MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [FEATURES] PIN CONFIGURATION This IC is 1 chip driver IC for spindle motor and 5 channel actuators. All of the motor and actuator of optical disk drive system (CD-ROM etc.) can be drived by only this IC. This IC has a direct PWM control system for Spindle and Slide channels drive due to reducing IC power dissipation. This IC has three voltage supply terminals (for Spindle, Slide,Focus/Tracking and Loading) , and three voltage supply can be set separately. Further more this IC has short braking select function,FG amplifier, thermal shut down circuit, standby circuit, reverse rotation detect circuit. SL1IN SL2IN VM2 RSL2 SL2+ SL2GND 1 RSL1 SL1+ SL1GND W V U RSP HwHw+ HvHv+ HuHu+ 8 [APPLICATION] (Top View) 42 41 2 3 4 40 39 5 38 6 37 7 36 35 9 10 34 11 32 31 33 12 13 30 14 15 29 28 16 17 27 18 25 19 24 20 23 21 22 26 OSC MU1 LOIN+ VM3 BRS LOLO+ FOFO+ GND TO+ TO5VCC GND TOIN FOIN SPIN REF FG HB VM1 Package outline : 42 PIN POWER SSOP (42P9R-B) CD-ROM, DVD, DVD-ROM, DVD-RAM ,Optical disc related system,etc [BLOCK DIAGRAM] s FG FG s s s Reverse Detect HU+ HUHV+ HV- 120∫ MATRIX Logic Logic HW+ HWHall Bias Current comp. CTL amp. SPIN Direction comp. CTL amp. Current comp. CTL amp. Direction comp. Current comp. TSD Direction comp. BIAS REF Frequency generator SL1IN MU1 OSC SL2IN 5V power supply FOIN Regulator TOIN X12 X1 2 (1 / X8 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [PIN FUNCTION] TERMINAL SYMBOL TERMINAL FUNCTION TERMINAL SYMBOL 1 SL1IN Slide control voltage input 1 42 OSC PWM carrier oscilation set 2 SL2IN Slide control voltage input 2 41 MU1 mute 1 3 VM2 Motor Power Suppry 2(for Slide) 40 LOIN+ 4 RSL2 Slide current sense 2 39 VM3 Power Supply3 (for Loading) 5 SL2+ Slide non-inverted output 2 38 BRS Brake select control terminal 6 SL2- Slide inverted output 2 37 LO- Loading inverted output 7 GND GND 36 LO+ Loading non-inverted output 8 RSL1 Slide current sense 1 35 FO- Focus inverted output 9 SL1+ Slide non-inverted output 1 34 FO+ Focus non-inverted output 10 SL1- Slide inverted output 1 33 GND GND 11 GND GND 32 TO+ Tracking non-inverted output Tracking inverted output TERMINAL FUNCTION Loading control input(+) 12 W Motor drive output W 31 TO- 13 V Motor drive output V 30 5VCC 14 U Motor drive output U 29 GND GND 15 RSP Spindle current sensie 28 TOIN Tracking control voltage input 16 HW- HW- sensor amp. input 27 FOIN Focus control voltage input Spindle control voltage input 5V Power Supply(for FS ,TS) 17 HW+ HW+ sensor amp. input 26 SPIN 18 HV- HV- sensor amp. input 25 REF Reference voltage input 19 HV+ HV+ sensor amp. input 24 FG Frequency generator output HU- sensor amp. input 23 HB Bias for Hall Sensor HU+ sensor amp. input 22 VM1 20 HU- 21 HU+ (2 / 17) Motor Power Suppry 1(for Spindle) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [ABSOLUTE MAXIMUM RATING] SYMBOL 5VCC VM1 VM2 VM3 PARAMETER 5V power supply RATING Unit 7 V 15 V Focus and Tracking power supply Spindle power supply Motor power supply 2 Slide power supply 15 V Motor power supply 3 Loading