View LB8500M_1086105.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ordering number : EN8336
Monolithic Digital IC
LB8500M
Overview
DC Fan Motor Speed Control IC
The LB8500M easily and simply implements feedback-based motor speed control in combination with a general-purpose motor driver IC. Compared to open-loop control, the use of speed feedback allows the motor speed precision to be improved and the speed fluctuations due to load variations to be minimized. * LB8500M : For use as a driver IC that increases the motor speed as the command voltage falls (single phase systems)
Features
* Achieves linear speed control Applications can set the slope of the change in motor speed with change in the input duty. * Minimized speed fluctuations in the presence of line or load variations * Allows a minimum speed to be set * Soft start function * Settings using external capacitors and resistors (to support easier mass production of end products) * Supports both PWM duty and analog voltage control inputs
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Supply voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IO max Pd max Topr Tstg VCC pin E0 pin When mounted on a circuit board *1 Conditions Ratings 18 3 0.87 -30 to +95 -55 to +150 Unit V mA W C C
*1 Specified circuit board : 114.3 x 76.1 x 1.6mm3, glass epoxy.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
32207 TI PC B8-8969 No.8336-1/15
LB8500M
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage range 1 Supply voltage range 2 Output current 6V constant voltage output current CTL pin voltage LIM pin voltage VCTL VLIM 0 to VREG 0 to VREG V V Symbol VCC1 VCC2 IO IREG VCC pin VCC pin, with VCC shorted to 6VREG E0 pin Conditions Ratings 7.5 to 17 5.5 to 6.5 2.5 -5 Unit V V mA mA
Electrical Characteristics at Ta = 25C, VCC = 12V
Parameter Supply current 6V constant voltage output (VREG pin) Output voltage Line regulation Load regulation Temperature coefficient Integrating Amplifier Block Common-mode input voltage range High-level output voltage Low-level output voltage FGIN pin High-level input voltage Low-level input voltage Input open voltage Hysteresis High-level input current Low-level input current RC pin High-level output voltage Low-level output voltage Clamp voltage CTL pin High-level input voltage Low-level input voltage Input open voltage High-level input current Low-level input current C pin High-level input voltage Low-level input voltage LIM pin Input bias current Common-mode input voltage range * The design specification items are design guarantees and are not measured. IB(LIM) VILIM -1 2.0 1 VREG A V VOH(C) VOL(C) VREG - 0.3 1.8 VREG - 0.1 2.0 VREG 0.01 2.2 V V VCTH VCTL VCTO ICTH ICTL VFGIN = 6VREG VFGIN = 0V 2.0 0 VREG - 0.5 -10 -140 0 -110 VREG 1.0 VREG 10 V V V A A VOH(RC) VOL(RC) VCLP(RC) 3.2 0.8 3.45 0.95 1.6 3.7 1.05 V V V VFGH VFGL VFGO VFGS IFGH IFGL VFGIN = 6VREG VFGIN = 0V 3.0 0 VREG - 0.5 0.2 -10 -140 0.25 0 -110 VREG 1.5 VREG 0.4 10 V V V V A A VOH VOL IEO = -0.2mA IEO = 0.2mA VREG - 1.2 VREG - 0.8 0.8 1.0 V V VICM 2.0 VREG V VREG VREG1 VREG2 VREG3 VCC = 8 to 17V IO = 0 to 5mA Design target* 5.8 6.0 40 50 0 6.2 100 100 V mV mV mV/C Symbol ICC Conditions min Ratings typ 4.5 max 6.5 mA Unit
No.8336-2/15
LB8500M
Package Dimensions
unit : mm (typ) 3086B
0.63 1.7max 4.4
0.15 (0.5) 5.0 10 6
1
5
0.35
1.0
0.1 (1.5)
SANYO : MFP10S(225mil)
Pin Assignment
EO 10 EI 9 GND 8 LIM 7 FGIN 6
6.4
LB8500M
1 RC
2 VREG
3 VCC
4 C
5 CTL Top view
Pin Functions
Pin 1 2 3 4 5 6 7 8 9 10 Pin No. RC VREG VCC C CTL FGIN LIM GND EI EO Description One-shot multivibrator pulse width setting. Connect a resistor between this pin and VREG, and a capacitor between this pin and ground. 6V regulator output. Connect a capacitor between this pin and ground for stabilization. Power supply. Connect a capacitor between this pin and ground for stabilization. Duty pulse signal smoothing and soft start time setting. Connect a capacitor between this pin and VREG. Duty pulse signal input. The speed is controlled by the duty of this pulse signal. FG pulse input Minimum speed setting. Normally, the 6V regulator level is resistor divided to set this pin's input level. Ground pin One-shot multivibrator output and integrating amplifier input. A capacitor must be connected between this pin and EO for this integration. Integrating amplifier output.
