USB-Isolator U
ser’s Manual
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3
This circuit isolates USB power and data via two transformers. Input power
is current limited to 200mA to help prevent damage to connected devices
(corresponding to ~137mA out load). Both signal lines are equipped with
common-mode filters and include transient protection. USB is set to full
speed (12 Mbps), but can be jumped to low speed (1.5 Mbps) for legacy
device support.
SHIELD
DATA-
+5V
DATA-
DATA+
GND
CURRENT
LIMITER
DATA+
GND
+5V
COMMON
MODE
FILTER
1500 VAC ISOLATION
SHIELD
PUSH
BUTTON
COMMON
MODE
FILTER
POWER
LED
P
U
S
H
-P
U
L
L
D
R
IV
E
R
FROM PC
ISOLATED POWER
AND SIGNAL
USB
B-TYPE
USB
A-TYPE
TO TARGET
DEVICE
NOTE: FILTERING IS
SIMPLIFIED FOR THIS
DRAWING.
USB-ISOLATOR SIMPLIFIED SCHEMATIC
HOW IT WORKS
DIMENSIONS
