TSC2012H datasheet(40/49 Pages) STMICROELECTRONICS

40 / 49 page

Figure 80. TSC2011H H-bridge application

-50µ

-40µ

-30µ

-20µ

-10µ

10µ

20µ

30µ

40µ

50µ

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

-0.48

-0.24

0.00

0.24

0.48

0.72

0.96

1.20

Time (s)

Vicm variation from 0V to 12V

Vout

Current flowing into the motor

After a fast variation of the input common mode, the TSC2011H needs less than 5 µs to recover its normal

behavior.

5.13.2

Solenoid valve

In automotive applications, the automatic transmission relies on bands and clutches to change gears, and the

only way they can be applied is by fluid pressure. The transmission solenoid is responsible for opening or closing

valves in the valve body to allow transmission fluid to enter, at which point the fluid can pressurize the clutches

and bands. Solenoids consist of a spring loaded plunger wrapped with a coil of wire, and it is generally driven

thanks to a MOS transistor.

In the schematic below the TSC2011H is used in mono-directional mode. When the MOS is ON, the current can

flow through the solenoid and actuate this one. The input common mode is high in this case.

When the MOS is turned OFF, as the current stored in the solenoid cannot stop instantaneously, the diode turns

ON allowing a freewheeling to discharge the solenoid resulting in a common mode one diode voltage drop below

ground.

Thanks to its large input common mode range, the TSC2011H can be used for such applications depicted in the

figure below.

In order not to saturate the output when no current is flowing into Rsense, a small voltage on Vref has to be applied.

TSC2010H, TSC2011H, TSC2012H

Application information

DS13791 - Rev 2

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