Fairchild FAN8903 Power window motor control ic Datasheet

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FAN8903(KA3903)
Power Window Motor Control IC
Features
Description
• Protections
- Human body protection with a simple switch
- Over current protection with an integrator
- Over voltage protection
- Load dump protection
- Reverse battery voltage protection
• Low off-state quiescent current (150µA)
• Adjustable output control time after
car-key turn-off
• Four selectable operating modes
• Thermal shutdown (TSD)
• Under voltage lockout
The FAN8903 is a monolithic integrated circuit, suitable for
a window motor control and sun roof motor control in automotive systems.
Typical Applications
Ordering Information
• Power Window
• Sun Roof
16-DIP-300A
Device
Package
Operating Temperature
FAN8903
16-DIP-300A
−40°C ~ +90°C
Rev. 1.0.2
©2001 Fairchild Semiconductor Corporation
FAN8903(KA3903)
VCC
START
DOWN
UP
M1
M2
OUT 2
PG
Pin Assignments
16
15
14
13
12
11
10
9
6
7
8
OUT 1
STEP
5
CS
4
A/O
3
F/C
2
CT
GND
1
VREF
FAN8903
Pin Definitions
2
Pin Number
Pin Name
1
GND
Signal ground
Pin Function Descrition
2
Vref
Voltage reference output (typ=5.0V)
3
CT
Step / Auto pulse generator output
4
STEP
Step bias signal input
5
F/C
Full close signal input
6
A/O
OP amp output
7
CS
Current sense signal input
8
OUT 1
9
PG
10
OUT 2
11
M2
Selectable mode signal input 2
12
M1
Selectable mode signal input 1
13
UP
Up signal input
14
DOWN
Down signal input
15
START
Start up signal input
16
VCC
Up signal output
Power ground
Down signal output
Supply voltage
FAN8903(KA3903)
Internal Block Diagram
VCC
16
Start COMP
Start
15
18.6V
+
−
Vref1
UVLO
5V reference
Delay
TSD
8
OUT 1
10
OUT 2
13
Delay
Gate drive
logic
Input
Down 14
D
CLK
Q
Q
Latch 2
CS
7
A/O
6
F/C
5
−
+
Vref2
Human
protection
Vref3
Vref
Q
D
CLK Q
Mode
selection
GND
Vref
Vref
Latch 1
Up
2
OVP
1
Delay
12
M1
Vref4
9
PG
3
CT
4
Step
+
−
+
−
11
M2
3
FAN8903(KA3903)
Absolute Maximum Rating
Parameter
Symbol
Value
Unit
Supply voltage 1
VCC1
17
V
Supply voltage 2: reverse bias
VCC2
−0.7
V
Output current
IO
400
mA
Power dissipation
PD
1.0
W
Operating ambient temperature
TOPR
−40 ~ +90
°C
Storage temperature
TSTG
−60 ~ +150
°C
Electrical Characteristics
(VCC=12V, Ta=25°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
VST
-
8.3
8.8
9.3
V
VHYS
-
1.1
1.25
1.6
V
18.6
20.0
V
UNDER VOLTAGE LOCK SECTION
Start-up threshold voltage
UVLO hysteresis
Supply zener voltage
VZ
ICC=20mA
17.2
OPERATING RANGE SECTION
Operating supply voltage
VCC
VREF=5V
8.0
-
17.0
V
Operating supply current (Off)
ICC1
VSTART=Open
-
150
200
µA
Operating supply current (On)
ICC2
VSTART=12V
-
5.0
6.0
mA
4.8
5.0
5.2
V
REFERENCE SECTION
Reference voltage
-
VREF
Line regulation
REG, II
8V < VCC < 17V
-
1
2
mV / V
Load regulation
REG, IO
0mA < IREF < 2mA
-
1
4
mV / mA
VUP, VDOWN, VFC=0V
20
28
36
kΩ
Vout on / off S/W Vtg
3.0
3.2
3.4
V
VTH2
4.2V < VCT < 4.6V
4.2
4.4
4.6
V
Output saturation voltage
VSAT
IO=0.2A
-
1.0
1.2
V
Sustain voltage
VSUS
IO=20mA
17.2
18.6
20.0
V
VAMP
VCS=Vouta
0.23
0.25
0.27
V
VOUTH
IO=−10µA
4.0
4.2
-
V
VOUT1
IO=+10µA
-
0.05
0.1
V
COMPARTOR SECTION (UP/DOWN/FG BLOCK)
Input resistance
Comparing reference voltage 1
RIN
VTH1
COMPARATOR SECTION (CT BLOCK)
Comparing reference voltage 2
OUTPUT SECTION
OP AMP SECTION
AMP reference voltage
Output voltage range
4
FAN8903(KA3903)
Application Information
FAN8903
BAT.
