这款光 IC 用于检测激光打印机和数字复印机等设备用写入激光器的光束通道定时。它包含一个高速光电二极管和高速信号处理电路,用于提供稳定的检测定时。
Ro 端子处的模拟振幅(因激光光束通过产生的电压变化)表示为 Vro=电流增益率 x 感光灵敏度 x 外部增益电阻。外部增益电阻的选择应确保 Vro 设置为 2 至 3 V(电阻选择范围为 1 至 10 千欧)。提供并且可选择 4、6 和 20 倍的电流增益率,以匹配激光光束功率。对于双元素型,使用电阻相同的电阻器连接到 Ro1 和 Ro2。
单元素型可以向左或向右扫描,但双元素型应从 Ch 1 到 Ch 2 的方向扫描。
在 0.5 V 及更高电压下可检测到。
为了发挥双元素型提供的优势,即面临功率和温度波动时的定时稳定性,Ro1 和 Ro2 端子电压波形必须在双元素光电二极管的中心形成交叉(X)波形。作为一个计算数据,可以作为输出获得的模拟振幅为 1.5 至 8 V。但如果模拟振幅设置过大,则可能导致由于封装内的杂散光(在 ΔVRo 的约 6% 处发生的杂散光)引发操作故障。设置的上限值略大于 3V(不超过约 6V)时不会引起问题,但模拟振幅过大可能导致难以获得稳定的输出,因此建议不超过 3V。
振幅水平大于等于 1.5 V 时不会引起问题。但如果振幅水平低于 1.5 V,将妨碍从增益电阻端子获得交叉波形,因此在电源和温度波动时的输出将不再稳定。
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