T911.45

BUS IC DC/DC CONVERTER MOTOR DRIVER IC RIPPLE COUNTER Position control Position control + driver Speed control ÿ Ripple detection DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC ÿ Ripple detection IC FEATURES ÿ ÿ ÿ ÿ ÿ ÿ ÿ ÿ ÿ ÿ Supply voltage VDD 4.75V to 5.25V High voltage input for motor voltage sensing Variable SC filter for high noise immunity controlled by motor voltage and current Hysteresis comparator with adaptive thresholds for min and max detection Adjustable filter gain to match motor ripple amplitude Logic level ripple output Low operating current (typ. 3mA ) Few components to adjust motor type – 40°C to + 125°C operating temperature SO14n package The ripple signal is available on an output pin to connect controllers or dedicated logic. The IC can be adapted to different motor characteristics by changing the RC-filter and the voltage divider. The resonant frequency of the variable band pass filter is auto matically set close to the expected ripple frequency by measuring both, motor voltage and current. Thus for all disturbing frequencies generated by the power supply, the motor drive circuit and the motor itself, good noise reduction is obtained. To optimize the filter characteristics the gain can be programmed between 3 and 12. DESCRIPTION The IC detects the commutation ripple of a DC motor in speed sensing or positioning systems. system evaluation chip PINNING Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name RIPOUT DGND SHUNT INNC OUTC VCRL AGND VMOT BPO RT CT PROG1 VDD PROG2 Description Ripple output Digital ground Current sense input Inverting input of current amplifier Current amplifier output Test output for VCO control voltage before filtering Analog ground Motor voltage input Test output for SC bandpass filter output signal VCO pin for external timing resistor VCO pin for external timing capacitor Programming input 1 for gain adjust of bandpass filter 5V supply Programming input 2 for gain adjust of bandpass filter AVAILABILITY Samples Series RIPOUT DGN D SHUNT INNC OUTC VCRL AGND 1 2 3 4 5 6 7 T911.45 PACKAGE 14 13 12 11 10 9 8 PROG2 VDD PROG1 CT RT BPO VMOT available tbd. APPLICATION ÿ ÿ Seat-, mirror- and other positioning systems Pump-, fan- and other speed control systems BLOCK DIAGRAM VDD BPO VDD RPROT VBAT VMOT PROG 1 PROG 2 µC Filter & VCO RIPOUT RT CT GND DGND VCRL OUTC R1 R2 52 + _ + M _ SHUNT INNC RLP1 CLP1 RLP2 CLP2 RSHUNT 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. w ww.elmos.de | sales@elmos.de elmos product catalog june 2005 53