power supply Focus,Tracking and Loading output current *note 1 15 V 1.0 A Spindle output current *note 1 1.2 A *note 1 0.5 A 0 to 5VCC V 2.6 W 20.8 mW / ºC Motor Output Current A IoB Motor Output Current B IoC Motor Output Current C Pt CONDITIONS Motor power supply 1 IoA Vin (Ta=25ºC ) Maximum input voltage of terminals Slide output current MU1,Hw-,Hw+,Hv,Hv+,Hu-,Hu+,REF,SPIN,BRS TOIN,FOIN,OSC,SLIN1,SLIN2,LOIN+ Power dissipation Free Air and on the grass epoxy board Kθ Thermal derating Free Air and on the grass epoxy board Tj Junction temperature 150 ºC Operating temperature -20 to +75 ºC Storage temperature -40 to +150 ºC Topr Tstg *note1 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation The spindle output terminal is needed external shottky diode between each output and GND when it is used above 0.6A. Discription(IoA) is case of with external shottky diode. [RECOMMENDED OPERATING CONDITIONS] (Ta=25ºC ) LIMITS SYMBOL VM1 VM2 VM3 PARAMETER minimum typical maximum Unit 6 12 13.2 V VM2 power supply(for Slide) 4.5 12 13.2 V VM3 power supply(for Loading) 4.5 12 13.2 V 4.5 5 7 V 0.5 0.8 A 0.5 1.0 A 0.25 0.4 A 120 KHz VM1 power supply (fot Spindle) 5VCC 5V power supply(for FS,TS) IoA Focus, Tracking and Loading Output Current IoB Spindle Output Current IoC Slide Output Current Fosc PWM carrier frequency *note 2 30 *note2 The spindle output terminal is needed external shottky diode between each output and GND when it is used above 0.6A. Discription(IoA) is case of with external shottky diode. ( 3 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [THERMAL DERATING] 6.0 (W) 5.0 This IC's package is POWER-SSOP, so improving the board on which the IC is mounted enables a large power dissipation without a heat sink. For example, using an 1 layer glass epoxy resin board, the IC's power dissipation is 2.6W at least. And it comes to 3.6W by using an improved 2 layer board. The information of the N, P type board is shown in attached. using N-type board 4.0 using P-type board 3.0 2.0 1.0 0 25 50 75 Ambient Temperature 100 125 150 Ta (ºC) [ELECTRICAL CHARACTERISTICS] Common (Ta=25ºC, 5VCC=VM3=5V,VM1=VM2=12V unless otherwise noted.) LIMITS SYMBOL Icc1 Icc2 PARAMETER Supply current Sleep current Fosc PWM carrier frequency VinREF REF input voltage range VMULO MUTE terminal low voltage VMUHI MUTE terminal high voltage Mute terminal input current BRSLO BRS terminal low voltage BRSHI BRS terminal high voltage IBRS MIN 5VCC,VM1, VM2 ,VM3 current 5VCC,VM1, VM2 ,VM3 current under Sleep (MU1 = 0V). BRS terminal input current VREF=1.65V Unit 60 78 mA 0 30 µA KHz 3.3 V -10 +10 µA 0.8 V 3.0 MU1 at 5V input voltage BRS V 500 µA 0.8 V 3.0 BRS BRS MAX 1.0 MU1 MU1 TYP 65 OSC : with 330pF REF input voltage range IinREF IMU CONDITIONS at 5V input voltage ( 4 / 17) V 430 µA REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [ELECTRICAL CHARACTERISTICS] Spindle (Ta=25ºC, 5VCC=VM3=5V,VM1=VM2=12V unless otherwise noted.) LIMITS SYMBOL Vdyc1 CONDITIONS PARAMETER Dynamic range of output Vdead1- Io=0.5 [A] MIN TYP 10.3 10.8 MAX Unit V SPIN<REF [REVERSE] -80 -40 0 mV REF<SPIN [FORWARD] 0 +40 +80 mV 5 V Control voltage dead zone 1 Vdead1+ Vin1 Gvo1 Vlim1F Vlim1R VHcom 0 Control voltage input range 1 SPIN Control gain 1 Control limit 1F Control limit 1R Hall sensor amp. common mode input range VHmin Gio1=Gvo1/ Rs [A/V] 0.85 1.0 1.15 V/V Ilim1F=Vlim1F/ Rs [A] 0.4 0.5 0.6 V Ilim1R=Vlim1R/ Rs [A] 0.22 0.28 0.34 V Hu+,Hu-,Hv+,Hv-,Hw+ ,Hw- 1.3 3.7 V Hu+,Hu-,Hv+,Hv-,Hw+ ,Hw- 60 at Load current (IHB)=10mA 0.6 Hall sensor amp.input signal level VHB IHB HB output voltage HB terminal sink current mVp-p 0.85 MU1=5V Slide 1,2 1.2 V 30 mA (Ta=25ºC, 5VCC=VM3=5V,VM1=VM2=12V unless otherwise noted.) LIMITS SYMBOL Vdyc2 CONDITIONS PARAMETER Dynamic range of output Vdead2- TYP at VM2=5[V] 3.3 3.8 at VM2=12[V] 10.3 10.8 -80 -40 0 mV REF < SL1IN ,SL2IN 0 +40 +80 mV SL1IN,SL2IN 0 5 V Io=0.5 [A] SL1IN,Sl2IN < REF MAX Unit MIN V Control voltage dead zone 2 Vdead2+ Vin2 Gvo2 Vlim2 Tdon Tdoff Tdsw Ileak Control voltage input range 2 Gio2=Gvo2/ Rs [A/V] 0.85 1.0 1.15 V/V Ilim2=Vlim2/ Rs [A] 0.43 0.5 0.58 V Output turn-on delay 1.0 2.0 µsec Output turn-off delay 2.0 3.5 µsec Output switching delay 3.0 6.0 µsec 100 µA Control gain 2 Control limit 2 Output leak current -100 MU1=5v ( 5 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [ELECTRICAL CHARACTERISTICS] Loading (Ta=25ºC, 5VCC=VM3=5V,VM1=VM2=12V unless otherwise noted.) LIMITS SYMBOL Vdyc3-1 PARAMETER Dynamic range of output Vdyc3-2 Dynamic range of output Vin3 Gvo3 Voff1 Control voltage input range3 Control gain 3 CONDITIONS Io=0.5[A] VM1=12[V] MIN TYP VM3=5[V] 3.9 4.2 VM3=12[V] 6.9 7.6 3.3 3.5 R=5.4[W] VM3=4.75V , VM1=12V V V 0 LOIN+ (LO+) - (LO-) (LOIN+) - (REF) (LO+) - (LO-) at LOIN+=REF=1.65V Output offset voltage Focus / Tracking Unit MAX 5 V 16.7 18.1 19.3 dB -50 0 +50 mV (Ta=25ºC, 5VCC=VM3=5V,VM1=VM2=12V unless otherwise noted.) LIMITS SYMBOL PARAMETER Vdyc4 Dynamic range of output Vin4 Gvo4 Voff2 Control voltage input range 4 CONDITIONS Io=0.5[A] VM1=12[V] FOIN,TOIN MIN TYP 3.8 4.2 (FO+) -(FO-) FOIN-REF (TO+) -(TO-) TOIN-REF Output offset voltage (FO+) -(FO-) at REF=FOIN=1.65V (TO+) -(TO-) at REF=TOIN=1.65V 20.2 -47 Unit V 5 V 21.6 22.8 dB 0 +47 mV 0 Control gain 4 MAX NOTE : This IC need condenser between each supply lines and GND for stoped Oscillation. [THERMAL CHARACTERISTICS] FUNCTION START TEMPERATURE OF IC SYMBOL Unit MIN TSD FUNCTION STOP TEMPERATURE OF IC PARAMETER Thermal Shut Down TYP MAX 160 MIN TYP 130 MAX ºC *note3 This TSD function start temperature doesn't show the guaranteed max. temperature of the devices. The guranteed max. temperature is Tj max. which is shown in "9. ABSOLUTE MAXIMUM RATING". The TSD function is a thermal protection in case the temperature of the devices goes up above Tjmax because of wrong use. And these TSD temperature are the target temperatures for circuit design, not the guranteed temperatures. (The TSD function of all the devices is not checked by a test in high temperature.) ( 6 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER Standby function Logic control MU1 Loading Slide1 SELECT2 H On On