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LB1895D Scheda tecnica(PDF) 11 Page - Sanyo Semicon Device |
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LB1895D Scheda tecnica(HTML) 11 Page - Sanyo Semicon Device |
11 / 12 page LB1895,1895D — Example of using a comparator to detect the direction of rotation When the phasing is as shown above, the direction of rotation is determined to be ‘‘forward’’ if WCOMPO is low at the rising edge of VCOMPO, and ‘‘reverse’’ if WCOMPO is high at the rising edge of VCOMPO. 1) Reverse full braking method Braking is applied with VC = L until reverse rotation is detected. The moment that reverse rotation is detected, the driving power is turned off or a short pulse is input. 2) Intermittent braking method If braking is applied according to the value obtained by OR logic in VCOMPO and WCOMPO together, for example, reverse braking is applied according to the following timing. As a result, when the rotation speed is fast, braking is applied many times; at slower speeds, braking is applied fewer times. Furthermore, if the VCOMPO and WCOMPO logic combination is changed, the duty of VC = 0 V – 2.5 V also changes. VCOMPO WCOMPO VCOMPO WCOMPO A06729 When VC ^ VCREF When VC % VCREF VCOMPO WCOMPO VC = 2.5V VC = 0V A06730 fig. 1 fig. 2 LB1895, 1895D No.5634-11/12 |
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