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STV7801S bảng dữ liệu(PDF) 5 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  PLASMA DATA POWER SWITCH
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STV7801S
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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
18
Vpp
Supply
High Voltage Supply
19
Vpp
Supply
High Voltage Supply
20
Vssub
Ground
Substrate Ground
Pin Number
Pin Name
Function
Description
HL-Tr
LH-Tr
L-Clmp
H-Clmp
Device Output
Comments
L
H
L
L
Low to High Transition
Power Saving Mode
H
L
L
L
High to Low Transition
Power Saving Mode
LX
L
H
Vpp
Power Supply Clamp
XLH
L
Vssp
Power Ground Clamp
X
X
H
H
Tri-State
Protection Mode
XHHX
Tri-State
Protection Mode
H
X
X
H
Tri-State
Protection Mode
L
L
L
L
Tri-State
Protection Mode


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