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LB1999 Datasheet(PDF) 4 Page - Sanyo Semicon Device |
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LB1999 Datasheet(HTML) 4 Page - Sanyo Semicon Device |
4 / 8 page Control Function and Current Limiter Function Pin Descriptions No. 5975-4/8 LB1999M Control Characteristics Control Limiter Characteristics Slope: 0.50 A/V (typical) Pin No. Pin Function Equivalent circuit Input used when the FG amplifier is used as an inverting input. A feedback resistor must be connected between FGOUT and this pin. 3 FGIN+ Noninverting input used when the FG amplifier is used as a differential input amplifier. No bias is applied internally. 4 FGIN– FG amplifier output. There is an internal resistive load. 5 FGOUT Control reference voltage. While this pin is set to about 0.43 × VCC internally, this voltage can be modified by applying a voltage from a low-impedance circuit. (The input impedance is about 4.3 k Ω). 6 FGS Speed control loop frequency characteristics correction. 9 FC Speed control input. The control implemented is fixed current drive controlled by current feedback from Rf. Gm = 0.58/V (typical) when Rf = 0.5 Ω. 7 CTL Current limiter function control. The output current can be varied linearly by applying a voltage to this pin. The slope is 0.5 A/V (typical) when Rf = 0.5 Ω. 8 LIM U phase Hall element inputs. Logic high is defined as states where IN+ > IN–. 10 11 UIN+ UIN– V phase Hall element inputs. Logic high is defined as states where IN+ > IN–. 12 13 VIN+ VIN– W phase Hall element inputs. Logic high is defined as states where IN+ > IN–. 14 15 WIN+ WIN– Power supply for all internal blocks other than the output block. This voltage must be stabilized so that noise and ripple do not enter the IC. 16 VCC Continued on next page. |
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