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S3056 参数 Datasheet PDF下载

S3056图片预览
型号: S3056
PDF下载: 下载PDF文件 查看货源
内容描述: 5CH BTL马达驱动IC [5CH BTL Motor Drive IC]
分类和应用: 驱动
文件页数/大小: 13 页 / 511 K
品牌: KODENSHI [ KODENSHI KOREA CORP. ]
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S3056  
4. BTL Driver Circuits [Focus, Tracking, Sled, Spindle]  
R4  
R3  
R2  
-
VI-Converter  
Level Shift  
Va(+)  
Iconv  
R1  
Vo(+)  
+
+
PAMP1  
Vin  
-
Iconv(+)  
Bias  
+
Iconv(-)  
+
Vo(-)  
-
R5  
R6  
PAMP2  
Va(-)  
-
R7  
Pref  
BTL Driver Circuits are composed of VI-Converter, Level Shifter and Output power AMP.  
VI-Converter converts voltage of Vin into current [Iconv ]  
Iconv = (Vin – Bias ) / R1[10KΩ]  
[ Closed loop Voltage Gain Calculation ]  
Va(+) = (R2×Iconv ) + Pref  
Va(-) = (-R5×Iconv) + Pref  
Vo(+) = Va(+)×(1 + R4/R3 )  
Vo(-) = Va(-)×( 1 + R7/R6 )  
[ * R2 = R5 , R3 = R6, R4 = R7 * ]  
Focus, Tracking closed loop Voltage Gain [ R2 = 25K, R3 = 10K, R4 = 20K]  
Gain = 20 log [{ Vo(+) - Vo(-) } / (Vin - Bias) ]  
= 20 log [{ Va(+)×( 1 + R3/R4 ) - Va(-)×( 1 + R6/R7 ) } / ( Vin – Bias ) ]  
= 20 log [{(R2×Iconv ) + Pref }×( 1 + R4/R3 )]– [{(-R5×Iconv) + Pref }×( 1 + R7/R6 )]  
(Vin – Bias )  
= 20 log [2×(25K/10K)×{1+(20K/10K)} ]  
= 23.5 [dB]  
Sled closed loop Voltage Gain [R2 = 25K, R3 = 10K, R4 = 10K]  
Gain = 20 log [2× (25K/10K)×{1+(10K/10K)} ]  
= 20 [dB]  
Spindle closed loop Voltage Gain [R2 = 15K, R3 = 10K, R4 = 10K]  
Gain = 20 log [2× (25K/10K)×{1+(10K/10K)} ]  
= 15.5 [dB]  
8
KSD-I7A004-001  
SEPT., 2010 REV. 01