chip output and the triac gate. • C1 and L are RF filter circuits. In the case of momentary power failure, the circuit state remains unchanged for a period of up to 1 sec. For longer power interruptions, the output is shut off. ø TRIG SYNC TW TW FIGURE 3. TRIG OUTPUT CONDUCTION ANGLE, Ø 7231-4 040695-5 |
Similar Part No. - LS7232 |
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Similar Description - LS7232 |
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