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by: Sam Robel


Sam Robel
GPA 3.68


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Class Notes
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This 13 page Class Notes was uploaded by Sam Robel on Monday October 19, 2015. The Class Notes belongs to ECE 441 at Oregon State University taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/224426/ece-441-oregon-state-university in Engineering Electrical & Compu at Oregon State University.

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Date Created: 10/19/15
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VS LOUM 2cm ltspvdlt 1 quot SJ ArmO 47 7 L 4mii mwii4gg gg Ng 7 L93 r w 3 395 3 e 1 Hmcvmmmm pa aw hiding 1 L mw ec 3 acid quot314 103 gt WWW umwwww in as o 7805 m M VWNW 3 6E 14 V50 957 7 Eu 392 w W v52 V D ns v54 SO MSpkoA 39 7 LSV 0 Mrs no Auk 39 abg 39 huui ts mgmockb a i t L Q A Mime30V 39 A430 ORE PE V LgersLSOQ l I 0 7 70 RAS c A J WW 1 0ij poSamp C MpJquot gtw m r r r in V Poii QOAFJ 130 1 a m A um W M MAW N WUMWN mes c Ov h 39 W93o igtpu i gtT EN Eff 3ul 71 S mgjo UCLJZ Ha m 7 M MW ML QMO mal mgga L298 ABSOLUTE MAXIMUM RATINGS Output Current each Channel Non Repetitive t 100us on 20 off ton 10ms T and JunctionT PIN CONNECTIONS top view 25 25 to 130 40 to 150 TAB CONNECTED TO PM E Power5020 0le 1395mm DA LILIIJLIIJLILILILI CUPPENT SENSING B OUTPUT4 OUTPUT 3 iNPUT 4 ENABLE B iNPUT 3 LOGIC SUPPLY VOLTAGE V55 3ND INPUT 2 ENABLEA iNPUT i SUPPLY VOLTAGE VS 0 C A U C A N OUTPUTi CUPPENT SENSING A THERMAL DATA I Symbol I Parameter I Rmrcage IThermaI Resistance Junctioncase I Rthiramb IThermaI Resistance Junctionambient Mounted on aluminum substrate 213 Max MaxI Power5020 I Multiwatt15 I Unit I 3 CIW 13 35 I CIW I 7 L298 PIN FUNCTIONS referto the block diagram MW15 PowerSO Name Function 115 219 Sense A Sense B Between this pin and ground is connected the sense resistor to control the current ofthe load 23 45 Out 1 Out 2 Outputs of the Bridge A the current that flows through the load connected between these two pins is monitored at pin 1 4 6 Vs Supply Voltage for the Power Output Stages A noninductive 100nF capacitor must be connected between this pin and ground 57 79 Input 1 Input 2 I39I39L Compatible Inputs of the Bridge A 611 814 Enable A Enable B I39I39L Compatible Enable Input the L state disables the bridge A enable A andorthe bridge B enable B 8 1101120 GND Ground 9 12 VSS Supply Voltage for the Logic Blocks A100nF capacitor must be connected between this pin and ground 10 12 1315 Input 3 Input 4 I39I39L Compatible Inputs of the Bridge B 13 14 1617 Out 3 Out 4 Outputs of the Bridge B The current that flows through the load connected between these two pins is monitored at pin 15 318 NC Not Connected ELECTRICAL CHARACTERISTICS Vs 42V Vss 5V 25 C unless otherwise specified Supply Currentpin 4 Current from Vss Pin 9 Voltage Current H S V55 06V Enable Current len H Enable Current H g V55 06V chgai H Saturation Voltage A chgai L Saturation Voltage A VCEsat otal Drop 7 313 L29 8 ELECTRICAL CHARACTERISTICS continued Parameter Test Conditions Current Turnoff V to 09 IL Current Fall Time to 01 Current Turnon to 01 Current Rise Time 1 to 09 CurrentT to 09 Current Fall Time to 01 Current Turnon to 09 Current Rise Time 1 IL to 09 IL 2A Current Turnoff Ven to 09 IL Current Fall Time to 01 Current Turnon Ven to 01 IL Current Rise Time 1 to 09 CurrentT to 09 Current Fall Time to 01 Current Turnon to 09 T8 Current Rise Time 1 IL to 09 IL 1 1Sensing voltage can be 1 V fort S 50 usec in steady state Vsens min 2 05 V 2 See g 2 3 See g 4 4 The load must be a pure resistor Figure 1 Typical Saturation Voltage vs Output Figure 2 Switching Times Test Circuits Current vssal v5th I I SSIu 0 04 08 12 16 20 2 lo Note For INPUT Sititching set EN H For ENABLE Switching set IN H 413 7 Figure 3 Source Current Delay Times vs Input or Enable Switching L298 Li lmaxizA IO I sum r veni 14V 5039 I 5 5 2 Figure 4 Switching Times Test Circuits Vsssv Vs IV O O ENABLE C 5435 Note For INPUT SNitching set EN H For ENABLE Switching set IN L 513 L298 Figure 5 Sink Current Delay Times vs Input 0 V Enable Switching 39L Inna1A 9039 v Av 50quot lull SO39I Figure 