No.8336-3/15
LB8500M
Block Diagrams and Application Examples
When the FG signal is output to another circuit board Driver IC 12V C4 6VREG C5 FGIN EDGE FGIN VCC VREG
LB8500M
6VREG
FG
R3 RC C3 R1
One-shot multivibrator EI C2
LIM EO
VTH
C1
R2 C VREF
180k CTL signal CTL CTL
GND
No.8336-4/15
LB8500M
Speed Control Diagrams
The slope is determined by the external constant connected to the RC pin. (RPM) For a smaller RC time constant For a larger RC time constant
Speed
Minimum speed
Determined by the LIM pin voltage
0%
Low CTL pin (PWM DUTY) High EO pin voltage (V)
High Low
100% (V)
Set minimum speed Low on duty CTL pin
Variable speed
Full speed High on duty
6VREG LIM voltage EO pin EO voltage 0V
Startup Timing (soft start)
VCC pin
CTL pin
Stop
EO pin
Full speed Soft start The slope can be changed with the capacitor connected to the C pin (A larger capacitor increases the slope.) Full speed
Stop
No.8336-5/15
LB8500M
Supplementary Operational Descriptions The LB8500M accepts a duty pulse input and an FG signal from the driver IC, and generates the driver IC control voltage so that the FG period (motor speed) becomes proportional to the control voltage.
Driver IC
LB8500M
FGIN CTL signal CTL Closed feedback loop FG
EO
VTH
As shown in the figure below, the LB8500M generates a pulse signal from edges on the FG signal and then generates a pulse width waveform determined by the RC time constant in a one-shot multivibrator. The LB8500M then integrates that pulse waveform to create the output driver IC control voltage (a DC voltage).
FG
EDGE pulse
RC pin
Slope due to the RC time constant
One-shot multivibrator TRC(s) = 0.85RC
It is also possible to change the slope of the VCTL/speed relationship as shown in the speed control diagram in the previous section by changing the pulse width with the RC time constant. Note, however, that since pulses determined by this RC time constant are used, variation in the RC components will appear as speed control errors.
No.8336-6/15
LB8500M
Pin Setting Procedures (Provided for reference purposes) 1. RC pin The one-shot multivibrator pulse width can be calculated with the following equation. TRC(s) 0.85 x R x C..................................................... Equation 1 If the FG signal frequency at full motor speed is fFG (Hz) and the control duty desired for full speed is DUTY (for example: 50% 0.5), the values of the resistor and capacitor connected to the RC pin can be determined from the following equation. R x C = DUTY/(3 x 0.85 x fFG) ..................................... Equation 2 Note that if "rpm" is the full motor speed, since one revolution will be two FG periods, the following equation gives the FG frequency, fFG (Hz). fFG(Hz) = 2rpm/60 ......................................................... Equation 3 For reference purposes, the following table lists the RC pin external component values determined from equations 2 and 3 when the control duty at full speed will be 80% for a variety of full motor speed values. Note that the capacitor value must be in the range 0.01F to 0.015F due to the RC pin discharge capacity of the IC.
Full motor speed 10000rpm 8000rpm 6000rpm 4000rpm 2000rpm RxC 0.94 x 10-3 1.18 x 10-3 1.57 x 10-3 2.39 x 10-3 4.68 x 10-3 R 63k 78k 105k 157k 312k C 0.015F 0.015F 0.015F 0.015F 0.015F
The table below lists the RC pin external component values when the control duty for full motor speed is changed for a full motor speed of 10,000rpm.
Duty at full speed 80% (= 0.8) 60% (= 0.6) 40% (= 0.4) RxC 0.94 x 10-3 0.71 x 10-3 0.47 x 10-3 R 94k 71k 47k C 0.01F 0.01F 0.01F
Also, note that the FG frequency can be determined from the following equation for various control duty input states. fFG = DUTY/(3 x 0.85 x RC).......................................... Equation 4
2. C Pin Since a capacitor that can smooth the pin voltage is connected to the C pin, if the CTL pin input signal frequency is f (Hz), then the capacitor must meet the following condition. (Here, R is the IC internal resistance of 180k (typical).) 1/f = t < RC Note that the larger the capacitor, the longer the soft start time will be and its response to changes in the input signal will be slower.
