Power integrations 2SC0108T2Dx-xx User manual

SCALE™-2 2SC0108T2Dx-xx
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SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
Dual Channel Ultra-compact Low-cost SCALE™-2 Driver Core
Abstract
The new low-cost SCALE™-2 dual-driver core 2SC0108T2Dx-xx combines unrivalled compactness with broad
applicability. The driver was designed for universal applications requiring high reliability. The 2SC0108T2Dx-xx
drives all usual IGBT modules up to 650V (2SC0108T2Dx-07) or 1200V (2SC0108T2Dx-12). The embedded
paralleling capability allows easy inverter design covering higher power ratings. Multi-level topologies are also
supported.
The 2SC0108T2Dx-xx is the most compact driver core available for industrial applications, with a footprint of
only 45mm x 34.3mm and an insertion height of max. 16mm. It allows even the most restricted insertion
spaces to be efficiently used.
Fig. 1 2SC0108T2Dx-xx driver core

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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Contents
Abstract.......................................................................................................................................... 1
Contents ......................................................................................................................................... 2
Driver Overview ............................................................................................................................. 4
Mechanical Dimensions.................................................................................................................. 5
Pin Designation .............................................................................................................................. 7
Recommended Interface Circuitry for the Primary Side Connector .............................................. 8
Description of Primary Side Interface ........................................................................................... 8
General...............................................................................................................................8
VCC terminal .......................................................................................................................8
MOD (mode selection) .........................................................................................................9
INA, INB (channel drive inputs, e.g. PWM)........................................................................... 10
SO1, SO2 (status outputs).................................................................................................. 10
TB (input for adjusting the blocking time Tb)........................................................................ 10
Recommended Interface Circuitry for the Secondary Side Connectors ...................................... 11
Description of Secondary Side Interfaces.................................................................................... 11
General............................................................................................................................. 11
Emitter terminal (VEx)........................................................................................................ 11
Active clamping (ACLx) ...................................................................................................... 12
Collector sense (VCEx) with resistors................................................................................... 12
Desaturation protection with sense diodes ........................................................................... 14
Disabling the VCE,sat detection.............................................................................................. 16
Gate turn-on (GHx) and turn-off (GLx) terminals .................................................................. 16
How Do 2SC0108T2Dx-xx SCALE-2 Drivers Work in Detail? ....................................................... 17
Power supply and electrical isolation ................................................................................... 17
Power-supply monitoring.................................................................................................... 17
Parallel connection of 2SC0108T2Dx-xx ............................................................................... 17
3-level or multilevel topologies............................................................................................ 17
Additional application support for 2SC0108T2Dx-xx .............................................................. 17
Bibliography ................................................................................................................................. 18
The Information Source: SCALE-2 Driver Data Sheets ................................................................ 19
Quite Special: Customized SCALE-2 Drivers ................................................................................ 19
Technical Support ........................................................................................................................ 19
Quality..........................................................................................................................................19

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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Legal Disclaimer ........................................................................................................................... 19
Ordering Information................................................................................................................... 20
Information about Other Products .............................................................................................. 20
Manufacturer................................................................................................................................ 20
Power Integrations Worldwide High Power Customer Support Locations.................................. 21

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
www.power.com/igbt-driver Page 4
Driver Overview
The 2SC0108T2Dx-xx is a low cost driver core equipped with Power Integrations' latest SCALE-2 chipset /1/.
The SCALE-2 chipset is a set of application-specific integrated circuits (ASICs) that cover the main range of
functions needed to design intelligent gate drivers. The SCALE-2 driver chipset is a further development of the
proven SCALE technology /2/.
The 2SC0108T2Dx-xx targets low- and medium-power, dual-channel IGBT applications such as general
purpose drives, UPS, solar converters and automotive applications. The 2SC0108T2Dx-xx comprises a
complete dual-channel IGBT driver core, fully equipped with an isolated DC/DC converter, short-circuit
protection, advanced active clamping and supply-voltage monitoring.
Fig. 2 Block diagram of the driver core 2SC0108T2Dx-xx

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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Mechanical Dimensions
Fig. 3 Interactive 3D drawing of 2SC0108T2Dx-xx

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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Fig. 4 Mechanical drawing of 2SC0108T2Dx-xx
The primary side and secondary side pin grid is 2.54mm (100mil) with a pin cross section of
0.64mm x 0.64mm. Total outline dimensions of the board are 34.3mm x45mm. The total height of the
driver is max. 16mm measured from the bottom of the pin bodies to the top of the populated PCB.
Recommended diameter of solder pads: Ø 2mm (79 mil)
Recommended diameter of drill holes: Ø 1mm (39 mil)

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
www.power.com/igbt-driver Page 7
Pin Designation
Pin No. and Name
Function
Primary Side
1
GND
Ground
2
INA
Signal input A; non-inverting input relative to GND
3
INB
Signal input B; non-inverting input relative to GND
4
VCC
Supply voltage; 15V supply for primary side
5
TB
Set blocking time
6
SO2
Status output channel 2; normally high-impedance, pulled down to low on fault
7
SO1
Status output channel 1; normally high-impedance, pulled down to low on fault
8
MOD
Mode selection (direct/half-bridge mode)
Secondary Sides
9
GH1
Gate high channel 1; pulls gate high through turn-on resistor
10
VE1
Emitter channel 1; connect to (auxiliary) emitter of power switch
11
GL1
Gate low channel 1; pulls gate low through turn-off resistor
12
ACL1
Active clamping feedback channel 1; leave open if not used
13
14
15
16
VCE1
Free
Free
Free
VCE sense channel 1; connect to IGBT collector through resistor network
17
GH2
Gate high channel 2; pulls gate high through turn-on resistor
18
VE2
Emitter channel 2; connect to (auxiliary) emitter of power switch
19
GL2
Gate low channel 2; pulls gate low through turn-off resistor
20
ACL2
Active clamping feedback channel 2; leave open if not used
21
VCE2
VCE sense channel 2; connect to IGBT collector through resistor network
Note: Pins with the designation “Free” are not physically present.

