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ACPL-344JT 데이터시트 PDF




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부품번호 ACPL-344JT 기능
기능 Automotive 2.5A Gate-Drive Optocoupler
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ACPL-344JT 데이터시트, 핀배열, 회로
ACPL-344JT
Automotive 2.5A Gate-Drive Optocoupler
with Integrated IGBT Desat Overcurrent Sensing,
Miller-Current Clamping, and Under-Voltage Lockout Feedback
Data Sheet
Description
The Avago Technologies Automotive 2.5A Gate-Drive
Optocoupler features fast propagation delay with
excellent timing-skew performance. Smart features that
are integrated to protect the IGBT include IGBT
desaturation sensing with soft-shutdown protection
and fault feedback, under-voltage lockout and feedback,
and active Miller-current clamping. This full-featured
and easy-to-implement IGBT gate-drive optocoupler
comes in a compact, surface-mountable SO-16 package
for space savings. It is suitable for traction power-train
inverter, power converter, battery charger, air-con, and
oil-pump motor drives in HEV and EV applications and
satisfies automotive AEC-Q100 semiconductor
requirements.
Avago's R2Coupler isolation products provide reinforced
insulation and reliability that deliver safe-signal isolation
critical in automotive and high-temperature industrial
applications.
Functional Diagram
VE VCC2
13 12
VCC1 3
UVLO
/UVLO 5
/FAULT 6
VEE1 1
NC 2
NC 4
AN 7
CA 8
Input
Driver
Output
Driver
CuOrvreernt
SS Control
Miller Control
Figure 1. ACPL-344JT Functional Diagram.
9 16
VEE2 VEE2
15 LED2+
14 DESAT
11 VO
10 SSD/
CLAMP
Features
• Qualified to AEC-Q100 Grade 1 Test Guidelines
• Automotive temperature range: –40°C to +125°C
• Common Mode Rejection (CMR): >50 kV/μs at
VCM = 1500V
• High Noise Immunity:
– Miller-Current Clamping
– Direct LED input with low-input impedance and
low-noise sensitivity
– Negative Gate Bias
• Peak output current: 2.5A max.
• Miller Clamp-Sinking Current: 1.9A max.
• Wide Operating Voltage: 15V to 25V
• Propagation delay: 250 ns max.
• Integrated fail-safe IGBT protection
– Desat sensing, 'Soft' IGBT turn-off, and Fault
Feedback
– Under-Voltage Lock-Out protection (UVLO) with
Feedback
• SO-16 package with 8 mm clearance and creepage
• Regulatory approvals:
– UL1577, CSA
– IEC/EN/DIN EN 60747-5-5
Applications
• Automotive isolated IGBT/MOSFET inverter gate drive
• Automotive DC-DC converter
• AC and brushless-DC motor drives
• Industrial inverters for power supplies and motor
controls
• Uninterruptible power supplies (UPS)
CAUTION: It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD.




