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PDF TK75050DITL Data sheet ( Hoja de datos )
| Número de pieza | TK75050DITL | |
| Descripción | SMART MOSFET DRIVER | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK75050
SMART MOSFET DRIVER
FEATURES
s 20 ns Rise and Fall Times into 1000 pF
s 550 µA Standby Current Consumption
s Undervoltage Lockout Combined with First Pulse
Wake-Up Feature *
s Cycle-by-Cycle Current Limiting
s Current Sense Voltage Spike Cancellation when
Used with Gate Charge Recovery Circuit *
s Thermal Overload Protection
s TTL/CMOS Compatible Input
DESCRIPTION
APPLICATIONS
s Driving of Power MOSFETs and IGBTs
s Switch Mode Power Supplies
s Step Motor Drivers
s Solenoid Drivers
The TK75050 is a non-inverting buffer to drive high power
insulated gate transistors (e.g., MOSFETs and IGBTs).
The output can source or sink 2 A into a 10,000 pF
equivalent load. The IC features built-in cycle-by-cycle
current limiting. Its Undervoltage Lockout (UVLO) circuit is
combined with a First Pulse Wake-up Feature*. The chip
has thermal overload protection. Using the IC in the Gate
Charge Recovery* application, the switching spike
developed across the current sense resistor practically
becomes negligible. Due to its low standby current and
first-pulse wake-up feature, the device can be used in self-
biased power supplies. The IC's high-speed cycle-by-
cycle current limiting capability eliminates the short circuit
runaway problem which characterizes most current-
controlled converters. The IC is well suited to provide
supplementary overload protection in voltage-controlled
converters, too. The TK75050 is available in the widely
used 8-pin DIP package.
*Toko proprietary feature: See "Application Information" section.
TK75050
75050
PGND/CS
GND
GND
OUTPUT
INPUT
GND
GND
VCC
BLOCK DIAGRAM
ORDERING INFORMATION
TK75050D
Tape/Reel Code
Temperature Code
PACKAGE CODE EXTENDED TEMP. RANGE TAPE/REEL CODE
D: DIP-8
I: -40 TO +85 C
TL: Tape Left
INPUT
1.6/1.0 V
GND
T
155/80 °C
UVLO
STARTUP
R
Q
S
11/10 V
EN
BIAS
EN
OVERLOAD
R
SQ
CURRENT
OVERLOAD
THERMAL
OVERLOAD
1.0/0.9 V
VCC
OUTPUT
PGND/CS
January 1999 TOKO, Inc.
Page 1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
TK75050
SUPPLY CURRENT VS.
TEMPERATURE
20
VCC = 12 V
NO LOAD CONNECTED
18
ICC(L)
16
ICC(H)
14
12
10
-25
25 75
TA (°C)
125
SUPPLY CURRENT VS.
SUPPLY VOLTAGE
20
TA = 25 °C
NO LOAD CONNECTED
15
ACTIVE MODE
10
5
SLEEP MODE
0
2 6 10
VCC (V)
14
10.8
10.6
10.4
OUTPUT VOLTAGE VS.
TEMPERATURE
VCC = 12 V
NO LOAD CONNECTED
VOUT(H)
10.2
0.2
0.0
-25
VOUT(L)
25 75
TA (°C)
125
STANDBY CURRENT VS.
TEMPERATURE
700
NO LOAD CONNECTED
600
500
400
VCC = 10 V
VCC = 12 V
300
200
-25
VCC = 5 V
25 75
TA (°C)
125
11.5
11.0
UVLO THRESHOLD VS.
TEMPERATURE
VCC(ON)
10.5
10.0
VCC(OFF)
9.5
-25
25 75
TA (°C)
125
CURRENT LIMIT THRESHOLD VS.
TEMPERATURE
1.2
VCC = 12 V
VIN = VIN(H)
1.0
0.8
0.6
-25
25 75
TA (°C)
125
January 1999 TOKO, Inc.
AVERAGE SUPPLY CURRENT VS.
FREQUENCY
20
VCC = 12 V
NO LOAD CONNECTED
18
16 TA = 25 °C
14 TA = 125 °C
12
10
0.01
0.1 1 10 100 1000
FREQUENCY (kHz)
INPUT THRESHOLD VS.
TEMPERATURE
2.0
VCC = 12 V
1.6 VIN(H)
1.2
VIN(L)
0.8
-25
25 75
TA (°C)
125
RISE AND FALL TIME VS.
TEMPERATURE
28
VCC = 12 V
CL = 1000 pF
24
tF
20
tR
15
-25
25 75
TA (°C)
125
Page 5
5 Page 
TK75050
APPLICATION INFORMATION (CONT.)
Figures 9 and 10 show the measured voltages across Q1
(top trace) and the currents in Q1 (bottom trace). Figure 9
shows the wave forms when there is no inductor in series
with Q1 (i.e., L1 is shorted). Figure 10 shows the waveforms
when there is an inductor in series with Q1 (i.e., L1 is not
shorted). The vertical scales are 100 V/div. (top trace) and
1 A/div (bottom trace). The horizontal scales are 25 ns/div.
As can be seen, the peak currents stay below 2.5 A
(Figure 9) or 2.8 A (Figure 10). Those numbers correspond
to 25% or 40% overshoots above the nominal current-limit
threshold of 2 A. Both figures show that the IC shuts off the
MOSFET completely in less than 50 ns after the current
passed the 2 A threshold. The measured average DC
current consumption at a bus voltage of 400 V and a
switching frequency of 30 kHz is 4.3 mA when L1 is shorted
(Figure 9) and 5.3 mA when L1 is not shorted (Figure 10).
SAFETY CONSIDERATIONS/LIABILITY DISCLAIMER
Dangerous voltages are present in the demo board.
Extreme caution must be used when using and testing the
circuit. Only trained personnel, experienced in working
with high voltages and power, should operate it. Use an
isolating transformer between the line and the circuit if any
grounded instrument (including the 20 V auxiliary supply
for the square-wave generator at the primary side of
transformer T1) is to be connected to the board. Note:
Although the two windings of transformer T1 are isolated
from each other, the transformer is not designed to provide
safety isolation between those windings.
Toko, Inc. disclaims any and all liability arising from use or
misuse of the demo board described herein.
400V
0V
25ns/div.
FIGURE 9
2A
0A
400V
0V
25ns/div.
FIGURE 10
January 1999 TOKO, Inc.
2A
0A
Page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TK75050DITL.PDF ] | |
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