ENA0366 D

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
LB8503V
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Supply voltage
VCC max
Output current
IO max
Conditions
Ratings
Unit
VCC pin
E0 pin
18
V
3
mA
FG output pin output voltage
VFG max
FGOUT pin
18
V
FG output pin output current
IFG max
FGOUT pin
10
mA
Allowable power dissipation
Pd max
When mounted on a circuit board *1
0.8
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.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Allowable Operating Range at Ta = 25°C
Parameter
Symbol
Conditions
Supply voltage range 1
VCC1
VCC pin
Supply voltage range 2
VCC2
VCC pin, with VCC shorted to 6VREG
Output current
Unit
7.5 to 17
V
5.5 to 6.5
V
2.5
mA
IREG
-5
mA
CTL pin voltage
VCTL
0 to 6VREG
V
LIM pin voltage
VLIM
0 to 6VREG
V
VC1 pin voltage
VCI
0 to 6VREG
V
6V constant voltage output
IO
Ratings
E0 pin
current
Electrical Characteristics at Ta = 25°C, VCC = 12V
Parameter
Symbol
Ratings
Conditions
min
Supply current
Unit
typ
ICC
max
5.5
6.5
mA
6V constant voltage output (VREG pin)
Output voltage
VREG
6.0
6.2
V
Line regulation
ΔVREG1
VCC = 8 to 17V
5.8
40
100
mV
Load regulation
ΔVREG2
IO = -5 to 5mA
10
100
mV
Temperature coefficient
ΔVREG3
Design target*
0
mV/°C
Integrating Amplifier Block (E01)
Common-mode input voltage
VICM
2.0
VREG
V
range
High-level output voltage
VOH(E01)
IEO1 = -0.2mA
Low-level output voltage
VOL(E01)
IEO1 = 0.2mA
VREG - 1.2
V
VREG - 0.8
0.8
1.0
V
Integrating Amplifier Block (E03)
High-level output voltage
VOH(E03)
IEO1 = -0.2mA
Low-level output voltage
VOL(E03)
IEO1 = 0.2mA
VREG - 1.2
V
VREG - 0.8
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
High-level input current
IFGH
VFGIN = 6VREG
Low-level input current
IFGL
VFGIN = 0V
0.2
0.3
0.4
V
-10
0
10
μA
-140
-110
μA
FGOUT pin
Output low saturation voltage
VFG
Output leakage current
IFGL
0.2
0.3
V
10
μA
Continued on next page.
No.A0366-2/20
LB8503V
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
Unit
typ
max
RC pin
High-level output voltage
Low-level output voltage
Clamp voltage
VOH(RC)
3.2
3.45
3.7
V
VOL(RC)
0.8
0.95
1.05
V
VCLP(RC)
1.5
1.65
1.8
V
VCTH
2.0
VREG
V
V
CTL pin
High-level input voltage
Low-level input voltage
VCTL
0
1.0
Input open voltage
VCTO
VREG - 0.5
VREG
V
High-level input current
ICTH
VFGIN = 6VREG
10
μA
Low-level input current
ICTL
VFGIN = 0V
-10
0
-140
-110
μA
C pin
High-level input voltage
VOH(C)
VREG - 0.3
VREG - 0.1
Low-level input voltage
VOL(C)
1.8
2.0
IB(LIM)
V
2.2
V
-1
1
μA
2.0
VREG
V
LIM pin
Input bias current
Common-mode input voltage
VILIM
range
SOFT pin
Charge current
IC(SOFT)
Operation voltage range
μA
1.4
VISOFT
2.0
VREG
V
IB(VCI)
-1
1
μA
2.0
VREG
V
VCI pin
Input bias current
Common-mode input voltage
VIVCI
range
VCO pin
High-level output voltage
VOH(VCO)
VREG - 0.2
V
Low-level output voltage
VOL(VCO)
2.0
V
* The design specification items are design guarantees and are not measured.
