Fairchild Semiconductor FAN8902 Datasheet
FAN8902(KA3902)
DC FAN Motor Controller
www.fairchildsemi.com
Features
• Built-in PWM Current Control Circuit
• Built-in 5V Regulator
• Low Supply Current
• Stalled Motor Current Limitation
• Built-in Over Voltage Protection (OVP)
• Built-in Over Current Protection (OCP)
• Built-in Load Dump Protection
• Built-in Thermal Shutdown (TSD) Circuit
• Built-in Under Voltage Lockout (UVLO) Circuit
Description
The FAN8902 is a monolithic integrated circuit, designed
for the PWM control of a DC fan motor current in an
automotive systems. It allows the fan motor speed to be
controlled linearly and efficiently.
14-DIP-300
Typical Application
• DC for Motor Control for Automotive
©2002 Fairchild Semiconductor Corporation
Ordering Information
Device Package Operating Temperature
FAN8902 14-DIP-300 -40°C ~ +90°C
Rev. 1.0.3
Pin Assignments
FAN8902(KA3902)
CMD
CMDa
CMDb
R
T
VREF
1
2
3
4
F A N 8 9 0 2
5
6
78
/ C
SG
T
CH
14
La
13
VCC
12
OUT
PG
11
CS
10
9
CL
NC
Pin Definitions
Pin Number Pin Name Pin Function Description
1 CMD Motor Current Command Input
2 CMDa Optional OP Amplifier Output
3 CMDb Optional OP Amplifier (-) Input
4 SGND Signal GND
5R
6 VREF Voltage Reference (5V)
7 CH Maximum Current Reference Input
8 NC No Connection
9 CL Minimum Current Reference Input
10 CS Motor Current Sense Voltage Input
11 PGND Power GND
12 OUT Drive Output
13 V
14 La Motor Current Maximum Reference Input
/ C
T
T
CC
Oscillator Time Constant
V
CC
2
FAN8902(KA3902)
Internal Block Diagram
Vref
CH
CMD
CL
CMDa
CMDb
6
7
1.3V
1
La
14
9
2
3
+
+
−
+
−
−
+
+
−
4R
+
−
R
Vref
+
−
PWM
Comparator
PWM
LOGIC
Oscillator
UVLO
× 5
OVP
TSD
36V
13
V
CC
12
OUT
11
PGND
10
CS
5
R
T/CT
4
SGND
3
FAN8902(KA3902)
Absolute Maximum Ratings
Parameter Symbol Value Unit
Supply Voltage V
CMD Input Voltage V
Peak Output Current I
Power Dissipation P
CC
CMD
OPK
D
32 V
6V
±0.8 A
1W
Operating Voltage
Parameter Symbol Min. Typ. Max Unit
Power Supply Voltage V
CC
9.0 12.0 32.0 V
Temperature Characteristics
Parameter Symbol Temp Value Unit
Vref Temperature Stability V
Frequency Stability F
Operating Temperature T
Storage Temperature T
ST
ST
OPR
STG
-40 ~ +90°C 200 °C
-40 ~ +90°C 20 ~ 30 °C
- -40 ~ +90 °C
- -60 ~ +150 °C
4
FAN8902(KA3902)
Electrical Characteristics
(Unless otherwise, Ta=25°C, VCC=5V, VM=12V)
Parameter Symbol Conditions Min. Typ. Max. Unit
REFERENCE
Reference Voltage Vref Iref=1mA 4.75 5.0 5.25 V
Line Regulation ∆Vref1 V
Load Regulation ∆Vref2 Iref=1mA ~ 10mA - 10 50 mV
UNDER VOLTAGE LOCKOUT (UVLO)
Start Threshold Voltage V
Threshold Hysteresis V
TH(ST)
HYS
PROTECTION
Over Voltage O
OSCILLATOR (R
=75kΩΩΩΩ, CT=1nF)
T
VP
Frequency fosc - 20 25 30 kHz
Duty Cycle Duty - 90 95 - %
CURRENT SENSING INPUT
Threshold Voltage V
TH(ST)VCMD
OUTPUT DRIVER
Output Voltage Switching Limit V
Low Output Voltage
High Output Voltage
OLIM
V
OL1
V
OL2
V
OH1
V
OH2
Rising Time Tr Cld = 1nF - 100 200 ns
Falling Time Tf Cld = 1nF - 100 200 ns
TOTAL STANDBY CURRENT
Start-up Current I
Operating Supply Current I
ST
CC
=9V ~ 32V - 50 150 mV
CC
- 7.5 8.0 8.5 V
- 1.0 1.2 1.4 V
-3336-V
= 5V 0.19 0.20 0.21 V
V
= 18V, Cld =1nF - 15 - V
CC
Iout = 20mA - - 0.4 V
Iout = 200mA - - 2.2 V
Iout = -20mA 10.0 - - V
Iout = -200mA 9.0 - - V
V
= 7V - 1.0 1.5 mA
CC
V
= 9V - 6.0 8.0 mA
CC
5
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