STV9302 datasheet(9/15 Pages) STMICROELECTRONICS

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STV9302A

Application Hints

4.3.1

Centring

When idle, both driver outputs provide icm and the yoke current should be null (R1 is negligible),

hence:

4.3.2

Peak Current

Scanning current should be IP when positive and negative driver outputs provide respectively

icm -ip and icm +ip, therefore

and since R7 = R2:

Choose R1 in the 1Ω range, the value of R2 = R7 follows. Remember that i is one-quarter of driver

peak-peak differential signal! Also check that the voltages on the driver outputs remain inside

allowed range.

Example: for icm = 0.4mA, i = 0.2mA (corresponding to 0.8mA of peak-peak differential

current), Ip =1A

Choose R1 = 0.75Ω, it follows R2 = R7 = 1.875kΩ.

4.3.3

Ripple Rejection

Make sure to connect R7 directly to the ground side of R1.

4.3.4

Secondary Breakdown Diagrams

The diagram has been arbitrarily limited to max VS (35 V) and max I0 (2 A).

Figure 8: Output Transistor Safe Operating Area (SOA) for Secondary Breakdown

⋅

therefore R

⋅

–

() R

⋅

() R

⋅

-----

-----------

–

100

µs

10ms

100ms

0.01

0.1

100

Volts

@ Tcase=25°C

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