STV7622 datasheet(13/32 Pages) STMICROELECTRONICS

Part #	STV7622

Description	192 output plasma display panel data driver

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 32 page

STV7622

Circuit description

13/32

Spread Spectrum: To avoid having too large of a current in the driver during the rising edge

of the power outputs, all outputs are not triggered at the same time.

Instead, the STV7622 inserts a small delay between the rising edge of two consecutive

outputs. This delay depends on picture or image content (see Figure 8). For a dark picture,

we have tSSJ-MIN = 1 to 2ns (typ.) between output 1 and any output X, while for a white

picture, we have tSSJ-MAX = 100ns (typ.).

The SSJ function spreads the discharge current in the scan lines and, therefore, reduces

EMI by “spreading” the energy spectrum.

Figure 8.

Spread spectrum filter

OUT-1

OUT-x

SSJ-MIN

SSJ-MAX

OUT-1

OUT-x

Case #1: Dark picture

Case #2: White picture

STV7622 Datasheet(PDF) 13 Page - STMicroelectronics