Datasheet

V
IN+
V
IN-
V
CC1
GND1
NC
GND1
RESET
FAULT
0.1
µF
5 V
µC
ISO5500
3.3
kW
330 pF
1
2
3
4
5
6
7
8
100 Ω
V
IN+
V
IN-
V
CC1
GND1
NC
GND1
DESAT
V
E
V
EE -L
V
CC2
V
C
V
OUT
V
EE -L
V
EE-P
RESET
FAULT
15V
0.1
μF
0.1
μF
3.3V
μC
ISO5500
3.3
kΩ
330 pF
0.1
μF
100
pF
D
DESAT
V
F
+
-
R
g
Q1
Q2
V
CE
+
-
V
CE
+
-
3-PHASE
OUTPUT
1
2
3
4
5
6
7
8
16
15
14
12
13
11
10
9
0.1
μF
15V
4.7
μF
D
S
(opt.)
ISO5500
www.ti.com SLLSE64C –SEPTEMBER 2011–REVISED JUNE 2013
Figure 62. Recommended Application Circuit
FAULT PIN CIRCUITRY
The FAULT pin is an open-drain output requiring a 3.3 kΩ pull-up resistor to provide logic high when FAULT is
inactive.
Because fast common mode transients can alter the FAULT-pin voltage during high state, a 330 pF capacitor
connected between FAULT and GND1 is recommended to provide sufficient noise margin at the specified CMTI
of 50 kV/μs. The added capacitance does not increase the FAULT response time during a fault condition.
Figure 63. FAULT Pin Circuitry for High CMTI
DRIVING THE CONTROL INPUTS
The amount of common-mode transient immunity (CMTI) is primarily determined by the capacitive coupling from
the high-voltage output circuit to the low-voltage input side of the ISO5500. For maximum CMTI performance, the
digital control inputs, V
IN+
and V
IN–
, must be actively driven by standard CMOS or TTL, push-pull drive circuits.
This type of low-impedance signal source provides active drive signals that prevent unwanted switching of the
ISO5500 output under extreme common-mode transient conditions. Passive drive circuits, such as open-drain
configurations using pull-up resistors, must be avoided.
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 27
Product Folder Links :ISO5500