SI8220 SILABS [Silicon Laboratories], SI8220 Datasheet - Page 12

• Manufacturer Part Number: SI8220
• Description: 0.5 AND 2.5 AMP ISODRIVERS WITH OPTO INPUT (2.5, 3.75, AND 5.0 KVRMS)
• Manufacturer: SILABS [Silicon Laboratories]

Si8220/21
5. Technical Description
5.1. Device Behavior
Truth tables for the Si8220/21 are summarized in Table 9.
5.2. Device Startup
Output V
t
normal operation, and shutdown behavior is shown in Figure 7.
12
START
V
I
F(ON)
UVLO+
I
UVLO-
DD
F
V
. Following this, the output is high when the current flowing from anode to cathode is > I
O
Note: “X” = don’t care.
O
Cathode
V
GND1
GND1
is held low during power-up until V
DDHYS
GND
t
Hi-Z
START
VF
X
X
Figure 7. Si8220/21 Operating Behavior (I
Anode
GND
Hi-Z
VF
VF
VF
X
X
t
PHL
Table 9. Si8220/21 Truth Table Summary
Diode Current (I
t
PLH
> I
< I
F(OFF)
F(OFF
X
0
0
0
0
DD
rises above the UVLO+ threshold for a minimum time period of
F
Rev. 0.22
)
t
START
< UVLO
> UVLO
> UVLO
> UVLO
> UVLO
> UVLO
> UVLO
V
DD
F
> I
F(MIN)
VO
H
L
L
L
L
L
L
when V
F
Device turned off
Logic high state
Logic low state
Logic low state
Logic low state
Logic low state
Logic low state
> V
Comments
F(MIN)
F(ON)
)
. Device startup,