AN8293SA AN8293SC SSOP-24D HSOP024-P-0300A VHSOP-24 - Datasheet Archive

 

Optical Disc Brush-less Spindle Motor Drive IC s Overview AN8293SA 13 (0.5) 5.5±0.3 7.5±0.3 0.15 + 0.1 ­ 0.05

 

AN8293SA AN8293SA, AN8293SC AN8293SC Optical Disc Brush-less Spindle Motor Drive IC s Overview AN8293SA AN8293SA 13 (0.5) 5.5±0.3 7.5±0.3 0.15 + 0.1 ­ 0.05 0.2 1.5±0.2 0.1±0.1 side) to reduce the voltage loss · Short brake built-in · Forward/reverse rotation switching function provided · Current limitation function and thermal protective circuit 0.65±0.1 (AN8293SA AN8293SA), VM=4.5 to 14V(AN8293SC AN8293SC) · Soft switch, snubber-less · Current detection resistor connected to the power supply(VM 0.65±0.1 · Operating supply voltage : VCC=4.25 to 5.5V VM=3.0 to 14V 6.5±0.3 ue pl d in an c se ed lud pl vi an m m es si tf ed ain ai fo ol t n l ht low disc dis ena ten low tp in o co n an in :// g nt n ce c g pa U in tin t e fo na RL ue ue ype typ ur so a d t d e Pr od ty ni bo yp p c. u e e uc ne t l d tl ife t/s ate cy c/ st en in cl e fo st rm ag at e. io n. 24 12 s Features 1 0.5 Unit : mm M Di ain sc te on na tin nc ue e/ d The AN8293SA AN8293SA and AN8293SC AN8293SC are ICs for driving the Optical Disc spindle motor. They employ three-phase fullwave soft switch driving system, and do not require the capacitor between motor windings (snubber-less). They are suitable for miniaturized brush-less motor drive. 24-pin SSOP Package (SSOP-24D SSOP-24D) built-in AN8293SC AN8293SC 13 (5.2) (6.6) 13.0±0.3 12 1.0 24 0.5 NC 2 NC 3 NC 4 A3 Drive output 3 5 A2 Drive output 2 6 A1 Drive output 1 7 PG 8 Pin No. Symbol 13 H3+ Hall element input 14 H3­ Hall element input 15 VH Hall bias terminal 16 SG Signal GND terminal 17 ECR Torque command reference input terminal 18 EC Torque command input terminal Power GND 19 S/S Start/Stop control terminal H1+ Hall element input 20 BR Brake terminal 9 H1­ Hall element input 21 PCI Current feedback system phase compensation terminal 10 NC 22 VCC Power supply terminal 11 H2+ Hall element input 23 VM Motor power supply terminal 12 H2­ Hall element input 24 CS Current detection terminal M ai nt en an 2.75±0.2 1.25 7.6±0.3 24-pin SOP Package (HSOP024-P-0300A HSOP024-P-0300A) Pin name Pl ea Symbol 1 ce Pin No. 0.2 (3.1) 5.5±0.3 nt in co is /D s Pin Name (1.7) 1.25 0.1 + 0.15 ­ 0.05 (0.05 ~ 0.1) 0.4 1 Unit : mm Pin name s Block Diagram VCC VM 22 23 CS 1.0 Upper side Drive 24 H1+ 8 ­ H1 H3­ VH 11 12 A1 6 A2 5 A3 Lower side Drive H3+ Direction SW H2­ Amp.&Matrix H2+ 9 13 4 7 PG 14 S/S VM 15 TSD Power Supply for Hall Element VM EC 18 ECR 17 Short Brake ­ + 16 19 SG S/S 21 20 PCI BR s Absolute Maximum Rating (Ta=25°C) Parameter Symbol Rating Supply voltage VCC 7 V Supply current ICC 30 mA VM 14.4 In OUT ±1000 mA I15 50 mA Vn cont 0 to VCC Motor drive terminal voltage Output current Note 1) Hall bias current Control signal input voltage Note 2) Power dissipation Unit AN8293SA AN8293SA PD AN8293SC AN8293SC V V 925 mW 1033 mW Operating ambient temperature Topr ­20 to +70 °C Storage temperature Tstg ­55 to +150 °C Note 1) n=4, 5, 6 (n is a pin number) Note 2) n=17, 18, 19, 20 (n is a pin number) s Recommended Operating Range (Ta=25°C) Parameter Range VCC Operating supply voltage Symbol 4.25V to 5.5V AN8293SA AN8293SA VM 3.0V to 14V AN8293SC AN8293SC VM 4.5V to 14V s Electrical Characteristics (VCC=5V, Ta=25°C) Parameter Symbol Condition min typ max Unit Total Circuit current 1 ICC1 V19=0V 0 0.1 mA Circuit current 2 ICC2 V19=5V, IO=0mA 4 8 mA 1 V 2.3 V 5 µA Power Save Circuit start voltage Istart Circuit stop voltage Istop 3.5 V Hall Bias Hall bias voltage VHB 1.0 IHB=25mA 1.6 Hall Amp. Input bias current IBH 1 Common-mode input voltage range VHBR 1.5 Minimum input level VINH 60 Input voltage range (AN8293SA AN8293SA) EC 1 4 Input voltage range (AN8293SC AN8293SC) EC 1 3.9 V ­150 150 mV 150 mV 0.30 A/V V 4.0 V mVP­P Torque Command V Offset voltage ECOF Dead zone ECDZ Input current ECIN EC=ECR=2.5V Input/Output gain ACS RCS=1.0 Output saturation voltage H VOH IO=­300mA 0.9 1.4 Output saturation voltage L VOL IO=300mA 0.2 0.45 V Torque limit current ITL RCS=1.0 350 420 mA 1 V 50 ­5 0.20 0.25 µA ­1 Output 280 Brake Brake operation voltage 3.5 VBrON Brake release voltage VBrOFF Brake current V 5 IBr 15 mA Thermal Protection TSDON Thermal protection hysteresis width Note 1) EC=100mV 180 °C TSD Thermal protection operation Note 1) EC=100mV 50 °C Note 1) These are design reference values, but not guaranteed ones. s Package Power Dissipation PD ­Ta (AN8293SA