L298
DUAL FULL-BRIDGE DRIVER
. . .LOW . .
OPERATING SUPPLY VOLTAGE UP TO 46 V TOTAL DC CURRENT UP TO 4 A SATURATION VOLTAGE OVERTEMPERATURE PROTECTION LOGICAL "0" INPUT VOLTAGE UP TO 1.5 V (HIGH NOISE IMMUNITY)
M u l ti w a tt 1 5 P o w er S O 2 0
D E SC R I PT I O N The L298 is an integrated monolithic circuit in a 15lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Two enable inputs are provided to enable or disable the device independently of the input signals. The emitters of the lower transistors of each bridge are connected together and the corresponding external terminal can be used for the conB L O C K DIAGRAM
O R D ER I N G NUMBERS : L298N (Multiwatt Vert.) L298HN (Multiwatt Horiz.) L298P (PowerSO20)
nection of an external sensing resistor. An additional supply input is provided so that the logic works at a lower voltage.
Jenuary 2000
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L298
ABSOLUTE MAXIMUM RATINGS
Symbol VS VSS VI,Ven IO Power Supply Logic Supply Voltage Input and Enable Voltage Peak Output Current (each Channel) Non Repetitive (t = 100s) Repetitive (80% on 20% off; ton = 10ms) DC Operation Sensing Voltage Total Power Dissipation (Tcase = 75C) Junction Operating Temperature Storage and Junction Temperature P a ra m e t er V al u e 50 7 0.3 to 7 3 2.5 2 1 to 2.3 25 25 to 130 40 to 150 Unit V V V A A A V W C C
Vsens Ptot Top Tstg, Tj
PIN CONNECTIONS (top view)
15 14 13 12 11 10 CURRENT SENSING B OUTPUT 4 OUTPUT 3 INPUT 4 ENABLE B INPUT 3 LOGIC SUPPLY VOLTAGE VSS GND INPUT 2 ENABLE A INPUT 1 SUPPLY VOLTAGE VS OUTPUT 2 OUTPUT 1 CURRENT SENSING A
Multiwatt15
9 8 7 6 5 4 3 2 1
TAB CONNECTED TO PIN 8
D95IN240A
GND Sense A N.C. Out 1 Out 2 VS Input 1 Enable A Input 2 GND
1 2 3 4 5 6 7 8 9 10
D95IN239
20 19 18 17
GND Sense B N.C. Out 4 Out 3 Input 4 Enable B Input 3 VSS GND
PowerSO20
16 15 14 13 12 11
THERMAL DATA
Symbol Rth j-case Rth j-amb Pa r a m et e r Thermal Resistance Junction-case Thermal Resistance Junction-ambient Max. Max. Po w e r S O 20 13 (*) M u l ti w a tt 1 5 3 35 Unit C/W C/W
(*) Mounted on aluminum substrate
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PIN FUNCTIONS (refer to the block diagram)
MW.15 1;15 2;3 4 P o w er S O 2;19 4;5 6 N a me Sense A; Sense B Out 1; Out 2 VS F u n c t io n Between this pin and ground is connected the sense resistor to control the current of the load. Outputs of the Bridge A; the current that flows through the load connected between these two pins is monitored at pin 1. Supply Voltage for the Power Output Stages. A non-inductive 100nF capacitor must be connected between this pin and ground. TTL Compatible Inputs of the Bridge A. TTL Compatible Enable Input: the L state disables the bridge A (enable A) and/or the bridge B (enable B). Ground. Supply Voltage for the Logic Blocks. A100nF capacitor must be connected between this pin and ground. TTL Compatible Inputs of the Bridge B. Outputs of the Bridge B. The current that flows through the load connected between these two pins is monitored at pin 15. Not Connected
5;7 6;11 8 9 10; 12 13; 14
7;9 8;14 1,10,11,20 12 13;15 16;17 3;18
Input 1; Input 2 Enable A; Enable B GND VSS Input 3; Input 4 Out 3; Out 4 N.C.
