June 2011 Doc ID 11095 Rev 2 1/18
18
TD352
Advanced IGBT/MOSFET driver
Features
■1.7 A sink / 1.3 A source (typ) current capability
■Active Miller clamp feature
■Desaturation detection
■Adjustable turn-on delay
■UVLO protection
■2k V ESD protection
Applications
■1200 V 3-phase inverter
■Motor control systems
■UPS
Description
This device is an advanced gate driver for IGBTs
and power MOSFETs. Control and protection
functions are included and allow the design of
high reliability systems.
The innovative active Miller clamp function
eliminates the need for negative gate drive in
most applications and allows the use of a simple
bootstrap supply for the high side driver.
The TD352 includes an adjustable turn-on delay.
This feature can be used to implement reliable
deadtime between high and low sides of a half
bridge. An external resistor and capacitor are
used to provide accurate timing.
SO-8
Table 1. Device summary
Order codes Temperature range Package Packaging
TD352ID -40°C, +125°C SO-8 Tube
TD352IDT Tape and reel
www.st.com
Contents TD352
2/18 Doc ID 11095 Rev 2
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Active Miller clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4 Turn-on delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.5 Desaturation protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.6 Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.7 Undervoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Typical performance curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
TD352 Block diagram
Doc ID 11095 Rev 2 3/18
1 Block diagram
Figure 1. TD352 block diagram
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Pin connections TD352
4/18 Doc ID 11095 Rev 2
2 Pin connections
Figure 2. Pin connections (top view)
Table 2. Pin description
Pin n° Name Type Function
IN 1 Analog input Input
VREF 2 Analog output +5 V reference voltage
CD 3 Timing capacitor Turn on delay
DESAT 4 Analog input Desaturation protection
CLAMP 5 Analog output Miller clamp
VL 6 Power supply Signal ground
OUT 7 Analog output Gate drive output
VH 8 Power supply Positive supply
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TD352 Absolute maximum ratings
Doc ID 11095 Rev 2 5/18
3 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VHL Maximum supply voltage (VH - VL) 28 V
Vout Voltage on OUT, CLAMP, DESAT pins VL-0.3 to VH+0.3 V
Vother Voltage on other pins (IN, CD, VREF) -0.3 to 7 V
Pd Power dissipation 500 mW
Tstg Storage temperature -55 to 150 °C
Tj Maximum junction temperature 150 °C
RthJA Thermal resistance junction-ambient 150 °C/W
ESD Electrostatic discharge (HBM) 2 kV
Table 4. Operating conditions
Symbol Parameter Value Unit
VH Positive supply voltage vs. VL UVLO to 26 V
Toper Operating free air temperature range -40 to 125 °C
Electrical characteristics TD352
6/18 Doc ID 11095 Rev 2
4 Electrical characteristics
TA = -20 to 125 °C, VH = 16 V, unless otherwise specified.
Table 5. Electrical characteristics
Symbol Parameter Test condition Min Typ Max Unit
Input
Vton IN turn-on threshold voltage 0.8 1.0 V
Vtoff IN turn-off threshold voltage 4.0 4.2 V
Iinp IN input current IN input voltage < 4.5V 1 µA
Voltage reference (1)
Vref Voltage reference T = 25°C 4.85 5.00 5.15 V
Iref Maximum output current 10 mA
Clamp
Vtclamp CLAMP pin voltage threshold 2.0 V
VCL Clamp low voltage Icsink = 500mA 2.5 V
Delay
Vtdel Voltage threshold 2.5 V
Rdel Discharge resistor I=1mA 500 Ω
Desaturation protection
Vdes Desaturation threshold VH-2 V
Ides Source current 250 µA
Output
Isink Output sink current Vout = 6V 1000 1700 mA
Isrc Output source current Vout = VH-6V 750 1300 mA
VOL1 Output low voltage 1 Iosink = 20mA 0.35 V
VOL2 Output low voltage 2 Iosink = 500mA 2.5 V
VOH1 Output high voltage 1 Iosource = 20mA VH-2.5 V
VOH2 Output high voltage 2 Iosource = 500mA VH-4.0 V
tr Rise time CL = 1nF, 10% to 90% 100 ns
tf Fall time CL = 1nF, 90% to 10% 100 ns
tdon Turn on propagation delay
10% OUT change:
Rd = 4.7kΩ, no Cd
Rd = 11kΩ, Cd = 220 pF 1.8 2.0
500
2.2
ns
µs
tdoff Turn off propagation delay 10% OUT change 400 ns
TD352 Electrical characteristics
Doc ID 11095 Rev 2 7/18
Under voltage lockout (UVLO)
UVLOH UVLO top threshold 10 11 12 V
UVLOL UVLO bottom threshold 9 10 11 V
Vhyst UVLO hysteresis UVLOH-UVLOL 0.5 1 V
Supply current
Iin Quiescent current OUT = 0V; no load 2.5 mA
1. Recommended capacitor range on VREF pin is 10 nF to 100 nF
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min Typ Max Unit
Functional description TD352
8/18 Doc ID 11095 Rev 2
5 Functional description
5.1 Input stage
The TD352 IN input is internally clamped at about 5 V to 7 V. The input is triggered by the
signal edge. When using an open collector optocoupler, the resistive pull-up resistor can be
connected to either VREF or VH.
