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LB1987H Datasheet(PDF) 5 Page - Sanyo Semicon Device |
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LB1987H Datasheet(HTML) 5 Page - Sanyo Semicon Device |
5 / 17 page No. 6109-5/17 LB1987, 1987D, 1987M, 1987H Continued from preceding page. Pin Function Equivalent circuit diagram Forward/reverse selection. The direction (forward or reverse) is selected by the voltage applied to this pin. (Vth = 2.5 Vtyp at VCC = 5 V) FR A12210 200 Ω FR 200 µA 1/2 VCC VCC VCC VCC VCC ADJ 6 k Ω 500 Ω 6 k Ω 20 µA Input used when the FG amplifier inverting input is used. Connect a feedback resistor between the FGOUT pin and this pin. FGIN– 300 Ω 300 Ω 5 µA FGin(–) FGin(+) A12211 300 Ω FGOUT VCC VCC VCC FC A12212 FGS VCC VCC VCC A12517 GSENSE A12518 Non-inverting input used when the FG amplifier is used as a differential input amplifier. No bias is applied internally. FGIN+ FG amplifier output. This pin includes an internal load resistor. FGOUT Speed control loop frequency characteristics correction. FC Ground for all systems other than the output transistors. Note that the lowest potential of the output transistors is determined by the Rf pin. GND FG pulse output. This pin includes an internal load resistor. (The output impedance is about 3 k Ω.) FGS Power supply for all IC internal circuits other than the output block. This power supply must be stabilized to prevent ripple or other noise from entering the circuit. VCC Ground sensing. The influence of the common ground impedance on Rf can be excluded by connecting this pin to ground near the Rf resistor side of the motor ground wiring that includes Rf. (This pin must not be left open.) GSENSE External torque ripple correction ratio adjustment. To adjust the correction ratio, apply the stipulated voltage to the ADJ pin from a low-impedance external circuit. If the applied voltage is increased, the correction ratio falls, and if the applied voltage is lowered, the correction ratio increases. The range of variation is from 0 to two times the correction ratio when the pin is left open. (This pin is set to about VCC/2 internally, and has an input impedance of about 5 k Ω.) ADJ |
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