BD7755RFV-E2

System Motor Driver ICs for CD / DVD / Blu-ray Drive and Recorder System Motor Driver IC for Half Height Drive (Sensor less) BD7755RFV No.10012EAT01 ●Description BD7755RFV are ICs, developed for the spindle motor, actuator coil, tilt coil, stepping motor, SA stepping motor and the loading motor drive of the desktop Blu-ray drive and Blu-ray recorder. Spindle driver adopted sensorless drive system, and the hall sensor (3 pieces) of the motor position detection is not needed, it is suitable for making of flexible cable conserve wiring and the reductions of external parts. The low rotation mode is built in, and stability and low-speed a rotation is achieved. The spindle, stepping and SA stepping use power MOSFET to reduce power consumption and the actuator, tilt, and loading driver use a linear BTL drive system to reduce noise. ●Features 1) The low-speed stability rotation is achieved with built-in the low rotation mode. 2) The hall sensor is unnecessary according to 3 aspect sensorless drive system. 3) The spindle motor driver achieves stability high speed start by ROHM's own energizing method. 4) Highly effective spindle, stepping and SA stepping is achieved by PWM control driver. And the output current detection resistance of stepping and SA stepping is unnecessary by built-in internal detection circuit. 5) The actuator, tilt and loading driver achieve low noise by using linear BTL drive system. 6) ON/OFF of loading and other channels, brake mode of spindle driver and standby mode are selectable by the two control terminals. 7) Built-in thermal-shut down circuit. 8) Improved heat radiation efficiency utilizing HTSSOP package. ●Applications For desktop Blu-ray drive ●Absolute maximum ratings Parameter Symbol Ratings POWER MOS power supply voltage 1 SPVM, SLVM 15 #1 V POWER MOS power supply voltage 2 SAVM 7 #2 V Vcc, AVM, LDVM 15 V DVcc 7 V Pd 1.5 Operating temperature range Topr -20 ~ 70 ℃ Storage temperature Tstg -55 ~ 150 ℃ Junction temperature Tjmax 150 ℃ Preblock/BTL power block power supply voltage PWM control block power supply voltage Power dissipation #1 #2 #3 Unit #3 W POWER MOS output terminals (40~43pin, 46～48pin) are contained. POWER MOS output terminals (35~38pin) are contained. PCB mounting (70mmX70mmX1.6mm, occupied copper foil is less than 3%, glass epoxy standard board). Reduce by 12mW/℃ over 25℃ www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/18 2010.06 - Rev.A Technical Note BD7755RFV ●Recommended operating conditions (Set the power supply voltage with consideration to power dissipation) Parameter Spindle / Sled motor driver power block power supply voltage Symbol Ratings Min. Typ. SPVM,SLVM － Vcc Vcc 10.8 LDVM Unit Max. #4 － V 12 13.2 V 4.3 5.0 Vcc V SAVM,AVM 4.3 5.0 5.5 V PWM control block power supply voltage DVcc 4.3 5.0 5.5 V Spindle driver output current Iosp － 1.0 2.5 Actuator, SA, sled, loading motor driver output current Ioo － 0.5 0.8 Pre block power supply voltage Loading driver power block supply voltage SA, Actuator driver power block power supply voltage #4 #5 #5 A A Set the same supply voltage to SPVM, SLVM and Vcc. The current is guaranteed 3.5A in case of the Short-circuit braking mode and the current which is turned on/off in a duty-ratio of less than 1/10 with a maximum on-time of 5msec www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/18 2010.06 - Rev.A