AN8293SA) PD ­Ta (AN8293SC AN8293SC) 2000 1000 Power Dissipation PD (mW) 800 700 600 500 400 300 200 100 0 Single unit 1800 Power Dissipation PD (mW) (A) Single unit Rthj­a=256.4°C/W PD=488mw (25°C) (B) Glass epoxy board SM (50mm × 50mm × 0.8mm) Rthj­a=135.1°C/W PD=925mw (25°C) 900 1600 1400 1200 1000 800 600 400 200 0 25 50 75 100 125 Ambient Temperature (Ta) 150 (°C) 0 0 25 50 75 100 125 Ambient Temperature (Ta) 150 (°C) s Pin Descriptions Pin name Pin No. 1 Equivalent circuit (Note) NC 3 Description NC 2 Standard waveform NC 4 A3 : Drive output 3 One of three output terminals which directly drive the motor by flowing the current in or out with two power Tr. For A1, A2 and A3, the waveform is deviated respectively by 120°. 23 24 50k 5 A2 : Drive output 2 Same as the above 5 50k 50k 4 6 7 6 A1 : Drive output 1 Same as the above 7 PG : Power ground Common emitter for lower side power Tr of A1, A2 and A3 H1+ : Hall element input Two signals are developed from three Hall elements respectively, and in total 6 signals are developed. Each signal is received by one of 6 terminals including this terminal. *Signal deviated by1­180° from that for H is applied. 8 1k 1k H+ H­ 200µ A Same as the above 9 H1­ : Hall element input 10 NC *Signal deviated by 180° from that for H1+ is applied. Note) The value shown above for such as bias current or resistance is not a guaranteed value, but a design reference one. s Pin Descriptions (cont.) Pin No. Pin name Standard waveform Description Equivalent circuit Same as for H1+ 11 H2+ : Hall element input 1k H2­ : Hall element input H3+ : Hall element input 200µA 1k 1k H+ H­ 180° *Signal deviated by + from that for H2 is applied. 200µA 1k Same as the above 13 H­ 180° *Signal deviated by + is from that for H2 applied. Same as the above 12 1k H+ 1k H+ H­ *Signal deviated by 180° from that for H ­ is 3 200µA applied. 1k Same as the above 14 H3­ : Hall element input 1k H+ H­ 180° *Signal deviated by + is from that for H 3 200µA applied. 15 100µA 15 VH : Hall bias Terminal supplying the current to Hall element 1k 60k 16 SG : Signal ground 30µA 17 ECR : Torque command reference input Terminal to which the reference voltage, giving the command about what amount of current is flowed in the motor, is applied. 30µA 7.5k 17 ECR 200µA 200µA 18 EC s Pin Descriptions (cont.) Pin No. Pin name Standard waveform Description Equivalent circuit 30µA 18 19 20 EC : Torque command input Terminal to which the command, about what amount of current is flowed in the motor, is applied. S/S : Start/Stop control Terminal turning ON/OFF the IC. High : motor rotate Low or Open : motor stop BR : Brake 30µA 7.5k 17 ECR Terminal used to work the short brake. High : Short brake Low or Open : Normal rotation 200µA 200µA 50k 19 30k 30k 60k 50k 20 PCI : Current feedback system phase compensation Terminal adding the capacitance for phase compensation of current feedback loop 22 VCC : Power supply IC power supply terminal 23 VM : Motor power supply Power supply terminal supplying the power for driving the motor CS :Current detection Terminal connecting the resistor to VM and detecting the motor current amount 21 24 18 EC 2k 21 1k 50k s Function Operation Description for AN8293SA AN8293SA 1. Overview The AN8293SA AN8293SA is a silicon monolithic bipolar IC for optical disk brush-less spindle motor drive. The AN8293SA AN8293SA is an IC for optical disk spindle motor drive consisting of the brush-less motor. It employs, snubber-less, threephase full-wave soft switch system and the motor coil block can be constructed with the external capacitor-less type. In addition, also available is the AN8293SC AN8293SC, which is molded in VHSOP-24 VHSOP-24 package, with 1033mW of power dissipation (under 25°C, single unit). The AN8293SA AN8293SA has 488mW of power dissipation (under 25°C, single unit). 2. Features · Three-phase full-wave soft switch drive system, and can be used by snubber-less. · Start/Stop terminal provided. Power saved in stop mode. · The TSD detects the junction temperature and turns off all circuit under high temperature. (It is same as under power saved condition in stop mode) · The voltage setting of EC/ECR allows Normal/Reverse rotation to be changed over. · Hall bias built-in · Short brake built-in 3. Function Description 1) Three-phase full-wave soft switch system (snubber-less system) The AN8293SA AN8293SA employs highly effective three-phase full-wave system, by which current is pulled out or sunk from/into each phase, A1, A2 and A3. A1 A3 A2 Pulled out Current switching for each phase is done with the trapezoidal-wave-shaped linear switching current. The AN8293SA AN8293SA provides snubber-less system, which does not require the external capacitor at coil ends. Sunk into Output current 2) Start/Stop terminal provided and power save in stop mode The circuit operation starts by "H" signal. In stop mode, the entire circuit is turned off and the bias circuit current is not flown either, thus very very small power consumption is realizes. Thus consumption power becomes very small. 