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BD8256EFV-ME2 Fiches technique(PDF) 21 Page - Rohm |
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BD8256EFV-ME2 Fiches technique(HTML) 21 Page - Rohm |
21 / 53 page 21/49 TSZ02201-0G1G0BK00030-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 4.Apr.2016 Rev.004 www.rohm.com TSZ22111・15・001 BD8256EFV-M ◆ Spindle (SP) Suppose that IO PEAK represents peak output current, IO PEAK can be expressed in the following ways. IO PEAK = 0 ( | VDAC | < VDZSP ) IO PEAK = gmSP × | VDAC | ( gmSP × | VDAC | < ILIMSP ) IO PEAK = ILIMSP ( gmSP × | VDAC | > ILIMSP ) Where VDZSP is input deadzone (single-sided) of 10mV (Typ). The gmSP is output/input gain and ILIMSP is output limit current, and they can be obtained respectively as follows. gmSP = 0.409 / RSPRNF [A/V] ILIMSP = 0.35 / RSPRNF [A] VDAC, the DAC output voltage, can be obtained from DAC register settings through the following equation. MSB=0 : VDAC = 1.0×(bit[10]×0.5 1+bit[9]×0.52+bit[8]×0.53+…+bit[0]×0.511) MSB=1 : VDAC = (-1.0)×(^bit[10]×0.5 1+^bit[9]×0.52+^bit[8]×0.53+…+^bit[0]×0.511+0.511) DAC format (DSP) REG MSB Digital input (BIN) LSB Hex Dec VDAC [V] IO PEAK [A]※ 08h(DSP) 1000_0000_0000 800h -2048 -0.9995 -1.239 1000_0000_0001 801h -2047 -0.9995 -1.239 1111_1110_1011 FEBh -21 -0.0103 -0.013 1111_1110_1100 FECh -20 -0.0098 0 1111_1111_1111 FFFh -1 -0.0005 0 0000_0000_0000 000h 0 0 0 0000_0000_0001 001h +1 +0.0005 0 0000_0001_0100 014h +20 +0.0098 0 0000_0001_0101 015h +21 +0.0103 +0.013 0111_1111_1110 7FEh +2046 +0.9990 +1.238 0111_1111_1111 7FFh +2047 +0.9995 +1.239 *Output voltage saturation and limit current setting are not taken into account in the table. Condition:RSPRNF=0.33Ω -1.06 -1.239 1.24 A/V =gmSP(Input-output Gain) 800h FECh DAC code 0 014h -0.9995 =VDZSP(Input Deadzone) 7FFh +/- 10mV IO PEAK [A] VDAC [V] +1.239 +0.9995 +1.06 =ILIMSP(Limit Current) Figure 13. IO PEAK Characteristics (When set as RSPRNF=0.33 Ω). |
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