Published:2011/7/7 6:06:00 Author:Lucas | Keyword: Voltage conversion , frequency conversion | From:SeekIC
LM331 is the single voltage / frequency conversion IC within 1.9 v reference voltage, current switch, comparator and flip-flop, etc. In order to expand the range, the circuit is added A1 op amp. The reference current IR is decided by (Rl + R (RPl)), as the internal reference voltage is 1.9 V, IR = l · 9V / (Rl + R (RPl)), the usual range is 100 to 500μA. In addition, the current average value of the current switch output (pin 1) end is I. For the internal chip charge-discharge circuit, when the charging voltage reaches 2A as the supply voltage, the circuit is reset.
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