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TD340

H-BRIDGE QUAD POWER MOSFET DRIVER FOR DC MOTOR CONTROL

STMicroelectronics 

Figure 3 : Synchronous Rectification Principle

ex1:

Speed: PWM=x%

No synchronous rectification

TD340

ex2:

Speed: PWM=x%

With synchronous rectification - TD340

FULL

OFF

1-x%

M

FULL

ON

PWM

x%

FULL

OFF

HIGH DISSIPATION

THROUGH FREE WHEEL DIODE!

PWM

PWM

1-x%

M

x%

LOW DISSIPATION

THROUGH LOW Rdson!

FULL

ON

FULL

OFF

Table 1 : Function Table in Digital and Analog Modes

IN1 (V)

Mosfets Status

Stby Disable

IN2

State State

(V)

digital analog

Q1L Q1H Q2L Q2H

Comments

1

X

X

X

X OFF OFF OFF OFF Motor Off in Standby Mode

X

1

X

X

X OFF OFF OFF OFF Motor Off in Disable Mode

0

0

0 idle 0 to 1.2 0 ON OFF ON OFF Motor Brake Low

0

0

0 idle 0 to 1.2 5 OFF ON OFF ON Motor Brake High

0

0

PWM 1.2 to 3.6 0 OFF ON PWM !PWM Motor x% Forward

0

0

PWM 1.2 to 3.6 5 PWM !PWM OFF ON Motor x% Backward

0

0

5 idle 3.6 to 5 0 OFF ON ON OFF Motor 100% Forward

0

0

5 idle 3.6 to 5 5 ON OFF OFF ON Motor 100% Backward

Notes:

- Standby state is active when STBY pin is pulled low

- Disable state is active when one of the following conditions is met: UVLO, OVLO, Reset, Watchdog Timeout.

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