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## BA6222 Datasheet(PDF) 6 Page - Rohm

 Part No. BA6222 Description Reversible motor drivers (up to 2A series) Download 11 Pages Scroll/Zoom 100% Maker ROHM [Rohm] Homepage http://www.rohm.com Logo

## BA6222 Datasheet(HTML) 6 Page - Rohm

 6 / 11 page Technical Note6/10BA6219BFP-Y, BA6222www.rohm.com2009.04 - Rev.A○c2009 ROHM Co., Ltd. All rights reserved.2) Output high voltage settingThis function optionally sets output voltage by the output high voltage setting pin and controls the motor rotating speed.However, when the output high voltage is set to a low level, consumption at IC increases. Carry out thermal design withsufficient margin incorporated with the power dissipation (Pd) under the actual application condition taken into account.a) BA6219BFP-YThe circuit diagram associated with the output high voltage setting VR pin is asper shown on the right. The maximum output voltage VOMAX is expressed by:VOMAX = VCC1 - ( VSAT(Q1) + VF(Q2) + VF(Q3) + VF(Q4) )In addition, the relation of VR voltage to output voltage at VOMAX or lower isexpressed by:VOH = VR + ( VF(Q5) + VF(Q6) + VF(Q7) ) - ( VF(Q2) + VF(Q3) + VF(Q4) )VOH = VR + ΔVF ≈ VRΔVF depends on the output current but is nearly VOH=VR. (Reference values; VSAT ≈ 0.25V, VF ≈ 0.75V)b) BA6222As the relationship between the output high voltage setting pin VRvoltage and output high voltage VOH is expressed by:VOH ≈ 4 x VR + VOFSIn such event, VOFS means the offset voltage, which varies in accordwith output current and chip temperature.The VR voltage region can be classified into three categories in accordwith the output state:(A) Output high voltage 0V offset region(B) Fourfold gain region(C) Output voltage saturated regionUsing this function with the VR pin connected to a load which has output impedance of several hundreds ohm mayresult in oscillation. In such event, connect a capacitor of 3300pF or higher to about 0.1μF across VR and GND andmake sure that the motor is free of oscillation.c) Power supply voltage range of VR voltageWhen output voltage control pin (VR) is used:VR < VCC1 - ( VSAT(Q1) + VF(Q5) + VF(Q6) + VF(Q7) )VR ≈ VCC1 - 2.5VVR < VCC2 - ( VSAT(Q3) - VF(Q3) - VF(Q2) ) - ( VF(Q5) + VF(Q6) + VF(Q7) )VR ≈ VCC2 - 1VThe output voltage control function does not operate in the regionoutside this range. In addition, when the VR pin is not used, use byshorting VR to VCC1.3) Switching of rotating direction (FWD/REV)When the rotating direction is changed over by the motor rotating condition, switch the direction after the motor istemporarily brought to the BRAKE condition or OPEN condition. It is recommended to keep the relevant conditions asfollows:via BRAKE: Longer than braking time*.(* the time required for the output L terminal to achieve potential below GND when brake is activated.)via OPEN: The time longer than 1 ms is recommended.OUTVCC2VRVCC1Q1Q2Q3Q4Q5Q6Q7Fig. 17VOHVRBA6219BFP-YBA6222VCC1 - 3VF - VSAT(A)(B)(C)Fig. 18VOHVRControl rangeSaturation rangeFig. 19