DESCRIPTION The M56787FP is a semiconductor integrated circuit in order to drive the spindle motor. MITSUBISHI <CONTROL/ DRIVER IC> M56787FP SPINDLE MOTOR DRIVER PIN CONFIGURATION (TOP VIEW) nc FIO 42] N.C FEATURES Ne @ Low motor echo noise. . 2 41] N.C @3.3V DSP available. ss |3 40] w @ Large power dissipation package(Power Package). @ High motor drive current . res [4] 39] v @ Wide dynamic range. FG (5 38) U @ Motor current control for both motor torque directions. @ Reverse torque mode select [SHORT BRAKING, etc]. G [8] MGND @ Sleep mode. prs [7] TP @FG signal output terminal. @FG pulse select. 8 35 @ Automatic stop. a a oy z am) APPLICATION 10 3 83 CD-ROM, DVD, DVD-ROM, DVD-RAM etc. GND s 32) GND n | vu 31 fo 30 3 29 Rs [15] [28] Hw- Vec2 [16] [27] H+ ec [i7| 26] Hv. EcR [18] 25] Hv+ Vec1 fr9| 24] Hu- HB [20] 23] Hut N.C [21 22) N.C Outline 42P9R-A , N.C: no connection BLOCK DIAGRAM Vee U v a MGND S/S ce Co ; O O-O- O-- --O+ C CURRENT | SENSE & LIMIT Xx ds re ( | oxo oO voe2 (8) mA W : BRS (7) praKine 8 MODE S | GND \ CHANGE 8 120 | MATRIX HCE N.C | REVERSE @) DETECT N.C ! 780 @ : (21) NC FG + . + - + - N.C | FG HALL CONTROL (22) & BIAS N.C ' SELECT (41) FGS OH (42) Nc Hut Hu- Hv+ = Hv- Hw+ Hw- Ce 2)-@- 55 O0-o- O--@! Ec ECR Mm be448eb OOe7372 oTMITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER PIN DESCRIPTIONS Pin No. N.C N.C S/S Start / Stop FGS FG select FG output Ci Phase Compensation Reverse torque mode select GND 12V supply Motor speed control The reference voltage for * Pull-up resistors (10kohm) are included in the circuits connected to [FG] pin. *Note1. Thegd pin (TP) is test terminal. Please make an open the@ pin (TP). ABSOLUTE MAXIMUM RATING (Ta=25C) Motor drive output W Motor drive Vv Motor drive output U Motor GND Test Note1 GND amp. input Hw+ Sensor Hv- amp. input Hu- amp. amp. input Symbol Parameter Conditions Rating Unit Rs Motor supply voltage @pin 16 Vv Vec2 12V supply voltage @pin 16 v Vect 5V supply voltage @pin 7.0 Vv lo Output current Note 2 15 A Sensor amp. . VH(c) Differential input range @-@pins 45 Vv Pt Power dissipation Free Air 1.2 Ww Ke Thermal derating Free Air 9.6 mWw/'C Tj Junction temperature 150 Cc Topr Operating temperature -20 +75 c Tstg Storage temperature -40 +125 Cc *Note2 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation RECOMMENDED OPERATING CONDITIONS Limits J Symbol Parameter Min, Typ. Mac Unit Vect SV Power supply 45 5.0 5.5 v Vec2 12V Power supply 45 12.0 13.2 Vv lo Output drive current _ 1000 mA MM 6249826 00627373 735MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (Vcc1=5V, Vcc2=12V , Ta=25C unless otherwise noted.) a Limits ti . Symbol Parameter Conditions Min, Typ. Max. Unit Vec1 & Vcc2 pin total Current __ __ Isleep Sleep Mode Supply current (at S/S pin low or open) 10 LA Vcc1 & Vcc2 pin total Current lec Supply current (EC=ECR=1.5V) [S/S pin High] }]] 2 | m Vsat Saturation voltage (ea cuvent soon voltage. _ 1.2 19 Vv ECdead- EC <ECR ~60 -30 0 ECdead? Control voltage dead zone EC>ECR 0 730 +60 mV ECR Reference voltage Input range @pin [3.3V DSP available] 0 1.65 3.3 Vv Ec Control voltage Input range @ pin..[3.3V DSP avaitable} 0 1.65 3.3 Vv Gio Control gain lo = Gio / Rsense [A/V] 0.34 0.4 0.46 VN Viim Control limit llim = Viim / Rsense [A] 0.27 0.3 0.33 Vv Hall sensor amp . VH com | common mode input range @-@pins 13 | 44 v VHmin | Hall sensor amp. input signal level} )-@pins 60 _ |{mvVp-p VHb Hall bias terminal output voltage Load current (IHb) =10 mA. 0.6 0.85 1.2 Vv IHb Hail bias terminal sink current 30 mA [S/S]pin input voltage when it starts up the motor. Von Motor start voltage The IC is in the active condition. 2.0 _ _ Vv "The hall bias are available. [S/S]pin input voltage when it stops the motor. Voff Motor stop voltage The IC is in the sleep condition. _ 0.8 v *The hall bias are off. . . . BRS input voltage that the short braking is selected ViH1 BRS input high voltage when the reverse torque. 3.6 Vv . . . BRS input voltage that the free run is selected when ViM BRS input middie voltage the veverse torque. Note3. 