1、L298May 1995LOW SATURATION VOLTAGE.OVERTEMPERATURE PROTECTION.OPERATING SUPPLY VOLTAGE UP TO 46 V TOTAL DC CURRENT UP TO 4 A.LOGICAL ”0” INPUT VOLTAGE UP TO 1.5 V (HIGH NOISE IMMUNITY)DESCRIPTIONThe L298 is an integrated monolithic circuit in a 15- lead Multiwatt and PowerSO20 packages. It is a high

2、 voltage, high current dual full-bridge driver de- signed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Two enableinputs are provided to enableor disable thedevice independentlyofthe in- put signals. The emitters of the lower transis

3、tors of each bridge are connected together and the corre- sponding external terminal can be used for the con-BLOCK DIAGRAMDUAL FULL-BRIDGE DRIVERMultiwatt15PowerSO20ORDERING NUMBERS : L298N (Multiwatt Vert.)L298HN (Multiwatt Horiz.) L298P (PowerSO 20)nection of anexternal sensingresistor. An additio

4、nal supply input is provided so that the logic works at a lower voltage.1/12L298ABSOLUTE MAXIMUM RATINGSSymbolParameterValueUnitVSPower Supply50VVSSLogic Supply Voltage7VVI,VenInput and Enable Voltage0.3 to 7VIOPeak Output Current (each Channel) Non Repetitive (t = 100ms)3ARepetitive (80% on 20% off

5、; ton = 10ms)2.5ADC Operation2AVsensSensing Voltage1 to 2.3VPtotTotal Power Dissipation (Tcase = 75C)25WTstg, TjStorage and Junction Temperature40 to 150C15CURRENT SENSING B14OUTPUT 413OUTPUT 312INPUT 411ENABLE B10INPUT 39LOGIC SUPPLY VOLTAGE VSS8GND7INPUT 16ENABLE A5INPUT 14SUPPLY VOLTAGE VS3OUTPUT

6、 22OUTPUT 11CURRENT SENSING AD95IN240PIN CONNECTIONS (top view)Multiwatt15TAB CONNECTED TO PIN 8GND120GNDSense A219Sense BN.C.318N.C.Out 1417Out 4Out 25PowerSO2016Out 3VS615Input 4Input 1714Enable BEnable A813Input 3Input 2912VSSGND1011GNDD95IN239THERMAL DATASymbolParameterPowerSO20Multiwatt15UnitRt

7、h j-caseThermal Resistance Junction-caseMax.3 C/WRth j-ambThermal Resistance Junction-ambientMax.13 (*)35 C/W2/12(*) Mounted on aluminum substratePIN FUNCTIONS (refer to the block diagram)MW.15PowerSONameFunction1;152;19Sense A; Sense BBetween this pin and ground is connected the sense resistor toco

8、ntrol the current of the load.2;34;5Out 1; Out 2Outputs of the Bridge A; the current that flows through the loadconnected between these two pins is monitored at pin 1.46VSSupply Voltage for the Power Output Stages.A non-inductive 100nF capacitor must be connected between thispin and ground.5;77;9Inp

9、ut 1; Input 2TTL Compatible Inputs of the Bridge A.6;118;14Enable A; Enable BTTL Compatible Enable Input: the L state disables the bridge A(enable A) and/or the bridge B (enable B).81,10,11,20GNDGround.912VSSSupply Voltage for the Logic Blocks. A100nF capacitor must beconnected between this pin and

10、ground.10; 1213;15Input 3; Input 4TTL Compatible Inputs of the Bridge B.13; 1416;17Out 3; Out 4Outputs of the Bridge B. The current that flows through the loadconnected between these two pins is monitored at pin 15.3;18N.C.Not ConnectedELECTRICAL CHARACTERISTICS (VS = 42V; VSS = 5V, Tj = 25C; unless

11、 otherwise specified)SymbolVSParameterSupply Voltage (pin 4)Test ConditionsOperative ConditionMin.VIH +2.5Typ.Max.46UnitVVSSLogic Supply Voltage (pin 9)4.557VISQuiescent Supply Current (pin 4)Ven = H; IL = 0Vi = L1322mAVi =H5070mAVen =LVi =X4mAISSQuiescent Current from VSS (pin 9)Ven = H; IL = 0Vi =