Package Dimensions
unit : mm (typ)
3178B
Pd max – Ta
5.2
0.5
6.4
9
4.4
16
1
8
0.65
0.15
1.5max
0.22
Specified circuit board : 114.3×76.2×1.6mm3
glass epoxy board
0.8
0.6
0.4
0.2
0
– 20
0
20
40
60
80
100
Ambient temperature, Ta – °C
0.1 (1.3)
(0.33)
Allowable power dissipation, Pd max – W
1.0
SANYO : SSOP16(225mil)
No.A0366-3/20
LB8503V
Pin Assignment
EO3
EO1
EI
NC
GND
FGOUT
FGIN
LIM
16
15
14
13
12
11
10
9
LB8503V
1
2
3
4
5
6
7
8
RC
SOFT
VREG
VCC
CVI
CVO
CTL
C
Top view
Pin Functions
Pin No.
Pin
Description
RC
1
One-shot multivibrator pulse width setting. Connect a resistor between this pin and VREG, and a capacitor between this
SOFT
2
pin and ground.
Soft start time setting. Connect a capacitor between this pin and VREG.
VREG
3
6V regulator output. Connect a capacitor between this pin and ground for stabilization.
VCC
4
Power supply. Connect a capacitor between this pin and ground for stabilization.
CVI
5
Control voltage input
CVO
6
Duty pulse signal smoothed voltage output
CTL
7
Duty pulse signal input. The speed is controlled by the duty of this pulse signal.
C
8
Duty pulse signal smoothing. Connect a capacitor between this pin and VREG.
LIM
9
Minimum speed setting. Normally, the 6V regulator level is resistor divided to set this pin's input level.
FGIN
10
FG pulse input
FGOUT
11
FG pulse output
GND
12
Grand pin
NC
13
NC pin
EI
14
One-shot multivibrator output and integrating amplifier input. A capacitor must be connected between this pin and EO for
EO1
15
this integration.
Integrating amplifier output. (For use with an accelerating driver IC if the command voltage becomes low (single-phase
systems).)
EO3
16
Integrating amplifier inverting output. (For use with an accelerating driver IC if the command voltage becomes high
(three-phase systems).)
No.A0366-4/20
LB8503V
Block Diagrams and Application Examples
Combination with an accelerating driver IC when the command voltage goes low (single-phase systems)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
C5
6VREG
EDGE
FGIN
R3
RC
C3
FG
FG
One-shot
multivibrator
R1
EI
C6
LIM
R2
C2
VTH
VREF
C1
EO1
SOFT
CVI
R4
CVO
VREG
R5
EO3
C
CTL
signal
CTL
CTL
GND
I LB01769
No.A0366-5/20
LB8503V
Combination with an accelerating driver IC when the command voltage goes high (three-phase systems)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
6VREG
EDGE
C5
FG
FG
FGIN
R3
RC
C3
One-shot
multivibrator
R1
EI
C6
LIM
R2
C1
R4
SOFT
CVI
CVO
C2
EO1
VREF
VREG
R5
VCTL
EO3
C
CTL
signal
CTL
CTL
GND
I LB01770
No.A0366-6/20
LB8503V
Speed Control Diagrams
The slope is determined by the external
constant connected to the RC pin.
(RPM)
For a larger RC
time constant
For a smaller RC
time constant
Speed
Minimum
speed
Determined by the LIM pin voltage
Low← CTL pin (PWM DUTY)
High←
EO1 pin voltage (V)
Low←
EO3 pin voltage (V)
0%
Set minimum
speed
→High
→Low
→High
Variable speed
Low on duty
100%
Full speed
High on duty
CTL pin
6VREG
LIM voltage
EO pin
EO1 voltage
0V
Startup Timing (soft start)
VCC pin
CTL pin
SOFT pin
Stop
Stop
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
No.A0366-7/20
LB8503V
Supplementary Operational Descriptions
The LB8503V 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
LB8503V
FGIN
CTL
signal
FG
CTL
Closed
feedback
loop
EO
VTH
As shown in the figure below, the LB8503V 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 LB8503V then integrates that pulse waveform to create the output driver IC control voltage (a DC voltage).
FG
EDGE pulse
Slope due to the
RC time constant
RC pin
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.A0366-8/20
LB8503V
Pin Setting Procedures (Provided for reference purposes)
[RC pin]
The slope in the speed control diagram is determined by the RC pin time constant.
