ACPL-331J-500E Avago Technologies US Inc., ACPL-331J-500E Datasheet - Page 17

• Manufacturer Part Number: ACPL-331J-500E
• Description: Amplifier-Output Optocoupler,2-CHANNEL,3.75kV ISOLATION,SO
• Manufacturer: Avago Technologies US Inc.

Specifications of ACPL-331J-500E

• Voltage - Isolation: 3750Vrms
• Number Of Channels: 2, Bi-Directional
• Current - Output / Channel: 1.5A
• Propagation Delay High - Low @ If: 180ns @ 10mA
• Current - Dc Forward (if): 12mA
• Input Type: DC
• Output Type: Gate Driver, Miller Clamp
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application Information
Product Overview Description
The ACPL-331J
device that incorporates all the necessary components
for a complete, isolated IGBT / MOSFET gate drive circuit
with fault protection and feedback into one SO-16
package. Active Miller clamp function eliminates the
need of negative gate drive in most application and
allows the use of simple bootstrap supply for high side
driver. An optically isolated power output stage drives
IGBTs with power ratings of up to 100 A and 1200 V. A
high speed internal optical link minimizes the propaga-
tion delays between the microcontroller and the IGBT
while allowing the two systems to operate at very large
common mode voltage differences that are common
in industrial motor drives and other power switching
applications. An output IC provides local protection
for the IGBT to prevent damage during over current,
and a second optical link provides a fully isolated fault
status feedback signal for the microcontroller. A built
in “watchdog” circuit, UVLO monitors the power stage
supply voltage to prevent IGBT caused by insufficient
gate drive voltages. This integrated IGBT gate driver is
designed to increase the performance and reliability of
a motor drive without the cost, size, and complexity of a
discrete design.
Two light emitting diodes and two integrated circuits
housed in the same SO-16 package provide the input
control circuitry, the output power stage, and two optical
channels. The output Detector IC is designed manufac-
tured on a high voltage BiCMOS/Power DMOS process.
The forward optical signal path, as indicated by LED1,
transmits the gate control signal. The return optical signal
path, as indicated by LED2, transmits the fault status
feedback signal.
Under normal operation, the LED1 directly controls the
IGBT gate through the isolated output detector IC, and
LED2 remains off. When an IGBT fault is detected, the
output detector IC immediately begins a “soft” shutdown
sequence, reducing the IGBT current to zero in a con-
trolled manner to avoid potential IGBT damage from
inductive over voltages. Simultaneously, this fault status
is transmitted back to the input via LED2, where the fault
latch disables the gate control input and the active low
fault output alerts the microcontroller.
During power-up, the Under Voltage Lockout (UVLO)
feature prevents the application of insufficient gate
voltage to the IGBT, by forcing the ACPL-331J’s output
low. Once the output is in the high state, the DESAT (V
detection feature of the ACPL-331J provides IGBT pro-
tection. Thus, UVLO and DESAT work in conjunction to
provide constant IGBT protection.
17
is a highly integrated power control
CE
)
Figure 32. Block Diagram of ACPL-331J
Recommended Application Circuit
The ACPL-331J has an LED input gate control, and an
open collector fault output suitable for wired ‘OR’ ap-
plications. The recommended application circuit shown
in Figure 33 illustrates a typical gate drive implementa-
tion using the ACPL-331J. The following describes about
driving IGBT. However, it is also applicable to MOSFET.
Depending upon the MOSFET or IGBT gate threshold
requirements, designers may want to adjust the VCC
supply voltage (Recommended V
12.5V for MOSFET).
The two supply bypass capacitors (0.1 μF) provide the
large transient currents necessary during a switching
transition. Because of the transient nature of the charging
currents, a low current (5mA) power supply suffices. The
desaturation diode D
t
necessary external components for the fault detection
circuitry. The gate resistor R
current and controls the IGBT collector voltage rise
and fall times. The open collector fault output has a
passive pull-up resistor R
capacitor, C
V
(V
down when a fault is detected and fault reset by next
cycle of IGBT turn on. Application notes are mentioned at
the end of this datasheet.
CATHODE
rr
OUT
ANODE
FAULT
OH
below 75ns (e.g. ERA34-10) and capacitor C
V
CC1
V
S
). In this application, the IGBT gate driver will shut
provides a predictable high level output voltage
6, 7
5, 8
1, 4
2
3
SHIELD
LED1
F
. A 47 k: pull down resistor R
SHIELD
LED2
D
R
V
E
R
I
DESAT
F
DESAT
600V/1200V fast recovery type,
UVLO
(2.1 k:) and a 330 pF filtering
G
serves to limit gate charge
V
CLAMP
CC
= 17.5V for IGBT and
PULL-DOWN
BLANK
13
11
14
9, 12
10
16
15
V
V
DESAT
V
V
V
V
CC2
OUT
EE
CLAMP
E
LED
are
on