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BA6803S Datasheet(PDF) 6 Page - Rohm |
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BA6803S Datasheet(HTML) 6 Page - Rohm |
6 / 7 page R4 = 7.3 R6 < 5 *0.6 0.6 * 5 *0.6 IB (mA) R4 (k Ω) 0.6 R6 (k Ω) Fluorescent tube grid current IB > hFE 816 Audio ICs BA6803S FTiming chart BA6803S (when oscillator frequency is 2kHz) FAttached components (refer to “Circuit operation”) C1 and C2 : input coupling capacitors. VR1 and VR2 : AC sensitivity adjustment and balance ad- justment (3k Ω recommended). C3, R1, C4 and R2 : set the response characteristics with respect to the AC input signal. In the example given, the attack time is about 4mS and the release time is about 1sec. R3 : Pullup resistor for the input switching terminal (pin 8). R6 and R7 : resistor for the grid leak current path (IGleak).Set so that IGleak x R6 (R7) < 0.6V. R4 and R5 : base bias resistors for Q1 and Q2. Conditions for base bias current (IB) flow are VCC = 5V and VF = 0.6V: the base current is given by the following formula. Set resistors R4 and R6 (R5 and R7) so that Q1 and Q2 : grid output inverting transistors. Use transis- tors for which VCEO > VCC ) VEE. R8 to R25 : Resistors that reverse bias the segments and grid when the fluorescent tube is not lit. The application example given is for general cases. Select the resistors to suit the characteristics of the fluorescent tube used. C5 and R26 : set the oscillator frequency. Capacitor C5 should be a component with good tempera- ture characteristics. FOperation notes 1) Adjust the potentiometers VR1 and VR2 (connected to pins 1 and 3) to adjust the 0dB input level and the dis- persion of ch1 and ch2. 2) The temperature characteristic for the lighting limit for the 16th LED is shown in Fig. 6. 3) The external resistor R26 connected to the oscillator (pin 30) should be in the range of 20k Ω and 100kΩ. If it is outside this range, oscillation may stop due to the influ- ence of temperature (see Fig. 7). |
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