(RPM)
Motor
full speed
0%
100%
CTL Duty (%)
I LB01771
1. Determine the FG signal frequency (fFG (Hz)) at the motor's highest speed.
(When 2 FG pulses are created on each motor revolution.)
fFG(Hz)=2rpm/60 .........................................................(1)
2. Determine the time constant for the RC pin.
(Let DUTY be the control duty at the highest motor speed. For example, 100% = 1.0, 60% = 0.6)
R×C=DUTY/(3×0.85×fFG) ............................................. (2)
3. Determine the resistor and capacitor values
The range of capacitors that can be used is from 0.01 to 0.015 µF due to the charge capabilities of the RC pin circuit.
Therefore, an appropriate resistor value can be determined from either (3) or (4) below from the result obtained in
step 2 above.
R=(R×C)/0.01μF....................................................... (3)
R=(R×C)/0.015μF..................................................... (4)
Note that the temperature characteristics of the curve are determined by the temperature characteristics of the
capacitor connected to the RC pin.
A capacitor with excellent temperature characteristics must be used to minimize motor speed variation with
temperature.
No.A0366-9/20
LB8503V
[CVO and CVI Pins]
These pins determine the origin of the slope. (To set the origin to 0% at 0 rpm, short CVO to CVI.)
1. X axis shift (Resistor dividing the CVO to ground potential)
(RPM)
Motor
full speed
X axis shift
0%
100%
CTL Duty (%)
To shift the characteristics from a 0% = 0 rpm origin to a situation where the speed at a duty of 30% is shifted to 0%:
First, determine the required CVI pin input voltage at 0%.
CVI = 6 - (4 × DUTY) = 6 - (4 × 0.3) = 6 - 1.2 = 4.8V
Next, when CVO is 6V, determine the resistor values for the resistor divider between CVO and ground such that the
midpoint becomes 4.8V.
CVO - CVI : CVI - ground = 1.2V : 4.8V = a ratio of 1 : 4.
From the above, the desired resistor values will be 20kΩ between CVO and CVI and 80kΩ between CVI and ground.
Note that the slope will change. (In this case, since the resistor ratio is 1:4, the result will be 4/5 of (or 0.8 times) the
original slope.)
If required, the RC pin resistor value must be changed to correct the slope.
LIM
VREF
SOFT
CVI
R4
CVO
R5
C
CTL
CTL
ILB01773
No.A0366-10/20
LB8503V
2. Y axis shift (Resistor dividing the CVO to VCC potential)
(RPM)
Motor
full speed
X axis shift
0%
100%
CTL Duty (%)
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
LIM
VREF
R5
SOFT
R4
CVI
CVO
C
CTL
CTL
ILB01775
No.A0366-11/20
LB8503V
[LIM Pin]
The minimum speed is determined by the LIM pin voltage.
(RPM)
Motor
full speed
10000
8000
6000
4000
Set minimum 2000
speed
0
0%
6V
CTL Duty (%)
CVO pin voltage (V)
100%
2V
1.
Determine the ratio of the required minimum speed and the maximum speed.
Ra = minimum speed/maximum speed......... (1)
In the example in the figure above, Ra = minimum speed/maximum speed = 3000/10000 = 0.3
2.
Determine the product of the duty that produces the maximum speed and the value from equation 1.
Ca = maximum speed duty × Ra .................. (2)
For example, Ca = maximum speed duty × Ra = 0.8 × 0.3 = 0.24
3.
Determine the required LIM pin voltage
LIM = 6 - (4 × Ca) ....................................... (3)
For example, LIM = 6 - (4 × Ca) = 6 - (4 × 0.24) ≈ 5V
4.
Generate the LIM voltage by resistor dividing the 6 V regulator voltage.
For example, the resistor ratio to create a 5V level will be 1:5.
Thus the resistor values will be 10kΩ between 6VREG and LIM and 51kΩ between LIM and ground.
6VREG
LIM
VREF
SOFT
CVI
ILB01777
No.A0366-12/20
LB8503V
[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 180Ω (typical).)
1/f = t < RC
Note that the larger the capacitor, the slower its response to changes in the input signal will be.
6VREG
A capacitor that can smooth the pin voltage is
connected here.
