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BD64547MUV Datasheet(PDF) 16 Page - Rohm |
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BD64547MUV Datasheet(HTML) 16 Page - Rohm |
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16 / 39 page  TSZ02201-0P2P0C001400-1-2 16.Nov.2020 Rev.006 TSZ22111 • 15 • 001 16/36 BD64547MUV © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.com 2.8 Explanation of Serial Port · H-Bridge Operation ― continued 2.8.4 Sync. Rect. Control D11: WORD0 / WORD1 At Fast Decay Mode Synchronous rectification, make settings related to reverse energization of the motor current. D11 Sync. Rect. Cont. Function 0 ACTIVE Detects motor current at 0 A, switches synchronous rectification OFF and prevents reverse energization. 1 PASSIVE Permits reverse energization; switches synchronous rectification OFF when current reaches the ITRIP. �������������������� = ���������������� × ��������������������������������(����������������������������_��������������������) (���� × ������������������������) ⁄ [A] ITRIP : is the motor current limit, established by the formula above. VREF : Is the output current value setting voltage. α : is the VREF voltage division ratio. (MODE = H: α = 10, MODE = M: α = 5) Rsense : is the Current detection resistance value. DACvalue(Current_Ratio) : is refer to table below. 2.8.5 DAC value (Current_Ratio) D3 to D6 / D10 to D13: WORD2 MSB D6 / D13 Bit2 D5 / D12 Bit1 D4 / D11 LSB D3 / D10 Current_Ratio [%] 1 1 1 1 100.00 1 1 1 0 98.08 1 1 0 1 95.69 1 1 0 0 92.39 1 0 1 1 88.19 1 0 1 0 83.15 1 0 0 1 77.30 1 0 0 0 70.71 0 1 1 1 63.44 0 1 1 0 55.56 0 1 0 1 47.14 0 1 0 0 38.27 0 0 1 1 29.03 0 0 1 0 19.51 0 0 0 1 9.80 0 0 0 0 Disable 2.8.6 Sync. Rect. Enable D12: WORD0 / WORD1 In current decay mode, D12 value enables or disables synchronous rectification. D12 Sync. Rect. En. Function 0 Disabled No synchronous rectification 1 Enabled Synchronous rectification implemented |
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