STV7801S datasheet(5/18 Pages) STMICROELECTRONICS

5 / 18 page

STV7801S

5/18

4 - CIRCUIT DESCRIPTION

STV7801 is a monolithic integrated circuit imple-

mented in ST Microelectronics BCD proprietary

technology designed as a switched power supply

generator for data drivers in a Plasma Display

Panel (P.D.P.) application.

The high load drive capability of STV7801 reduces

the number of devices necessary to drive a com-

plete PDP (4 to 6 devices for a 42" VGA 16/9 PDP

monitor).

STV7801 high current drive capability provides a

high power recovery efficiency coefficient superior

to 85% on constant capacitive load. The structure

of the output stage is implemented with 2 DMOS

transistors to minimise the die size. External com-

ponents like bootstrap capacitor can also be im-

plemented to increase the performances of the cir-

cuit.

STV7801 integrates level shifters driven with 5V

CMOS compatible levels. This feature reduces the

number of discrete components such as voltage

translators.

STV7801 integrates several protections like output

over-voltage, timing control and over-temperature

to increase the reliability of the system.

Over-voltage protection consists in clamping di-

odes connected between Vpp, Vssp and critical

nodes of the devices.

Timing control consists in a monitoring of the out-

put stage control signals to avoid any cross-con-

duction.

Over-temperature protection is activated when

junction temperature reaches the threshold values

fixed internally and sets the device in tri-state

mode.

STV7801 can drive several data drivers connected

to column electrodes of the panel. The maximum

amount of data drivers is given by the Power Re-

covery Current of the device and then the maxi-

mum rise/fall time of the signal. The rise and fall

time of the AC supply signal is adjusted by the val-

ue of the inductance connected to the panel ca-

pacitance through the data drivers. The amount of

STV7801 needed to generate the AC supply can

be reduced by increasing the rise/fall time of the

generated AC supply.

5 - CONTROL SIGNALS TRUTH TABLE

Vpp

Supply

High Voltage Supply

Vpp

Supply

High Voltage Supply

Vssub

Ground

Substrate Ground

Pin Number

Pin Name

Function

Description

HL-Tr

LH-Tr

L-Clmp

H-Clmp

Device Output

Comments

Low to High Transition

Power Saving Mode

High to Low Transition

Power Saving Mode

Vpp

Power Supply Clamp

XLH

Vssp

Power Ground Clamp

Tri-State

Protection Mode

XHHX

Tri-State

Protection Mode

Tri-State

Protection Mode

Tri-State

Protection Mode

STV7801S датащи(PDF) 5 Page - STMicroelectronics

STV7801S датащи(HTML) 5 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

датащи скачать

ссылки URL