NCP1608BOOSTGEVB
http://onsemi.com
17
Floating Pin Protection (FPP) Jumper
The evaluation board includes a jumper (J1) between the
FB pin and the feedback network to demonstrate the FPP
feature of the NCP1608. If J1 is removed before applying the
line input voltage, the drive is never enabled as shown in
Figure 31. If J1 is removed during operation, the drive is
disabled as shown in Figure 32. J1 is for FPP evaluation
purposes only and should not be included in manufactured
systems.
Figure 31. Startup with Jumper Removed (V
in
= 265 Vac 50 Hz, I
out
= 0 mA)
V
in
(100V/div)
V
CC
(5V/div)
V
DRV
(5V/div)
V
out
(100V/div)
No DRV Pulses
Figure 32. Removing the Jumper During Operation (V
in
= 265 Vac 50 Hz, I
out
= 250 mA)
DRV Pulses Stop
V
in
(100V/div)
V
out
(100V/div)
t(4ms/div)
V
CC
(5V/div)
V
DRV
(5V/div)
t(8μs/div)
(Zoomed In)
