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Ordering number : EN4354
Monolithic Digital IC
LB1890M
FDD Spindle Motor Driver
Overview
The LB1890M is a 3-phase DD motor driver IC and is an ideal FDD spindle motor driver for 3.5 inch applications.
Package Dimensions
unit: mm 3129-MFP36S
[LB1890M]
Functions and Features
* Three phase total wave linear driver * Eliminates need for output electrolytic capacitor (however, depending on the motor, this may not apply) * On-chip digital speed control * Start/stop circuit * Current limiter circuit * On-chip index comparator (single HYS) * On-chip index delay circuit * 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 IO max1 IO max2 Pd max Topr Tstg Independent IC t0.5 Conditions Ratings 7.0 1.0 0.7 1 -20 to +80 -40 to +150 Unit V A A W C C
Allowable Operating Conditions at Ta = 25C
Parameter Supply voltage range Symbol VCC Conditions Ratings 4.2 to 6.5 Unit V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
73098HA (OT)/20593TS A8-9675, 9414 No. 4354-1/8
LB1890M Electrical Characteristics at Ta = 25C, VCC = 5V
Parameter Symbol ICCO1 ICC1 ISL VSLL VSLH IS/S1 VS/S1 VS/S1 IS/S2 VS/S2 VS/S2 IHB Vh Vdif Vho VH IHL Vsat1 Vsat2 IOL Vref1 GC v GC Vref2 Iib Vi+ Vi- Ii = -0.5 mA with reference of Vref2 Ii = 0.5 mA with reference of Vref2 0.75 -1.4 1000 VFG GFG VFG0 VFGB v Vsh1 v Vsh2 Vsh N VDL VDH IDI FD FOSC IIDB VID IIDO VIDL VIDH VDLDC VDLL VDLH TSD v TSD VID = 5V VID = 5V VID = 5V VID = 5V VID = 5V 4.5 150 180 40 4.5 2.50 0.4 1.5 5 10 ID = -0.5mA ID = 0.5mA VCC -0.4 1.0 1.0 1.0 10 VCC -0.5 15 0.4 "H" "L" "L" "H" 1 992 0.3 V V A MHz MHz A V A V V V V V C C *1 *1 *1 *1 2.20 2.50 25 25 VCC -1 Open loop 5 60 10 2.80 100 VCC/2 1 0.27 0.30 -6 1 IH = 5mA Stop IO = 0.35A, VCC = 4.2V IO = 0.70A, VCC = 4.2V 1.2 1.5 1.5 2.2 70 0 2.0 2.0 0 0 2.0 Conditions min Current drain Time changeover bias current Time changeover input voltage 1 Time changeover input voltage 2 S/S1 bias current S/S1 start voltage S/S1 stop voltage S/S2 bias current S/S2 start voltage S/S2 stop 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 (Sink plus source) Output leak current Current limiter Control amplifier voltage gain Voltage gain phase differential Integrated amplifier internal reference voltage Integrated amplifier bias current Integrated output voltage amplitude Gain band width FG amplifier input voltage FG amplifier voltage gain FG amplifier input offset FG amplifier internal reference voltage Schmitt hysteresis width Schmitt input operation level Speed disk recount number Disk recount out "L" level voltage Disk recount out "H" level voltage Disk recount out leak current Disk recount operation frequency Oscillation range Index bias current In-phase input voltage range Hysteresis setting current range Index output "L" level voltage Index output "H" level voltage Break-down voltage Delay output "L" level voltage Delay output "H" level voltage Excessive heat protected operating temperature Hysteresis width VCC = 5.0V (Stop) VCC = 5.0V (Steady) 20 Ratings typ max 0.2 30 0.4 0.8 VCC 0.4 VCC 0.8 0.1 0.8 VCC 20 VCC - 0.7 250 1.0 1.8 10 1.4 2.0 1.0 0.33 mA mA mA V V mA V V mA V V A V mVp-p mV V A V V mA V dB dB V A V V kHz mVp-p dB mV V mV mV V *1 *1 *1 *1 *2 *1 Unit Note
Note: *1) Marked values (*1) are guaranteed by the design itself and therefore do not require measurement. *2) When hall-effect input becomes larger, kick-back occurs to the output waveform and for this reason, 200 m Vp-p or less is recommended.
