Rainbow-electronics MAX4880 Manual de usuario Pagina 6

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MAX4880
Overvoltage-Protection Controller with
Internal Disconnect Switch
6 _______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
10
FLAGV
Active-Low, Open-Drain-Fault Flag Output. FLAGV goes low when either an overvoltage or undervoltage
fault occurs at IN. FLAGV is disabled when EN goes high. During startup, FLAGV has a delay of 50ms
after V
GATE
> 0.3V, before being initially driven high.
—EP
Exposed Pad. EP is internally connected to GND. Do not use EP as the only electrical ground connection.
V
IN
V
GATE
1.2V
V
UVLO
0.3V
t
START
2.4V
t
DELAY
8V
t
GON
5V
V
FLAGV
Figure 1. Startup Timing Diagram
V
IN
V
GATE
V
OVLO
0.3V
t
GOFF
0.4V
t
FLAG
5V
8V
V
FLAGV
Figure 2. Overvoltage Fault Timing Diagram
V
IN
I
GATE
V
OVLO
80%
t
OVP
0V
Figure 3. Power-Up Overvoltage Timing Diagram
V
GATE
0.3V
t
DIS
2.4V
V
EN
Figure 4. Disable Timing Diagram
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