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LB1987 Datasheet(PDF) 4 Page - Sanyo Semicon Device |
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LB1987 Datasheet(HTML) 4 Page - Sanyo Semicon Device |
4 / 17 page Pin Function Equivalent circuit diagram Control and Current Limiting Functions No. 6109-4/17 LB1987, 1987D, 1987M, 1987H VLIM = 5 V CTLREF: OPEN Gm2 = 1.50 A/Vtyp Gm1 = 0.65 A/Vtyp VCTL 2.35 Vtyp 3.15 Vtyp 01 2 34 5 VCTL = 5 V CTLREF: OPEN VLIM 200 mVtyp 01 2 34 5 Control characteristics Current limiting characteristics Slope = 0.50 A/V typ VLIM = 5 V CTLREF: open Gm2 = 1.50 A/V typ Gm1 = 0.65 A/V typ 2.35 V typ 3.15 V typ 200 mV typ (+) inputs (–) inputs Lower side oversaturation prevention circuit input block OUT for each phase VCTL = 5 V CTLREF: open Pin Functions U phase Hall element input. Logic H refers to the state where IN+ > IN– UIN+ UIN– A12207 200 Ω 100 µA 200 Ω A12208 150 µA VCC Vs Rf(POWER) Rf(SENSE) 200 k Ω 200 Ω 10 µA VCC V phase Hall element input. Logic H refers to the state where IN+ > IN– VIN+ VIN– W phase Hall element input. Logic H refers to the state where IN+ > IN– WIN+ WIN– U phase output. V phase output. (These pins include internal spark killer diodes.) W phase output. UOUT VOUT WOUT A12209 200 Ω 200 µA VCC max LIM 100 µA 200 Ω 200 Ω CTL VCC VCC CTLREF Speed control. This circuit implements constant current drive based on current feedback from the Rf pin. Gm = 0.58 A/V typ at Rf = 0.5 Ω CTL Current limiter function control. The output current can be modified linearly by the voltage on this pin. Slope = 0.5 A/V typ at Rf = 0.5 Ω LIM CTLREF (LB1987/D) Output block power supply. VS Rf(POWER) Rf(SENSE) Output current detection. Current feedback is applied to the control block by inserting the resistor Rf between these pins and ground. Also, both the lower side saturation prevention circuit and the torque ripple correction circuit operate according to the voltage on this pin. In particular, since this voltage sets the oversaturation prevention level, the lower side oversaturation prevention operation can be degraded if the value of this resistor is set too low. Note that the PWR pin and the SENSE pin must be connected together. Continued on next page. |
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