LB8500M SANYO | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 15

Technical content

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 = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage V CC max V CC pin 18 V Output current I O max E0 pin 3 mA Allowable power dissipation Pd max When mounted on a circuit board * 1 0.87 W Operating temperature Topr -30 to +95 °C Storage temperature Tstg -55 to +150 °C *1 Specified circuit board : 114.3 × 76.1 × 1.6mm3, glass epoxy. Monolithic Digital IC DC Fan Motor Speed Control IC

No.8336-2/15 Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage range 1 V CC1 V CC pin 7.5 to 17 V Supply voltage range 2 V CC2 V CC pin, with VCC shorted to 6VREG 5.5 to 6.5 V Output current I O E0 pin 2.5 mA 6V constant voltage output current IREG -5 mA CTL pin voltage V CTL 0 to VREG V LIM pin voltage V LIM 0 to VREG V Electrical Characteristics at Ta = 25°C, VCC = 12V Ratings Parameter Symbol Conditions min typ max Unit Supply current I CC 4.5 6.5 mA 6V constant voltage output (VREG pin) Output voltage VREG 5.8 6.0 6.2 V Line regulation ΔVREG1 V CC = 8 to 17V 40 100 mV Load regulation ΔVREG2 I O = 0 to 5mA 50 100 mV Temperature coefficient ΔVREG3 Design target * 0 mV/ °C Integrating Amplifier Block Common-mode input voltage range VICM 2.0 VREG V High-level output voltage V OH IEO = -0.2mA VREG - 1.2 VREG - 0.8 V Low-level output voltage V OL IEO = 0.2mA 0.8 1.0 V FGIN pin High-level input voltage VFGH 3.0 VREG V Low-level input voltage VFGL 0 1.5 V Input open voltage VFGO VREG - 0.5 VREG V Hysteresis VFGS 0.2 0.25 0.4 V High-level input current IFGH VFGIN = 6VREG -10 0 10 μA Low-level input current IFGL VFGIN = 0V -140 -110 μA RC pin High-level output voltage V OH(RC) 3.2 3.45 3.7 V Low-level output voltage V OL(RC) 0.8 0.95 1.05 V Clamp voltage V CLP(RC) 1.6 V CTL pin High-level input voltage VCTH 2.0 VREG V Low-level input voltage VCTL 0 1.0 V Input open voltage VCTO VREG - 0.5 VREG V High-level input current ICTH VFGIN = 6VREG -10 0 10 μA Low-level input current ICTL VFGIN = 0V -140 -110 μA C pin High-level input voltage V OH(C) VREG - 0.3 VREG - 0.1 VREG - 0.01 V Low-level input voltage V OL(C) 1.8 2.0 2.2 V LIM pin Input bias current IB(LIM) -1 1 μA Common-mode input voltage range VILIM 2.0 VREG V * The design specification items are design guarantees and are not measured.

No.8336-3/15 Package Dimensions unit : mm (typ) 3086B Pin Assignment Pin Functions Pin Pin No. Description 1 RC One-shot multivibrator pulse width setting. Connect a re sistor between this pin and VREG, and a capacitor between this pin and ground. 2 VREG 6V regulator output. Connect a capacitor between this pin and ground for stabilization. 3 V CC Power supply. Connect a capacitor between this pin and ground for stabilization. 4 C Duty pulse signal smoothing and soft start time setting. Connect a capacitor between this pin and VREG. 5 CTL Duty pulse signal input. The speed is controlled by the duty of this pulse signal.

6 FGIN FG pulse input

7 LIM Minimum speed setting. Normally, the 6V regulator level is resistor divided to set this pin's input level.

8 GND Ground pin

9 EI One-shot multivibrator output and integrating amplifier input. A capacitor must be connected between this pin and EO for this integration. 10 EO Integrating amplifier output. SANYO : MFP10S(225mil) (0.5) 1.7max 1.00.35 5.0 0.15 6.4 (1.5) 0.1 4.4 0.63 543 1 RC VREG VCC C CTL 10 9 8 7 6 EO EI GND LIM FGIN LB8500M Top view

No.8336-4/15 Block Diagrams and Application Examples LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC CTL signal VREF CTL 180kΩ When the FG signal is output to another circuit board 6VREG

