PDF SA56202TW Data sheet ( Hoja de datos )

Número de pieza	SA56202TW
Descripción	One-chip motor driver
Fabricantes	Philips
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No Preview Available ! SA56202 One-chip motor driver Rev. 01 — 19 July 2004 Preliminary data sheet 1. General description The SA56202 is a one-chip motor driver IC that is capable to drive all motors of CD or DVD systems: spindle, sled and loading motors and actuators on the optical pick-up unit. The driver intended for the 3-phase, brushless, Hall-commutated spindle motor uses True-Silent PWM. This proprietary technology ensures that all 3-phase motor currents are sinusoidal resulting in an optimally silent driver. Internal regeneration of the back-EMF of the spindle motor enables the driver to operate in current-steering mode without using external power-dissipating sense resistors. The driver intended for the 2-phase sled stepper motor operates in current-steering PWM mode. In addition the IC contains four full-bridge linear channels that can be used to drive a loading motor and 3D actuators (focus, tracking and tilt). The SA56202 is available in an exposed die pad HTSSOP56 package. 2. Features s True-Silent PWM spindle motor driver s Low heat generation due to power-efﬁcient direct full-bridge switching of spindle motor driver s Controlled spindle motor current during acceleration and brake s Reverse torque brake function (full bridge) s Adjustable spindle motor current limiter s Internal regeneration for EMF of spindle motor s Current-steering PWM controlled stepper motor driver for sled s Four class-AB linear channels for loading motor and 3D actuators (focus, tracking and tilt) s Low on-resistance D-MOSFET output power stages s Built-in thermal shutdown, thermal warning and temperature diode s Interfaces to 3 V and 5 V logic s Package with low thermal resistance to heatsink (reﬂowable die pad). 3. Applications s DVD+RW, DVD-RW, DVD-ROM and DVD-RAM s Combi s CD-ROM and CD-RW s Other compact disk media. 1 page Philips Semiconductors SA56202 One-chip motor driver Table 2: Pin description …continued Symbol Pin Description REMF 9 external resistor for EMF regeneration RLIM 10 external resistor for current limit VSS1(SPN) U 11 12 spindle driver ground 1 spindle driver output U VDD1(SPN) V 13 14 spindle driver supply voltage 1 spindle driver output V VSS2(SPN) W 15 16 spindle driver ground 2 spindle driver output W VDD2(SPN) FG 17 18 spindle driver supply voltage 2 frequency generator output VSSD VINSPN 19 20 digital ground spindle driver input voltage for spindle motor current VINREF 21 reference input voltage for all motor drivers VDDA CP1 22 analog supply voltage 23 charge pump capacitor connection 1 CP2 24 charge pump capacitor connection 2 CP3 25 charge pump capacitor connection 3 CTL1 26 driver logic control input 1 CTL2 27 driver logic control input 2 TEMP 28 thermal warning VINSLD1 29 sled driver 1 input voltage for sled motor current VINSLD2 30 sled driver 2 input voltage for sled motor current VSSA VDD(SLD) SLD2O− 31 32 33 analog ground sled driver supply voltage sled driver output 2 negative SLDO2+ 34 sled driver output 2 positive RSLD2 35 external sense resistor for sled driver 2 current sense SLDO1− 36 sled driver output 1 negative SLDO1+ 37 sled driver output 1 positive RSLD1 38 external sense resistor for sled driver 1 current sense TLTO− 39 tilting driver output negative TLTO+ 40 tilting driver output positive TRKO− 41 tracking driver output negative TRKO+ 42 tracking driver output positive VDD(ACT) VSS(LIN) FCSO− 43 44 45 actuator drivers supply voltage linear drivers ground focus driver output negative FCSO+ 46 focus driver output positive LDO− 47 loading driver output negative LDO+ 48 loading driver output positive VDD(LD) 49 loading driver supply voltage 9397 750 12772 Preliminary data sheet Rev. 01 — 19 July 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 5 of 24 5 Page Philips Semiconductors SA56202 One-chip motor driver where NPP indicates the number of pole pairs of the motor. FG has an open-drain output for easy interfacing to 3 V and 5 V logic. 7.7 Sled motor driver Two current-steering PWM channels are available to drive a stepper motor. Per channel an external sense resistor Rsense is used that is connected to ground. A peak-current control loop is implemented that modulates the duty cycle of the PWM signal. See Figure 9. Rext VINSLD 47 kΩ 47 kΩ VVINREF input amplifier +Σ − VVINREF R Q S CLOCK 70 kHz A LOGIC DRIVE DRIVER IO M Rsense 001aaa435 Fig 9. Peak-current control architecture of stepper motor driver. The clock generator has a nominal frequency of fosc/256 = 70 kHz. See Figure 10 for the transfer function from input voltage VVINSLD to output current at a typical Rsense of 0.5 Ω. Input-to-output transconductance gain can be scaled down by connecting an external resistor Rext in series with the input VINSLD. IOUT (A) 1A VVINSLD − VVINREF (V) dead zone −30 mV +1 A/V 30 mV −1 A +1 A/V 001aaa436 Fig 10. Transfer function of stepper motor driver. Both limit current and transconductance gain are related to Rsense in the following way: Transconductance gain, V--I---oi-n- = 2-----×-----R-1---s--e--n---s--e 9397 750 12772 Preliminary data sheet Limit current, ILIM = -2----×----1-R--V--s--e--n---s--e Rev. 01 — 19 July 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 11 of 24 11 Page

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