FAN7318A Datasheet, PDF (21/24 Pages) Fairchild Semiconductor – LCD Backlight Inverter Drive IC

Applying voltage higher than 2.5V to the ENA pin
disables SLP. Applying voltage lower than 2.1V to the
ENA pin enables SLP.
Figure 61. Short-Lamp Protection Disable in
DCR Mode
CMP-High Protection
If CMP is more than 3.5V for a time predetermined by
the TIMER pin capacitor and a internal current source of
50µA in normal mode; the IC is shut down, as shown in
Figure 62.
Figure 63. CMP-High Protection Disable by a
Pull- Down Resistor
Thermal Shutdown
The IC provides the function to detect the abnormal
over-temperature. If the IC temperature exceeds
approximately 150°C, the thermal shutdown triggers.
Figure 62. CMP-High Protection
This protection is disabled by a pull-down resistor (a few
MΩ) between CMP and GND. If CMP voltage reaches
2.5V, CMP source current decreases to 2µA. Determine
a pull-down resistor value such that the whole of this
current can flow through the resistor. If so, CMP-high
protection can be disabled, as shown Figure 63. This
protection is disabled in striking mode to ignite the
lamps reliably.
© 2009 Fairchild Semiconductor Corporation
FAN7318A • 1.0.0
21
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