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Ordering number: EN3519A
Monolithic Digital IC
LB1860,1860M,1861,1861M Variable Speed Fan Motor Driver
Overview
The LB1860 series ICs are drivers for two-phase unipolar drive DC brushless fan motors. They have functions such as driving, lock protection, restart and speed control.
Package Dimensions
unit: mm
3098B-DIP10S
[LB1860, 1861]
Features and Functions
. Two-speed mode select function requiring less external . . . . . .
component additions: Full speed and Low speed. Or, thermistor-controlled continuous variable-speed function according to ambient operation temperatures. Motor starts rotating at a low speed. Motor lock protection and automatic return circuit built in Output transistors: Output current IO = 1.5 A, output circuit protection Zener diodes (LB1860: M-Vz = 57 V/ LB1861: M-Vz = 32 V) Enables low-level noise protection with chip capacitor. Built-in thermal shutdown circuit Built-in rotation detect function (Drive mode: ``L'', Stop mode: ``H'') The LB1860 series can be operated from either 12 V or 24 V power supply by changing an external resistor. (Strong protection against power supply surge) Connectable direct to a Hall element
SANYO : DIP10S unit: mm
3111-MFP14S
[LB1860M, 1861M]
SANYO : MFP14S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73096HA(II)/4060TA,TS No.3519-1/6
LB1860,1860M,1861,1861M
Specifications
Absolute Maximum Ratings at Ta = 25 C, ( ): LB1860M, LB1861M
Parameter Maximum input current Output supply voltage Output current RD flow-in current RD supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol ICC max VOUT IOUT IRD VRD Pd1 max Pd2 max Topr Tstg Mounted on 20 x 15 x 1.5 mm glass epoxy board t % 20 ms Conditions Ratings 200 Internal 1.5 10 50 1.1 (0.8) -30 to +80 -55 to +125 Unit mA V A mA V W W C C
Allowable Operating Ranges at Ta = 25 C
Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 6.0 to 50 0 to VIN -1.5 Unit mA V
Electrical Characteristics at Ta = 25 C, ICC = 10 mA
Parameter Output limiting voltage Symbol VOLM1 VO sat1 VO sat2 VO sat3 VIN VOFF IBA VRD (sat) IC1 IC2 VTH1 VTH2 Vct IRT VRT TSD TSD Conditions LB1860, 1860M: IO = 0.1 A LB1861, 1861M: IO = 0.1 A IO = 0.5 A IO = 1.0 A IO = 1.5 A ICC = 7.0 mA min 54 30 typ 57 32 0.95 1.15 1.4 6.7 0 max 60 34 1.2 1.5 2.0 7.0 7.0 Unit V V V V V V mV nA V A A V V V A V C C
Output saturation voltage Input voltage Amp input offset voltage Amp input bias current RD output saturation voltage C flow-out current C discharge current Comparator input threshold voltage Ct discharge voltage Rt input current Rt comparator voltage Thermal protection circuit operating voltage Thermal protection circuit hysteresis
6.4 -7.0 -250
IRD = 5 mA C = GND C = VIN 2.7 0.35 0.77 0.44 0.18 -440 0.59
0.15 3.9 0.50 0.8 VIN 0.47 VIN 0.2 VIN -350 0.62 VIN 180 40
0.3 5.0 0.65 0.83 0.50 0.22 -240 0.65
VRT = GND RT = OPEN Design target Design target
Pin Assignments
Top view
Top view
No.3519-2/6
LB1860,1860M,1861,1861M
Block Diagram and Application Circuit
Constant current circuit
0.47 to 10
Output timing control
(
): MFP14S Figure 1
Unit (resistance: , capacitance: F)
Truth Table
( ): LB1860M, 1861M
IN+ H L (H) (L) -- -- IN- L H (L) (H) -- -- Ct H H -- -- L -- Rt1 L L -- -- H -- Rt2 -- -- (H) (H) L -- CR L L (L) (L) L H OUT1 H L (H) (L) H H OUT2 L H (L) (H) H H RD L L (L) (L) L H Mode Full speed Full speed (Full speed) (Full speed) Low speed Lock protection
Designer's Notes
(1) Variable-speed circuit (Rt and Ct pins) -- Refer to the application circuit diagram The time constant gained by external components C2 and R2 is used to set the length of an `off' operation time period after phase switching. This means that the variable-speed operations can be performed by changing the `on' operation time of each phase through the duty control. The sawtooth waveform signals are generated by the C2-R2 time constant. The voltage of this signal (Ct pin voltage) increases from 1.3 V to 4.0 V (Vct) at each phase switching. That is, during this period, the driver becomes inactive (toff), in which output circuit is turned off. If VCC ^ 4.0 V, the driver IC remains active (ton) until the next phase switching. During this period, output circuit is turned on. If the active drive time of each phase is assumed to `to', the following relation can be established:
. . . .
to
=
toff
+
ton Rotation speed proportional constant
Fixed constant
toff = 0.69 c C2 c R2 ........................................ 1 No.3519-3/6
LB1860,1860M,1861,1861M
. From this relation, it can be observed that the `t ' and `t .
o on' are in proportional relation with each other, and that the `ton/to' equals the `on' time duty. As a result, a certain rotation speed can be fixed despite the fact that rotation speed exclusively depends on each motor. At the start, the `ton' value becomes longer while the `toff' value remains unchanged. This means that the `toff/to' duty becomes small enough compared to normal rotation mode. Therefore, the same start torque as that of the full speed rotation can be obtained because the `on' operation time duty increases. This enables the motor to start at a very low speed. IN
(2) Supply voltage (V pin) . The LB1860 has the internal parallel regulator which supplies power to the Hall amplifier circuit and the control block.