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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Recommended Interface Circuitry for the Primary Side Connector
Fig. 5 Recommended user interface of 2SC0108T2Dx-xx (primary side)
Description of Primary Side Interface
General
The primary side interface of the driver 2SC0108T2Dx-xx is very simple and easy to use.
The driver primary side is equipped with an 8-pin interface connector with the following terminals:
1 x power-supply terminal
2 x drive signal inputs
2 x status outputs (fault returns)
1 x mode selection input (half-bridge mode / direct mode)
1 x input to set the blocking time
All inputs and outputs are ESD-protected. Moreover, all digital inputs have Schmitt-trigger characteristics.
VCC terminal
The driver has one VCC terminal on the interface connector. It supplies the primary side electronics as well as
the DC-DC converter to supply the secondary sides with 15V.
The driver limits the inrush current at startup and no external current limitation of the voltage source for VCC
is needed.

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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MOD (mode selection)
The MOD input allows the operating mode to be selected with a resistor connected to GND.
Direct mode
If the MOD input is connected to GND, direct mode is selected. In this mode, there is no interdependence
between the two channels. Input INA directly influences channel 1 while INB influences channel 2. High level
at an input (INA or INB) always results in turn-on of the corresponding IGBT. In a half-bridge topology, this
mode should be selected only when the dead times are generated by the control circuitry so that each IGBT
receives its own drive signal.
Caution: Synchronous or overlapping timing of both switches of a half-bridge basically shorts the DC-link.
Half-bridge mode
If the MOD input is connected to GND with a resistor 71k<Rm<181k, half-bridge mode is selected. In this
mode, the inputs INA and INB have the following functions: INA is the drive signal input while INB acts as the
enable input (see Fig. 6). It is recommended to place a capacitor Cm=22nF in parallel to Rmin order to reduce
the deviation between the dead times at the rising and falling edges of INA respectively.
When input INB is low level, both channels are blocked. If it goes high, both channels are enabled and follow
the signal on the input INA. At the transition of INA from low to high, channel 2 turns off immediately and
channel 1 turns on after a dead time Td.
Fig. 6 Signals in half-bridge mode
The value of the dead time Tdis determined by the value of the resistor Rmaccording to the following formula
(typical value):
4.56][33][  sTkR dm 
with 0.5μs<Td<3.8μs and 73kΩ<Rm<182kΩ

SCALE™-2 2SC0108T2Dx-xx
Preliminary Description & Application Manual
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INA, INB (channel drive inputs, e.g. PWM)
INA and INB are basically drive inputs, but their function depends on the MOD input (see above). They safely
recognize signals in the whole logic-level range between 3.3V and 15V. Both input terminals feature Schmitt-
trigger characteristics (refer to the driver data sheet /3/). An input transition is triggered at any edge of an
incoming signal at INA or INB.
SO1, SO2 (status outputs)
The outputs SOx have open-drain transistors. When no fault condition is detected, the outputs have high
impedance. An internal current source of 500μA pulls the SOx outputs to a voltage of about 4V when leaved
open. When a fault condition (primary side supply undervoltage, secondary side supply undervoltage, IGBT
short circuit) is detected, the corresponding status output SOx goes to low (connected to GND).
The diodes D1and D2must be Schottky diodes and must only be used when using 3.3V logic. For 5V…15V
logic, they can be omitted.
The maximum SOx current in a fault condition must not exceed the value specified in the driver data sheet
/3/.
Both SOx outputs can be connected together to provide a common fault signal (e.g. for one phase). However,
it is recommended to evaluate the status signals individually to allow fast and precise fault diagnosis.
How the status information is processed
a) A fault on the secondary side (detection of short circuit of IGBT module or supply undervoltage) is
transmitted to the corresponding SOx output immediately. The SOx output is automatically reset
(returning to a high impedance state) after a blocking time Tbhas elapsed (refer to “TB (input for
adjusting the blocking time Tb)” for timing information).
b) A supply undervoltage on the primary side is indicated to both SOx outputs at the same time. Both SOx
outputs are automatically reset (returning to a high impedance state) when the undervoltage on the
primary side disappears.
TB (input for adjusting the blocking time Tb)
The terminal TB allows the blocking time Tbto be set by connecting a resistor Rbto GND (see Fig. 5). The
following equation calculates the value of Rbconnected between pins TB and GND in order to program the
desired blocking time Tb(typical value):
51][0.1][  msTkR bb
with 20ms<Tb<130ms and 71kΩ<Rb<181kΩ
The blocking time can also be set to a minimum of 9µs (typical) by selecting Rb=0Ω. The terminal TB must not
be left floating.
Note: It is also possible to apply a stabilized voltage at TB. The following equation is used to calculate the
voltage Vbbetween TB and GND in order to program the desired blocking time Tb(typical value):
02.1][02.0][  msTVV bb
with 20ms<Tb<130ms and 1.42<Vb<3.62V