12、 L2436mAVi =H712mAVen =LVi =X6mAViLInput Low Voltage (pins 5, 7, 10, 12)0.31.5VViHInput High Voltage (pins 5, 7, 10, 12)2.3VSSVIiLLow Voltage Input Current (pins 5, 7, 10, 12)Vi = L10mAIiHHigh Voltage Input Current (pins 5, 7, 10, 12)Vi = H VSS 0.6V30100mAVen = LEnable Low Voltage (pins 6, 11)0.31.5

13、VVen = HEnable High Voltage (pins 6, 11)2.3VSSVIen = LLow Voltage Enable Current (pins 6, 11)Ven = L10mAIen = HHigh Voltage Enable Current (pins 6, 11)Ven =H VSS 0.6V30100mAVCEsat (H)Source Saturation VoltageIL = 1A1.351.7VIL = 2A22.7VVCEsat (L)Sink Saturation VoltageIL = 1A (5)1.21.6VIL = 2A (5)1.7

14、2.3VVCEsatTotal DropIL = 1A (5)3.2VIL = 2A (5)4.9VVsensSensing Voltage (pins 1, 15)1 (1)2V3/12ELECTRICAL CHARACTERISTICS (continued)SymbolParameterTest ConditionsMin.Typ.Max.UnitT1 (Vi)Source Current Turn-off Delay0.5 Vi to 0.9 IL(2); (4)1.5msT2 (Vi)Source Current Fall Time0.9 IL to 0.1 IL(2); (4)0.

15、2msT3 (Vi)Source Current Turn-on Delay0.5 Vi to 0.1 IL(2); (4)2msT4 (Vi)Source Current Rise Time0.1 IL to 0.9 IL(2); (4)0.7msT5 (Vi)Sink Current Turn-off Delay0.5 Vi to 0.9 IL(3); (4)0.7msT6 (Vi)Sink Current Fall Time0.9 IL to 0.1 IL(3); (4)0.25msT7 (Vi)Sink Current Turn-on Delay0.5 Vi to 0.9 IL(3);

16、 (4)1.6msT8 (Vi)Sink Current Rise Time0.1 IL to 0.9 IL(3); (4)0.2msfc (Vi)Commutation FrequencyIL = 2A2540KHzT1 (Ven)Source Current Turn-off Delay0.5 Ven to 0.9 IL(2); (4)3msT2 (Ven)Source Current Fall Time0.9 IL to 0.1 IL(2); (4)1msT3 (Ven)Source Current Turn-on Delay0.5 Ven to 0.1 IL(2); (4)0.3msT

17、4 (Ven)Source Current Rise Time0.1 IL to 0.9 IL(2); (4)0.4msT5 (Ven)Sink Current Turn-off Delay0.5 Ven to 0.9 IL(3); (4)2.2msT6 (Ven)Sink Current Fall Time0.9 IL to 0.1 IL(3); (4)0.35msT7 (Ven)Sink Current Turn-on Delay0.5 Ven to 0.9 IL(3); (4)0.25msT8 (Ven)Sink Current Rise Time0.1 IL to 0.9 IL(3);

18、 (4)0.1msfc (Ven)Commutation FrequencyIL = 2A1KHz1) 1)Sensing voltage can be 1 V for t 50 msec; in steady state Vsens min 0.5 V.2) Seefig. 2.3) Seefig. 4.4) The load must be a pure resistor.5) PIN 1 and PIN 15 connected to GND.Figure 1 : Typical Saturation Voltage vs. Output Current.Figure 2 : Switc

19、hing Times Test Circuits.4/12Note : For INPUT Switching, set EN = H For ENABLE Switching, set IN = HFigure 3 : Source Current Delay Times vs. Input or Enable Switching.Figure 4 : Switching Times Test Circuits.Note : For INPUT Switching, set EN = H For ENABLE Switching, set IN = L5/126/12Figure 5 : S

20、ink Current Delay Times vs. Input 0 V Enable Switching.Figure 6 : Bidirectional DC Motor Control.InputsFunctionVen = HC = H ; D = LTurn RightC = H ; D = HTurn LeftC = DFast Motor StopVen = LC = X ; D = CFree Running Motor StopL = LowH = HighX = Dont careFigure 7 : For higher currents, outputs can be

