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Ordering number : EN4355
Monolithic Digital IC
LB1817M
FDD Spindle Motor Driver
Overview
The LB1817M is the ideal IC for applications requiring a 5 V, low-profile FDD spindle motor driver.
Package Dimensions
unit: mm 3129-MFP36S
[LB1817M]
Functions and Features
* * * * * * * * * * Three phase total wave linear driver (external PNP) Low saturation voltage On-chip digital speed control Start/stop circuit ("L" level active) Rotation speed switching Current limiter circuit On-chip index processing circuit Index timing supports adjustments using VR AGC circuit Temperature protection circuit
SANYO: MFP36S
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Maximum output current Steady maximum output current Allowable power dissipation Operating temperature Storage temperature range Symbol VCC max ICC max1 IO max2 Pd max Topr Tstg Independent IC t0.5 Conditions Ratings 7.0 1.5 1.0 1 -20 to +80 -40 to +150 Unit V A A W C C
Allowable Operating Conditions at Ta = 25C
Parameter Supply voltage Symbol VCC Conditions Ratings 4.2 to 6.5 Unit V
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73098HA (OT)/20593TS A8-9155 No. 4355-1/9
LB1817M Electrical Characteristics at Ta = 25C, VCC = 5V
Parameter Symbol ICCO ICC IMS1 VMS1L VMS1H IMS2 VMS2L VMS2H IMS3 VMS3L VMS3H IS/S VS/SL VS/SH IHB Vh Vdif Vho VH IHL Vsat IOL Ilim GC v GC I+ I- I+/I- IDSC VFG GFG VFGO VFGB v Vsh1 v Vsh2 N FD FOSC v FOSC VIDL IIDL VI VDIF IHYS VTH VTL THL VREF1 VREF2 TSD v TSD MS1 = L MS1 = L VTH (MS1 = L)/VTH (MS1 = H) 2.20 1.85 150 Hysteresis width<25mA 0.2 25 2.9 1.15 0.4 4.2 1.26 0.52 1.148 2.50 2.15 180 10 2.80 2.45 V V C C * * IO = 2mA "H" "L" "L" "H" 2.2 2.5 25 25 1390/2 1.1 1.1 0.2 0.4 10 VCC -0.7 100 5.5 1.35 0.6 MHz MHz % V A V mV A V V * * fFG = 300Hz Open loop 2 60 10 2.8 19 -19 0.8 28 -28 1.0 RF = 3k, ROUT = 100 6.3 -7.5 7.5 -5.5 IH = 5mA S/S = 5V IO = 0.8A 0.45 0.5 0.8 2.0 50 0 2.0 VMS3 = 5V 0 2.0 VMS2 = 5V 0 2.0 90 Conditions min Current drain MS1 bias current MS1 "L" level input voltage MS1 "H" level input voltage MS2 bias current MS2 "L" level input voltage MS2 "H" level input voltage MS3 bias current MS3 "L" level input voltage MS3 "H" level input voltage S/S bias current S/S "L" level voltage S/S "H" level voltage Hall-effect bias amplifier input current In-phase input voltage range Differential input voltage range Input offset voltage Hall-effect output voltage Leak current Output saturation voltage Output leak current Current limiter Control amplifier voltage gain Voltage gain phase differential V/I conversion source current V/I conversion sink current V/I conversion current ratio DSC buffer input current FG amplifier input voltage FG amplifier voltage gain FG amplifier input offset FG amplifier internal reference voltage FG schmitt hysteresis width Speed disk recount number Disk operation frequency Oscillation range Oscillation frequency error Index output "L" level voltage Index output leak current Index amplifier in-phase input voltage range Index amplifier differential input voltage range Index amplifier hysteresis setting current Timing adjustment "H" level Timing adjustment "L" level Timing adjustment ratio Reference voltage Excessive heat protected operating temperature Hysteresis width S/S = 5V (Standby) S/S = 0V (Steady) VMS1 = 5V 0 2.0 90 Ratings typ 70 25 180 max 100 35 270 0.8 VCC 135 0.8 VCC 135 0.8 VCC 20 0.8 VCC 15 VCC - 0.7 200 10 1.1 10 0.64 1.0 8.7 -3.5 1 37 -37 1.2 1.0 20 A mVp-p dB mV V mV mV * * * * A mA A V V A V V A V V A V V A V mVp-p mV V A V mA mA dB dB A A * Unit Note
Note: Marked values (*) are guaranteed by the design itself and therefore do not require measurement.
