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BD16805FV-ME2 数据表(PDF) 11 Page - Rohm |
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BD16805FV-ME2 数据表(HTML) 11 Page - Rohm |
11 / 20 page 11/16 BD16805FV-M © 2011 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 TSZ02201-0G2G0BE00010-1-2 06.Oct.2016 Rev.004 3. Lock protection function If hall input signal is stop, the lock protection circuit is determined that detection of lock protection. When the lock protection circuit is detect lock protection, all pre driver output is fix to Low. Terminal CT1 capacitor and lock protection ON time(TON1) TON1(Charging time)=(VLOCKP_H- VLOCKP_L)/(ILOCK/C) C:CT1 Capacity of terminal external capacitor ILOCK:SOURCE current for lock protection detection (TYP.:1µA) VLOCKP_H:Terminal CT1 comparison H voltage(TYP.:3.85V) VLOCKP_L:Terminal CT1 comparison L voltage(TYP.:0.55V) Reference value (example) At CT1=1µF TON1=(3.85-0.55)V/(1µA/1µF)=3.3s At CT1=10µF TON1=(3.85-0.55)V/(1µA/10µF)=33s Our company is recommending the range of 0.1µF-10µF to the capacitor of CT1. CT1 is shorted to GND when the lock protection time is not set. CT1 SW for discharge Constant current 1uA[ TYP ] Figure -3 CT1 Charge Discharge equivalent circuit chart When the lock protection is released and it reactivates, the CT1 capacitor should be completely discharged. Discharge SW of Figure-3 is turned on to integral value 50% as shown in Figure-7, 8. Please raise PWM input DUTY after discharging the CT1 capacitor. ( Reference) The discharge time is decided by the expression of ΔV=(1-e-t/(C×R))×ΔV(initial value). At t=C×R, it becomes the standing fall time of 63.2%. ON resistance of SW for CT1 discharge becomes MAX.=320Ω. (Refer to electric characteristic CT1 terminal item P.3. ) 4. Over power supply voltage output OFF function Over power supply voltage output OFF function is built into as output protection at the over voltage. When the impressed voltage to the terminal VCC becomes 30V (TYP.) or more, all Pre driver output terminal becomes Low. However, it is only STB=Hi as the operation condition. Please note that this function doesn't operate because the current supply also stop in IC at STB=Low (At the standby). Over power supply voltage output OFF function is built into. Please do not exceed the absolute maximum rating so that there is a possibility of destruction when the absolute maximum rating of the power supply voltage is exceeded. |
类似零件编号 - BD16805FV-ME2 |
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类似说明 - BD16805FV-ME2 |
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