ST L293B, L293E User Manual

PUSH-PULL FOUR CHANNEL DRIVERS

■ OUTPUT CURRENT 1A PER CHANNEL

■ PEAK OUTPUT CURRENT 2A PER CHANNEL

(non repetitive)

■ INHIBIT FACILITY

■ HIGH NOISE IMMUNITY

■ SEPARATE LOGIC SUPPLY

■ OVERTEMPE R ATURE PR O TECTION

L293B

L293E

DIP16 POWERDIP(16 +2+2)

DESCRIPTION

The L293B and L293E are quad push-pull drivers
capable of delivering output currents to 1A per
channel. Each channel is controlled by a TTL­compatible logic input and each pair of drivers (a
full bridge) is equipped with an inhibit input which
turns off all four transistors. A separate supply in­put is provided for the logic so that it may be run
off a lower voltage to reduce dissipation.

Additionally, the L293E has external connection of
PIN CONNECTION (Top view)

DIP16 - L293B

ORDERING NUMBERS:

L293B L293E

sensing resistors, for switchmode control.
The L293B and L293E are pac kage in 16 and 20-

pin plastic DIPs respectively ; both use the four
center pins to conduct heat to the printed circuit
board.

POWERDIP (1 6+2 +2) - L293E

July 2003

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L293E L293B

BLOCK DIAGRAMS

DIP16 - L293B

POWERDIP (1 6+2 +2) - L293E

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SCHEMATIC DIAGRAM

L293E L293B

(*) In the L293 these point s are not externally avai l able. They are i nternall y connected to the ground (substrat e).
O Pins of L293 () Pins of L293E.

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

ss

V

V

inh

I

out

P

tot

T

stg

Supply Voltage 36 V

s

Logic Supply Voltage 36 V
Input Voltage 7 V

i

Inhibit Voltage 7 V
Peak Output Current (non repetitive t = 5ms) 2 A
Total Power Dissipation at T

ground-pins

= 80°C 5 W

, TjStorage and Junction Temperature –40 to +150

o

C

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L293E L293B

THERMA L D ATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

Thermal Resistance Junction-case Max. 14
Thermal Resistance Junction-ambient Max. 80

ELECTRICAL CHARACTERISTCS

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

Supply Voltage

s

V

Logic Supply Voltage 4.5 36 V

ss
I

Total Quiescent Supply Current Vi = L; Io = 0; V

s

Total Quiescent Logic Supply

I

ss

Current

V

ViH

V
V

I

inhL

I

inhH

V

CEsatH

V

CEsatL

V

SENS

t
t

* See figure 1
** Referred to L293E

Input Low Voltage -0.3 1.5 V

iL

Input High Voltage VSS ≤ 7V 2.3

Low Voltage Input Current

I

iL

High Voltage Input Current 2.3V ≤ VIH ≤ VSS - 0.6V 30 100 µA

I

iH

Inhibit Low Voltage -0.3 1.5 V

inhL

Inhibit High Voltage VSS ≤7V 2.3

inhH

Low Voltage Inhibit Current V
High Voltage Inhibit Current 2.3V ≤V
Source Output Saturation Voltage Io = -1A 1.4 1.8 V
Sink Output Saturation Voltage Io = 1A 1.2 1.8 V

Sensing Voltage (pins 4, 7, 14, 17)

t

Rise Time 0.1 to 0.9 Vo (*) 250 ns

r

t

Fall Time 0.9 to 0.1 Vo (*) 250 ns

f

Turn-on Delay 0.5 Vi to 0.5 Vo (*) 750 ns

on

Turn-off Delay 0.5 Vi to 0.5 Vo (*) 200 ns

off

= h; Io = 0; V

V

i

Vi = L; Io = 0; V

= h; Io = 0; V

V

i

V

> 7V

SS

V

= 1.5V

il

V

> 7V

SS
inhL

(**)

= H 2 6 mA

inh

= H 16 24 mA

inh

V

= L 4 mA

inh

= H 44 60 mA

inh

= H 16 22 mA

inh

V

= L 16 24 mA

inh

= 1.5V -30 -100 µA

≤ Vss- 0.6V ±10 µA

inhH

V

ss

2.3 7 V

2.3 7 V

o
o

36 V

Vss V

-10 µA

V

ss

2V

C/W
C/W

V

TRUTH TABLE

V

(each channel) V

i

HHH

LLH

H

L

(*) High output impedan ce
(**) Relative to the considerate c hannel

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X
X

o

(*)
(*)

(**)

V

inh

L
L

Figure 1. Swi tc hing Timers

L293E L293B

Figure 2. Saturation voltage versus Output

Current

Figure 3. Source Saturation Voltage versus

Ambient Temperature

Figure 4. Sink Saturation Voltage versus

Ambient Temperatu re

Figure 5. Quiescent Logic Supply Current

versus Logic Supply Voltage

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L293E L293B

Figure 6. Output Voltage versus Inpu t Voltage

Figure 7. Output Voltage versus Inhibit Voltage

APPLICATION INFORMATION

Figure 8. DC Mo t or Controls

(with connection to ground and to the
supply voltage)

V

AM1B M2

inh

HH
H L Run L Fast Motor Stop

L X Free Running X Free Running

Fast M otor Stop

HRun

Motor Stop Motor Stop

L = Low H = High X = Don’t Care

Figure 9. Bidirectional DC Motor Control

Inputs Function

= H C = H ; D = L Turn Right

V

inh

C = L ; D = H Turn Left

C = D Fast Motor Stop

V

= L C = X ; D = X Free Running Motor Stop

inh

L = Low H = High X = Don’t Care

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Figure 10. Bi pol ar S te pp in g Motor Cont rol

L293E L293B

7/12

L293E L293B

Figure 11. Stepping Motor Driver with Phase Curren t Control and Short Circui t Protection

8/12

L293E L293B

MOUNTING INSTRUCTIONS

The R
area of the printed circuit board as shown in figure 12 or to an external heatsink (figure 13).

During soldering the pins temperature must not exceed 260°C and the soldering time must not be longer
than 12 seconds.

The external heatsink or printed circuit copper area must be connected to electrical ground.

Figure 12. Example of P.C. Board Copper Area which is Used as Heatsink

of the L293B and the L293E can be reduced by soldering the GND pins to a suitable copper

th j-amb

Figure 13. External Heatsink Mounting Examp le (R

= 30°C/W)

th

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L293E L293B

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065

b 0.5 0.020

b1 0.25 0.010

D 20 0.787

E 8.5 0.335

e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 0.050

mm inch

OUTLINE AND

MECHANICAL DATA

DIP16

10/12

L293E L293B

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.85 1.40 0.033 0.055

b 0.50 0.020

b1 0.38 0.50 0.015 0.020

D 24.80 0.976

E 8.80 0.346

e 2.54 0.100

e3 22.86 0.900

F 7.10 0.280

I 5.10 0.201

L 3.30 0.130

Z 1.27 0.050

mm inch

OUTLINE AND

MECHANICAL DATA

Powerdip 20

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L293E L293B

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of use 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 implic ation or otherwise under any patent or patent r i ght s of STMi croelectr oni cs. Specifications mentioned in th i s publicati on are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as cri tical components in life support devices or syst ems witho ut express wri t ten approval of STMicroelectronics.

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