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FAN8903(KA3903)
Power Window Motor Control IC
Features
* 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 (150A) * Adjustable output control time after car-key turn-off * Four selectable operating modes * Thermal shutdown (TSD) * Under voltage lockout
Description
The FAN8903 is a monolithic integrated circuit, suitable for a window motor control and sun roof motor control in automotive systems.
16-DIP-300A
Typical Applications
* Power Window * Sun Roof
Ordering Information
Device FAN8903 Package 16-DIP-300A Operating Temperature -40C ~ +90C
Rev. 1.0.2
(c)2001 Fairchild Semiconductor Corporation
FAN8903(KA3903)
Pin Assignments
START DOWN OUT 2
VCC
16
15
14
13
12
11
10
FAN8903
1 GND
2 VREF
3 CT
4 STEP
5 F/C
6 A/O
7 CS
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name GND Vref CT STEP F/C A/O CS OUT 1 PG OUT 2 M2 M1 UP DOWN START VCC Signal ground Voltage reference output (typ=5.0V) Step / Auto pulse generator output Step bias signal input Full close signal input OP amp output Current sense signal input Up signal output Power ground Down signal output Selectable mode signal input 2 Selectable mode signal input 1 Up signal input Down signal input Start up signal input Supply voltage Pin Function Descrition
2
OUT 1
PG 9 8
M1
M2
UP
FAN8903(KA3903)
Internal Block Diagram
VCC 16 Start COMP Start 15 Vref1 + - 18.6V UVLO 5V reference Delay 2 TSD OVP Latch 1 Up 13 Input Down 14 CS A/O F/C 7 6 5 Gate drive logic Delay D CLK Latch 2 - + Q Q 10 OUT 2 Vref 8 OUT 1 Vref
Vref2 Human protection Vref3 Vref + - 3 + - CT 9 PG
Mode selection GND 1 Delay
Q D CLK Q Vref4
4 12 M1 11 M2
Step
3
FAN8903(KA3903)
Absolute Maximum Rating
Parameter Supply voltage 1 Supply voltage 2: reverse bias Output current Power dissipation Operating ambient temperature Storage temperature Symbol VCC1 VCC2 IO PD TOPR TSTG Value 17 -0.7 400 1.0 -40 ~ +90 -60 ~ +150 Unit V V mA W C C
Electrical Characteristics
(VCC=12V, Ta=25C, unless otherwise specified) Parameter Start-up threshold voltage UVLO hysteresis Supply zener voltage OPERATING RANGE SECTION Operating supply voltage Operating supply current (Off) Operating supply current (On) REFERENCE SECTION Reference voltage Line regulation Load regulation Input resistance Comparing reference voltage 1 Comparing reference voltage 2 OUTPUT SECTION Output saturation voltage Sustain voltage OP AMP SECTION AMP reference voltage Output voltage range VAMP VOUTH VOUT1 VCS=Vouta IO=-10A IO=+10A 0.23 4.0 0.25 4.2 0.05 0.27 0.1 V V V VSAT VSUS IO=0.2A IO=20mA 17.2 1.0 18.6 1.2 20.0 V V VREF REG, II REG, IO RIN VTH1 VTH2 8V < VCC < 17V 0mA < IREF < 2mA VUP, VDOWN, VFC=0V Vout on / off S/W Vtg 4.2V < VCT < 4.6V 4.8 20 3.0 4.2 5.0 1 1 28 3.2 4.4 5.2 2 4 36 3.4 4.6 V mV / V mV / mA k V V VCC ICC1 ICC2 VREF=5V VSTART=Open VSTART=12V 8.0 150 5.0 17.0 200 6.0 V A mA Symbol VST VHYS VZ ICC=20mA Conditions Min. 8.3 1.1 17.2 Typ. 8.8 1.25 18.6 Max. 9.3 1.6 20.0 Units V V V
UNDER VOLTAGE LOCK SECTION
COMPARTOR SECTION (UP/DOWN/FG BLOCK)
COMPARATOR SECTION (CT BLOCK)
4
FAN8903(KA3903)
Application Information
FAN8903
BAT. UVLO & REFERENCE
UP INPUT
BASIC FUNCTIONS LOGIC TIMING OUTPUT POWER STAGE M
DOWN
SPECIAL FUNCTIONS KEY-OFF MODE SELECTION WINDOW FRAME PRETECTION FUNCTIONS OCP OVP HUMAN BODY S/W
START KEY
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
V1 15 + + C1 47F
COMP1 - UVLO & REFERENCE 0.92V (at VCC=12V)
BAT.
R1 300k
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 Rt Vref3 + -
Vct V5 + R6 Ct
3 4 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 x ( Rt x Ct ) , where V5 = 0.25V T a = 2.10 x ( Rt x 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.
= ( 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
Mode LL-MODE LH-MODE HL-MODE HH-MODE
Pin Name M1 L L H H M2 L H L H Normal Normal Normal UP
Operation DOWN Normal Toggle & Auto Toggle, step & Auto 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
47F
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 x 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 Vrs RS 20m Vref C2 474 7 OP-amp - + - 0.8V + Vref OCP Vrs Vro S1 S2 Vro
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 x 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 MOTOR Rt 260k Vrs RS 10m R3 47k V2 6 C2 105 7 OP-amp Vref - + - Vref 0.8V + Motor current OCP C Vro Vcom
Stall current
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 End switch C3 103 + V1 5 - COMP
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 x [ 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 + V1 C3 Motor (+) 2 KSR2007 Q6 Q4 KSC945 R10 Rt C2 7 R3 Vref RS 0.8V NTC 6 OP-amp - + - + OCP Vro 5 - COMP
KSR1012
Q2
Q3
Light sense
Q5
Pin #8
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 200, 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=180, Cin=47F, 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 = 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 Rin 180 1 GND VCC 16 BAT. 12V
2 390k
Vref Start 15 + Cin 47
+ 10
3
Ct 4.7k Down 14 104 Down S/W
FAN8903
4 Step UP F/C 5 13 104 4.7k Up S/W
M1 12 A/O M2 11
M1
M2
6 474
CS 7
OUT 2 10
M 68k 8 OUT 1 PG 9
Relay
RS 20m
12
FAN8903(KA3903)
Typical Application Circuit2
1N4937 Rin 180 1 GND VCC 16
BAT. 12V
+ Cin 47 Start key
2 150k 390k
Vref Start 15 + 47 Ct
10k
300k
+ 12k 10
3
Down
14 104
4.7k
Down S/W
FAN8903
4 4.7k F/C End switch NTC M1 12 M1 5 103 Step UP 13 104 4.7k Up S/W
260k 6
A/O
M2
M2 11
CS 7
OUT 2
10
M 8.2k 8 OUT 1 PG 9
Relay
RS 10m
13
FAN8903(KA3903)
Typical Application Circuit 3
1N4937 Rin 180 GND 1 VCC 16 + Cin 47 Vref 2 150k 390k Ct 4.7k Down 14 Start 15 C2690
Start key BAT. 12V
12k 10
+
3
FAN8903
1k 4 5 106 NTC M1 M2 11 12 Step UP F/C 13
104 4.7k
Down S/W
Up S/W 104
M1 M2
260k 474
6
A/O
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 Light sensor Q4 KSC945 Q5 Pin #8 KSR1008 Pin #7 Q6 KSR2007 R10
14
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.
www.fairchildsemi.com 3/17/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation
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.

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