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BA6238AN データシート(PDF) 11 Page - Rohm |
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BA6238AN データシート(HTML) 11 Page - Rohm |
11 / 16 page Technical Note 11/15 BA6246, BA6246N, BA6247FP-Y, BA6239A, BA6238A, BA6238AN www.rohm.com 2009.04 - Rev.A ○ c 2009 ROHM Co., Ltd. All rights reserved. 2) Output high voltage setting This function optionally sets output voltage by the VR 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 with sufficient margin incorporated with the power dissipation (Pd) under the actual application condition taken into account. Please do not to exceed the VCC1 and VCC2 voltage forced to the VR pin voltage. a) BA6246, BA6246N, BA6247FP-Y The 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 ≈ VR VOL = VSAT(Q7) + VF(Q6) (Reference values; VSAT ≈ 0.2V, VF ≈ 0.7V) In addition, the relation of VREF voltage to output voltage is 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) BA6239A The 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 voltage is 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) VR VCC2 Q1 Q2 OUT GND Q4 Q3 Fig.36 BA6239A VCC2 VCC1 VR Q1 Q2 Q3 Q4 Q5 OUT GND Q6 Q7 Fig.35 BA6246, BA6246N, BA6247FP-Y |
同様の部品番号 - BA6238AN |
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同様の説明 - BA6238AN |
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