SELECT1 L/Open Off Off Drive Slide2 On Off channel Focus Tracking Spindle On On On Off Off Off This IC has MUTE terminal (MU1). It is possible to control ON / OFF of the channel by external logic inputs. In case of SELECT1, the bias of all circuit becomes OFF. Therefore, this mode is available in order to reduce the power dissipation when the waiting mode. In case of SELECT2,the bias of all channel becomes ON. Brake select function BRS Hi L / Open SPIN < REF Reverse Brake Short Brake REF < SPIN Forward Forward This IC has BRS terminal (BRS). It is possible for a braking timiming of Spindle drive to select which the short brake or the reverse brake by BRS. It shuould select the short brake in case of high speed system and please change to the reverse brake when the rotation speed becomes enough low. It is available when the SPIN voltage is low than the reference voltage. Loading channel The loading channel is the circuit of BTL voltage drive. This circuit has the referential input. Output swing is determined with ∆Vin x 8. Also,it is possible for this channel to use for the slide motor , the focus coil and the tracking coil. The input terminal is high impedance. It is possible to do variable a gain by external resistor. In case of one MCU port, if use three state port, it is possible for this channel to have the stop function. VM3 LO+ Forward LOIN+ + LOADING Channel Vo M LO- Reverse - REF ( 7 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER LO- Output voltage [V] LO+ + Coil - VM3 2 Vo [LOIN+] – [REF] (V) Coil Gvo = 8 [v/v] Vo=[LO+] – [LO-] =8 x ([LOIN+] – [REF]) LO- LO+ application.1 (MCU : One port H/Z/L control) Logic control Situation of loading channel P1 5v Forward rotation Z (Hi impedance) Short brake --> Stop 0 Reverse rotation 5v P1 Z Output voltage swing Vo= 8x(5[V]-REF[V]) xR2/(R1+R2) Vo= 0 [V] Vo= -8x(5[V]-REF[V]) xR2/(R1+R2) R1 P1 LOIN+ 0v R2 REF application.1 (One port H/Z/L control) ( 8 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER SPINDLE channel Forward Torque current limit The relationship between the differential voltage between SPIN and REF and the torque is shown in right Figure. The voltage gain[Gvo] is 1.0 [V/V]. The current gain[Gio] is 2.0[A/V] (at sensing resistor : 0.5 ohm,and R1=∞,R2=0ohm) in forward torque directions, and the dead zone is from 0mV to 80mV (at R1=∞,R2=0ohm) . The coil current gain under the reverse torque is the same with in forward torque directions.And the limitation function gets on when the differential voltage of VM1(12V) to RSP is 0.5V. Therefore current-gain-control and current-limit of this IC is determined with sensing resister value, and more detail control can be determined with setting a gain-resister outer this IC as below. lim1F Dead zone Gio CTL -REF (V) Gio Dead zone lim1R current limit Reverse Torque The example of current-gain and current-limit of SPINDLE. Rs [Ω] Gio* [A/V] Ilim1F Ilim1R [A] [A] R1=R2 R1=∞ R2=0 ohm R1=2 • R2 0.50 1.00 0.56 2.00 1.00 0.66 0.75 0.66 0.37 1.33 0.66 0.44 1.00 0.50 0.28 1.00 0.50 0.33 Gio*= R1 / [(R1+R2) • Rs] [A/V] VM1 