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## BA6247FP-Y Datasheet(Arkusz danych) 11 Page - Rohm

 Numer części BA6247FP-Y Szczegółowy opis Reversible motor drivers (for two motors series) Pobierz 16 Pages Scroll/Zoom 100% Producent ROHM [Rohm] Strona internetowa http://www.rohm.com Logo

 11 page Technical Note11/15BA6246, BA6246N, BA6247FP-Y, BA6239A, BA6238A, BA6238ANwww.rohm.com2009.04 - Rev.A○c2009 ROHM Co., Ltd. All rights reserved.2) Output high voltage settingThis function optionally sets output voltage by the VR pin and controls the motor rotating speed. However, when theoutput high voltage is set to a low level, consumption at IC increases. Carry out thermal design with sufficient marginincorporated with the power dissipation (Pd) under the actual application condition taken into account. Please do not toexceed the VCC1 and VCC2 voltage forced to the VR pin voltage.a) BA6246, BA6246N, BA6247FP-YThe circuit diagram associated with the output high voltage setting VR pin is as per shown on the right.The output high and low voltages VOH and VOL are expressed by:VOH = VR + ( VF(Q5) + VF(Q4) ) - ( VF(Q2) + VF(Q3) )VOH ≈ VRVOL = VSAT(Q7) + VF(Q6)(Reference values; VSAT ≈ 0.2V, VF ≈ 0.7V)In addition, the relation of VREF voltage to output voltageis expressed by:VR < VCC1 - VSAT(Q1) - VF(Q4) - VF(Q5)VR < VCC2 - VSAT(Q3) + (VF(Q2) +VF(Q3)) - ( VF(Q4) + VF(Q5) )Therefore, when the VR voltage condition is as follows, the output high voltage is restricted.VR > VCC1 - VSAT(Q1) - VF(Q4) - VF(Q5)VR > VCC2 - VSAT(Q3) + (VF(Q2) +VF(Q3)) - ( VF(Q4) + VF(Q5) )VOH = VCC1 - VSAT(Q1) - VF(Q2) - VF(Q3)VOH = VCC2 - VSAT(Q3)b) BA6239AThe circuit diagram associated with the output high voltage setting VR pin is as per shown on the right.The output high and low voltages VOH and VOL are expressed by:VOH = VR - ( VSAT(Q1) + VF(Q2) )VOL = VSAT(Q3) + VF(Q4)(Reference values; VSAT ≈ 0.1V, VF ≈ 0.7V)In addition, the relation of VREF voltage to output voltageis expressed by:( VSAT(Q1) + VF(Q2) ) < VR < VCC2 - VSAT(Q2) + VF(Q2) + VSAT(Q1)Therefore, when the VR voltage condition is as follows,the output high voltage is restricted.VR > VCC2 - VSAT(Q2) + VF(Q2) + VSAT(Q1)VOH = VCC2 - VSAT(Q2)VRVCC2Q1Q2OUTGNDQ4Q3Fig.36 BA6239AVCC2VCC1VRQ1Q2Q3Q4Q5OUTGNDQ6Q7Fig.35 BA6246, BA6246N, BA6247FP-Y