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| Motor driver ICs Spindle and loading motor driver for PD BA6852FP The BA6852FP is a motor driver IC developed for use in PD, CD-ROM and DVD applications. In addition to having a conventional spindle motor driver, it includes a reversible motor driver for use with loading motors to allow easy system construction. FApplications PD, CD-ROM and DVD. FFeatures 1) Power save circuit (three-level switch) allows FG output in power save mode. 2) FGSW allows selection between either three-phase composite output or single-phase output for the FG output. FAbsolute maximum ratings (Ta = 25_C) 3) The output voltage for the loading motor driver can be set using the Vref pin. FRecommended operating conditions (Ta = 25_C) 792 Motor driver ICs FBlock diagram BA6852FP 793 Motor driver ICs FPin descriptions BA6852FP 794 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, VM1 = 12V, and VM2 = 12V) BA6852FP 795 Motor driver ICs BA6852FP FMeasurement circuits (1) Measurement circuit resistance (2) Input / output table Note: Forward EC < ECR Reverse EC > ECR Input voltage H = 2.6V M = 2.5V L = 2.4V 796 Motor driver ICs (3) Measurement circuits ICC1 BA6852FP ICC2 ICC3 : Ammeter A1 value IPS1 = 150A H1*, H2*, H3* = VCC / 2 (V) H1), H2), H3) = VCC / 2 ) 0.1 (V) : Ammeter A1 value PS = OPEN H1*, H2*, H3* = VCC / 2 (V) H1), H2), H3) = VCC / 2 ) 0.1 (V) : Ammeter A1 value IPS3 = 150A H1*, H2*, H3* = VCC / 2 (V) H1), H2), H3) = VCC / 2 ) 0.1 (V) IPS range for which all output pins are open (input conditions 1 to 6) IPSOP : IPS range for only FG and the hall bias operate (input conditions 1 to 6) IPSOFF : PS range for which the output pins are as in the Input / output table (input conditions 1 to 6) : IPSON 797 Motor driver ICs BA6852FP VHB ITL : Voltmeter V1value VPS = 5V IHB = 10mA : (Voltmeter V2value) / 0.5 VPS = 5V EC = 0V (input conditions 1 to 6) IHA : With Hn) = 4.0V, Hn* = 2.5V, the current that flows into Hn) With Hn) = 2.5V, Hn* = 4.0V, the current that flows into Hn* (n = 1, 2, 3) VHAR : Hall input voltage range for which the output pin is as per the Input / output table. VINH : Hall input level for which the output pin is as per the Input / output table. | Hn) *Hn* l Hin* = 2.5V 798 Motor driver ICs BA6852FP EC, ECR : Torque command operation voltage range ECOF : Vary EC until ECR = 2.5V, then Vary EC voltmeter V1 < 3mV. This EC voltage range (see operation notes (2)). : Ammeter value when ECIN EC = 2V and ECR = 2.5V : If the V1 value is V2 when GEC EC = 1.5V, and the V1 value is V3 when EC = 2.0V GEC = {(V2 * V3) / (2.0 * 1.5)} / RNF (RNF = 0.5) VSBON VSBOFF : BRK pin voltage range when all output pins are low. : BRK pin voltage range when all output pins are as per the Input / output table. 799 Motor driver ICs BA6852FP VSWL : FGSW pin voltage range when the hall input and FG output are as per the table below. VSWH : FGSW pin voltage range when the hall input and FG output are as per the table below. VFGH : Voltmeter V1 value (Input / output table, condition 2) IFG = *10A FGSW = 0V VFGL : Voltmeter V1 value (Input / output table, condition 1) IFG = 3mA FGSW = 0V 800 Motor driver ICs BA6852FP VOH VOL : With the output measurement pin made high level according to the input conditions, the V1 value when 600mA flows from that pin. : With the output measurement pin made low level according to the input conditions, the V2 value when 600mA flows from that pin. VHYS : The voltage difference V3 between H1) and H1* that switch the FG pin. EC = 2.5V FGSW = 0V IVMD : Ammeter A1value Output open (input conditions 1 to 6) EC = 0V 801 Motor driver ICs BA6852FP ICC4 : Ammeter A1 value IN1 = 5V, IN2 = 0V : Ammeter A1 value IN1 = 5V, IN2 = 5V : IN1 range for which OUT1 = High, OUT2 = Low (IN2 = Low) IN2 range for which OUT1 = Low, OUT2 = High (IN1 = Low) ICC5 VIH VIL : IN1 range for which OUT1 = Low, OUT2 = High (IN2 = High) IN2 range for which OUT1 = High, OUT2 = Low (IN1 = High) : Ammeter A2 value when IN1 = 2V Ammeter A3 value when IN2 = 2V IIH VCE : Sum of V1 (the value when 200mA is flowing from the output high level pin) and V2 (the value when 200mA is flowing to the output low level pin). 