Technical Note BD7755RFV ●Electrical characteristics (Unless otherwise noted, Ta=25℃, Vcc=SPVM=SLVM=12V, DVcc=AVM=SAVM= LDVM=5V, Vc=1.65V,RL=8Ω,RLSP=2Ω) Limits Parameter Symbol Unit Conditions MIN. TYP. MAX. Circuit current Quiescent current 1 IQ1 － 14 30 mA Vcc(Loading OFF) Quiescent current 2 IQ2 － 7.5 16 mA Vcc(Loading ON) Quiescent current 3 IQ3 － 7 14 mA DVcc Standby-on current 1 IST1 － 1.1 2.4 mA Vcc Standby-on current 2 IST2 － 0.16 0.4 mA DVcc Sled driver block Input dead zone (one side) Input output gain Output On resistor (top and bottom) Output limit current PWM frequency VDZSL 0 30 80 mV gmSL 0.75 1.0 1.25 A/V RONSL － 2.2 3.8 Ω ILIMSL 0.8 1.1 1.4 A fosc － 100 － kHz IL=500mA Spindle driver block Input dead zone (one side)1 VDZSP1 20 55 90 mV VLRPM=L Input dead zone (one side)2 VDZSP2 20 240 450 mV VLRPM=H Input output gain 'H' gmSPH 2.68 3.5 4.32 A/V VLRPM=L Input output gain 'L' gmSPL 0.53 0.7 0.87 A/V VLRPM=H Output On resistor (top and bottom) RONSP － 1.0 1.7 Ω IL=500mA Output limit current ILIMSP 1.35 1.6 1.85 A RSPLIM=1.5kΩ fosc － 167 － kHz High voltage VOH － 4.9 － V Low voltage VOL － 0.1 － V Output offset voltage VOFA -50 0 50 mV Output saturation voltage (top and bottom) VOHA － 0.9 1.8 V IL=500mA Voltage gain H GVAH 19.6 21.6 23.6 dB VLRPM=L Voltage gain L GVAL 13.6 15.6 17.6 dB VLRPM=H VDZSA 40 80 160 mV PWM frequency FG output, PRTFLG output 100kΩ pull up to DVcc Focus / Tracking / Tilt driver block SA stepping driver block Input dead zone (one side) Input output gain gmSA 0.15 0.2 0.25 A/V Output On resistor (top and bottom) RONSA － 1.3 2.5 Ω Output limit current ILIMSA 0.28 0.4 0.52 A fosc － 100 － kHz Output offset voltage VOFLD -50 0 50 mV Output saturation voltage (top and bottom) 1 VOLD1 － 0.7 1.6 V IL=500mA LDVM=5V Output saturation voltage (top and bottom) 2 VOLD2 － 2.1 3.6 V IL=500mA LDVM=12V Voltage gain GVLD 15.5 17.5 19.5 dB PWM frequency IL=200mA Loading driver block CTL1,CTL2, LRPM Input high voltage VIH 2.5 － 3.7 V Input low voltage VIL GND － 0.5 V Others VC drop-muting VMVC 0.4 0.7 1.0 V Vcc drop-muting VMVcc 3.45 3.85 4.25 V *This product is not designed to be radiation-resistant. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/18 2010.06 - Rev.A Technical Note BD7755RFV 1 C_COM SPLIM 2 53 GND FG 3 52 SPVM CTL1 4 51 COM CTL2 5 50 W LRPM 6 49 N.C. PRTLIM 7 PRTLIM 48 V SPIN 8 47 U 46 N.C. 45 SPGND 44 SLVM 43 SLO2- 42 SLO2+ 41 SLO1- 40 SLO1+ 39 SL/SAGND 38 SAO2- 37 SAO2+ 36 SAO1- 35 SAO1+ 34 SLDETOUT 33 SLDET TKO- 160kΩ 26.5kΩ 160kΩ 160kΩ 160kΩ 26.5kΩ 160kΩ 26.5kΩ CURR.FEED OSC 17 160kΩ 160kΩ 26.5kΩ 26.5kΩ 18 19 160kΩ 160kΩ 26.5kΩ 26.5kΩ PRE Logic CURR.FEED 26.5kΩ CURR. LIMIT OSC 160kΩ TKIN OSC 26.5kΩ 26.5kΩ 160kΩ 15 16 CURR. LIMIT PRE Logic 26.5kΩ PRE Logic TKO+ 160kΩ 26.5kΩ 20 PRE Logic TLO- 80kΩ AVM/2 TLO+ CURR.FEED OSC 40kΩ 80kΩ AVM/2 FCO- 14 40kΩ FF 13 80kΩ FF AGND LDVM/2 12 AVM/2 11 Logic OSC 10 LDO- FCO+ ×2 T.S.D 80kΩ LDO+ BEMF DETECTER LEVEL SHIFT 9 CURR. FEED FF LDVM 40kΩ FF LDIN STBY BRAKE CONTROL 54 LRPM C_OUT CURR. LIMIT ●Block diagram TLIN 21 FCIN 22 AVM 23 DETECTER CURR.FEED 32 SAVM 24 LEVEL SHIFT 31 SLIN1 VCC 25 LEVEL SHIFT 30 SLIN2 PRTFLG 26 29 SAIN1 DVCC 27 28 SAIN2 VC PROTECT www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 4/18 LEVEL SHIFT 62.6kΩ LEVEL SHIFT 62.6kΩ 2010.06 - Rev.A Technical Note BD7755RFV ●Pin description No. Symbol 1 C_OUT 2 C_COM 3 FG 