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PDF VLA503 Data sheet ( Hoja de datos )
| Número de pieza | VLA503 | |
| Descripción | Hybrid IC IGBT Gate Driver | |
| Fabricantes | Powerex Power Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de VLA503 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
VLA503
Hybrid IC
IGBT Gate Driver
A
B
C
J
D
1
K
H
G
14
L
E
F
4 VCC
LATCH
DETECT
CIRCUIT
2 CONTROL PIN
FOR ttrip
1 DETECT PIN
TIMER AND
14 RESET
CIRCUIT
INTERFACE
5 VO
OPTO COUPLER
180Ω
13
GATE
SHUTDOWN
CIRCUIT
8 FAULT OUTPUT
6 VEE
Outline Drawing and Circuit Diagram
Dimensions
Inches
Millimeters
A 2.0 51.0
B 1.02 26.0
C 0.4 10.0
D 0.45 11.5
E 0.12 3.0
F 0.3
7.5
G 0.25 6.5
H 0.10 2.54
J 0.02+0.006/-0.004 0.5+0.15/-0.1
K 0.18±0.06
4.5±1.5
L 0.01+0.01/-0.004 0.25+0.2/-0.1
Note: All dimensions listed are maximums except H, J,
K, and L.
3 , 7 , 9 , 10 PIN : NC
Description:
The VLA503 is a hybrid
integrated circuit designed to
provide optimum gate drive
for IGBT modules. This device
provides high current optically
isolated gate drive with a large
output voltage swing. The driver
also provides short circuit
protection based on desaturation
detection.
Features:
£ Electrical Isolation Voltage
Between Input and Output
with Opto-coupler
(2500 Vrms for 1 Minute)
£ Two Supply Driver Topology
£ Built-in Short-Circuit Protection
(With a Pin for Fault Output)
£ TTL Compatible Input Interface
Application:
To drive IGBT modules for inverter
or AC servo systems applications
Recommended IGBT Modules:
600V module up to 600A
1200V module up to 1400A
Rev. 2/06
1
1 page  
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
VLA503
Hybrid IC IGBT Gate Driver
General Description
The VLA503 is a hybrid integrated circuit designed
to provide gate drive for high power IGBT modules.
This circuit has been optimized for use with Powerex
NF-Series and A-Series IGBT modules. However,
the output characteristics are compatible with most
MOS gated power devices. The VLA503 features a
compact single-in-line package design. The upright
mounting minimizes required printed circuit board space
to allow efficient and flexible layout. The VLA503
converts logic level control signals into fully isolated
+15V/-8V gate drive with up to 5A of peak drive current.
Control signal isolation is provided by an integrated high
speed opto-coupler. Short circuit protection is provided
by means of destauration detection.
Short Circuit Protection
Figure 1 shows a block diagram of a typical desatura-
tion detector. In this circuit, a high voltage fast recovery
diode (D1) is connected to the IGBT’s collector to moni-
tor the collector to emitter voltage. When the IGBT is
in the off state, VCE is high and D1 is reverse biased.
With D1 off the (+) input of the comparator is pulled up
to the positive gate drive power supply (V+) which is
normally +15V. When the IGBT turns on, the compara-
tors (+) input is pulled down by D1 to the IGBT’s VCE(sat).
The (-) input of the comparator is supplied with a fixed
voltage (VTRIP). During a normal on-state condition
the comparator’s (+) input will be less than VTRIP and
it’s output will be low. During a normal off-state condi-
tion the comparator’s (+) input will be larger than VTRIP
V+
INPUT
DELAY
ttrip
+
COMPARE
D1
Vtrip
AND
SHUTDOWN
GATE
DRIVE
RG
G
IGBT
MODULE
C
E
Figure 1. Desaturation Detector
E
and it’s output will be high. If the IGBT turns on into a
short circuit, the high current will cause the IGBT’s col-
lector-emitter voltage to rise above VTRIP even though
the gate of the IGBT is being driven on. This abnormal
presence of high VCE when the IGBT is supposed to
be on is often called desaturation. Desaturation can
be detected by a logical AND of the driver’s input signal
and the comparator output. When the output of the AND
goes high a short circuit is indicated. The output of the
AND can be used to command the IGBT to shut down in
order to protect it from the short circuit. A delay (tTRIP)
must be provided after the comparator output to allow
for the normal turn on time of the IGBT. The tTRIP delay
is set so that the IGBTs VCE has enough time to fall
below VTRIP during normal turn on switching. If tTRIP
is set too short, erroneous desaturation detection will
occur. The maximum allowable tTRIP delay is limited by
the IGBT’s short circuit withstanding capability. In typical
applications using Powerex IGBT modules the recom-
mended limit is 10µs.
Operation of the VLA503 Desaturation Detector
The Powerex VLA503 incorporates short circuit pro-
tection using desaturation detection as described
above. A flow chart for the logical operation of the
short-circuit protection is shown in Figure 2. When a
desaturation is detected the hybrid gate driver performs
a soft shut down of the IGBT and starts a timed (ttimer)
1.5ms lock out. The soft turn-off helps to limit the tran-
sient voltage that may be generated while interrupting
the large short circuit current flowing in the IGBT. During
the lock out the driver pulls Pin 8 low to indicate the fault
status. Normal operation of the driver will resume after
the lock-out time has expired and the control input signal
returns to its off state.
Adjustment of Trip Time
The VLA503 has a default short-circuit detection
time delay (tTRIP) of approximately 2.5µs. This will
prevent erroneous detection of short-circuit conditions
as long as the series gate resistance (RG) is near the
minimum recommended value for the module being
used. The 2.5µs delay is appropriate for most applica-
tions so adjustment will not be necessary. However, in
some low frequency applications it may be desirable to
use a larger series gate resistor to slow the switching of
the IGBT, reduce noise, and limit turn-off transient volt-
ages. When RG is increased, the switching delay time
of the IGBT will also increase. If the delay becomes
Rev. 2/06
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet VLA503.PDF ] | |
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