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LB1927 Arkusz danych(PDF) 6 Page - ON Semiconductor |
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LB1927 Arkusz danych(HTML) 6 Page - ON Semiconductor |
6 / 11 page LB1927 No.6197-6/11 Pin Description Pin No. Pin name Pin function Equivalent circuit 28 1 2 OUT1 OUT2 OUT3 Motor drive output pins. Connect a Schottky diode between these outputs and VCC. 3 GND2 Output ground pin. 5 VM Output block power supply and output current detection pin. Connect a resistor (Rf) between this pin and VCC to detect the output current as a voltage. The output current is limited according to the equation IOUT = VRF/Rf. 4 VCC Power supply pin (except for output block). 6 VREG Regulated power supply output pin (5V output). Connect a capacitor (approx. 0.1 μF) between this pin and ground to stabilize the output. 7 PWM PWM frequency setting pin. Connect a capacitor between this pin and ground. C = 3900pF results in a frequency of about 18kHz. 8 CSD Lock protection circuit operation time setting pin. Connecting a capacitor of about 10 μF between this pin and ground results in a protection circuit operation time of about 3.3 seconds. 9 10 XI XO Crystal oscillator pins. Connect to quartz oscillator to generate the reference clock. When an external clock (of several MHz) is used, the clock signal should be input via a resistor of about 5.1k Ω connected in series with the XI pin. In this case, the XO pin must be left open. Continued on next page. |
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