1.6 2.2 Vv Vir1 BRS input low voltage ase . rovers tonue reverse braking is selected 0.8 Vv , vo . [FGS} input voltage Vin2 Logic input high voltage when it is HIGH. 2.0 _ Vv , Logic input [FGS] input voltage Vu2 Low voltage when it is LOW. _ _ 0.8 Vv [FG] pin = VoL output low voltage lo current = 1mA _ _ 0.5 Vv *Note3. The ViM is the limit in case of external voltage input control. The free run mode is selected when the BRS pin is open, too. THERMAL CHARACTERISTICS i f | i te Symbol Parameter Function start temperature of IC Function stop temperature of IC Unit Min. Typ. Max. Min. Typ. Max. TSD Thermal Shut Down 165 125 cc MM 6249826 0027374 7lMITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER The relationship with I/O control and the braking mode BRS=LOW REVERSE BRAKING Reverse Torque Current limit: p The braking mode is selected flexibly by using the BRS terminal. The relationship between the EC-ECR (the difference between (EC<control voitage> and ECR <reference voltage> ) and the torque is shown in Figure 1,2 and 3. The current gain is 0.8A/V (at sensing resistor :0.50hm) in forward torque directions, and the dead zone is from OmV to 60mvV. When the reverse brake mode(BRS=Lo) is selected, the coil current gain under the reverse torque control is the same with in forward torque directions. <<# Current limit Forward Torque Figure 1. BRS=Hi SHORT BRAKING Reverse Torque @ When the short brake mode(BRS=Hi) is selected, the coil current under the reverse torque control depends on the back emf. and the coil resistance. 0 t EC - ECR De < Current limit Forward Torque Figure 2. ) When the free run mode(BRS=open) is selected, the coil current under the reverse torque control (EC-ECR>0) becomes zero and in free run 0 EC -ECR situation. 0--60mV ~t Current limit Forward Torque Figure 3. MH be496eb OO27375 Soa ;MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER THERMAL DERATING 6.0 This IC's package is POWER-SSOP, so (w) 4.0W using H board improving the board on which the IC is mounted 50 OW using H-type boa enables a large power dissipation without a heat , sink. For example, using an 1 layer glass epoxy resin = 3.0W using I-type board board, the IC's power dissipation is 2.7W at ze 40 least. And it comes to 4.0W by using an improved . boa 2 layer board. s 2.7W using J-type board The information of the H, |, J type board is shown 2 3.0 in the board information. a 5 bare z 2.0 i, ~s a Se 1.0 7425s Fey, . 0 25 50 75 100 125 150 Ambient Temperature Ta (C) HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 4. Hall elements U Hall v Co Outer loator inputs SO SOURSE wf) REVERSE EC>ECR Output current SINK FORWARD EC<ECR Figure 4. M@ be498eb 00287376 YokSLEEP MODE FUNCTION START / STOP (S/S pin) LOW or OPEN HIGH Motor Stop Motor on Bias off Bias on Hall-Bias off Hall-Bias on Figure 5. FG FUNCTION FG pulse select (FGS pin) LOW or OPEN HIGH NX1 pulse NX3 pulse Figure 6. BRAKING MODE SELECT FUNCTION Braking mode select [BRS] pin HIGH SHORT BRAKE OPEN FREE RUN LOW REVERSE BRAKE Figure 7. MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER Figure 5 shows the sleep mode function. If the [S/S] pin is set to be open or tow, the motor drive outputs have high impedance and the motor stops. Then, the IC bias current wil be a slight current (please refer to the electrical characteristics), and the hall bias output will be cut off. When the [S/S] pin input is high, all the circuits will work. It is possible for user to switch the output pulse numeric by external logic control using FG pulse select terminal [FGS]. Figure 6 shows the FG pulse select function. The FG pin outputs the square pulse signal synchronizing with the hall inputs [Hv+ and Hv-] timming when FGS=LOW or OPEN. When FGS=HIGH, it outputs the square pulse signal of 3 times. The FG pin is pulled-up to Vcc1 by an internal resistor [typ. 10Kohm]. It is possible to select three kinds of mode [the reverse braking,the short braking and the free run] in reverse torque by logic control using the BRS terminal. Figure 7 shows the function table of the braking mode select. It is the reverse braking when BRS is LOW, the short braking when BRS is HIGH and the free run when BRS is OPEN. Mi 624982b 0027377 3460MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT 3q0OWN BONVHD ONDE 104 Please make an open 6 pin(TP) terminal. wn ASNAS LN3YYNnD 412V 10nF EC 77 ECR Control PWM1 Reference BIAS..TSD PWM2 7 Vcc1 HALL BIAS FG REVERSE DETECT Hall bias resistor 5V MM 6249826 0027378 cl?MITSUBISHI <CONTROL / DRIVER IC> M56787FP SPINDLE MOTOR DRIVER AREA OF SAFTY OPERATION {Actual Data] Tpw=500msec ' V ee tee eke eee ' 1 ' troccceoce 2.0 1 T = =a H$e-- + -- --] ! se 14 i ' ' ' aA-ra =a a4 tree er---- toe ' t ' t t t PT yr tras ITP AT TOIT TT Ty stp rt tc tou ' I 1 1 t ' ca eww ow ARP An rete PH ete pee eee eS 4 1 ' i ' I ' P--j-- 243 feted Ld toe 1 I ' I ! too ' I 1 1 1 I te V I 1 t J I protqiecccd ASR Anteater mm pee eee eed it t 1 t I ' 1 a4 t 1 1 1 ' ' roa I ' 1 1 ' ' to ! 1 ' ' ' 1 PTT apr res ATO ITT TT K PKK Ar tw epee tr Hen te I ' ' t t ' te 1 ' t I t 1 4 ' 1 I 1 1 to 1 1 I i ' t ou ' i) 1 i] ' ' toe ' 1 1 1 ' 1 It 1 ' 1 1 1 Q 3 0 2 = rv - o Qo oS Iv] O1 yUedIND Jo}DaNI0D 10 12 16 20 30 50 7 Voltage during corrector and emitter 6 VCE [ volt] (~ Measurement circuits 1 pulse characteristics measured Emitter current control 144294 M@ be456eb 0027379 155