ELECTRICAL CHARACTERISTICS (VS = 42V; VSS = 5V, Tj = 25C; unless otherwise specified)
Symbol VS VSS IS P a ra m e t er Supply Voltage (pin 4) Logic Supply Voltage (pin 9) Quiescent Supply Current (pin 4) T e s t Conditions Operative Condition Ven = H; IL = 0 Vi = L Vi = H Vi = X Vi = L Vi = H Vi = X 0.3 2.3 Vi = L Vi = H VSS 0.6V 0.3 2.3 Ven = L Ven = H VSS 0.6V IL = 1A IL = 2A IL = 1A IL = 2A IL = 1A IL = 2A 0.95 (5) (5) (5) (5) 0.85 1.80 1 (1) 30 1.35 2 1.2 1.7 30 Min. VIH +2.5 4.5 5 13 50 24 7 Typ. M ax . 46 7 22 70 4 36 12 6 1.5 VSS 10 100 1.5 VSS 10 100 1.7 2.7 1.6 2.3 3.2 4.9 2 Unit V V mA mA mA mA mA mA V V A A V V A A V V V V V V V
ISS
Ven = L Quiescent Current from VSS (pin 9) Ven = H; IL = 0 Ven = L
ViL ViH IiL IiH Ven = L Ven = H Ien = L Ien = H VCEsat (H)
Input Low Voltage (pins 5, 7, 10, 12) Input High Voltage (pins 5, 7, 10, 12) Low Voltage Input Current (pins 5, 7, 10, 12) High Voltage Input Current (pins 5, 7, 10, 12) Enable Low Voltage (pins 6, 11) Enable High Voltage (pins 6, 11) Low Voltage Enable Current (pins 6, 11) High Voltage Enable Current (pins 6, 11) Source Saturation Voltage
VCEsat (L) Sink Saturation Voltage VCEsat Vsens Total Drop Sensing Voltage (pins 1, 15)
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L298
ELECTRICAL CHARACTERISTICS (continued)
Symbol T1 (Vi) T2 (Vi) T3 (Vi) T4 (Vi) T5 (Vi) T6 (Vi) T7 (Vi) T8 (Vi) fc (Vi) T1 (Ven) T2 (Ven) T3 (Ven) T4 (Ven) T5 (Ven) T6 (Ven) T7 (Ven) T8 (Ven) P a ra m e t er Source Current Turn-off Delay Source Current Fall Time Source Current Turn-on Delay Source Current Rise Time Sink Current Turn-off Delay Sink Current Fall Time Sink Current Turn-on Delay Sink Current Rise Time Commutation Frequency Source Current Turn-off Delay Source Current Fall Time Source Current Turn-on Delay Source Current Rise Time Sink Current Turn-off Delay Sink Current Fall Time Sink Current Turn-on Delay Sink Current Rise Time T e s t Conditions 0.5 Vi to 0.9 IL 0.9 IL to 0.1 IL 0.5 Vi to 0.1 IL 0.1 IL to 0.9 IL 0.5 Vi to 0.9 IL 0.9 IL to 0.1 IL 0.5 Vi to 0.9 IL 0.1 IL to 0.9 IL IL = 2A 0.5 Ven to 0.9 IL 0.9 IL to 0.1 IL 0.5 Ven to 0.1 IL 0.1 IL to 0.9 IL 0.5 Ven to 0.9 IL 0.9 IL to 0.1 IL 0.5 Ven to 0.9 IL 0.1 IL to 0.9 IL (2); (4) (2); (4) (2); (4) (2); (4) (3); (4) (3); (4) (3); (4) (3); (4) (2); (4) (2); (4) (2); (4) (2); (4) (3); (4) (3); (4) (3); (4) (3); (4) Min. Typ. 1.5 0.2 2 0.7 0.7 0.25 1.6 0.2 25 3 1 0.3 0.4 2.2 0.35 0.25 0.1 40 M ax . Unit s s s s s s s s KHz s s s s s s s s
1) 1)Sensing voltage can be 1 V for t 50 sec; in steady state Vsens min 0.5 V. 2) See fig. 2. 3) See fig. 4. 4) The load must be a pure resistor.
Figure 1 : Typical Saturation Voltage vs. Output Current.
Figure 2 : Switching Times Test Circuits.
Note : For INPUT Switching, set EN = H For ENABLE Switching, set IN = H
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L29 8
Figure 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 = L
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L298
Figure 5 : Sink Current Delay Times vs. Input 0 V Enable Switching.
Figure 6 : Bidirectional DC Motor Control.
Inputs Ven = H C=H;D=L C=L;D=H C=D C=X;D=X
H = High
F u n c t io n Forward Reverse Fast Motor Stop Free Running Motor Stop
X = Don't care
Ven = L
L = Low
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Figure 7 : For higher currents, outputs can be paralleled. Take care to parallel channel 1 with channel 4 and channel 2 with channel 3.
A P PL I C A T I O N INFORMATION (Refer to the block diagram) Each input must be connected to the source of the 1.1. POWER OUTPUT STAGE driving signals by means of a very short path. The L298 integrates two power output stages (A ; B). Turn-On and Turn-Off : Before to Turn-ON the SupThe power output stage is a bridge configuration ply Voltage and before to Turn it OFF, the Enable inand its outputs can drive an inductive load in comput must be driven to the Low state. mon or differenzial mode, depending on the state of the inputs. The current that flows through the load 3. APPLICATIONS comes out from the bridge at the sense output : an Fig 6 shows a bidirectional DC motor control Scheexternal resistor (RSA ; RSB.) allows to detect the inmatic Diagram for which only one bridge is needed. tensity of this current. The external bridge of diodes D1 to D4 is made by 1.2. INPUT STAGE four fast recovery elements (trr 200 nsec) that Each bridge is driven by means of four gates the inmust be chosen of a VF as low as possible at the put of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB. worst case of the load current. The In inputs set the bridge state when The En input The sense output voltage can be used to control the is high ; a low state of the En input inhibits the bridge. current amplitude by chopping the inputs, or to proAll the inputs are TTL compatible. vide overcurrent protection by switching low the enable input. 2. SUGGESTIONS The brake function (Fast motor stop) requires that A non inductive capacitor, usually of 100 nF, must the Absolute Maximum Rating of 2 Amps must be foreseen between both Vs and Vss, to ground, never be overcome. as near as possible to GND pin. When the large capacitor of the power supply is too far from the IC, a When the repetitive peak current needed from the second smaller one must be foreseen near the load is higher than 2 Amps, a paralleled configuraL298. tion can be chosen (See Fig.7). The sense resistor, not of a wire wound type, must An external bridge of diodes are required when inbe grounded near the negative pole of Vs that must ductive loads are driven and when the inputs of the be near the GND pin of the I.C. IC are chopped ; Shottky diodes would be preferred.
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L298
This solution can drive until 3 Amps In DC operation and until 3.5 Amps of a repetitive peak current. On Fig 8 it is shown the driving of a two phase bipolar stepper motor ; the needed signals to drive the inputs of the L298 are generated, in this example, from the IC L297. Fig 9 shows an example of P.C.B. 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. Fig 10 shows a second two phase bipolar stepper motor control circuit where the current is controlled by the I.C. L6506.
RS1 = RS2 = 0.5 D1 to D8 = 2 A Fast diodes
{
VF 1.2 V @ I = 2 A trr 200 ns
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L29 8
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 current
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L298
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.66 1.02 17.53 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.870 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 0.050 0.700 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.060 0.710 MIN. inch TYP. MAX. 0.197 0.104 0.063
OUTLINE AND MECHANICAL DATA
Multiwatt15 V
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L29 8
DIM. MIN. A B C E F G G1 H1 H2 L L1 L2 L3 L4 L5 L6 L7 S S1 Dia1 2.65 1.9 1.9 3.65 17.25 10.3 20.57 18.03 2.54 17.5 10.7 5.28 2.38 2.9 2.6 2.6 3.85 0.104 0.075 0.075 0.144 17.75 10.9 0.679 0.406 0.49 0.66 1.14 17.57 19.6 20.2 0.810 0.710 0.100 0.689 0.421 0.208 0.094 0.114 0.102 0.102 0.152 0.699 0.429 1.27 17.78 mm TYP. MAX. 5 2.65 1.6 0.55 0.75 1.4 17.91 0.019 0.026 0.045 0.692 0.772 0.795 0.050 0.700 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.022 0.030 0.055 0.705
OUTLINE AND MECHANICAL DATA
Multiwatt15 H
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L298
mm TYP. inch TYP.
DIM. A a1 a2 a3 b c D (1) D1 E e e3 E1 (1) E2 E3 G H h L N S T
MIN. 0.1 0 0.4 0.23 15.8 9.4 13.9
MAX. 3.6 0.3 3.3 0.1 0.53 0.32 16 9.8 14.5
MIN. 0.004 0.000 0.016 0.009 0.622 0.370 0.547
MAX. 0.142 0.012 0.130 0.004 0.021 0.013 0.630 0.386 0.570
OUTLINE AND MECHANICAL DATA
1.27 11.43 10.9 5.8 0 15.5 0.8 11.1 0.429 2.9 6.2 0.228 0.1 0.000 15.9 0.610 1.1 1.1 0.031 10 (max.) 8 (max.) 10
0.050 0.450 0.437 0.114 0.244 0.004 0.626 0.043 0.043
JEDEC MO-166
0.394
(1) "D and F" do not include mold flash or protrusions. - Mold flash or protrusions shall not exceed 0.15 mm (0.006"). - Critical dimensions: "E", "G" and "a3"
PowerSO20
N
N a2 b e A
R
c DETAIL B a1 E DETAIL A
DETAIL A e3 H
lead
D a3 DETAIL B
20 11
Gage Plane 0.35
slug
-C-
S E2 T E1 BOTTOM VIEW
L
SEATING PLANE G C
(COPLANARITY)
E3
1 10
h x 45
PSO20MEC
D1
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L29 8
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