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L6203 Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L6203
Beschreibung DMOS FULL BRIDGE DRIVER
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 20 Seiten
L6203 Datasheet, Funktion
L6201
L6202 - L6203
DMOS FULL BRIDGE DRIVER
SUPPLY VOLTAGE UP TO 48V
5A MAX PEAK CURRENT (2A max. for L6201)
TOTAL RMS CURRENT UP TO
L6201: 1A; L6202: 1.5A; L6203/L6201PS:4A
RDS (ON) 0.3 (typical value at 25 °C)
CROSS CONDUCTION PROTECTION
TTL COMPATIBLE DRIVE
OPERATING FREQUENCY UP TO 100 KHz
THERMAL SHUTDOWN
INTERNAL LOGIC SUPPLY
HIGH EFFICIENCY
DESCRIPTION
The I.C. is a full bridge driver for motor control ap-
plications realized in Multipower-BCD technology
which combines isolated DMOS power transistors
with CMOS and Bipolar circuits on the same chip.
By using mixed technology it has been possible to
optimize the logic circuitry and the power stage to
achieve the best possible performance. The
DMOS output transistors can operate at supply
voltages up to 42V and efficiently at high switch-
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Powerdip 12+3+3
SO20 (12+4+4)
Multiwatt11
PowerSO20
ORDERING NUMBERS:
L6201 (SO20)
L6201PS (PowerSO20)
L6202 (Powerdip18)
L6203 (Multiwatt)
ing speeds. All the logic inputs are TTL, CMOS
and µC compatible. Each channel (half-bridge) of
the device is controlled by a separate logic input,
while a common enable controls both channels.
The I.C. is mounted in three different packages.
July 1997
1/20
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.






L6203 Datasheet, Funktion
L6201 - L6202 - L6203
Figure 5: Normalized RDS (ON)at 25°C vs. Temperature Typical Values
Figure 6a: Typical Diode Behaviour in Synchro-
nous Rectification (L6201)
Figure 6b: Typical Diode Behaviour in Synchro-
nous Rectification (L6201PS/02/03)
Figure 7a: Typical Power Dissipation vs IL
(L6201)
Figure 7b: Typical Power Dissipation vs IL
(L6201PS, L6202, L6203))
6/20

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L6203 pdf, datenblatt
L6201 - L6202 - L6203
Quiescent Energy
The last contribution to the energy dissipation is
due to the quiescent supply current and is given by:
EQUIESCENT = IQUIESCENT Vs T
Total Energy Per Cycle
ETOT = EOFF/ON + ELD + ECOM +
+ EON/OFF + EQUIESCENT
The Total Power Dissipation PDIS is simply :
PDIS = ETOT/T
Tr = Rise time
TLD = Load drive time
Tf = Fall time
Td = Dead time
T = Period
T = Tr + TLD + Tf + Td
DC Motor Speed Control
Since the I.C. integrates a full H-Bridge in a single
package it is idealy suited for controlling DC mo-
tors. When used for DC motor control it performs
the power stage required for both speed and di-
rection control. The device can be combined with
a current regulator like the L6506 to implement a
transconductance amplifier for speed control, as
shown in figure 17. In this particular configuration
only half of the L6506 is used and the other half
of the device may be used to control a second
Figure 17: Bidirectional DC Motor Control
motor.
The L6506 senses the voltage across the sense
resistor RS to monitor the motor current: it com-
pares the sensed voltage both to control the
speed and during the brake of the motor.
Between the sense resistor and each sense input
of the L6506 a resistor is recommended; if the
connections between the outputs of the L6506
and the inputs of the L6203 need a long path, a
resistor must be added between each input of the
L6203 and ground.
A snubber network made by the series of R and C
must be foreseen very near to the output pins of
the I.C.; one diode (BYW98) is connected be-
tween each power output pin and ground as well.
The following formulas can be used to calculate
the snubber values:
R VS/lp
C = lp/(dV/dt) where:
VS is the maximum Supply Voltage foreseen on
the application;
Ip is the peak of the load current;
dv/dt is the limited rise time of the output voltage
(200V/µs is generally used).
If the Power Supply Cannot Sink Current, a suit-
able large capacitor must be used and connected
near the supply pin of the L6203. Sometimes a
capacitor at pin 17 of the L6506 let the application
better work. For motor current up to 2A max., the
L6202 can be used in a similar circuit configura-
tion for which a typical Supply Voltage of 24V is
recommended.
12/20

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