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| BUS IC DC/DC CONVERTER MOTOR DRIVER IC y Fan control EC motor control Steppermotor driver RIPPLE COUNTER DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC y Fan control FEATURES y y y y y y y y y y 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 - 40C to + 125C operating temperature SO16w package Overcurrent limitation is provided as a function of the motor voltage. Over temperature protection is realized as load current reduction to achieve a minimum torque of the motor even at the temperature limit. APPLICATION y Fan regulation The sleep mode with very low standby current of typ. 50A will be activated when the control voltage "SOLL" drops below a minimum value, which can be adjusted externally. Rapid changes in control voltage are converted into smooth motor 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 voltages 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 (wont 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 (c) 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 |
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