E910.94 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Sensorless speed control of DC-motors

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
Position control
Position control + driver
ÿ Speed control
Ripple detection
ÿ Sensorless speed control of DC-motors
FEATURES
ÿ Supply voltage range VDD 7V to 16V
ÿ Low standby current typ. 40µA
ÿ Speed regulation using the ripple signal of
motor current
ÿ Evaluation of commutation ripple signal
ÿ Fully protected half bridge
(slew rate, gate voltage and temperature)
ÿ Overlap free PWM actuation for external
power MOS half bridge
ÿ Internal charge pump for 100% actuation
ÿ Adjustable maximum motor voltage
ÿ Conditioning of motor current for external
µP and ADC
ÿ Watch dog with emergency function depending
on the Kl. 15 signal
ÿ CRASH input for emergency shutoff of pump
ÿ STATUS output for failure analysis
ÿ Over voltage shutdown
ÿ Over temperature shutdown
ÿ – 40°C to + 125°C operating temperature
ÿ SO 24w package
DESCRIPTION
The IC is designed to control the speed of DC-motors. In order
to determine the motor speed the commutation-related ripple
of the motor current is evaluated and converted to a 5V digital
signal for the µC. The filtered motor current is also buffered and
provided to the µC’s ADC. Many types of motors can be adapted
with appropriate filter design.
The nominal motor voltage, provided by the µC is converted into a
20kHz PWM signal used to drive the power MOS half bridge. Duty
cycle of 100% is possible due to an implemented charge pump.
The CRASH signal immediately stops the motor in case of an error.
An over-temperature driver shut down is provided with appropri-
ate TEMPFET transistors. With an integrated power supply and
watch dog, an emergency function with maximum motor drive
can be realized in case the µC fails.
APPLICATION
ÿ Fuel and hydraulic pumps regulator
ÿ Fan regulator
ÿ Speed regulator
BLOCK DIAGRAM
50
VBAT
VCC
µC
VS
VDD
CRASH
STATUS
KL15
PWM
PWMLP
PROG1
PROG2
RIPOUT
BPO
VREG
7V
WDOG
Filter
&
VCO
Ctrl.
PWM Gen
5k / 20kHz
RT
CT
VCLR
OUTC
Slewrate
controlled
FET
Driver
VDD
HS
HSHOT
BS
LS
LSHOT
VHOT
VDD
R3
R4
SHUNT
INNC
R1
R2
M
RSHUNT
DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
PINNING
Pin Name
1 CRASH
2 BPO
3 VCRL
4 OUTC
5 INNC
6 SHUNT
7 VDD
8 GND
9 KL15
10 LS
11 VMOT
12 LSOT
13 HSOT
14 VBS
15 HS
16 VDD2
17 PROG1
18 PROG2
19 RIPOUT
20 PWM
21 PWMLP
22 CT
23 RT
24 STATUS
Description
Digital input crash signal
Bandpass output
VCO control voltage
Current amplifier output
Current amplifier, inverting input
Current amplifier, non-inverting input
5 V voltage control output
Ground
Signal input Kl. 15
Gate output for low side driver
Input motor voltage
Over voltage control of low side driver
Over voltage control of high side driver
I/O for bootstrap voltage
Gate output for high side driver
Positive supply voltage, battery voltage
Programming of filter gain
Programming of filter gain
Digital output ripple signal
PWM input motor target value
Pin for PWM lowpass capacitor
Timing capacitor for VCO
Timing resistor for VCO
Digital output for status signal
E910.94
PACKAGE
CRASH
1
BPO
2
VCRL
3
OUTC
4
INNC
5
SHUNT
6
VDD
7
GND
8
KL15
9
LS
10
VMOT
11
LSOT
12
24
STATUS
23
RT
22
CT
21
PWMLP
20
PWM
19
RIPOUT
18
PROG2
17
PROG1
16
VDD2
15
HS
14
VBS
13
HSOT
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.
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elmos product catalog june 2005
51