4 No. Symbol 28 SAIN2 SA driver 2 input 29 SAIN1 SA driver 1 input Frequency generator output 30 SLIN2 Sled driver 2 input CTL1 Driver logic control 1 input 31 SLIN1 Sled driver 1 input 5 CTL2 Driver logic control 2 input 32 SAVM SA driver power block power supply 6 LRPM Low rotation mode change terminal 33 SLDET Sled motor detection signal control input 7 PRTLIM Adjustable resistor connection for actuator protection 34 SLDETOUT Sled motor detection signal output 8 SPIN Spindle driver input 35 SAO1+ SA driver 1 positive output 9 LDIN Loading driver input 36 SAO1- SA driver 1 negative output 10 LDVM Loading driver block power supply 37 SAO2+ SA driver 2 positive output 11 LDO+ Loading driver positive output 38 SAO2- SA driver 2 negative output 12 LDO- Loading driver negative output 39 SL/SAGND Sled/SA driver block pre and power ground 13 AGND BTL driver block GND 40 SLO1+ Sled driver 1 positive output 14 FCO+ Focus driver positive output 41 SLO1- Sled driver 1 negative output 15 FCO- Focus driver negative output 42 SLO2+ Sled driver 2 positive output 16 TLO+ Tilt driver positive output 43 SLO2- Sled driver 2 negative output 17 TLO- Tilt driver negative output 44 SLVM Sled motor driver power supply 18 TKO+ Tracking driver positive output 45 SPGND 19 TKO- Tracking driver negative output 46 N.C. 20 TKIN Tracking driver input 47 U Spindle driver output U 21 TLIN Tilt driver input 48 V Spindle driver output V 22 FCIN Focus driver input 49 N.C. 23 AVM Actuator driver block power supply 50 W 24 VC Reference voltage input 51 COM Motor coil center point input 25 Vcc Pre block power supply 52 SPVM Spindle driver power supply 53 GND 54 SPLIM 26 27 Description Smooth capacitor connection terminal (output side) Smooth capacitor connection terminal (com side) PRTFLG Protection flag output DVcc PWM block control power supply Description Spindle driver power ground N.C. N.C. Spindle driver output W Pre block GND Adjustable resistor connection for spindle driver current limit *Positive/negative of the output terminals is determined in reference to those of the input terminals. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/18 2010.06 - Rev.A Technical Note BD7755RFV ●Equivalent-circuit diagram of the terminals Three-phase motor driver output BEMF voltage detection input 52pin 52 10k 5k 1 48 47 2 50 5k 51 45 5k 10k 53pin PWM driver output SLED1,2 PWM driver output SA1,2 44 32 BTL driver output FC,TK,TL 23 40 41 35 36 14 42 43 37 38 16 17 18 19 15 39 39 13 BTL driver output LD BTL driver input FC,TK,TL,LD PWM driver input SLED1,2 25pin 10 12 11 27pin 9 20 200Ω 21 PWM driver input SA1,2 200Ω 31 22 13 30 53pin 53pin PWM driver input Spindle Spindle current limit input 52pin 27pin 27pin 62.6kΩ 28 54 8 200Ω 29 53pin 53pin www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 53pin 6/18 2010.06 - Rev.A Technical Note BD7755RFV ●Equivalent-circuit diagram of the terminals PRTFLG, FG signal output SLDETOUT signal output 25pin SLED inner detection input 25pin 27pin 3 30Ω 10kΩ 30Ω 26 33 34 10kΩ 53pin 53pin 53pin Actuator current limit input Control signal reference voltage input 25pin 50kΩ 25pin 24 10kΩ 62.6kΩ 50kΩ 200Ω 5kΩ ×2ch 7 53pin 10kΩ ×6ch 53pin ×2ch Control signal input (CTL1) Control signal input (CTL2, LRPM) 25pin 120kΩ 25pin 150kΩ 150kΩ 50kΩ 50kΩ 25pin 100kΩ 50kΩ 180kΩ 270kΩ 6 5 4 50kΩ 20kΩ 20kΩ 50kΩ 50kΩ 150kΩ 150kΩ 53pin 