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LB1841V Datasheet(PDF) 5 Page - Sanyo Semicon Device |
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LB1841V Datasheet(HTML) 5 Page - Sanyo Semicon Device |
5 / 7 page LB1841V No. 4384-5/7 DEL OUT RD H limit L Non-limit (saturation) H L Saturation H • Set current detection circuit (1) When DEL = High When the motor current IM is below the set current Ilimit, the input voltage (IM × Rf) at the – side of the current setting amplifier is smaller than the input voltage at the + side (larger vs. ground). The drive current therefore increases and the output pnp transistor saturates. When this condition is detected, a signal is sent to the set current detection circuit and the RD output becomes High. When the motor current IM reaches the set current Ilimit, the output pnp transistor is in the controlled state and the RD output becomes Low. (2) When DEL = Low When a Low signal is input to the DEL pin, operation of the current setting amplifier is canceled. Therefore as described above, the output transistor saturates and the RD output becomes High. The above conditions are shown in the table below. Output Current Limiter and Setting Current Detection Circuits Block Diagram LIR VLIR VCC VCC VS VM PBC Rf 10RS IM RD P-G DEL RS M Setting current detection circuit |
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