FAN7319 Datasheet, PDF (17/23 Pages) Fairchild Semiconductor – LCD Backlight Inverter Drive IC

striking mode only for 6.9s, as shown in Figure 41. After
ignition, if V ^min is less than 0.5V in normal mode, the
OLR
IC is shut down after a delay of 500ms, as shown in
Figure 42. In DCR mode (VENA>2.5V), if V ^min is less
OLR
than 0.5V in normal mode; the IC operates normally
without shutdown, as shown in Figure 43.
Figure 38. Open-Lamp Regulation in Striking Mode
Figure 41. Open-Lamp Protection in Striking Mode
Figure 39. Open-Lamp Regulation in Normal Mode
CMP
0
OVPR
OLR 0
-OVPR
1V
TIMER
\WœhGjœ™™Œ•›Gz–œ™Š•Ž
zœ›G‹–ž•
0
OUTA
OUTB
0
OUTC
OUTD
0
Figure 40. Over-Voltage Protection in Normal Mode
Open-Lamp Protection
If the minimum of the rectified OLP voltage V ^min is
OLR
less than VOLP during initial operation, the IC operates in
Figure 42. Open-Lamp Protection in Normal Mode
Figure 43. Open-Lamp Protection in DCR Mode
© 2010 Fairchild Semiconductor Corporation
FAN7319 • 1.0.1
17
www.fairchildsemi.com