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Philips Semiconductors 12 V Voice Coil Motor (VCM) driver and spindle motor drive combination chip Preliminary specification TDA5147CH EQUATIONS Gain from V FLTINP to V FLTOUT : – -------------------------------------------- = 2 – V FLTOUT V FLTINP V refout V refout Gain from V FLTOUT to V ISENS1 (under closed loop V CMINP =V refout ): V FLTOUT – V refout -------------------------------------------- = R1 V ISENS1 – V refout ------------------------------------------ or V FLTOUT – V refout -------------------------------------------- = R2 – V SENS1 Gain of V ISENS1 relative to ∆ V s (voltage across R s ): HAVE V1 – V refout ---------------------------- = 4R V ISENH ------------------ R V1 – V SENS1 -------------------------------- = 4R V ISENL ----------------- R V refout R1 ------ R2 (1) (2) (3) SUB 1 – V refout ------------------------ = 4R V ISENL – V ISENH ------------------------------------------- = R ∆V s --------- or V SENS1 – V refout ----------------------------------------- = 4 R ∆V s (4) Transconductance equation: G m = I coil -------------------------------------------- V FLTINP – V refout ∆V s 1 = --------- × ------------------------------------------ – R s V FLTINP V refout (5) From equation (1): G m = ∆V s --------- R s 2 -------------------------------------------- – V FLTOUT V refout From equation (2): G m = ∆V s --------- × 2 × R2 ------ ( V R1 SENS1 – V refout ) R s 1 1 From equation (3) and (4): G m = ------ × -- × 2 × R2 ------ = 4 R1 R s 1 -- 2 1 × ------ R s R2 × ------- R1 1997 Jul 09 24
Philips Semiconductors 12 V Voice Coil Motor (VCM) driver and spindle motor drive combination chip Preliminary specification TDA5147CH APPLICATION INFORMATION handbook, full pagewidth TDA5147CH PORN POWER-ON RESET V PCNTL PARK DIGITAL CIRCUIT V IPWML, V IPWMH SCNTL1 to 3, SIPWM SENU, SENV, SENWIS VOICE COIL MOTOR DRIVE SPINDLE ACTUATORS MGG847 No external power drivers; dynamic braking for non-power down situations; 2A spindle current; 1.2 A VCM power driver; full-wave spindle mode, PORN monitors for both 5 and 12 V supplies; auto-park in the event of power-down; Auto-brake after park in case of power down. Fig.8 System block diagram. 1997 Jul 09 25
Page 1 and 2: INTEGRATED CIRCUITS DATA SHEET TDA5
Page 3 and 4: Philips Semiconductors 12 V Voice C
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motor-driver

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