No. 4355-2/9
LB1817M
Pin Assignment
[Top view]
Block Diagram
Unit (resistance: , capacitance: F)
No. 4355-3/9
LB1817M
Pin Description
Unit (resistance: ) Pin No. 1 Symbol VCC Pin voltage Equivalent circuit Pin description * Power supply voltage pin. Voltage must be stable and free of ripple noise interference. * AGC pin. Controls hall-effect amplifier gain in response to hall-effect input frequency. External capacitor installation.
2
AGC
3
DSC out
* Speed discriminator pin.
4
CT
* Timing adjustment pin. External CR for delay time constant connected.
5
Vref1
2.5V typ
* Vref1 pin. Used as external CR power supply for index timing adjustment applications.
6
Vref2
2.15V typ
* Vref2 pin. Used for sensor bias for external index applications.
Continued on next page. No. 4355-4/9
LB1817M
Continued from preceding page. Pin No. 7 Symbol I/D Pin voltage Unit (resistance: ) Equivalent circuit Pin description * Index pulse output pin.
8 9 10
NC GND MS3 H: 2.0V min L: 0.8V max
* No connection. * Ground pin for signal system. Grounded as with pin 20. * FG changeover pin. When operating at an "H" level, FG sets to a through state. An "L" level results in 1step division of FG.
11
MS2
H: 2.0V min L: 0.8V max
* CLK changeover pin. When operating at an "H" level, CLK sets to a through state. An "L" level results in 1-step division of CLK.
12
MS1
H: 2.0V min L: 0.8V max
* Rotation speed changeover pin. An "H" level sets rotation speed to 360 rpm. An "L" level sets rotation speed to 300 rpm. For more details, refer to the rotation speed changeover table.
13
S/S
H: 2.0V min L: 0.8V max
* Start/stop changeover pin. "L" level active.
Continued on next page. No. 4355-5/9
LB1817M
Continued from preceding page. Pin No. 14 15 I- I+ Symbol Pin voltage Unit (resistance: ) Equivalent circuit Pin description * External index negative input pin. * External index positive input pin. When the I- pin is at an "H" level, I1 operates with the fixed current; at an "L" level, I1 does not flow. Hysteresis width is determined by the resistor attached externally to the I- pin.
16
X1
* Reference clock generating pin.
17
X2
18
FC
* Frequency characteristics revision pin By installing a capacitor between this pin and VCC, close-loop oscillation for the current control system halts.
19
RF
* Output current detection pin. By installing an Rf resistor between this pin and VCC, output current is detected as voltage. Voltage detection at this pin activates the current limiter. Detection level is approximately 1/50 of output current. * Output transistor grounding pin. Grounded as with pin 9.
20
PGND
Continued on next page. No. 4355-6/9
LB1817M
Continued from preceding page. Pin No. 21 22 Symbol FG+ FG- Pin voltage 2.5V typ Unit (resistance: ) Equivalent circuit Pin description * FG amplifier positive pin. * FG amplifier negative pin.
23
FG out
* FG amplifier output pin.
24 25 26 27 28 29
UOUT UPB VOUT VPB WOUT WPB
* U-phase output pin. * Base connection pin for U-phase external PNP. * V-phase output pin. * Base connection pin for V-phase external PNP. * W-phase output pin. * Base connection pin for W-phase external PNP. * U-phase hall-effect input pin. UIN1 > UIN2 is established when logic is at an "H" level. * V-phase hall-effect input pin. VIN1 > VIN2 is established when logic is at an "H" level. * W-phase hall-effect input pin. WIN1 > WIN2 is established when logic is at an "H" level.
30 31 32 33 34 35
UIN2 UIN1 VIN2 VIN1 WIN2 WIN1
36
HB
* Hall-effect bias applied to minus-side pin. When stopped, switches open and halleffect bias severs.
No. 4355-7/9
LB1817M
Truth Table
Source Sink 1 2 3 4 5 6 V-phase W-phase V-phase U-phase W-phase U-phase W-phase V-phase U-phase V-phase U-phase W-phase Hall-Effect Input U H L L L H H V H H H L L L W L L H H H L
When an "H" level exists for hall-effect input, UIN1 > UIN2 VIN1 > VIN2 WIN1 > WIN2
Rotation Speed Changeover Table
fOSC = 1MHz
MS1 MS2 MS3 fFG [Hz] 720 H H H 600 720 L H L L 600 L H H L 1440 1200 360 L H L H 300 L
Index and Timing Chart
No. 4355-8/9
LB1817M
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1998. Specifications and information herein are subject to change without notice. PS No. 4355-9/9

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