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NJM2640 Datasheet(PDF) 5 Page - New Japan Radio |
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NJM2640 Datasheet(HTML) 5 Page - New Japan Radio |
5 / 7 page NJM2640 - 5 - Lock detection time (Ton) is given by: Where C2 is 0.47uF: Auto Resume Time (Toff) is given by: Where C2 is 0.47uF: In actual application, Lock detection time (Ton) is affected by the mechanical time constant of a motor. Therefore, constant start up must be confirmed in actual evaluation taking operating variations (i.e.Temperature, Voltage change and so on) in consideration. A typical value of C2 is either 0.47uF or 1uF depending on a motor. Lock Protection Lock Alert Out (LA: Pin 3) is a open collector output and R3 is a pull up resister. A typical value of R3 is 10k Ω. It must be noted that Lock Alert Out stays a H state during few hundred milliseconds from power up as shown in the picture below. [] sec 2 Ic Vcl Vch C T ON − = [] sec 22 . 0 10 8 . 3 7 . 0 5 . 2 10 47 . 0 6 6 = × − × × = − − ON T [] sec 13 . 1 10 75 . 0 7 . 0 5 . 2 10 47 . 0 6 6 = × − × × = − − OFF T [] sec 2 Idc Vcl Vch C T OFF − = ton tOFF High Hall input Motor output Ct Teminal voltage LATeminal voltage Returns to normal operation Motor Lock protection period Motor Locked Power supply LA terminal output Hundreds of millimeter second |
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