53pin 53pin 53pin 53pin www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/18 2010.06 - Rev.A Technical Note BD7755RFV ●Test circuit 3 52 FG SPVM 40kΩ 9 SPGND 26.5kΩ SL/SAGND 26.5kΩ + OUT 26.5kΩ TK AVM/2 18 19 160kΩ 160kΩ 26.5kΩ 36 20 SAO1- 35 DETECTER 21 TLIN FCIN 22 FCIN AVM 23 24 VCC VC IQVC 25 PRTFLG IQDV DVCC PROTECT OUT+ OUT- 27 DVCC OUT-A V RL 47µH LEVEL SHIFT 62.6kΩ LEVEL SHIFT 62.6kΩ W RLSP 2 SW-RL 2 1 1 SW-IL IL 29 SAIN1 VSAIN2 28 SAIN2 V 2 1 SW-IL VSAIN1 OUTSP U Vo SW-RL 2 2 2-W 2-U 8/18 47µH RLSP SW-RL RLSP 47µH 47µH 2-V 1 IL www.rohm.com VSLIN2 30 1 IL 2 31 1 © 2010 ROHM Co., Ltd. All rights reserved. SAVM VSLIN1 SLIN2 26 100k VSLDET SLIN1 LEVEL SHIFT VCC DVCC 33 SLDET SAVM LEVEL SHIFT DVCC 34 SLDETOUT 32 AVM VC 100k SAO1+ CURR.FEED TKIN TLIN 37 SAO2+ 26.5kΩ 160kΩ 38 SAO2- CURR. LIMIT 26.5kΩ OSC TKO- SLO2 CURR.FEED OSC TKO+ TKIN SLO1+ SAO2 26.5kΩ 26.5kΩ 160kΩ 160kΩ 40 CURR.FEED 39 160kΩ 160kΩ 17 TLO- SLO1- PRE Logic TL AVM/2 26.5kΩ FF + OUT 16 TLO+ 41 OSC 26.5kΩ 160kΩ 160kΩ FCO- SLO2+ SLO1 26.5kΩ 160kΩ 42 CURR. LIMIT PRE Logic AVM/2 FC + OUT 160kΩ PRE Logic 26.5kΩ 43 SLO2- PRE Logic 160kΩ FF 80kΩ FF OSC 80kΩ 15 SLVM CURR.FEED 40kΩ 13 AGND SLVM 44 40kΩ LDVM/2 LD 12 LDO- 45 80kΩ FF + OUT 11 14 N.C. OSC 80kΩ LDO+ FCO+ W 46 T.S.D 10 LDVM SP U LDIN LDVM V CURR. FEED ×2 47 N.C. SAO1 SPIN LDIN 48 OUT V 8 U PRTLIM PRTLIM VSPIN 49 Logic BEMF DETECTER 7 LEVEL SHIFT 6 LRPM LRPM CTL2 LRPM COM 50 W + OUT 5 51 COM + OUT 4 CTL1 CTL1 SPVM + OUT CTL2 GND STBY BRAKE CONTROL DVCC 4.7kΩ 2kΩ 53 C_COM 100k 1 SPLIM 2 2 CCOM 54 1 1 C_OUT + OUT COUT 1 CCOM CURR. LIMIT 2 ISPLIM SW-IL 2010.06 - Rev.A Technical Note BD7755RFV ●Functional description 1-1. Driver logic control terminal 1and 2 (CTL1,2) All drivers and spindle-drive braking modes can be switched on/off by inputting combinations of H-level signal (higher than 2.5V and lower than 3.7V), L-level signal (lower than 0.5V) and HiZ signal (open) to these terminals. ・Driver ON/OFF logic table mode CTL1 CTL2 SP SL(2ch) ACT(3ch) SA(2ch) LOADING ① L, HiZ L, HiZ × × × × × ② H L × ○ × × ○ ③ H HiZ ○ ○ ○ × × ④ L, HiZ H ○ ○ ○ ○ × ○:ON ⑤ H H ○ ○ ○ ○ × ×:OFF ① Stand-by mode The IC is brought into stand-by mode, and its power dissipation can be limited. ② Drivers muting All output channels, except the loading and sled motor are muted and their outputs are turned off. ③ SA mute mode The loading and SA driver are muted. ④⑤ Loading OFF mode Only the loading driver is muted. ・Spindle braking mode table mode CTL1 CTL2 ③ H HiZ ④ L, HiZ H ⑤ H H SPIN > VC SPIN < VC Reverse-rotation braking mode (LRPM=L) Forward-rotation mode Short-circuit braking mode Reverse-rotation braking mode (LRPM=L) ③⑤Reverse-rotation braking mode (spindle) When SPIN < VC, all output are shorted to SPVM in 4500rpm (Typ.) or more, in less than 4500rpm (Typ.) the output become reverse-rotation braking mode. Rotation speed is less than 140rpm when SPIN < VC, all the output are shorted to SPVM. (However, the above-mentioned rotational speed is expressed in the case of 12pole motor.) ④ Short-circuit braking mode (spindle) All the spindle driver outputs are shorted to SPVM when SPIN < VC. 1-2.Spindle output mode The spindle output changes as follows by the setting of LRPM and SPIN. (CTL1=H,CTL2=H or HiZ) Rotation speed 0rpm 400rpm 4500rpm SPIN>VC 120°energizing 150°energizing Normal mode ⑥ LRPM=Low SPINVC 120°energizing SPIN