6 Bidirectional DC Motor Control 0V5 WOHF DI A n M I m m 0 Iro Inputs Function VenH CHDL Forward as i u l C L D H Reverse n J55 C D Fast Motor Stop Io VenL CX DX Free Running 3 In MotorStop III LZBBN 39 LOW H High X Don t care II 0vquot to com m 395 i fl 0 Bl 390 MHA FAST RECOVERV MENquot omens ssum 613 7 L298 Figure 7 For higher currents outputs can be paralleled Take care to parallel channel 1 with channel 4 and channel 2 with channel 3 APPLICATION INFORMATION Refer to the block diagram 11 POWER OUTPUT STAGE The L298 integratestwo poweroutput stages A B The power output stage is a bridge configuration and its outputs can drive an inductive load in com mon or differenzial mode depending on the state of the inputs The current that flows through the load comes out from the bridge at the sense output an external resistor RSA R33 allows to detectthe in tensity of this current 12 INPUT STAGE Each bridge is driven by means of four gates the in put of which are n1 ln2 EnA and ln3 ln4 EnB The In inputs set the bridge state when The En input is high a low state ofthe En input inhibits the bridge All the inputs are TTL compatible 2 SUGGESTIONS A non inductive capacitor usually of 100 nF must be foreseen between both Vs and Vss to ground as near as possible to GND pin When the large ca pacitor of the power supply istoo farfrom the IC a second smaller one must be foreseen near the L298 The sense resistor not of a wire wound type must be grounded near the negative pole of Vs that must be nearthe GND pin ofthe C 7 Each input must be connected to the source of the driving signals by means of a very short path TurnOn and TurnOff Before to TurnON the Sup ply Voltage and before to Turn it OFF the Enable in put must be driven to the Low state 3 APPLICATIONS Fig 6 shows a bidirectional DC motor control Sche matic Diagram for which only one bridge is needed The external bridge of diodes D1 to D4 is made by four fast recovery elements trr s 200 nsec that must be chosen of a VF as low as possible at the worst case ofthe load current The sense output voltage can be used to control the current amplitude by chopping the inputs orto pro vide overcurrent protection by switching low the en able input The brake function Fast motor stop requires that the Absolute Maximum Rating of 2 Amps must never be overcome When the repetitive peak current needed from the load is higherthan 2 Amps a paralleled configura tion can be chosen See Fig7 An external bridge of diodes are required when in ductive loads are driven and when the inputs of the IC are chopped Shottky diodeswould be preferred 713 L298 This solution can drive until 3 Amps In DC operation Fig 10 shows a second two phase bipolar stepper and until 35 Amps of a repetitive peak current motor control circuit where the current is controlled On Fig 8 it is shown the driving ofa two phase bipolar by the LO L650639 stepper motor the needed signals to drive the in puts of the L298 are generated in this example from the IC L297 Fig 9 shows an example of PCB designed for the application of Fig 8 Figure 8 Two Phase Bipolar Stepper Motor Circuit This circuit drives bipolar stepper motors with winding currents up to 2 A The diodes are fast 2 A types STE quotan norm wmmnas S SBLSIL R51 R52 05 Q Vpg12Vl2A D1 to D82AFast diodes mgzoo n5 813 7 Figure 9 Suggested Prmted Orcmt Board Layout forthe Orcmt of g 8 1 1 soa e L298 camps ET Z 2 xxx 0 X Y 1 C O P O 39 I emu v m 04 ow Figure10 V 1W m x Lssos L298 Information furnished is believed to be accurate and reliable However STMicroelectronics assumes no responsibility for the conse se of such information nor for any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics Speci cation mentioned in this publication are subject to change without notice This publication supersedes and replaces all information previously supplied STMi croelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics Printed in Italy All Rights Reserved TMicroelectronics GROUP OF COMPANIES Australia Brazil China Finland France Germany Hong Kong lndia ltaly Japan Malaysia Malta Morocco Singapore Spain Sweden SNitzerland United Kingdom USA httpwwwstcom m 1313


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