No. 4354-2/8
LB1890M
Pin Assignment
[Top view]
Block Diagram
Unit (resistance: , capacitance: F)
No. 4354-3/8
LB1890M
Pin Description
Unit (resistance: ) Pin No. 5 6 7 8 9 10 Symbol W- W+ V- V+ U- U+ Pin voltage 2.2V min VCC -0.7V max Equivalent circuit Pin description * W-phase hall-effect input pin. W+ > W- is established when logic is at an "H" level. * V-phase hall-effect input pin. V+ > V- is established when logic is at an "H" level. * U-phase hall-effect input pin. U+ > U- is established when logic is at an "H" level. * Minus pin for hall-effect bias. When stopped, switches open and halleffect bias severs.
11
HB
1.5V typ (IH = 5mA)
12
FC
* Frequency characteristics revision pin By installing a capacitor between this pin and GND, close-loop oscillation for the current control system halts. 1.5V min VCC -0.5V max * Index input pin. When the I+ pin is at an "L" level, I1 operates with the fixed current of I1 = 10 A and when at an "H" level, I1 does not flow. Hysteresis width is determined by the resistor attached externally to the I+ pin.
13 14
I+ I-
15
SL
"L": 0.8V max "H": 2.0V min
* Time changeover pin. 1 : 1.2 "L" level : "H" level
17
X1
* Reference clock generating pin.
18
X2
19
GND
* Ground pin. Grounded as with pins 1 and 36. Continued on next page. No. 4354-4/8
LB1890M
Continued from preceding page. Pin No. 20 ID Symbol Pin voltage "L": 0.4V max "H": 4.5V min (When VID equals 5 V) Unit (resistance: ) Equivalent circuit Pin description * Index pulse output pin.
21
DT1
* Pin connecting the external CR for the delay time constant circuit.
22
DT2
* Break-down current setting pin for the delay time constant circuit.
23
DTO
"L": 0.4V max "H": 4.5V min (When VID equals 5 V)
* Index delay pulse output pin.
24
FG0
* FG amplifier output pin.
25
FG-
* FG amplifier negative input pin.
26
FG+
2.48V (When VID equals 5 V)
* FG amplifier positive input pin. Generates reference voltage within IC.
27
S/S1
"L": 0.8V max "H": 2.0V min
* Start/stop changeover pin. "H" level active.
28
S/S2
"L": 0.8V max "H": 2.0V min
* Start/stop changeover pin. "L" level active.
Continued on next page. No. 4354-5/8
LB1890M
Continued from preceding page. Pin No. 29 Symbol DO Pin voltage Unit (resistance: ) Equivalent circuit Pin description * Speed discriminator output pin.
30
IAI
* Integrated amplifier input pin.
31
IAO
* Integrated amplifier output pin.
32
VID
* Index pulse output and index delay pulse output power supply pin. For applications when VCC equals 5 V, VCC = VID = 5 V.
33
VCC
* Total power supply voltage pin except for VID. Voltage must be stable and free of ripple and noise interference. * 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. * U-phase output pin.
34
Rf
35
UOUT
36 1 2 3 4
Pow GND Sub GND VOUT WOUT AGC
* Output transistor ground pin. * Ground pin. Grounded as with pins 19 and 36. * V-phase output pin. * W-phase output pin. * AGC pin. Controls hall-effect amplifier gain in response to hall-effect input frequency.
No. 4354-6/8
LB1890M
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, U+ > U- V+ > V- W+ > W-
Index and Timing Chart
When SL equals an "H" level, * T' 0.693CR6 * t' CR6R7 R6 + R7 R6 R7 { 0.405 + 1n (R6 --2R7) }
When SL equals an "L" level, * T' 0.577CR6 * t' CR6R7 R6 + R7
{ 0.522 + 1n ( 0.781R6 - R7 ) } R6 - 2R7
Using only the ID pulse involves shorting DT1 and DT2.
No. 4354-7/8
LB1890M
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. 4354-8/8

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