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BA6950FS データシート(PDF) 4 Page - Rohm |
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BA6950FS データシート(HTML) 4 Page - Rohm |
4 / 6 page 487 Motor driver ICs BA6950FS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 4.8V, VB = 4.8V) FCircuit operation (1) Input section (FIN, RIN) Control signals are input from these pins. Current flows from M2 to M1 (forward mode) when FIN is HIGH and RIN is LOW, and from M1 to M2 (reverse mode) when RIN is HIGH and FIN is LOW. Putting FIN and RIN both HIGH re- sults in the brake mode in which the high-side output transistor is turned off to shut down the motor driving cur- rent and the low-side output transistor is turned ON to ab- sorb the counter-electromotive force of the motor, so that a brake is put on the motor. When FIN and RIN are both LOW, both M1 and M2 are left open and the motor stops. Input / output truth table (2) Output section (M1, M2) Two logic inputs control the motor by changing the status of bridge-configured transistors. (3) Output high level voltage Values of current, voltage, and HIGH level output voltage can be set as follows by using external resistors (refer to the application circuit of Fig. 4). S I16 pin (IRT1) I16 pin (IRT1) = V2 pin/R1 S S S 1 S I15 pin (IRT2) I15 pin (IRT2) = I8 pin R5/R4 S S S 2 S V16 pin (VRT1) V16 pin = R3 (I16 pin )I15 pin))R2 I16 pin S S S 3 S V7, 9 pin (M1, M2 voltage; high-side voltage) V7, 9 pin = 4 V16 pin (Typ.) S S S 4 (4) Current feedback amplifier The pin-8 current is increased when the motor rotational speed is reduced by loading, and the current feedback amplifier increases the pin-15 current according to equa- tion 2 . Because the pin-16 voltage then increases ac- cording to equation 3 , the HIGH level output voltage also increases according to equation 4 . In this way, the rotational speed is kept constant by increasing the volt- age applied to the motor. |
同様の部品番号 - BA6950FS |
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同様の説明 - BA6950FS |
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