Recommended pull-up resistor value with VH=16 V is from 4.7 kΩ to 22 kΩ.
5.2 Voltage reference
A voltage reference is used to create accurate timing for the turn-on delay with external
resistor and capacitor.
A decoupling capacitor (10 nF to 100 nF) on the VREF pin is required to ensure good noise
rejection.
5.3 Active Miller clamp
The TD352 offers an alternative solution to the problem of Miller current in IGBT switching
applications. Instead of driving the IGBT gate to a negative voltage to increase the safety
margin, the TD352 uses a dedicated CLAMP pin to control the Miller current. When the
IGBT is off, a low impedance path is established between the IGBT gate and emitter to carry
the Miller current, and the voltage spike on the IGBT gate is greatly reduced.
During turn-off, the gate voltage is monitored and the clamp output is activated when the
gate voltage goes below 2 V (relative to VL). The clamp voltage is VL+4V max for a Miller
current up to 500 mA. The clamp is disabled when the IN input is triggered again.
The CLAMP function does not affect the turn-off characteristic, but only keeps the gate at
low level throughout the off time. The main benefit is that negative voltage can be avoided in
many cases, allowing a bootstrap technique for the high side driver supply.
5.4 Turn-on delay
Turn-on (Ta) delay is programmable through external resistor Rd and capacitor Cd for
accurate timing. Ta is approximately given by (see Figure 5):
Ta (µs) = 0.7 * Rd (kΩ) * Cd (nF)
The turn-on delay can be disabled by connecting the CD pin to VREF with a 4.7 kΩ resistor.
Input signals with ON-time smaller than Ta are ignored.
TD352 Functional description
Doc ID 11095 Rev 2 9/18
5.5 Desaturation protection
Desaturation protection ensures the protection of the IGBT in the event of overcurrent.
When the DESAT voltage goes higher than VH-2V, the TD352 OUT pin is driven low. The
fault state is only exited after a power-down and power-up cycle.
A programmable blanking time is used to allow enough time for IGBT saturation. Blanking
time is provided by an internal current source and external Cdes capacitor. The Tbdes
blanking time value is given by:
Tbdes = Vdes * Cdes / Ides
At VH=16V, Tbdes is approximately given by:
Tbdes (µs) = 0.056 * Cdes (pF)
5.6 Output stage
The output stage is able to sink/source 1.7 A/1.3 A (typical) at 25 °C and 1.0 A/0.75 A min.
over the full temperature range. This current capability is specified near the usual IGBT
Miller plateau.
5.7 Undervoltage protection
Undervoltage detection protects the application in the event of a low VH supply voltage
(during startup or a fault situation). During undervoltage, the OUT pin is driven low (active
pull-down for VH>2V, and passive pull-down for VH<2V).
Figure 3. Undervoltage protection
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Functional description TD352
10/18 Doc ID 11095 Rev 2
Figure 4. Detailed internal schematic
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TD352 Timing diagrams
Doc ID 11095 Rev 2 11/18
6 Timing diagrams
Figure 5. General turn-on and turn-off sequence
Figure 6. Input and output waveform dynamic parameters
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Timing diagrams TD352
12/18 Doc ID 11095 Rev 2
Figure 7. Desaturation fault
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TD352 Typical performance curves
Doc ID 11095 Rev 2 13/18
7 Typical performance curves
Figure 8. Quiescent current vs temperature Figure 9. Rdel resistance vs temperature
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Typical performance curves TD352
14/18 Doc ID 11095 Rev 2
Figure 12. Sink current vs temperature Figure 13. Source current vs temperature
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TD352 Application diagrams
Doc ID 11095 Rev 2 15/18
8 Application diagrams
Figure 14. Single supply IGBT drive with active Miller clamp and DESAT protection
Figure 15. Use of DESAT input for direct overcurrent detection
Figure 16. Large IGBT drive with negative voltage gate drive and optional current
buffers
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Package mechanical data TD352
16/18 Doc ID 11095 Rev 2
9 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 17. SO-8 mechanical drawing
Table 6. SO-8 mechanical data
Dim.
mm. inch
Min. Typ Max. Min. Typ. Max.
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k (max.) 8
ddd 0.1 0.04
#
TD352 Revision history
Doc ID 11095 Rev 2 17/18
10 Revision history
Table 7. Document revision history
Date Revision Changes
01-Nov-2004 1 Initial release
13-Jun-2011 2 Deleted order code TD352IN.
Content reworked to improve readability.
TD352
18/18 Doc ID 11095 Rev 2
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