1/f = t < CR
CTL pin input inverted
waveform (the frequency is the
same)
C pin
180kΩ
CTL pin
CTL circuit
VREF circuit
No.A0366-13/20
LB8503V
Application Example 2
[Setting the minimum speed for an origin of 0% = 0 rpm]
(RPM)
Motor
full speed
Set minimum
speed
0%
100%
PWM Duty(%)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
6VREG
EDGE
C5
FG
FG
FGIN
R3
C3
RC
One-shot
multivibrator
R1
C6
R2
C1
EI
LIM
C2
VREF
EO1
VTH
SOFT
CVI
CVO
VREG
EO3
C
CTL
signal
CTL
CTL
GND
When the speed control diagram origin is 0% = 0 rpm, the CVO pin is connected to the CVI pin.
If the minimum speed is not set, connect the LIM pin to the 6VREG pin.
No.A0366-14/20
LB8503V
Application Example 3
[Origin shift in the Y direction (the motor turns at 0%)]
(RPM)
Motor
full speed
0%
100%
PWM Duty(%)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
6VREG
EDGE
C5
FG
FG
FGIN
R3
RC
C3
One-shot
multivibrator
EI
C6
LIM
C2
VREF
C1
EO1
VTH
SOFT
CVI
R4
CVO
VREG
R5
EO3
C
CTL
signal
CTL
CTL
GND
When the speed control diagram origin is set so the motor turns at 0%, the CVO pin to ground potential difference is
resistor divided and the midpoint is input to the CVI pin.
The speed at 0% can be changed with the resistor ratio.
No.A0366-15/20
LB8503V
Application Example 4
[Origin shift in the X axis direction (The motor turns at a duty of 10% or higher) plus a minimum speed setting]
(RPM)
Motor
full speed
0%
100%
PWM Duty(%)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
6VREG
EDGE
C5
FG
FG
FGIN
R3
RC
C3
One-shot
multivibrator
EI
C6
LIM
C2
VREF
C1
EO1
VTH
SOFT
CVI
R5
R4
CVO
VREG
EO3
C
CTL
signal
CTL
CTL
GND
When the origin in the speed control diagram is set so that the motor starts turning when the duty is above 0%. the
potential difference between the CVO pin and VCC is resistor divided, and that divided level is input to the CVI pin.
The duty at which rotation starts can be changed by changing the resistor ratio.
Note that the total value of the resistors R4 and R5 must exceed 100kΩ.
No.A0366-16/20
LB8503V
Application Example 5
[DC Voltage Speed Control]
(RPM)
Motor
full speed
Set minimum
speed
0
6V
2V
CV1 pin voltage (V)
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
C5
6VREG
EDGE
FG
FG
FGIN
R3
C3
RC
One-shot
multivibrator
R1
C6
R2
DC voltage
EI
LIM
SOFT
CVI
CVO
C2
EO1
VREF
VTH
VREG
EO3
C
CTL
CTL
GND
When the motor speed is controlled by a DC voltage, that voltage must be in the range from 2V to 6VREG.
Note that the motor stops when the control voltage is at 6VREG, and the motor speed increases as the voltage falls.
No.A0366-17/20
LB8503V
Application Example 6
[Fixed Speed + Soft Start]
(RPM)
Motor
full speed
0%
20%
40%
60%
80%
100%
CTL signal (PWM duty)
C pin voltage
6V
LB8503V
12V
VCC
C4
VREG
FGOUT
VREG
C5
6VREG
EDGE
FG
FG
FGIN
R3
C3
RC
One-shot
multivibrator
R1
C6
R2
EI
LIM
C2
VREF
EO1
VTH
SOFT
CVI
CVO
VREG
EO3
C
CTL
CTL
GND
With this circuit, the motor speed remains constant even if there are fluctuations in the supply voltage or static voltage.
It is also possible to input a fixed-duty signal to the CTL pin signal input as an input signal for which soft start is
enabled at startup.
No.A0366-18/20
LB8503V
Application Example 7
[Used in Combination with the LB11660FV]
LB8503V
12V
VCC
C4
LB11660FV/RV
VREG
FGOUT
VREG
6VREG
EDGE
C5
FG
FG
FGIN
R3
RC
C3
One-shot
multivibrator
R1
EI
C6
LIM
R2
C2
EO1
VREF
C1
SOFT
CVI
R4
VTH
CVO
VREG
R5
EO3
C
CTL
signal
CTL
CTL
GND
In this circuit, the dynamic range of the LB8503V 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 LB8503V amplifier output low-level
voltage, it must be resistor divided.
No.A0366-19/20
LB8503V
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PS No.A0366-20/20
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