Star Tech Journal

STAR*TEcH
Journal
May 1996
SEGA PINBALL WHITE STAR SYSTEM
1/0 POWER DRIVER BOARD
THEORY OF OPERATION (PART
3)
Team Sega
Joe Blackwell, Eric Winston, Ted Kilpin,Jay Alfer
Sega Pinball, Melrose Park, Illinois
SD's & FL's
Solenoid Drivers & Flash Lamps
J8 & J9 are high side outputs for
driving 50v solenoids and other
heavy loads. Each connector has
its own 8-bit Data Latch
(74HCT273) with a high current
driver on each output bit.
HERES A TIP,
safely be tested by clipping one
end of a clip-lead to test point
FET TPLl and then the other to
the corresponding gate resistor
Rl-R16 (see note 2). This will
apply 3.4V to the gate of the
MOSFET transistor thus switch-
ing it on.
I MEAN A
• FETTIP!·
NO
TM
]7 &]6 each are a bank
of 8 low side drivers for
driving lamps or other
20v lower current sole-
Each latch has a unique address
for solenoid and flash lamp con-
trol. Data is latched through to
the output when the "CP" line is
active high triggering on the lead-
ing edge of the pulse.
NoTE 1
We have used abbreviations
which correspond directly to the
circuit device that is being driven
(e.g. FLMP for flashlamps).
The high current drivers are
MOSFET
devices
type
STP20N10L which can easily &
They use a bipolar power
transistor TIP122 which can also
be tested by using test point TIP
TPL3 and the corresponding re-
sistors R17-R32 (see note 2).
2
Clip on the resistor side with the
white stripe (shaded area on the
schematic diagram). Rl controls
Ql and R2 controls Q2 etc ...
NOTE
rrec
as follows when ordering,
STP20N lOL, the manufac-
ture SGS Thomson will only
recognize this number.
When
ordering
the
STP20N 10L (P20N10L)
MOS FET Driver from Sega
Pinball Distributor the Partf
is 110-0106-00;
SGS.TH@MSON
STP20N70L
SEGA PART # 110-0106-00
.
NEXT MONTH: We
will take a look at the
lamp matrix.
SGS THOMSON
8TP19N06L
SEGAPART # 110-0088-00
I~you~ave any qu~§tionsfe.~l
freeto callus: 800/542~5377.