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BD63241FV Datasheet(PDF) 16 Page - Rohm |
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BD63241FV Datasheet(HTML) 16 Page - Rohm |
16 / 25 page Datasheet Datasheet 16/22 TSZ02201-0H1H0B101200-1-2 © 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111 • 15 • 001 BD63241FV 3.Mar.2015 Rev.001 a) Lock Protection in normal hall driving When the Hall signal switching (detection in the falling edge) is not detected between 400msec in normal hall driving section, it is judged that the motor is locked. In Fig. 12, the timing chart is shown. 3) UVLO(Under voltage lock out circuit) In the operation area under the guaranteed operating power supply voltage of 16V (typ.), the transistor on the output can be turned OFF at a power supply voltage of 3.9V (typ.). A hysteresis width of 300mV is provided and a normal operation can be performed at 4.2V(typ.). This function is installed to prevent unpredictable operations, such as a large amount of current passing through the output, by means of intentionally turning OFF the output during an operation at a very low power supply voltage which may cause an abnormal function in the internal circuit. About turning off a output voltage at UVLO, It becomes a OFF mode. (Upper MOS FET and Under MOS FET are turned OFF.) 4) Current limit A current passing through the motor coil can be detected on the output current detection resistance to prohibit a current flow larger than a current limit value (motor output off).The current limit value is determined by setting of the IC internal limit(Vcl) :150mV (typ.),and the output current detection resistance value using the following in below equation. When no-use current limit function, RNF terminal is shorted GND. In Figure31, IC small signal GND line should be separated Motor large current GND line connected R1.Same as soft start Capacitor.(Pay attention to design board(b)) item reference) SS Vcl RNF W V U IC small signal GND line Io Motor large current GND line C1 R1 − Vcc SOFT START & CURRENT LIMIT COMP Icss GND Io[A] = Vcl[V] / R1[Ω] = 150[mV] / 0.2[Ω] =0.750[A] Figure 31. small signal and large current GND line PR[W] = Vcl[V] x Io[A] = 150[mV] x 0.75[A] = 0.19[W] Connect detect current resistance(current limit Enable) OK RNF GND short setting (current limit Disable) OK RNF RNF NG Open setting (prohibit,motor GND terminal) Figure30 . Current limit function, RNF terminal setting Ton2 (400msec) Hall driving (normal driving) Output U Output W Output V SOUT (FG signal) Motor stop Lo output ( short brake mode) Toff ( Lock detect off section 5sec) Ton1 (1sec) Hall signal Hall detecting re-start Figure 29. Lock protection operation in normal hall driving FG |
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