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FAN8404D
2 Phase Half Wave BLDC Motor Driver
Features
* * * * * * * A wide range of operation voltage: 4V to 15V Built-in motor lock detector. Automatic restart function Alarm output for a motor lock detection Built-in thermal shut down circuits Built-in reverse current protection diode Compact package: 8-SOP-225
Description
The FAN8404D is a monolithic integrated circuit, and suitable for DC cooling fan motors.
8-SOP-225
1
Typical Applications
* DC cooling fan motor
Ordering Information
Device FAN8404D FAN8404DTF Package 8-SOP-225 8-SOP-225 Operating Temp. -25C ~ 85C -25C ~ 85C
Rev.1.0.3
(c)2002 Fairchild Semiconductor Corporation
FAN8404D
Block Diagram
OUTB
1
3
LD
2 Commutation & Control & TSD
AL
OUTA
7
VCC GND
4 5 6 IN+ IN-
8
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 Pin Name OUTB AL LD VCC IN+ IN- OUTA GND I/O O O I I O Pin Function Description Motor output B Alarm output Triangle pulse generator for lock detector and automatic restart Supply voltage Hall input + Hall input - Motor output A Ground Remark Open Collector -
2
FAN8404D
Equivalent Circuits
Description OUTB OUTA Pin No. 1 7
1 7 Commutation
Internal Circuit
AL
2
2 Lock detector
LD
3
3 Lock detector & Automatic restart
Commutation
VLDCP
VLDCL
IN+ IN-
5 6
5 6 Commutation
3
FAN8404D
Absolute Maximum Ratings (Ta = 25C)
Parameter Maximum power supply voltage Maximum power dissipationnote1 Thermal resistancenote1 Maximum output voltage Maximum output current Alarm output current Alarm output withstanding voltage Maximum hall input AC level Operating temperature Storage temperature Symbol VCCMAX PDMAX JA VOMAX IOMAX IAL VAL VHACMAX TOPR TSTG Value 18 429note2 620note3 291.61note2 201.52note3 30 1.2note4 10 36 6 -25 ~ 85 -55 ~ 150 Unit V mW C/W V A mA V V C C
Note1: PCB Condition: Thickness (1.6mm), Dimension (76.2mm * 114.3mm) Refer: EIA/J SED 51-3 & EIA/J SED 51-7 Note2: Air condition (0m/s) Note3: Air condition (3m/s) Note4: Should not exceed PD or ASO value
Power Dissipation Curve (Air condition = 0m/s)
0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 20 40 60 80 Tc or Ta[C] 100 120 140 160
4
Pd[W]
FAN8404D
Air Speed & JA
350 300 JA[C/W] 250 200 150 100 50 0 0 1 2 3 Air Speed[m/s] 4 5 6
Recommended Operating Conditions (Ta = 25C)
Parameter Function compensation operating voltage Symbol VCC Min. 4.0 Typ. - Max. 15.0 Unit V
Electrical Characteristics
(Ta=25C, VCC=12V unless otherwise specified) Parameter Supply current Lock detector charging current Lock detector discharging current Lock detector charging/discharging ratio Lock detector capacitor clamp voltage Lock detector capacitor comparator voltage Output low level voltage Output leakage current Output zener voltage Alarm output pin low level voltage Alarm output pin leakage current Hall input DC range Hall Input Offset Symbol ICC ILDC ILDD RCD VLDCL VLDCP VOL IOL VOZ VALL IALL VHDC VHOF IO=10mA VREF=6V IO=200mA Clamp current=10mA Conditions When output is off. VLD=1.8V VLD=1.8V RCD=ILDC/ILDD Min. 2.38 0.48 3.0 2.4 0.7 28 1 -10 Typ. 3.40 0.68 5.0 2.85 0.99 0.9 0 30 0.2 0 Max. 3.0 4.42 0.88 7.0 3.3 1.2 1.2 10 32 0.5 10 VCC2V 10 Unit mA A A - V V V A V V A V mV
5
FAN8404D
Application Information
1. Lock Detection & Automatic Restart
Hall Input Output VLDCL VLDCP AL Motor lock detected Motor lock Motor lock cleared Motor restart
TOFF
TON
FAN8404D features a lock detection and an automatic restart. The functions can be operated as follows. 1) When the hall signal stop switching, a motor can be locked. 2) The voltage, VLD on pin 3, is increasing until it reaches VLDCL. 3) When the voltage, VLD reaches VLDCL, the alarm output (AL) becomes high as a motor lock has been detected. 4) If LD pin is connected to GND, the lockup protection is disabled. 5) While a motor is locked, the output repeats switching ON / OFF, but the other output is always OFF. The switching time can be determined by an external capacitor on charging / discharging time of the capacitor, switching ON / OFF time can be calculated as follows.
x (V - VLDCP ) C LD LDCL T ON = -----------------------------------------------------------------------I LDC T OFF C x (V - VLDCP ) LD LDCL = -----------------------------------------------------------------------I LDD
Where, The CLD is an external capacitor connected to pin 3, LD. The VLDCL is the clamp voltage on pin 3, LD. The VLDCP is the comparator voltage on pin 3, LD. The ILDC is the charging current on pin 3, LD. The ILDD is the dischaging current on pin 3, LD.
2. Thermal Shut Down
TSD On: All the outputs are off.(Typ. 175C) TSD Off: The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150C)
6
FAN8404D
3. Hall Amplifier Input Block
VCC
R1
IN+ 5
C1
FAN8404D
6
C2
R2
IN-
Hall Sensor
R3
The hall current (IH) is determined by R1, R2 and R3.
V CC I H = -----------------------------------R1 + R2 + R3
Where, the R2 is the impedance of hall sensor. An external capacitor, C1, can be used to reduce a power supply noise. In addition, C2 is to remove a noise which is caused in case the line is long from the hall sensor output to the hall input (pin 5 / 6) of the device. The input bias voltage of hall amplifier is between 1V and VCC-2V as following figure.
VCC VCC-2V VCC / 2
1V GND
It is recommended that R1 and R3 should have the same value to make the output signal of hall sensor centered as VCC/2.
7
FAN8404D
Operation Truth Table
IN+ High Low INLow High OUTA High Low OUTB Low High
Test Circuits
VCC
1K
50
50
1
OUTB
GND
8
2
AL
OUTA
7
ILDC / ILDD A 3 LD IN6
VLD 4 A ICC VCC VCC IN+ 5
8
FAN8404D
Typical Application Circuits
LD 1 OUTB 3
2 Commutation & Control & TSD AL
7 OUTA
VCC VCC 4 IN+ 8 GND 5 Hall 6 IN-
Precaution
In case of improper connection (change between power and ground), diodes are required to protect motor.
9
FAN8404D
Package Dimensions (Unit: mm)
8-SOP-225
10
FAN8404D
11
FAN8404D
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 10/17/02 0.0m 001 Stock#DSxxxxxxxx 2002 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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