Ordering number : EN*A0335
LB8502PM
Monolithic Digital IC
DC Fan Motor Speed Control IC
Combining this IC (LB8502PM) and general-purpose motor driver IC, easy speed control by speed feed back is realized.
Compared to open loop control, this IC improves rotation speed precision and rotation speed variation due to load change.
Based on a duty pulse signal which is a speed command signal, and a FG signal (motor speed signal) from a driver IC,
command voltage which controls the driver IC is output. There are two types of the DC fan motor speed control IC due to
the difference in command voltage logic depending on the specification of the driver IC.
•
LB8500M : for the driver IC which accelerates the motor when the command voltage is low (single phase system).
•
LB8502M : for the driver IC which accelerates the motor when the command voltage is high (3 phase system).
•
LB8502M : automotive type of LB8502M, Operating Conditions at Topr=-40 to +95°C
Functions and features
•
Enabling minimum speed setup
•
Enabling the slope of the rotation change to the duty change
•
Built-in the one-shot multi-pulse output circuit
•
Built-in the integrator amplifier circuit
•
Built-in 6V regulator curcuit
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Source Voltage
Output Current
Allowable Power Dissipation
Operating Temperature
Storage Temperature
Symbol
VCC max
IO max
Pd max
Topr
Tstg
VCC pin
EO pin
Mounted on a specified board (*1)
Conditions
Ratings
18
3
0.87
-40 to +95
-55 to +150
Unit
V
mA
W
°C
°C
(*1) Mounted on a specified board: 114.3mm×76.1mm×1.6mm glass epoxy
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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
products described or contained herein.
N2206 / 22406 MH IM No.A0335-1/11
LB8502PM
Allowable Operating Range
at Ta = 25°C
Parameter
Supply Voltage Range 1
Supply Voltage Range 2
Output Current
6V Constant Voltage Output Current
CTL Pin Applied Voltage
LIM Pin Applied Voltage
Symbol
VCC1
VCC2
IO
IREG
CTL
VLIM
VCC pin
VCC pin, VCC and 6VREG pins shorted
EO pin
Conditions
Ratings
7.5 to 17
5.5 to 6.5
2.5
-5
0 to VREG
0 to VREG
Unit
V
V
mA
mA
V
V
Electrical Characteristics
at Ta = 25°C, VCC = 12V
Parameter
Current Drain
[6V Constant Voltage Output (VREG Pin)]
Output Voltage
Line Regulation
Load Regulation
Temperature Coefficient
[Integrator Amplifier Block]
Common Phase Input Voltage Range
Output High Level Voltage
Output Low Level Voltage
[FGIN Pin]
High Level Input Voltage
Low Level Input Voltage
Input Open Voltage
Hysteresis Width
High Level Input Current
Low Level Input Current
[RC Pin]
Output High Level Voltage
Output Low Level 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]
Output High Level Voltage
Output Low Level Voltage
[LIM Pin]
Input Bias Current
Common Phase Input Voltage Range
IB(LIM)
VILIM
-1
0
0
VREG-2.0
µA
V
VOH(C)
VOL(C)
3.8
0.05
4.0
0.1
4.2
0.2
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
µA
µA
VOH(RC)
VOL(RC)
VCLP(RC)
3.2
0.8
3.45
0.95
1.6
3.7
1.05
V
V
V
VFGH
VGFL
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
µA
µA
VICM
VOH
VOL
IEO=-0.2mA
IEO=0.2mA
0
VREG-1.2
VREG-0.8
0.8
1.0
VREG-2.0
V
V
V
VREG
∆VREG1
∆VREG2
∆VREG3
VCC=8 to 17V
IO=0 to 5mA
Design target value*
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
*:
Design target value and no measurement was made.
No.A0335-2/11
LB8502PM
Package Dimensions
unit : mm
3086B
0.63
1.7max
4.4
5.0
10
6
1
5
0.15
0.35
1.0
(0.5)
0.1 (1.5)
SANYO : MFP10S(225mil)
Pin Assignment
EO
10
6.4
EI
9
GND
8
LIM
7
FGIN
6
LB8502PM
1
RC
2
VREG
3
VCC
4
C
5
CTL
Top view
Pin Functions
Pin name
RC
VREG
VCC
C
CTL
FGIN
LIM
GND
EI
EO
Pin No.
1
2
3
4
5
6
7
8
9
10
One-shot multi-pulse width setup pin.
Connect a resistor between this pin and the VREF pin and a capacitor between this pin and GND.
6V regulator output pin. Connect a capacitor between this pin and GND for stabilization.
Power supply pin. Connect a capacitor between this pin and GND for stabilization.
The pin for duty pulse stability and setting soft start time.
Connect a capacitor between this pin and GND.
Duty pulse input pin.
Speed control is performed by the pulse duty.
FG pulse input pin.
Minimum speed setup pin.
Normally, the voltage across the resistor divider connected to the 6VREG input in this pin.
Ground pin.
The pin of the one-shot multi pulse output and the integrator amplifier input.
Connect a capacitor between this pin and the EO pin for integration.
The integrator amplifier output pin.
Pin functions
No.A0335-3/11
LB8502PM
Speed Control Diagram
The slope is determined by a constant of the RC pin.
(RPM)
When the CR time constant is large.
When the CR time constant is small.
Rotation
speed
Minimum
speed
The position is determined by the LIM pin voltage.
Small
←
Small
←
CTL signal (PWM DUTY)
EO pin voltage
→
large
→
small
(%)
(V)
The minimum speed setup rotation
ON-Duty-small
CTL pin
Adjustable speed
Full speed
ON-Duty-large
6VREG
EO voltage
EO pin
LIM voltage
0V
Startup Timing (Soft Start)
VCC pin
CTL pin
Stop
Full speed
Soft start
The slope is changed by the capacity of the C pin
(When the voltage of the C pin become large, the slope becomes large)
EO pin
Stop
Full speed
No.A0335-5/11
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