VLA503中文资料
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
Hybrid IC
IGBT Gate Driver
VLA503
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 V rms for 1 Minute)￡ Two Supply Driver T opology ￡ 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
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.
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
VLA503
Hybrid IC IGBT Gate Driver
Absolute Maximum Ratings, T a = 25°C unless otherwise speci?ed
Characteristics Symbol VLA503 Units Supply Voltage, DC V CC 18 Volts
V EE-15 Volts Input Signal Voltage (Applied between Pin 13 - 14, 50% Duty Cycle, Pulse Width 1ms) V i -1 ~ +7 Volts Output Voltage (When the Output Voltage is "H") V O V CC Volts Output Current I OHP-5 Amperes (Pulse Width 2μs, f ≤ 20kHz) I OLP 5 Amperes Isolation Voltage (Sine Wave Voltage 60Hz, for 1 Minute) V ISO2500 V rms Case Temperature T C85 °C Operating Temperature (No Condensation Allowable) T opr-20 ~ +60 °C Storage Temperature (No Condensation Allowable) T stg-25 ~ +100* °C Fault Output Current (Applied Pin 8) I FO 20 mA Input Voltage at Pin 1 (Applied Pin 1) V R1 50 Volts *Differs from H/C condition.
Electrical and Mechanical Characteristics, T a = 25°C unless otherwise speci?ed, V CC = 15V, V EE = -10V) Characteristics Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Recommended Range 14 15 — Volts
V EE Recommended Range -7 — -10 Volts Pull-up Voltage on Primary Side V IN Recommended Range 4.75 5 5.25 Volts "H" Input Current I IH Recommended Range 15.2 16 19 mA Switching Frequency f Recommended Range — — 20 kHz Gate Resistance R G Recommended Range 2 — — Ω"H" Input Current I IH V IN = 5V — 16 — mA "H" Output Voltage V OH13 14 — Volts "L" Output Voltage V OL-8 -9 — Volts "L-H" Propagation Time t PLH I IH = 16mA — 0.5 1 μs "L-H" Rise Time t r I IH = 16mA — 0.3 1 μs "H-L" Propagation Time t PHL I IH = 16mA — 1 1.3 μs "H-L" Fall Time t f I IH = 16mA — 0.3 1 μs Timer t timer Between Start and Cancel 1 — 2 ms
(Under Input Sign "L")
Fault Output Current I FO Applied 8 Pin, R = 4.7kΩ— 5 — mA Controlled Time Detect Short-Circuit 1 t trip1Pin 1: 15V and More, Pin 2: Open — 2.6 — μs Controlled Time Detect Short-Circuit 2** t trip2Pin 1: 15V and More, Pins 2-4: 10pF — 3 — μs
(Connective Capacitance)
SC Detect Voltage V SC Collector Voltage of Module 15 — — Volts **Length of wiring capacitor controlled time detect short-circuit is within 5cm from Pin 2 and Pin 4 coming and going.
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272 VLA503
Hybrid IC IGBT Gate Driver
Application Circuit
CONTROL
FAULT
CONTROL
FAULT
VLA503
Hybrid IC IGBT Gate Driver
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
020604080AMBIENT TEMPERATURE, T a , (°C)
010302040
SUPPL Y VOLTAGE, V CC , (VOLTS)
(PIN: 4 – 6)
1.01.6
1.41.20.80.60.20.4P R O P A G A T I O N D E L A Y T I M E “L -H ”, t P L H , (μs )P R O P A G A T I O N D E L A Y T I M E “H -L ”, t P H L , (μs )
095678
4320
257510012550150CONNECTIVE CAPACITANCE, C trip , (p F )
(PIN: 2 – 4)
C O N T R O L L E
D T I M
E S H O R T -C I R C U I T D E T E C T , t t r i p , (μs )
01PROPAGATION DELAY TIME VS. AMBIENT CHARACTERISTICS
(TYPICAL)PROPAGATION DELAY TIME VS. INPUT VOLTAGE CHARACTERISTICS
(TYPICAL)PROPAGATION DELAY TIME VS.
AMBIENT TEMPERATURE CHARACTERISTICS
(TYPICAL)
SWITCHING TIME DEFINITIONS
V IN
(PIN 14 TO 13)
V O
(PIN 5 TO 6)
VLA503
Hybrid IC IGBT Gate Driver
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
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 ef?cient and ?exible 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, V CE 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 V CE(sat). The (-) input of the comparator is supplied with a ?xed voltage (V TRIP). During a normal on-state condition the comparator’s (+) input will be less than V TRIP and it’s output will be low. During a normal off-state condi-tion the comparator’s (+) input will be larger than V TRIP 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 V TRIP even though the gate of the IGBT is being driven on. This abnormal presence of high V CE 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 (t TRIP) must be provided after the comparator output to allow for the normal turn on time of the IGBT. The t TRIP delay is set so that the IGBTs V CE has enough time to fall below V TRIP during normal turn on switching. If t TRIP is set too short, erroneous desaturation detection will occur. The maximum allowable t TRIP 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 ?ow 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 (t timer)
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 ?owing 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 (t TRIP) of approximately 2.5μs. This will prevent erroneous detection of short-circuit conditions as long as the series gate resistance (R G) 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 R G is increased, the switching delay time of the IGBT will also increase. If the delay becomes
INPUT
Figure 1. Desaturation Detector
VLA503
Hybrid IC IGBT Gate Driver
Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272
Figure 2. VLA503-01 Desaturation Detector
V Figure 3. Adjustment of t trip
long enough so that the voltage on the detect Pin 1 is greater than V SC at the end of the t TRIP delay the driver will erroneously indicate that a short circuit has occurred. T o avoid this condition the VLA503 has provisions for extending the t TRIP delay by connecting a capacitor (C TRIP ) between Pin 2 and V CC (Pins 4). The effect of adding C TRIP on trip time is shown in Figure 3. If t TRIP is extended care must be exercised not to exceed the short-circuit withstanding capability of the IGBT mod-ule. Normally this will be satis?ed for Powerex NF and A-Series IGBT modules as long as the total shut-down time does not exceed 10μs.