. . .
Therefore, the driver ICs are not affected by power source fluctuations and kickbacks from the motor. They maintain the stable operations even if noise signals such as surge are generated. Set the resistance R1 between VCC and VIN so that the ICC current of 6 mA to 50 mA can flow onto the VIN pin within the supply voltage range of a fan motor. VIN is 6.7 V typ at ICC = 7 mA. The current flowing into VIN is calculated using the equation shown below. ICC = VCC - VIN R1 ............................ 2
. Consideration given to surge voltage . The maximum allowable current at V
Vsurge
-
IN
pin is 200 mA. Therefore, the pin is designed to withstand abnormal positive voltage of: VIN + R1 x 200 mA ............................................ 3
=
+
(3) voltage (Pins IN IN ) . SetHall input pinlevels of the input ,pin for the Hall element output and the Hall element output voltage to within the range of the voltage - 1.5 . 0 V to V betweenV.the hall input pin and the output pin is 100 dB or greater. The offset voltage of the hall input amp is 7 mV, The gain
IN
therefore, the hall element output must be set with the offset voltage (7 mV) considered. (4) Output transistor (Pins OUT1, OUT2) Output current IO = 1.5 A max Output saturation voltage VO sat = 1.15 V/1.0 A typ Output limiting voltage VOLM = 57 V typ (LB1860, 1860M) VOLM = 32 V typ (LB1861,1861M) Since the LB1860 series have a protect zener diode between collector and base, the kickback voltage induced by the coil is cut at VOLM = 57 V (32 V). When external capacitors are connected between OUT and GND, the capacitance should not exceed 10 F.
. . . . . .
(5) Output protection function (C pin) Capacitor pin used in forming an automatic return circuit. If rotation is stopped due to overload, the pin voltage level increases and then forces the output to become inactive. In this case, after proper load adjustment, the output returns to the `drive' mode from the `stop' mode automatically. By changing the capacitor value, the lock detect time period can be set. For C marked with 1 F Lock detect time Lock protect time (output ON) (output OFF) Approximately 2 sec. Approximately 1 sec. Approximately 6 sec.
Rotation
Output ON Lock
Output OFF
Output ON
Output OFF
Lock release
Rotation
Automatic Return Circuit C Pin Voltage
No.3519-4/6
LB1860,1860M,1861,1861M
1 When a fan is rotating, the capacitor is charged at 4 A (typ) and discharged through the C with pulses according to the rotational speed. 2 When a fan is locked, no discharge occurs through the C and the C voltage rises, turning OFF the output at 0.8 x VIN. 3 When the output is turned OFF, discharge occurs through the C at 0.5 A (typ). If the lock is not released when the C voltage drops to VTH2, the capacitor is charged to VTH1 again. (At this moment, the output is turned ON.) These operations 2 and 3 repeated at a cycle of approximately ton : toff = 1:6 protect a motor. 4 If the lock is released when the C voltage drops to VTH2, the output is turned ON, starting rotation. (6) Rotation detect signal (RD pin) . Open collector output (Drive mode: ``L'', Stop mode: ``H'') (7) Radio noise reducing (Pins B1, B2) Base pin of Darlington connection output transistor If radio noises need to be processed properly, the following actions should be taken: 1 Connect a capacitor of 0.01 to 0.1 F between B1 and B2. 2 Connect a capacitor of 0.001 to 0.01 F between OUT and B. If output causes oscillation, add a resistor of 200 to 1 k in series with a capacitor.
. . .
(8) Thermal shutdown function Shutdown the driver output in case of coil short-circuiting and abnormal IC heating.
Thermistor-controlled Application Circuit Example
Use of a thermistor enables motor speed to be sensitive to the operating ambient temperature. The Rt pin voltage at Ta = 20 C has 1.42 ms of `toff' as calculated in expression 4 with the application constant of Figure 2. However, the Rt pin voltage at Ta = 40 C is reduced into less than the Vct (= 1.3 V) level, which results in a 0 of `toff'. This means the 100% duty. t = -C2 c R2 c 1n Figure 2 (VIN - VRt) ............. 4 VIN - VCt
Noise elimination capacitor
(
): MFP14S
Unit (resistance: , capacitance: F)
Output Timing Chart
Hall input
Discharge pulse
Ct voltage
Output `off' signal
OUT1 current All-phase ON waveform OUT2 current Control output waveform Figure 3 No.3519-5/6
LB1860,1860M,1861,1861M
Top Speed
Number of rotation, n - rpm
Ambient temperature, Ta - C
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. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 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: 2 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. 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, 1996. Specifications and information herein are subject to change without notice.
No.3519-6/6

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