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PDF LB8503V Data sheet ( Hoja de datos )
| Número de pieza | LB8503V | |
| Descripción | DC Fan Motor Speed Control IC | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA0366
LB8503V
Monolithic Digital IC
DC Fan Motor Speed
Control IC
http://onsemi.com
Overview
The LB8503V is an improved functionality version of the LB8500 and LB8502 products that features the added
functions listed below. The LB8503V supports both single-phase and three-phase applications.
Added Functions
• Supports origin shifting in the speed control function
• Adds a dedicated pin for setting the soft start time
This allows a longer start time to be set without reducing the response time when changing speed.
• FG output pin added
Functions and 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
Semiconductor Components Industries, LLC, 2013
May, 2013
31407 TI PC 20060207-S00003 No.A0366-1/20
1 page  
LB8503V
Block Diagrams and Application Examples
Combination with an accelerating driver IC when the command voltage goes low (single-phase systems)
12V
C4
C5
R3
C3
R1
C6
R2
C1
R4
R5
CTL
signal
LB8503V
VREG
VCC
6VREG
EDGE
One-shot
RC multivibrator
FGOUT
VREG
FG
FGIN
LIM
SOFT
CVI
CVO
VREF
VREG
EI
C2
EO1
C
CTL
CTL
GND
EO3
FG
VTH
I LB01769
No.A0366-5/20
5 Page 
LB8503V
2. Y axis shift (Resistor dividing the CVO to VCC potential)
(RPM)
Motor
full speed
X axis shift
0%
CTL Duty (%)
100%
To shift the characteristics from a 0% = 0 rpm origin to a situation where the speed is 0 rpm at a duty of 30%:
First, determine the required CVO pin input voltage at 0%.
CVO = 6 - (4 × DUTY) = 6 - (4 × 0.25) = 6 - 1 = 5V
Determine the resistor values such that at CVO = 5 V, CVI becomes 6V.
CVO - CVI : CVI - VCC = 1 V : 6V = a ratio of 1:6.
From the above, the desired resistor values will be 20kΩ between CVO and CVI and 80kΩ between CVI and ground.
(Due to the current capability of the CVO pin, the total resistor value must exceed 100kΩ.)
Note that the slope will change. (In this case, since the resistor ratio is 1:6, the result will be 6/7 of (or 0.86 times) the
original slope.)
If required, the RC pin resistor value must be changed to correct the slope.
VCC
R5
R4
LIM
SOFT
CVI
CVO
VREF
C
CTL
CTL
ILB01775
No.A0366-11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LB8503V.PDF ] | |
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