UVLO & REFERENCE
UP
DOWN
BASIC FUNCTIONS
INPUT
LOGIC
TIMING
OUTPUT
POWER
STAGE
M
SPECIAL FUNCTIONS
START KEY
KEY-OFF
MODE SELECTION
WINDOW
FRAME
PRETECTION FUNCTIONS
OCP
OVP
HUMAN BODY
S/W
POWER WINDOW SYSTEM
General
When the start-key is turned on by operator, the FAN8903 will wait the command up or down of the window.
Upon the command up, the power stage composed of relays will be activated by basic function circuit which consists of input,
logic, timing and output circuit.
So the motor starts to rotate in the right direction to lift the window, while rotate in the counter direction with the command
down to down the window.
The OCP (over current protector) is made up to protect the motor in an abnormal condition of the system during the rotation of
motor according to the command up or down.
The OCP time technique is used to detect over current not sensitive to a start peak current or a current slightly lager than the
reference current.
The FAN8903 is based on the safety by consisting of the human body protection circuit with a simple switch attached to the
window frame for cost-effective method but hard to the european specification. It also is possible to use photo sensor to meet
the specification.
Moreover the FAN8903 has the car-key turn-off function and the mode selection function.
5
FAN8903(KA3903)
Start Stage
FAN8903
VCC
VCC
START KEY
R2
10k
COMP1
V1
15
BAT.
+
−
+
R1
300k
C1
47µF
UVLO &
REFERENCE
0.92V
(at VCC=12V)
In the state of the start-key turned off, all the blocks in the FAN8903 are kept to be off because the power is not supplied into
UVLO&REFERENCE block.
When the start-key is turned on, the power is supplied into UVLO block to activate reference block in normal condition.
Step and Auto Time
FAN8903
2
R5
Vref3
Rt
+
−
Vct
V5
3
+
4
−
+
R6
Ct
Q1
If the up/down switch is pushed less than a set time (Ts), TR (Q1) will be turned off and capacitor (Ct) is charged exponentially
until Vct equals to V5. At that time TR (Q1) is turned on and stops the operation.
But if longer than TS, capacitor (Ct) continues its charge until Vct equals to Vref3. Then Q1 is turned on and the auto function
terminates its operation.
The TS and Ta(auto time) were determinate by components (Rt & Ct), external divider and Vref3.
T S = 0.05 × ( Rt × Ct ) , where V5 = 0.25V
T a = 2.10 × ( Rt × Ct ) , where Vref3 = 4.4V
In the manual mode, the window goes up or down just while a switch is pushed. In the step mode and the auto mode, even after
releasing the switch, the window continues its movements except for pushing the switch again (the topple) or happening to the
stall condition.
6
FAN8903(KA3903)
Car-key Turn-off Function
The window can be operated for a certain period even in the state of the start-key to be off. If the start-key is turned off, the discharge time for the voltage V1 to pin #15 will be determined by the following time constant.
τ = ( R1 + R2 )C1
User can get a time he wants as the discharge time for the voltage V1 by changing the capacity of the cap (C1) and the values
of the resistances (R1 or R2).
Therefore, the user can operate the window for a limited time (about 30sec) even if the start-key is turned off
Mode Selection
Pin Name
Mode
Operation
M1
M2
UP
DOWN
LL-MODE
L
L
Normal
Normal
LH-MODE
L
H
Normal
Toggle & Auto
HL-MODE
H
L
Normal
Toggle, step & Auto
HH-MODE
H
H
Toggle, step & Auto
Toggle, step & Auto
Notes:
1. L : M1 or M2 = Ground, H : M1 or M2 = Open
2. NORMAL: The window is working as long as the up or down switch is pressed.
3. TOGGLE: When the window works by pressing the up or down switch, the window is stopped if the up or down switch is
pressed once more.
4. STEP & AUTO: If the up or down switch is pressed for a certain period (0.3 seconds), the window works for 0.3 seconds,
while 6 seconds if pressed for more than a certain period (0.3 seconds).
Over Voltage Protection(OVP)
It is designed stop the control of the FAN8903 if battery voltage is sensed as about 18.6V or more.
FAN8903
Rin
180
16
BAT.
12V
47µF
18.6V
7
FAN8903(KA3903)
Over Current Protection
Simple Applications
The voltage (Vrs) proportional to the motor current is generated across the resistor (RS). If the Vrs exceeds the reference voltage (Vref), over current part-time integration carried out through R3, C2 and OP-amp.
When the amount of over current integration is lager than S2, the over current signal issued.
The cancel time (TC) between motor stall and motor switch-off is determined by following equations;
T C = ( C2 × dV ) ⁄ I C
where , I C = ( Vrs – Vref ) ⁄ R3
dV = Vouth – 0.8
You can adjust both the value of the sensing resistor (RS) according to motor type and the cancel time by changing R3 and
C2. Additionally the over current detection of the FAN8903 is immune to any sudden peak current or a current slightly lager
than the reference current.
FAN8903
OCP
MOTOR
6
R3
47k
C2
474
Vrs
Vro
OP-amp
−
7
Vro
+
RS
20mΩ
Vref
S2
S1
−
0.8V
Vref
OCP
Vrs
+
Temperature Compensation Applications
Generally speaking, the less ambient temperature, the more motor current. In the previous applications, there are some difficulties to decide the reference current level.
In case of low ambient temperature, the difference between the operating motor current and the reference current is very small.
When the reference current level is high, the margin is large. But at a high ambient temperature, the difference between the
motor current and the stall current is small.
Moreover, the stall current at depends on a battery voltage. It is hard to decide what the optimal reference level is.
In the following figure, in the room temperature, the inverting voltage (V2) and the reference current are calculated as follows;
V2 = Vcom × R3 ⁄ ( Rntc + Rt + R3 )
Vcom = Vref – V2
The resistance of the NTC decreases according to rising of the ambient temperature. So the reference level, Vcom is changed
with the temperature change as shown in the following figure.
To ensure precision of the reference level, Rt can be adjusted.
8
FAN8903(KA3903)
FAN8903
A
2
NTC
Stall current
MOTOR
6
Rt
260k
C2
105
Vrs
RS
10mΩ
OP-amp
Vref
−
7
R3
47k
V2
Vro
Vcom
+
Motor current
−
0.8V
Vref
OCP
°C
+
Human Body Protection(HBP)
Using An End Switch
The human body protection is to be carried out when the over current protection signal is issued just while the window glass
is up going and the end switch is closed, in the auto mode. The controller stop the window glass, and then reverses the rotating
direction of motor to move down the window at the bottom.
There are some cases in the window glass to be locked; its upper limit, bottom, and obstacle like human body, neck, and hand
etc. The OCP function would work in any cases. So it is necessary for the controller to discriminate whether something is
squeezed between the window glass and the window frame or not.
The end switch is opened only when the window glass reaches almost its upper limit.
Leave the F/C pin open unless you want this function.
FAN8903
VCC
Vref
WINDOW
FRAME
R4
10K
+
V1
5
−
COMP
End
switch
C3
103
Using Photo Devices (No Touch Sensor)
In case of using an end switch, the HBP function works on the condition that the over current signal is issued.
So it could have some sensitivity problem. It is very hard to decide what the optimal reference current and cancel time are.
We have tested new principle and as a result, developed one light based HBP function. The below figure explain the principle
of the operation.
As sender and receiver are arranged together, it is possible for the receiver to detect the sent diode light.
9
FAN8903(KA3903)
The position of the sensor must be set adequately upper part of the window. When the obstacle between the window glass and
the upper limit are inserted, the light sensor TR is turned off. The sensor have a two function;
- End position switch,
- Issuing the OCP signal.
Q2 is used to make the F/C pin low, and Q4 enables to turn-on Q6 to issue the OCP signal.
As soon as Q2 is turned on, V2 changes from the equation mentioned in 6.2 paragraph to the below equation.
