Power integrations Scale-2+ 2SC0435T Gebrauchsanweisung

SCALE™-2+ 2SC0435T

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SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

Dual-Channel High-power IGBT Driver

Abstract

The new SCALE™-2+ dual-driver core 2SC0435T combines unrivalled compactness with broad applicability.

The driver was designed for universal applications requiring high reliability. The 2SC0435T drives all usual

high-power IGBT modules up to 1700V. The embedded paralleling capability allows easy inverter design

covering higher power ratings. Multi-level topologies are also supported.

The 2SC0435T is the most compact driver core in its power range available for industrial applications, with a

footprint of only 57.2mm x 51.6mm and an insertion height of max. 20.5mm. It allows even the most

restricted insertion spaces to be efficiently used.

Fig. 1 2SC0435T driver core

SCALE™-2+ 2SC0435T

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

VDC terminal....................................................................................................................... 9

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

DC/DC output (VISOx), emitter (VEx) and COMx terminals.................................................... 12

Reference terminal (REFx).................................................................................................. 12

Collector sense (VCEx) ....................................................................................................... 12

Active clamping (ACLx) ...................................................................................................... 12

Gate turn-on (GHx) and turn-off (GLx) terminals .................................................................. 13

How Do 2SC0435T SCALE-2+ Drivers Work in Detail? ................................................................ 14

Power supply and electrical isolation ................................................................................... 14

Power-supply monitoring.................................................................................................... 14

VCE monitoring / short-circuit protection............................................................................... 15

Desaturation protection with sense diodes ........................................................................... 16

Parallel connection of 2SC0435T ......................................................................................... 16

3-level or multilevel topologies............................................................................................ 16

Additional application support for 2SC0435T ........................................................................ 16

Electrical Ratings for UL recognized types .................................................................................. 16

Bibliography ................................................................................................................................. 17

The Information Source: SCALE-2 and SCALE-2+ Driver Data Sheets ........................................ 17

Quite Special: Customized SCALE-2 and SCALE-2+ Drivers ........................................................ 17

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

www.power.com/igbt-driver Page 3

Technical Support ........................................................................................................................ 17

Quality.......................................................................................................................................... 17

Legal Disclaimer ........................................................................................................................... 18

Ordering Information................................................................................................................... 19

Information about Other Products .............................................................................................. 19

Power Integrations Sales Offices................................................................................................. 20

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

www.power.com/igbt-driver Page 4

Driver Overview

The 2SC0435T is a 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 2SC0435T targets medium-power, dual-channel IGBT and MOSFET applications. The driver supports

switching up to 100kHz at best-in-class efficiency. The 2SC0435T comprises a complete dual-channel IGBT

driver core, fully equipped with an isolated DC/DC converter, short-circuit protection, Advanced Active

Clamping (AAC) and supply-voltage monitoring.

Fig. 2 Block diagram of the driver core 2SC0435T

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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Mechanical Dimensions

Fig. 3 Interactive 3D drawing of 2SC0435T2H0-17

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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Fig. 4 Mechanical drawing of 2SC0435T

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 57.2mm x 51.6mm. The total height of the

driver is max. 20.5mm 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)

X=2.54mm (100mil) for 2SC0435T2H0-17 and 2SC0435T2H0C-17

X=3.1mm (122mil) for 2SC0435T2G1-17 and 2SC0435T2G1C-17

X=5.84mm (230mil) for 2SC0435T2F1-17 and 2SC0435T2F1C-17

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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Pin Designation

Pin No. and Name Function

Primary Side

1 VDC DC/DC converter supply

2 SO1 Status output channel 1; normally high-impedance, pulled down to low on fault

3 SO2 Status output channel 2; normally high-impedance, pulled down to low on fault

4 MOD Mode selection (direct/half-bridge mode)

5 TB Set blocking time

6 VCC Supply voltage; 15V supply for primary side

7 GND Ground

8 INA Signal input A; non-inverting input relative to GND

9 INB Signal input B; non-inverting input relative to GND

10 GND Ground

Secondary Sides

11 ACL1 Active clamping feedback channel 1; leave open if not used

12 VCE1 VCE sense channel 1; connect to IGBT collector through resistor network

13 REF1 Set VCE detection threshold channel 1; resistor to VE1

14 COM1 Secondary side ground channel 1

15 VE1 Emitter channel 1; connect to (auxiliary) emitter of power switch

16 VISO1 DC/DC output channel 1

17 GH1 Gate high channel 1; pulls gate high through turn-on resistor

18 GL1 Gate low channel 1; pulls gate low through turn-off resistor

19 Free

20 Free

21 Free

22 ACL2 Active clamping feedback channel 2; leave open if not used

23 VCE2 VCE sense channel 2; connect to IGBT collector through resistor network

24 REF2 Set VCE detection threshold channel 2; resistor to VE2

25 COM2 Secondary side ground channel 2

26 VE2 Emitter channel 2; connect to (auxiliary) emitter of power switch

27 VISO2 DC/DC output channel 2

28 GH2 Gate high channel 2; pulls gate high through turn-on resistor

29 GL2 Gate low channel 2; pulls gate low through turn-off resistor

Note: Pins with the designation “Free” are not physically present.

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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Recommended Interface Circuitry for the Primary Side Connector

Fig. 5 Recommended user interface of 2SC0435T (primary side)

Both ground pins must be connected together with low parasitic inductance. A common ground plane or wide

tracks are strongly recommended. The connecting distance between ground pins must be kept at a minimum.

Description of Primary Side Interface

General

The primary side interface of the driver 2SC0435T is very simple and easy to use.

The driver primary side is equipped with a 10-pin interface connector with the following terminals:

2 x power-supply terminals

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 to supply the primary side electronics with 15V.

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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VDC terminal

The driver has one VDC terminal on the interface connector to supply the DC-DC converters for the secondary

sides.

VDC should be supplied with 15V. It is recommended to connect the VCC and VDC terminals to a common 15V

power supply. In this case the driver limits the inrush current at startup and no external current limitation of

the voltage source for VDC is needed.

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 72k<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 (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

SCALE™-2+ 2SC0435T

Preliminary Description & Application Manual

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The value of the dead time Tdis determined by the value of the resistor Rmaccording to the following formula

(typical value):

7.52][5.31][  sTkR dm



with 0.6μs<Td<4.1μs and 72kΩ<Rm<181kΩ

Note that the dead time may vary from sample to sample. A tolerance of approximately ±20% may be

expected. If higher timing precisions are required, Power Integrations recommends using the direct mode and

generating the dead time externally (refer to the Application Note AN-1101 /4/).

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 or overcurrent) 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 to be set by connecting a resistor Rbto GND (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.

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