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TDA5147CH Datenblatt(PDF) 10 Page - NXP Semiconductors |
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TDA5147CH Datenblatt(HTML) 10 Page - NXP Semiconductors |
10 / 32 page 1997 Jul 09 10 Philips Semiconductors Preliminary specification 12 V Voice Coil Motor (VCM) driver and spindle motor drive combination chip TDA5147CH ENABLE VCM DRIVERS When VPCNTL equals VCC5, the VCM drivers are controlled by VIPWMH and VIPWML. Their duty factor is converted to a voltage at pin VFLTOUT. At a 100% duty factor the VFLTINP voltage is approximately 1 V above Vrefout. At a 0% duty factor the VFLTINP voltage is approximately 1 V below Vrefout. At a 50% duty factor, the voltage level is equal to Vrefout (typically 4 V). The VFLTINP voltage is amplified, filtered and output at VFLTOUT. The voltage at VFLTOUT varies between ±2 V about V refout. The VFLTOUT voltage, in conjunction with the sense resistor amplifier, drives the two VCM drivers as illustrated in Fig.4. The equation describing the transconductance from VFLTINP to Icoil is: In a typical application: The transconductance is variable by selecting external resistors R2/R1 and sense resistors RS. G m I coil V VFLTINP V refout – -------------------------------------------- 2I coil V VFLTOUT V refout – () ----------------------------------------------------- 2 1 gain ----------- R2 R1 -------- 1 RS -------- A/V × × × = = = I coil V FLTINP V refout – -------------------------------------------- 2 4 --- 6.6 k Ω 10 k Ω ------------------ × 1 0.33 ----------- × 1 A/V = = Fig.4 Transconductance model. handbook, full pagewidth V1 V1 61 4R R R 4R R 0.5 VCCV12 R 51 59 Vrefout RS 60 57 Vrefout 45 R2 R1 R 4 Vrefout BUFFER PWM DEC R 3 2 1 MGG846 M voice coil motor ICOIL VISENL VCMN VCMP VISENH VISENS1 VCMINP VFLTINP VIPWMH VIPWML VFLTOUT |
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