BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
ÿ
Fan control
EC motor control
Steppermotor driver
RIPPLE COUNTER
DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
ÿ
Fan control
FEATURES
ÿ
ÿ
ÿ
ÿ
ÿ
ÿ
ÿ
ÿ
ÿ
ÿ
Supply voltage range VS
7.2V
to
17.5V
Overvoltage shut down
Low standby current (power down mode)
Limitation of power dissipation by voltage
dependent current limitation
Externally adjustable minimum current
Externally adjustable over temperature protection
featuring load current reduction
Control of current distribution in
2
parallel
power-FETs
Turn on the power-FETs during load-dump
–
40°C
to +
125°C
operating temperature
SO16w package
Overcurrent limitation is provided as a function of the motor volt-
age. Over temperature protection is realized as load current re-
duction to achieve a minimum torque of the motor even at the
temperature limit.
APPLICATION
ÿ
Fan regulation
The sleep mode with very low standby current of typ.
50µA
will
be activated when the control voltage “SOLL” drops below a mini-
mum value, which can be adjusted externally.
Rapid changes in control voltage are converted into smooth mo-
tor current transients.
DESCRIPTION
The IC controls the voltage across a DC fan motor as a function of
the voltage applied to the control input “SOLL”. The IC delivers the
gate voltage for one or two (parallel) external power-FETs, which
linearly drive the load current of the motor. The drain currents of
the two external power-FETs are matched by measuring the volt-
ages across each individual shunt resistor.
PINNING
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
MOTH
MOTL
VDD
THREF
THON
SOLL
NC
IK
TEMP
S2
GND
S1
G2
COMP
G1
VS
Description
Positive motor terminal
Negative motor terminal
Regulator output voltage
5
V (switched off in standby)
Reference voltage for IC activation
(won`t be switched off)
Input for nominal motor voltage
Not connected
Voltage for maximum short circuit current of driver
Temperature input for power reduction
Current sense input of slave FET
Ground connection
Current sense input of master FET
Gate control of slave FET
Feedback input of motor voltage regulation
Gate control of master FET
Supply voltage
MOTH
MOTL
VDD
THREF
THON
SOLL
NC
IK
1
2
3
4
5
6
7
8
E910.16
PACKAGE
16
15
14
13
12
11
10
9
VS
G1
COMP
G2
S1
GND
S2
TEMP
Threshold voltage for IC activation
BLOCK DIAGRAM
VBAT
VS
MOTH
VBAT
VDD
VDD
Regulator
VSOLL
SOLL
Motor
Voltage
Sense
M
MOTL
COMP
THREF
Threshold
Limiter
Motor
control
MOSFET
Driver
UTHON
G1
G2
VDD
TEMP
Temp.
Limit
Short
Circuit
Current Set
VDD
IK
Current
Sense
S1
S2
Note
ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any
circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication
has been checked, no responsibility, however, is assumed for inaccuracies. ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of
the product can reasonably be expected to cause failure of a life-support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications.
Copyright ©
2005
ELMOS
Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.
www.elmos.de | sales@elmos.de
38
elmos product catalog june
2005
39
ELMOS [ ELMOS SEMICONDUCTOR AG ]
