Specifications

2–26
Principles of Operation
Coil Temp.
Open Detect
12.5 V
V
Test Mode
HD Coil Temp.
Window Compare
Fault Detect
&
&
HD Short
12.5  1%
12.5
Flyback
Diodes
ramp
+24
bootstrap
Shift
Hammer
Coil
COM
CLK
FIRE
NLD_RST
Level
Shift
Boot
Strap
V
SUS
+48 V
V
LD
FET
Register
Latch
Figure 2–15. Hammer Driver Logic
Power Filtering
The power supply is housed in a protected and independently cooled steel
module separate from the card cage containing the hammer driver and
mechanism driver boards. The hammer driver board therefore provides bulk
filtering of the +48 and +12.5 (V
SUS
) supplies. (See Figure 2–16.)
Filter
+48V
Capacitors
+12.5V
GND
+48V
+12.5V
GND
From
Power
Supply
To
Mechanism
Driver
Figure 2–16. Hammer Driver Power Filtering