3) TSD (Thermal Shunt Down) The TSD detects the junction temperature, and when it exceeds the detection temperature (180°C, typ.), it turns off the entire circuit. Under this condition, the power consumption becomes very small, almost the same as the case when the start/stop terminal is set to the stop condition. The TSD has hysteresis, the width of which is set to 50°C (typ.) and is automatically reset when the temperature decreases. 4) Current limitation The current limitation is achieved through detection of the voltage fall of the resistor (detection resistor) which is connected between Pins23 and 24. The detection voltage is set to 0.35V (typ.). When 1 is connected between Pins23 and 24, the limitation current is : 0.35V 1 =0.35A The fall of voltage between Pins23 and 24 can not affect the rise of saturation voltage. The V6 voltage of upper transistor block is given as follows : V6=VM­Vbe1­Vcesat2 or V6=VM­Vcesat1­Vcs Therefore, Vbe +Vcesat2=Vcesat1+Vcs Vcesat1 ­Vcesat2=Vbe1 ­Vcs If the voltage drop Vcs does not exceed Vbe (the voltage between base and emitter of Q1), assuming that Q1 and Q2 have the same saturation voltage, the saturation voltage of upper side transistor block is not affected. The above calculation can be also applied to the other phases. The current limitation voltage is set to 0.35V. This voltage is lower than the voltage between base and emitter, and therefore the voltage fall due to detection resistance does not have a certain relationship with the saturation voltage, which affects the motor current. Thus, the AN8293SA AN8293SA has the superior current detection system. VM 23 Vcs 24 Q1 Vcesat2 Q2 Vcesat1 V6 Vbe1 6 5 4 5) Reverse rotation brake is available by EC/ECR voltage setting The motor rotation direction can be changed by changing the sequence of current flowing in each output phase through voltage setting with EC/ECR. Voltage difference between EC and ECR is proportional to the motor torque (motor current) (V characteristics). 6) Hall Bias Built-in The AN8293SA AN8293SA incorporates the power supply for Hall element, a position sensor. Hall bias voltage is 1.6V, typ. (VCC=5V, Hall current is 25mA). It is almost stable, even when the supply voltage fluctuates. In addition, Hall element may be connected either in series or in parallel. VCC VCC H1 H2 H3 H2 H1 H3 15 15 Parallel connection Series connection 7) Short Brake Built-in The AN8293SA AN8293SA incorporates the short brake and the motor can be stopped in a short time. 6 5 4 As shown in the left figure, when high signal is applied to the brake terminal 20, the lower side transistors are turned on to set the motor coil to the short condition and the brake operation is executed. Short brake 20 8) Torque Command and Output Current The voltage difference between EC terminal and ECR terminal controls the output current. (Refer to the following figure.) VM­CS (VM­CS) max=0.35V (typ.) Dead zone 50 -150mV G= 0 (VM­CS) (EC­ECR) =0.25 (typ.) EC­ECR The G shown in the above figure and (VM­CS) max. are almost stable, independent of current detection resistance (resistance between VM and CS terminals), RCS. For example, if RCS=1, · Transmission gain Acs from EC terminal voltage to output current is : ACS = G RCS = 0.25 1 = 0.25 (A/V) (typ.) · Output maximum current ITL is : ITL = 0.35V 1.0 = 0.35A (typ.) The RCS should be set at the value of approximately 0.5 to 2.0. 9) Phase Relationship between Hall Input and Output Current @The phase relationship between Hall input and output current when EC < ECR is shown in the following figure : H1 H3 H2 Output current Pulled out Time A3 A2 A1 Sunk into Time When EC > ECR, the pulling-out and sinking-into of the output current is just reversed from those shown in the above figure, and the motor rotation direction is reversed. For Hall input, DC level should be set at 1.5 to 4.0V and the amplitude of each phase (Hn+­Hn­) should be set at 60mVP­P or more. 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