ACPL-344JT pdf, 반도체, 판매, 대치품
Typical Application/Operation
Introduction to Fault Detection and Protection
The power stage of a typical three-phase inverter is susceptible to several types of failures, most of which are
potentially destructive to the power IGBTs. These failure modes can be grouped into four basic categories: phase and
rail supply short circuits due to user misconnect or bad wiring, control signal failures due to noise or computational
errors, overload conditions induced by the load, and component failures in the gate-drive circuitry. Under any of these
fault conditions, the current through the IGBTs can increase rapidly, causing excessive power dissipation and heating.
The IGBTs become damaged when the current load approaches the saturation current of the device, and the
collector-to-emitter voltage rises above the saturation voltage level. The drastically increased power dissipation
quickly overheats the power device and destroys it. To prevent damage to the drive, fault protection must be
implemented to reduce or turn-off the overcurrent during a fault condition.
A circuit providing fast local-fault detection and shutdown is an ideal solution, but the number of required
components, board space consumed, cost, and complexity have, until now, limited its use to high performance drives.
The features this circuit must have include high speed, low cost, low resolution, low power dissipation, and small size.
The ACPL-344JT satisfies these criteria by combining a high-speed, high-output current driver, high-voltage optical
isolation between the input and output, local IGBT desaturation detection and shut down, and optically isolated fault
and UVLO-status feedback signal into a single 16-pin surface-mount package.
The fault-detection method adopted in the ACPL-344JT monitors the saturation (collector) voltage of the IGBT and
triggers a local-fault shutdown sequence if the collector voltage exceeds a predetermined threshold. A small gate-
discharge device slowly reduces the high short-circuit IGBT current to prevent damaging voltage spikes. Before the
dissipated energy can reach destructive levels, the IGBT is shut off. During the off state of the IGBT, the fault detect
circuitry is simply disabled to prevent false ‘fault’ signals.
The alternative protection scheme of measuring IGBT current to prevent desaturation is effective if the short-circuit
capability of the power device is known, but this method will fail if the gate-drive voltage decreases enough to only
partially turn on the IGBT. By directly measuring the collector voltage, the ACPL-344JT limits the power dissipation
in the IGBT even with insufficient gate-drive voltage. Another more subtle advantage of the desaturation detection
method is that power dissipation in the IGBT is monitored, while the current sense method relies on a preset current
threshold to predict the safe limit of operation. Therefore, an overly- conservative overcurrent threshold is not required
to protect the IGBT.
Recommended Application Circuit
The ACPL-344JT has non-inverting gate-control inputs, and an open-collector fault and UVLO outputs suitable for
wired-OR applications.
The recommended application circuit shown in Figure 3 shows a typical gate-drive implementation using the ACPL-
344JT.
The two supply bypass capacitors (1.0 μF minimum) provide the large transient currents necessary during a switch-
ing transition. The Desat diode and 220 pF blanking capacitor are the necessary external components for the fault
detection circuitry. The gate resistor (10Ω) serves to limit gate-charge current and indirectly control the IGBT collector
voltage rise-and-fall times. The open-collector fault and UVLO outputs have a passive 10 kΩ pull-up resistor and a 330
pF filtering capacitor.
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ACPL-344JT 전자부품, 판매, 대치품
The ACPL-344JT is approved by the following organizations:
UL
Approved under
UL 1577, component recognition
program up to VISO = 5000VRMS
CSA
Approved under
CSA Component Acceptance Notice #5,
File CA 88324.
IEC/EN/DIN EN 60747-5-5
Approved under
IEC 60747-5-5
EN 60747-5-5
DIN EN 60747-5-5
IEC/EN/DIN EN 60747-5-5 Insulation Characteristics
Description
Symbol Characteristic Unit
Insulation Classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage ≤ 150VRMS
for rated mains voltage ≤ 300VRMS
for rated mains voltage ≤ 600VRMS
for rated mains voltage ≤ 1000VRMS
Climatic Classification
I – IV
I – IV
I – IV
I – III
40/125/21
Pollution Degree (DIN VDE 0110/1.89)
2
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b
VIORM × 1.875 = VPR, 100% Production Test with tm = 1 sec,
Partial discharge < 5 pC
VIORM
VPR
1230
2306
VPEAK
VPEAK
Input to Output Test Voltage, Method a
VIORM × 1.6 = VPR, Type and Sample Test, tm = 10 sec,
Partial Discharge < 5 pC
VPR 1968
VPEAK
Highest Allowable Overvoltage (Transient Overvoltage tini = 60 sec)
VIOTM
8000
VPEAK
Safety-limiting values – maximum values allowed in the event of a failure (also see Figure 7)
Case Temperature
Input Power
Output Power
TS
PS,INPUT
PS,OUTPUT
175
400
1200
°C
mW
mW
Insulation Resistance at TS, VIO = 500 V
RS >109
Notes:
1. Isolation characteristics are guaranteed only within the safety maximum ratings which must be ensured by protective circuits in application.
Surface mount classification is class A in accordance with CECCOO802.
2. Refer to the optocoupler section of the Isolation and Control Components Designer’s Catalog, under Product Safety Regulation section IEC/EN/DIN
EN 60747-5-5, for a detailed description of Method a and Method b partial-discharge test profiles.
1400
1200
PS, Output
PS, Input
1000
800
600
400
200
0 0 25
50 75 100 125 150 175
TS—Case Temperature (°C)
Figure 7. Dependence of safety limiting values on temperature.
200
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ACPL-344JT

Automotive 2.5A Gate-Drive Optocoupler

AVAGO
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