전자부품 데이터시트 검색엔진 |
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LB1861-E 데이터시트(PDF) 3 Page - ON Semiconductor |
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LB1861-E 데이터시트(HTML) 3 Page - ON Semiconductor |
3 / 8 page Block Diagram and Application Circuit Truth Table ( ): LB1860M, 1861M IN + IN – Ct Rt1 Rt2 CR OUT1 OUT2 RD Mode H L H L — L H L L Full speed L H H L — L L H L Full speed (H) (L) — — (H) (L) (H) (L) (L) (Full speed) (L) (H) — — (H) (L) (L) (H) (L) (Full speed) — — L H L L H H L Low speed ————— HHHH Lock protection Designer’s Notes (1) Variable-speed circuit (Rt and Ct pins) — Refer to the application circuit diagram . The time constant gained by external components C2 and R2 is used to set the length of an ‘off’ operation time period after phase switching. This means that the variable-speed operations can be performed by changing the ‘on’ operation time of each phase through the duty control. . The sawtooth waveform signals are generated by the C2-R2 time constant. The voltage of this signal (Ct pin voltage) increases from 1.3 V to 4.0 V (Vct) at each phase switching. That is, during this period, the driver becomes inactive (toff), in which output circuit is turned off. . If VCC ^ 4.0 V, the driver IC remains active (ton) until the next phase switching. During this period, output circuit is turned on. . If the active drive time of each phase is assumed to ‘to’, the following relation can be established: to =toff +ton ↑↑ Fixed Rotation speed constant proportional constant toff = 0.69 c C2 c R2 ........................................ 1 Constant current circuit Output timing control Unit (resistance: Ω, capacitance: F) Figure 1 ( ): MFP14S 0.47 to 10 µ LB1860,1860M,1861,1861M No. 3 |
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