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LB1861M-TLM-E Datasheet(PDF) 5 Page - ON Semiconductor |
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LB1861M-TLM-E Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 8 page 1 When a fan is rotating, the capacitor is charged at 4 µA (typ) and discharged through the C with pulses according to the rotational speed. 2 When a fan is locked, no discharge occurs through the C and the C voltage rises, turning OFF the output at 0.8 × V IN. 3 When the output is turned OFF, discharge occurs through the C at 0.5 µA (typ). If the lock is not released when the C voltage drops to VTH2, the capacitor is charged to VTH1 again. (At this moment, the output is turned ON.) These operations 2 and 3 repeated at a cycle of approximately t on :toff = 1:6 protect a motor. 4 If the lock is released when the C voltage drops to V TH2, the output is turned ON, starting rotation. (6) Rotation detect signal (RD pin) . Open collector output (Drive mode: ‘‘L’’, Stop mode: ‘‘H’’) (7) Radio noise reducing (Pins B1, B2) . Base pin of Darlington connection output transistor . If radio noises need to be processed properly, the following actions should be taken: 1 Connect a capacitor of 0.01 µ to 0.1 µF between B1 and B2. 2 Connect a capacitor of 0.001 µ to 0.01 µF between OUT and B. If output causes oscillation, add a resistor of 200 Ω to1kΩ in series with a capacitor. (8) Thermal shutdown function . Shutdown the driver output in case of coil short-circuiting and abnormal IC heating. Thermistor-controlled Application Circuit Example Output Timing Chart Noise elimination capacitor Figure 2 ( ): MFP14S Unit (resistance: Ω, capacitance: F) Use of a thermistor enables motor speed to be sensitive to the operating ambient temperature. The Rt pin voltage at Ta = 20 °C has 1.42 ms of ‘toff’ as calculated in expression 4 with the application constant of Figure 2. However, the Rt pin voltage at Ta = 40 °C is reduced into less than the Vct (= 1.3 V) level, which results ina0of‘toff’. This means the 100% duty. t = –C2 c R2 c 1n (VIN –VRt) VIN –VCt ............. 4 Hall input Discharge pulse Ct voltage Output ‘off’ signal OUT1 current OUT2 current All-phase ON waveform Control output waveform Figure 3 LB1860,1860M,1861,1861M No. 5 |
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