802 Motor driver ICs IREF : Ammeter A1 value IO = 100mA VREF = 9V BA6852FP VREF : VREF pin voltage range for which the output voltage can be controlled FOperation notes (1) Torque command The RNF pin voltage with respect to the torque command input (EC) is as follows. The I / O gain GEC from the EC pin to the RNF (output current) is determined by the RNF detector resistance. GEC = 0.25 / RNF (A / V) The torque limit current ITL is given by ITL = 0.35 / RNF (A). 803 Motor driver ICs (2) Power save The power save pin logic is as follows. BA6852FP (3) Reverse rotation detector The construction of the reverse rotation detector circuit is shown in Fig. 17. (1) Forward (EC < ECR) The phase relationship between the hall input signals H2) and H3) is as shown in Fig.18, and the reverse rotation detector circuit does not operate. (2) Reverse (EC > ECR) The phase relationship between H2) and H3) is opposite to that for forward rotation, and the reverse rotation detector circuit operates to switch the output off and leave it in the open state. Motor operation during reverse detection When EC < ECR, forward rotation (right rotation) When EC > ECR, reverse torque is applied to reduce speed (right rotation) When the motor reverses, the reverse rotation detector operates, and the coil output is opened. Free rotation in the reverse direction by inertia. Stop 804 Motor driver ICs (4) Input / output timing chart (forward rotation) BA6852FP 805 Motor driver ICs (5) Short brake BA6852FP When the BRK pin goes to high level, the upper-side output transistors (three phase) go off, and the lower-side output transistors (three phase) go on. (6) Hall input The hall pins can be connected in series or parallel. 806 Motor driver ICs (7) FG output switch The relationship between the FG output switch pin and the FG output is as follows. BA6852FP (10) VREF pin (output high level voltage setting) The loading block output high level voltage can be set using the VREF pin voltage. The output high level voltage VOH is given by the following formula. VOH = VREF ) IREF R1 ) VBE (Q1) - VBE (Q3) The VREF voltage that brings about the above formula is up to VM2 - VCE (Q2) - VBE (Q3). Do not apply a voltage of more than VM2 to the VREF pin. Short the VREF pin to VM2 if you will not use it. (8) About the input pin applied voltage Do not apply voltage to any of the other pins when the VCC voltage is not being supplied to the IC. In addition, when VCC is being applied, do not apply a voltage more than VCC to any of the other pins. (9) Input pins The loading input pin has a negative temperature characteristic, so when using it, give due consideration to the temperature characteristics. 807 Motor driver ICs (11) Spindle and loading operation conditions When IN1 or IN2 are high level, the spindle is off regardless of the PS pin input. BA6852FP (12) Driver section ground (GND) PGND (pin 14) is the driver section GND, and is not connected to the signal section GND. This is the motor current path, so take care with the PCB track width and arrangement on the PC board. FElectrical characteristics curves (13) Thermal shutdown (TSD) When the junction temperature reaches 175_C (Typ.), the motor output is opened. There is approximately 15_C (Typ.) of temperature hysteresis. 808 Motor driver ICs FExternal dimensions (Units: mm) BA6852FP 809 |
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