21、 paralleled. Take care to parallel channel 1 with channel 4 and channel 2 with channel 3.APPLICATION INFORMATION (Refer to the block diagram)1.1. POWER OUTPUT STAGEThe L298integratestwo power outputstages(A; B). The power output stage is a bridge configuration and its outputs can drive an inductive

22、load in com- mon or differenzial mode, dependingon 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 ; RSB.) allows to detect the in- tensity of this current.1.2. INPUT STAGEEach bridge is driven by means of fou

23、r gates the in- put of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB. The In inputsset the bridge state when The En input is high ; alow stateof the En input inhibitsthe bridge. All the inputsare TTL compatible.2. SUGGESTIONSA non inductive capacitor, usually of 100 nF, must be foreseen between both

24、 Vs and Vss, to ground, as near as possible to GND pin. When the large ca- pacitor of the power supply is too far from 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 near the GND pin

25、 of the I.C.Each input must be connected to the source of the driving signals by means of a very short path.Turn-On and Turn-Off : Before to Turn-ON the Sup- ply Voltageand before to Turn it OFF, the Enable in- put must be driven to the Low state.3. APPLICATIONSFig 6 shows a bidirectional DC motor c

26、ontrol 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 200 nsec) that must be chosen of a VF as low as possible at the worst case of the loadcurrent.The sense output voltage can be used to control the current

27、 amplitude by chopping the inputs, or to 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 higher than 2 Amps, a

28、 paralleled configura- tion can be chosen (See Fig.7).An external bridge of diodes are required when in- ductive loads are driven and when the inputs of the IC are chopped; Shottkydiodes would bepreferred.7/12This solution can drive until 3 Amps In DCoperation and until 3.5 Amps of a repetitive peak

29、 current.On Fig 8it is shownthedriving of a two phasebipolar stepper motor ; the needed signals to drive the in- puts of the L298 are generated, in this example, from the ICL297.Fig 9 shows an example of P.C.B. designed for the application of Fig 8.Figure 8 : Two Phase Bipolar Stepper Motor Circuit.

30、Fig 10 shows a second two phase bipolar stepper motor control circuit where the current is controlled by the I.C. L6506.This circuit drives bipolar stepper motors with winding currents up to 2 A. The diodes are fast 2 A types.8/12RS1 = RS2 = 0.5 WD1 to D8 = 2 A Fast diodes VF 1.2 V I = 2 Atrr 200 ns

31、Figure 9 : Suggested Printed Circuit Board Layout for the Circuit of fig. 8 (1:1 scale).Figure 10 : Two Phase Bipolar Stepper Motor Control Circuit by Using the Current Controller L6506.RR and Rsense depend from the load current9/1210/12MULTIWATT15 (VERTICAL) PACKAGE MECHANICAL DATADIM.MIN.TYP.MAX.M

32、IN.TYP.MAX.A50.197B2.650.104C1.60.063D10.039E0.490.550.0190.022F0.660.750.0260.030G1.141.271.40.0450.0500.055G117.5717.7817.910.6920.7000.705H119.60.772H220.20.795L22.122.60.8700.890L12222.50.8660.886L217.6518.10.6950.713L317.2517.517.750.6790.6890.699L410.310.710.90.4060.4210.429L72.652.90.1040.114

33、M4.24.34.60.1650.1690.181M14.55.085.30.1770.2000.209S1.92.60.0750.102S11.92.60.0750.102Dia13.653.850.1440.152mminchPowerSO20 PACKAGE MECHANICAL DATADIM.MIN.TYP.MAX.MIN.TYP.MAX.A3.600.1417a10.100.300.00390.0118a23.300.1299a300.1000.0039b0.400.530.01570.0209c0.230.320.0090.0126D (1)15.8016.000.62200.6

34、299E13.9014.500.54720.570e1.270.050e311.430.450E1 (1)10.9011.100.42910.437E22.900.1141G00.1000.0039h1.10LN0.801.100.031410 (max.)0.0433S8 (max.)T10.00.3937mminch(1) ”D and E1” do not include mold flash or protrusions- Mold flash or protrusions shall not exceed 0.15mm (0.006”)NNRbDETAIL Ae3a2Aeca1DETAIL BEDleadDETAIL A2011a3DETAIL BslugE2h