V2 = Vcom × [ R10 // ( Rntc + Rt ) ] ⁄ [ R10 // ( Rntc + Rt ) + R5 ]
and OP-amp output become low level. Therefore the HBP logic stops the motor and reverses the direction of the motor.
You can adjust the delay time by changing the value of the resistor, R10. The added part works only when Q5 is on-state. In
other words, when the window glass is moving upward, the added part operates. Q3 is also turned on and holds the F/C pin low
level.
Start key
FAN8903
VCC
Added part
+
R4
KSR1012
V1
COMP
C3
Q3
Q2
−
5
Motor
(+)
2
Light
sense
KSR2007
Q6
NTC
6
Q4
KSC945
Q5
R10
Rt
C2
OP-amp
−
7
Pin #8
Vro
+
R3
−
Vref
0.8V
+
OCP
RS
Output Stage
The output stage is a darlington TR with an integrated zener diode, and designed at a pulse current of a approx. 0.4A. The
zener diode limits the inductive switch-off voltage. The relay coil has a typical resistances of 200Ω, and the zener diode voltage is 18.6V.
With the circuitry of this type, the FAN8903 can sustain 24V for one minute (or continuously) and load dump
(70V, 0.2sec) condition without a damage.
10
FAN8903(KA3903)
Power Supply
For the reasons of interference protection and surge immunity, all circuit should be provided with a RC circuit for a current
limitation in the event of overvoltage and for buffering in the event of voltage dips at Vref.
Suggested dimensioning; Rin=180Ω, Cin=47µF, as shown in the typical applications.
There ia a 18.6V zener diode between VCC and GND.
Load Dump Protection
The load dump protection withstands up to 70V (refer to the typical application-I) with a decay time.
In this case, the power dissipation of the FAN8903 takes please at three parts; VCC, OUT1 and OUT2.
But in the typical application-II, the supply voltage of the relay is limited the internal zener diode voltage.
The power dissipation of the output stage is not on count. So the FAN8903 can withstand up to 100V load dump with τ=
200ms.
1. REVERSE BATTERY VOLTAGE PROTECTION
In case of the reverse battery, the FAN8903 is modeled with a diode. Due to the external impedance at pin #16, the FAN8903
is protected against reverse battery voltage for one minute (or continuously).
11
FAN8903(KA3903)
Typical Application Circuit1
Start key
BAT.
12V
Rin
180
1
2
VCC
GND
16
Vref
Start
15
390k
+
Cin
47µ
3
+
Ct
4.7k
10µ
Down
14
Down S/W
104
FAN8903
4
Step
4.7k
Up S/W
UP
13
F/C
104
5
M1
12
6
A/O
M2
M1
M2
11
474
CS
OUT 2
10
7
M
68k
OUT 1
8
PG
9
Relay
RS
20m
12
FAN8903(KA3903)
Typical Application Circuit2
1N4937
BAT.
12V
Rin
180
1
VCC
GND
16
+
Cin
47µ
Start key
2
Vref
10k
Start
150k
390k
15
+
300k
47µ
+
12k
3
Ct
10µ
Down
14
4.7k
Down S/W
104
FAN8903
4
Step
Up S/W
UP
4.7k
F/C
13
104
5
End
switch
4.7k
103
NTC
M1
260k
6
A/O
CS
M2
OUT 2
12
M1
M2
11
10
7
M
8.2k
OUT 1
8
PG
9
Relay
RS
10m
13
FAN8903(KA3903)
Typical Application Circuit 3
Start key
1N4937
BAT.
12V
Rin
180
VCC
GND
C2690
+
16
1
Cin
47µ
Vref
2
150k
Start
390k
3
+
12k
15
Ct
4.7k
Down
10µ
14
FAN8903
4
1k
5
Down S/W
104
4.7k
Step
UP
F/C
Up S/W
13
104
106
NTC
M1
260k
6
A/O
M1
12
M2
M2
11
474
7
OUT 1
OUT 2
10
M
8.2k
8
CS
PG
9
Relay
End
switch
RS
10m
KSR1012
Q2 Q3
KSR1012
Pin #2
47k
Q6
KSR2007
Light
sensor
Q4
KSC945
R10
Q5
Pin #8
14
KSR1008
Pin #7
FAN8903(KA3903)
15
FAN8903(KA3903)
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
3/17/01 0.0m 001
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 2001 Fairchild Semiconductor Corporation
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