1ED020I12-BT Datasheet, PDF (14/34 Pages) Infineon Technologies AG – Single IGBT Driver IC

4
Functional Description
EiceDRIVER™
1ED020I12-BT
Functional DescriptionIntroduction
4.1
Introduction
The 1ED020I12-BT is an advanced IGBT gate driver for motor drives typical greater 10 kW. Control and protection
functions are included to make possible the design of high reliability systems.
The device consists of two galvanic separated parts. The input chip can be directly connected to a standard 5 V
DSP or microcontroller with CMOS in/output and the output chip is connected to the high voltage side.
An effective active Miller clamp function avoids the need of negative gate driving in some applications and allows
the use of a simple bootstrap supply for the high side driver.
A rail-to-rail driver output enables the user to provide easy clamping of the IGBTs gate voltage during short circuit
of the IGBT. So an increase of short circuit current due to the feedback via the Miller capacitance can be avoided.
Further, a rail-to-rail output reduces power dissipation.
The device also includes an IGBT desaturation protection with a /FLT status output.
A two-level turn-off feature with adjustable delay protects against excessive overvoltage at turn-off in case of
overcurrent or short circuit condition. The same delay is applied at turn-on to prevent pulse width distortion.
A READY status output reports if the device is supplied and operates correctly.
+5V
SGND
IN+
RDY
FLT
RST
VCC1
100n
GND1
IN+
IN-
RDY
/FLT
/RST
VCC2
DESAT
CLAMP
OUT
TLSET
GND2
VEE 2
+15V
1µ
1k
10R
10V 47p 220p
1µ
-8V
Figure 4 Application Example Bipolar Supply
4.2
Supply
The driver 1ED020I12-BT is designed to support two different supply configurations, bipolar supply and unipolar
supply.
In bipolar supply the driver is typically supplied with a positive voltage of 15V at VCC2 and a negative voltage of
-8V at VEE2, refer to Figure 4. Negative supply prevents a dynamic turn on due to the additional charge which
is generated from IGBT input capacitance times negative supply voltage. If an appropriate negative supply voltage
is used, connecting CLAMP to IGBT gate is redundant and therefore typically not necessary.
For unipolar supply configuration the driver is typically supplied with a positive voltage of 15V at VCC2. Erratically
dynamic turn on of the IGBT could be prevented with active Miller clamp function, so CLAMP output is directly
connected to IGBT gate, refer to Figure 5.
Final Data Sheet
14
Rev 2.0, 2012-07-31