BUS IC DC/DC CONVERTER MOTOR DRIVER IC RIPPLE COUNTER DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC ÿ Fan control EC motor control Steppermotor driver ÿ Fan control E910.16 FEATURES DESCRIPTION PINNING ÿ Supply voltage range VS 7.2V to 17.5V The IC controls the voltage across a DC fan motor as a function of ÿ Overvoltage shut down the voltage applied to the control input “SOLL”. The IC delivers the ÿ Low standby current (power down mode) gate voltage for one or two (parallel) external power-FETs, which ÿ Limitation of power dissipation by voltage linearly drive the load current of the motor. The drain currents of dependent current limitation the two external power-FETs are matched by measuring the volt- ÿ Externally adjustable minimum current ages across each individual shunt resistor. ÿ Externally adjustable over temperature protection ÿ Pin Name Description 1 MOTH Positive motor terminal MOTH 1 16 2 MOTL Negative motor terminal MOTL 2 15 3 VDD Regulator output voltage 5 V (switched off in standby) VDD 3 14 THREF 4 13 4 THREF THON 5 12 SOLL 6 11 5 THON NC 7 10 6 SOLL Input for nominal motor voltage IK 8 9 NC Not connected Reference voltage for IC activation (won`t be switched off) Threshold voltage for IC activation featuring load current reduction Rapid changes in control voltage are converted into smooth mo- Control of current distribution in 2 parallel tor current transients. 7 8 IK Voltage for maximum short circuit current of driver 9 TEMP Temperature input for power reduction 10 S2 Current sense input of slave FET 11 GND Ground connection temperature limit. 12 S1 Current sense input of master FET 13 G2 Gate control of slave FET The sleep mode with very low standby current of typ. 50µA will 14 COMP Feedback input of motor voltage regulation 15 G1 Gate control of master FET 16 VS Supply voltage power-FETs ÿ Turn on the power-FETs during load-dump Overcurrent limitation is provided as a function of the motor volt- ÿ – 40°C to + 125°C operating temperature age. Over temperature protection is realized as load current re- ÿ SO16w package duction to achieve a minimum torque of the motor even at the APPLICATION ÿ PACKAGE Fan regulation be activated when the control voltage “SOLL” drops below a minimum value, which can be adjusted externally. BLOCK DIAGRAM VS G1 COMP G2 S1 GND S2 TEMP VBAT VBAT VS VDD VSOLL MOTH VDD Regulator Motor Voltage Sense SOLL THREF Threshold Limiter M MOTL COMP UTHON VDD TEMP Temp. Limit Motor control G1 MOSFET Driver G2 Current Sense S2 VDD IK 38 Short Circuit Current Set S1 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 | [email protected] elmos product catalog june 2005 39