6VREG CTL pin input inverted waveform (the frequency is the same) C pin 180k CTL pin CTL circuit VREF circuit A capacitor that can smooth the pin voltage is connected here. 1/f = t < CR
No.8336-7/15
LB8500M
3. LIM pin The LIM pin external component values can be derived as follows for the case where a motor whose maximum speed of 10,000rpm is to be achieved with an 80% duty, and a minimum speed of 3000rpm is to be set. Ra = minimum speed/full speed = 3000/10,000 = 0.3 Full-speed duty x Ra = 0.8 x 0.3 = 0.24 LIM pin voltage = 6 - (4 x 0.24) 5V From the above, the required LIM pin voltage is about 5V. To generate this 5V level by resistor dividing the 6 V regulator level, the resistor ratio will be 1:5, and the resistors connected to the LIM pin will have the following values. Between 6VREG and LIM pin : 10k Between LIM pin and GND : 50k
(RPM) 12000
10000
8000
6000
4000 Minimum speed 2000
0 0% 6V
20% 24%
40%
60%
80%
100%
5V
CTL Duty (PWM duty) LIM pin voltage
2V
No.8336-8/15
LB8500M
Application Example 2
[Used in Combination with the LB11660FV]
Driver IC 12V VCC VREG
LB8500M
6VREG EDGE FGIN FGIN FG
RC
One-shot multivibrator
EI
LIM
EO VREF VTH
C
CTL signal
CTL
180k
CTL
GND
In this circuit, the dynamic range of the LB8500M EO pin (the range from the amplifier block output high to output low levels) must be wider than the dynamic range (from the high to low levels of the PWM signal) of VTH pin of driver IC with which this IC is combined. However, since the LB11660FV PWM low-level voltage is lower than the LB8500M amplifier output low-level voltage, it must be resistor divided.
No.8336-9/15
LB8500M
Application Example 3
[Fixed Speed + Soft Start] With this circuit, the motor speed remains constant even if there are fluctuations in the supply voltage or static voltage.
(RPM) Motor full speed
0%
20%
40%
60%
80%
100%
6V
CTL signal (PWM duty) C pin voltage
Driver IC 12V VCC VREG 6VREG FGIN EDGE FG
LB8500M
FGIN
RC
One-shot multivibrator
EI
LIM
EO
VTH
C
VREF
180k CTL signal CTL CTL
GND
Input a fixed-duty signal to the CTL pin signal input as an input signal for which soft start is enabled at startup. Alternatively, apply a constant voltage to the C pin. (In this case, the CTL pin must be left open.)
No.8336-10/15
LB8500M
Application Example 4
[Analog Input] DC voltage speed control
(RPM) Motor full speed
Set minimum speed 0 6.0V 5.2V 4.4V 3.6V 2.8V 2.0V
C pin voltage
Driver IC 12V VCC VREG 6VREG FGIN EDGE FGIN FG
LB8500M
RC
One-shot multivibrator
EI
LIM
EO VREF
VTH
VCTL voltage
C
180k CTL CTL
GND
No.8336-11/15
LB8500M
Application Example 5
[Thermistor + Soft Start] Ambient temperature based speed control using a thermistor
(RPM) Motor full speed
C pin voltage change with the thermistor
Set minimum speed
Ambient temperature, Ta - C
Driver IC 12V VCC VREG 6VREG FGIN EDGE FGIN
LB8500M
FG
RC
One-shot multivibrator
EI
LIM
EO
VTH
C
VREF
180k CTL CTL
GND
No.8336-12/15
LB8500M
Application Example 6
[Thermistor + External PWM] Ambient temperature plus external PWM duty based speed control using a thermistor
(RPM) Motor full speed
:h
ig ty du PW M
Set minimum speed
h
Ambient temperature, Ta - C
PW M
du
ty
:l
ow
Driver IC 12V VCC VREG
LB8500M
6VREG FGIN EDGE FGIN FG
RC
One-shot multivibrator
EI
LIM
EO VREF
VTH
C
180k CTL CTL
GND
No.8336-13/15
LB8500M
Application Example 7
[Origin Shift] Changing the origin from 0rpm at 0% to a state where there is rotation at 0%
(RPM)
0%
20%
40%
60%
80%
100%
CTL signal (PWM duty)
Driver IC 12V VCC VREG
LB8500M
6VREG FGIN EDGE FGIN FG
RC
One-shot multivibrator
EI
LIM
EO
VTH
+ C
VREF
180k CTL signal CTL CTL
GND
No.8336-14/15
LB8500M
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above.
This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. PS No.8336-15/15

▲Up To Search▲

Price & Availability of LB8500M

	To Download LB8500M Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .