ACPL-332J-000E Avago Technologies US Inc., ACPL-332J-000E Datasheet - Page 22

• Manufacturer Part Number: ACPL-332J-000E
• Description: Amplifier-Output Optocoupler,2-CHANNEL,3.75kV ISOLATION,SO
• Manufacturer: Avago Technologies US Inc.

Specifications of ACPL-332J-000E

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Under Voltage Lockout
The ACPL-332J Under Voltage Lockout (UVLO) feature is
designed to prevent the application of insufficient gate
voltage to the IGBT by forcing the ACPL-332J output
low during power-up. IGBTs typically require gate
voltages of 15 V to achieve their rated V
At gate voltages below 13 V typically, the V
increases dramatically, especially at higher currents. At
very low gate voltages (below 10 V), the IGBT may operate
in the linear region and quickly overheat. The UVLO
function causes the output to be clamped whenever in-
sufficient operating supply (V
exceeds V
UVLO clamp is released to allow the device output to turn
on in response to input signals. As V
0 V (at some level below V
tion circuitry becomes active. As V
(above V
time the UVLO clamp is released, the DESAT protection
is already active. Therefore, the UVLO and DESAT Fault
detection feature work together to provide seamless pro-
tection regardless of supply voltage (V
Active Miller Clamp
A Miller clamp allows the control of the Miller current
during a high dV/dt situation and can eliminate the use
of a negative supply voltage in most of the applications.
During turn-off, the gate voltage is monitored and the
clamp output is activated when gate voltage goes below
2V (relative to V
for a Miller current up to 1100mA. The clamp is disabled
when the LED input is triggered again.
Other Recommended Components
The application circuit in Figure 36 includes an output
pull-down resistor, a DESAT pin protection resistor, a
FAULT pin capacitor, and a FAULT pin pullup resistor and
Active Miller Clamp connection.
Output Pull-Down Resistor
During the output high transition, the output voltage
rapidly rises to within 3 diode drops of V
current then drops to zero due to a capacitive load, the
output voltage will slowly rise from roughly V
to V
the output voltage to V
R
to sink a static current of several 650 µA while the output
is high. Pull-down resistor values are dependent on the
amount of positive supply and can be adjusted according
to the formula, R
22
PULL-DOWN
CC2
within a period of several microseconds. To limit
UVLO+
UVLO+
between the output and V
), the UVLO clamp is released. Before the
(the positive-going UVLO threshold), the
pull-down
EE
). The clamp voltage is V
CC2
= [V
UVLO+
-3(V
CC2
CC2
BE
), first the DESAT protec-
-3 * (V
) is applied. Once V
), a pull-down resistor,
CC2
CC2
is further increased
EE
CC2
BE
is increased from
is recommended
CC2
)] / 650 µA.
).
CE(ON)
CE(ON)
. If the output
OL
+2.5V typ
CC2
voltage.
voltage
-3(V
CC2
BE
)
Figure 38. Output pull-down resistor.
DESAT Pin Protection Resistor
The freewheeling of flyback diodes connected across
the IGBTs can have large instantaneous forward voltage
transients which greatly exceed the nominal forward
voltage of the diode. This may result in a large negative
voltage spike on the DESAT pin which will draw substan-
tial current out of the driver if protection is not used. To
limit this current to levels that will not damage the driver
IC, a 100 ohm resistor should be inserted in series with
the DESAT diode. The added resistance will not alter the
DESAT threshold or the DESAT blanking time.
Figure 39. DESAT pin protection.
Capacitor on FAULT Pin for High CMR
Rapid common mode transients can affect the fault pin
voltage while the fault output is in the high state. A 330
pF capacitor should be connected between the fault pin
and ground to achieve adequate CMOS noise margins at
the specified CMR value of 15 kV/µs. The added capaci-
tance does not increase the fault output delay when a
desaturation condition is detected.
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
2
3
4
5
6
7
8
V
V
V
V
FAULT
FAULT
V
V
CATHODE
CATHODE
ANODE
ANODE
ANODE
ANODE
CATHODE
CATHODE
V
V
FAULT
V
CATHODE
ANODE
ANODE
CATHODE
S
S
CC1
CC1
S
S
S
CC1
S
DESAT
DESAT
DESAT
V
V
V
CLAMP
CLAMP
CLAMP
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
OUT
OUT
OUT
LED
LED
CC2
CC2
LED
CC2
V
V
V
EE
EE
EE
EE
EE
EE
E
E
E
16
16
15
15
14
14
13
13
12
12
11
11
10
10
16
15
14
13
12
11
10
9
9
9
V
V
V
100pF
CC
CC
CC
100 Ω
R
G
R
R
PULL-DOWN
PULL-DOWN
R
R
D
G
G
DESAT