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| BUS IC DC/DC CONVERTER MOTOR DRIVER IC RIPPLE COUNTER Position control Position control + driver y Speed control Ripple detection DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC y Sensorless speed control of DC-motors FEATURES y y y y y y y y y y y y y y y y Supply voltage range VDD 7V to 16V Low standby current typ. 40A Speed regulation using the ripple signal of motor current Evaluation of commutation ripple signal Fully protected half bridge (slew rate, gate voltage and temperature) Overlap free PWM actuation for external power MOS half bridge Internal charge pump for 100% actuation Adjustable maximum motor voltage Conditioning of motor current for external P and ADC Watch dog with emergency function depending on the Kl. 15 signal CRASH input for emergency shutoff of pump STATUS output for failure analysis Over voltage shutdown Over temperature shutdown - 40C to + 125C operating temperature SO 24w package APPLICATION y y y Fuel and hydraulic pumps regulator Fan regulator Speed regulator The CRASH signal immediately stops the motor in case of an error. An over-temperature driver shut down is provided with appropriate TEMPFET transistors. With an integrated power supply and watch dog, an emergency function with maximum motor drive can be realized in case the C fails. The nominal motor voltage, provided by the C 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. 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 C. The filtered motor current is also buffered and provided to the C's ADC. Many types of motors can be adapted with appropriate filter design. PINNING Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 BLOCK DIAGRAM VCC E910.94 PACKAGE Name CRASH BPO VCRL OUTC INNC SHUNT VDD GND KL15 LS VMOT LSOT HSOT VBS HS VDD2 PROG1 PROG2 RIPOUT PWM PWMLP CT RT 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 CRASH BPO VCRL OUTC INNC SHUNT VDD GND KL15 LS VMOT LSOT 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 STATUS RT CT PWMLP PWM RIPOUT PROG2 PROG1 VDD2 HS VBS HSOT VBAT VS VDD VDD VREG 7V HS HSHOT CRASH STATUS KL15 Ctrl. Slewrate controlled BS VDD LS WDOG FET Driver M PWM C PWMLP PWM Gen 5k / 20kHz LSHOT VHOT R3 R4 PROG1 PROG2 RIPOUT BPO Filter & VCO SHUNT INNC R1 RSHUNT + _ RT CT VCLR OUTC R2 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 (c) 2005 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited. www.elmos.de | sales@elmos.de 50 elmos product catalog june 2005 51 |
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