Page 173 - The Art and Science of Analog Circuit Design
P. 173
Jim Williams
VIN
H
Figure 11-12.
severely degraded by a lossy display enclosure or excessive high voltage Switched mode
current sink re-
wire lengths. Display enclosures with too much conducting material near
the lamp have huge losses due to capacitive coupling. A poorly designed stores efficiency.
display enclosure can easily degrade efficiency by 20%. High voltage
wire runs typically cause 1% loss per inch of wire.
RATED MAXIMUM
OPERATING POINT
Figure 11-13.
Emissivity for a
typical 6mA lamp;
curve flattens badly
above 6mA,
2 3 4 5 6 7
TUBE CURRENT(mA)
155