5V Rh Rs RSP R2 SPIN CTL R1 1.65v REF HB HU+ HUHV+ HVHW+ HWU V W M GND (9 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER SLIDE channel The relationship between the differential voltage between SLIN and REF and the torque is shown in right Figure. The voltage gain[Gvo] is 1.0 [V/V]. The current gain is 2.0[A/V] (at sensing resistor : 0.5 ohm and R1=∞,R2=0ohm) in forward torque directions, and the dead zone is from 0mV to 80mV (at R1=∞,R2=0ohm)). The coil current gain under the reverse torque is the same with in forward torque directions.And the limitation function gets on when the differential voltage of VM2(12V) to RSL is 0.5V. Therefore current-gain-control and current-limit of this IC is determined with sensing resister value. Forward current limit Gio Dead zone SL*IN -REF (V) Dead zone Gio Reverse VM2 current limit VM2 Rs Rs RSL1 RSL2 Forward R2 SL2IN CTL M R1 REF 1.65v R2 SL1+ SL1IN CTL Forward M R1 1.65v SL1GND SL2+ REF SL2GND Reverse Reverse The example of current-gain and current-limit of SLIDE. Gio* [A/V] Rs [Ω] Ilim [A] 0.50 1.00 2.00 1.00 0.66 0.75 0.66 1.33 0.66 0.44 1.00 0.50 1.00 0.50 0.33 R1=∞ R2=0 ohm R1=R2 R1=2 • R2 Gio*= R1 / [(R1+R2) • Rs] [A/V] (10 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER FOCUS / TRACKING channel The focus and tracking channel is the voltage control drive using BTL . The focus and tracking is the same composition. The relationship between the differential voltage between FOIN and REF and the output voltage is shown in below Figure. The voltage gain [Gvo] is 5.0 [V/V]. R FOIN 6R FO- R REF Coil 6R R 5VCC R R FO+ R Output voltage [V] FO- FO+ + Coil - 5VCC 2 FOIN – REF (V) Vo Coil Gvo = 12 [v/v] Vo=[FO+] – [FO-] =12 x (FOIN – REF) FO- FO+ (11 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER Direct PWM operation The spindle and the slide channel is controlled by the direct PWM control. Also,built-in the current limit circuit. This IC controls the motor current directly. FORWARD Current path timing 1. FORWARD Current path timing 2. VM2 VM2 Rs Rs RSL RSL Current path 1 SL+ SL- M SL+ M SL- GND GND Current path 2 Current path 1 Control value Io=Vrs / Rs Current path 2 Control value Motor current carrier period Time ( 12 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER PWM carrier frequency setting PWM carrier frequency is decided by charging and discharging the capacitor that is connected to OSC terminal outer IC. Examination of the relationship the capacitor connected to OSC terminal and PWM carrier frequency is given in following table. Capacitor [pF] 820 750 330 220 180 130 110 Carrier Frequency [KHz] 28 30 65 90 110 140 160 *note) This PWM carrier frequency is TYP value. Recommendation of SHORT BRAKE MODE at SPINDLE DRIVE This IC has two brake mode, PWM-BRAKE-MODE and SHORT-BRAKE-MODE. In this IC recommendation, SHORTBRAKE-MODE is superior to PWM-BRAKE-MODE to reducing the power dissipation and to avoid braking down of this IC. (By excessive reverse torque current in braking a motor with PWM-BRAKE from high-speed-rotation with being excessive Back-EMF, this IC