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VTL5C1 Datasheet(PDF) 69 Page - PerkinElmer Optoelectronics |
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VTL5C1 Datasheet(HTML) 69 Page - PerkinElmer Optoelectronics |
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69 / 76 page  64 Application Notes—Analog Optical Isolators This reduced low frequency power rating can be accommodated by using a limited circuit which reduces the limit threshold when the frequency is below 200 Hz. Figure 8a shows a very simple circuit to do this. At low frequency, the gain of amplifier A1 is unity. The amplifier has a 6 db/octave gain roll-off starting at 25 Hz and levels off at 100 Hz. Therefore it will take a signal that is four times as large at 100 Hz as at 25 Hz before limiting action starts. Breakpoints in the Frequency vs. Gain curve shown in Figure 8b can be set to match the speaker frequency dependent power limit. Also, potentiometer R4 can be set to match the power rating and impedance of the speaker. The threshold is set by the sum of VBE of Q1 and the forward voltage drops of D1 and the LED, approximately 2.8V peak or 2.0 VRMS. Once the threshold has been exceeded, current is injected into the LED of the AOI which attenuates the signal voltage. This voltage divider can be placed anywhere in the signal path. Once the limiter comes into play, the system frequency response will no longer be flat, but no distortion is introduced. Automatic Gain Control Automatic gain control (AGC) circuits have electrically programmable references or set points, but in other respects are the same as limiters or compressor circuits. Each has a forward gain amplifier and a loop which controls the gain of that amplifier. Figure 8a. Speaker Power Limiter with Frequency Compensation Figure 8b. Amplitude vs. Frequency for the Amplifier Figure 8c. System Voltage Limits |
Similar Part No. - VTL5C1 |
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Similar Description - VTL5C1 |
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