No.8336-5/15 Speed Control Diagrams Startup Timing (soft start) Determined by the LIM pin voltage For a larger RC time constant For a smaller RC time constant The slope is determined by the external constant connected to the RC pin. (RPM) Speed Minimum speed Low← CTL pin (PWM DUTY) →High High← EO pin voltage (V) →Low 0% 100% (V) Variable speed Full speed 6VREG Low on duty High on duty Set minimum speed LIM voltage CTL pin EO pin EO voltage CTL pin Stop VCC pin EO pin Full speed Stop Full speed Soft start The slope can be changed with the capacitor connected to the C pin (A larger capacitor increases the slo pe.)

No.8336-6/15 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. 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). 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. LB8500M Driver IC FGIN FG VTH CTL CTL signal Closed feedback loop FG EDGE pulse RC pin One-shot multivibrator TRC(s) = 0.85RC Slope due to the RC time constant EO

No.8336-7/15 Pin Setting Procedures (Provided for reference purposes) 1. RC pin The one-shot multivibrator pulse width can be calculated with the following equation. 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. 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). 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 0.01µF to 0.015µF due to the RC pin discharge capacity of the IC. Full motor speed R × C R C 10000rpm 0.94 × 10-3 63k Ω 0.015 μF 8000rpm 1.18 × 10-3 78k Ω 0.015 μF 6000rpm 1.57 × 10-3 105k Ω 0.015 μF 4000rpm 2.39 × 10-3 157k Ω 0.015 μF 2000rpm 4.68 × 10-3 312k Ω 0.015 μF 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 R × C R C 80% (= 0.8) 0.94 × 10-3 94k Ω 0.01 μF 60% (= 0.6) 0.71 × 10-3 71k Ω 0.01 μF 40% (= 0.4) 0.47 × 10-3 47k Ω 0.01 μF Also, note that the FG frequency can be determined from the following equation for various control duty input states. 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 180kΩ (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. C pin VREF circuit 180kΩ CTL circuit CTL pin CTL pin input inverted waveform (the frequency is the same) A capacitor that can smooth the pin voltage is connected here. 1/f = t < CR 6VREG

No.8336-8/15 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 × Ra = 0.8 × 0.3 = 0.24 LIM pin voltage = 6 - (4 × 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 : 10kΩ Between LIM pin and GND : 50kΩ LIM pin voltage 10000 12000 8000 6000 4000 2000 6V 5V 2V Minimum speed CTL Duty (PWM duty) (RPM)

No.8336-9/15 Application Example 2 [Used in Combination with the LB11660FV] 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. LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC CTL signal VREF CTL 180kΩ

No.8336-10/15 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. CTL signal (PWM duty) C pin voltage (RPM) Motor full speed 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.) LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC CTL signal VREF CTL 180kΩ

No.8336-11/15 Application Example 4 [Analog Input] DC voltage speed control C pin voltage Set minimum speed (RPM) Motor full speed LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC VREF CTL VCTL voltage 180kΩ

No.8336-12/15 Application Example 5 [Thermistor + Soft Start] Ambient temperature based speed control using a thermistor (RPM) Motor full speed Set minimum speed Ambient temperature, Ta – °C C pin voltage change with the thermistor LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC VREF CTL 180kΩ

No.8336-13/15 Application Example 6 [Thermistor + External PWM] Ambient temperature plus external PWM duty based speed control using a thermistor (RPM) Motor full speed Set minimum speed Ambient temperature, Ta – °C PWM duty : high PWM duty : low LB8500M Driver IC 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC VREF CTL 180kΩ

No.8336-14/15 Application Example 7 [Origin Shift] Changing the origin from 0rpm at 0% to a state where there is rotation at 0% (RPM) CTL signal (PWM duty) Driver IC LB8500M 12V VCC 6VREG VREG EDGE FGIN FGIN EI EO FG VTH C GND One-shot multivibrator CTL LIM RC VREF CTL CTL signal 180kΩ

PS No.8336-15/15 SANYO Semiconductor Co.,Ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-qual ity 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 acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. When designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. Such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. 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 f or 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. Information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equi pment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. In the event that any or all SANYO Semiconductor C o.,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 in formation storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice.