L8202

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DC MOTOR DRIVERS OPERATIONS

L8202 provides PWM bi-directional drive for two DC motors.

The PWM modulation is provided by the MDx_PWM input, and the current direction into the motor by the

MDCx_D bit in the serial input port.

The driver is protected versus overloads on the output lines to a max. current of 2 Amps peak.

The current protection circuit is implemented only on the High Side Drivers, so current protection is pro-

vided to motor currents only, but not to shorts between Motor Outputs to GND or Vs.

A blanking period following a current turn-on event is included to prevent false current protection.

The H Bridges are protected versus cross-conduction.

Thermal protection with hysteresys is provided to the Motor Drivers.

During thermal protection event the Bridge Outputs are forced into a high impedance status.

If nReset is low the motor drive outputs are forced in high impedance

Table 11. Truth Table

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Pulsed Output Current

DC Motor Overcurrent

Threshold

2

1.5

A

A

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

ON Resistance

0.31

0.32

W

PWM frequency

10

30

KHz

Minimum Ton and Toff time

500

ns

PWM Duty Cycle range

1

99

%

Internal

Thermal Bit

Inputs

Outputs

MDCx_D

DCx_PWM

DCxA

DCxB

LL

L

H

H

LH

L

H

HL

H

H

HH

H

L

H

X

X

All transistors turned off All transistors turned off