could be broken.) The relationship between hall-amplifier-input and output-current-commutation at SPINDLE DRIVE The relationship between the hall elements and the motor output current is shown in bellow Figure. Hw+ Hv+ Hu+ Hall input Hall elements Outer roter W U V V W + Output current V U W U U V V W REVERSE SPIN < REF 0 - U W V U FORWARD SPIN > REF W ( 13 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER FG function at SPINDLE DRIVE The FG terminal outputs the square pulse signal synchronizing with the Hall inputs [Hv+, Hv-] timing. And, the FG terminal is open-collector output. Phase delay circuit at SLIDE Phase delay circuit is built in the IC to detect an output spike current, when the motor current direction is switching. In switching the motor current direction, Phase delay circuit switch-off all output trangister of H-bridge for 3µsec. Output current setting at SLIDE In this IC, since output tranjister is NPN-type tranjister, motor coil current (Io) is larger than sensing resistance current about 10mA (TYP.) according to base current of output tranjister. Therefore please design output current with consisting these base current. ( 14 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER I/O circuit • FOIN, TOIN, SPIN LOIN+, OPIN- • Hu+, HuHv+, HvHw+, HwREF • MU1 5VCC 8K 5VCC 5VCC 2K 2K • OSC 2K 5VCC 10K 2K 30K • BRS 2K 8K 2K 2K 5VCC 4K 10K • HB • VM1, RSP, U, V, W • FG 5VCC 5VCC VM1 5VCC RSP U V W GND VM1 • 5VCC, VM3+, FO+, FO-, TO+, TO-, LO+, LO5VCC 9Vmax INSIDE REG VM3 LO+ LO- TO+ FO+ TO- FO- GND • VM2, RSL, SL1+, SL1-, SL2+, SL2VM2 RSL1 SL1+ RSL1 SL1- SL2+ SL2- GND ( 15 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [The boards for thermal derating evaluation] Board material 1st layer [TOP view] 2nd layer [BACK view] Glass-epoxy FR-4 Size 70x70mm N-type board thickness t=1.6mm [2 layer] 1 and 2 layers material : copper thickness : t=18µm O-type board [2 layer] P-type board [1 layer] POWER-SSOP 42P9R-B Heat sink Lead Chip mounted IC Evaluation board ( 16 / 17) REV990728 MITSUBISHI SEMICONDUCTORS Preliminary M63021FP SPINDLE MOTOR AND 5CH ACTUATOR DRIVER [APPLICATION CIRCUIT no.1] MCU R12 R11 5 to 12v Slide M SLIDE RSL2 RSL1 1 SL1IN OSC 42 2 MU1 41 LOIN+ 40 4 SL2IN VM2 RSL2 VM3 39 5 SL2+ 38 6 SL2- BRS LO- 7 GND LO+ 36 3 RSL1 FO- 35 9 SL1+ FO+ 34 10 SL1GND GND TO+ 33 11 12 W V TO- 31 5VCC GND 30 TOIN 28 13 RSP M 14 D/A REF R7 R8 5 to 12v Loading FS 32 Loading M 104 5V power Focus Tracking TS 5V 29 15 U RSP 16 HW- FOIN 27 17 HW+ SPIN 26 18 HV- REF 25 19 HV+ FG 24 20 HUHU+ HB 23 VM1 22 21 R9 C1 37 8 D/A R10 R5 R6 R3 R4 R2 R1 1.65v DSP 10K Rh 12v *Pull-up Resistance <Example> External Parts RSP RSL1,RSL2 Rh R1, R2, R3, R4, R5, R6 Typ 0.33 2 200 10K R7, R8 10K C1 330p R9, R10, R11, R12 10K D1, D2, D3 R13, R14, R15, R16 C2,C3,C4,C5 – 22 10n Unit Note Ω Ilim1F=1.5A, Ilim1R=1.0A, Gain=3.0A/V Ω Ilim=0.5A, Gain=1A/V Ω Ω This is difficult for your specification. Ω This is difficult for your specification. F Ω Fosc=65KHz V Ω Recommend VF<0.5V at IL=1.0A This is difficult for your specification. F ( 17 / 17) REV990728