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2SMLT0220D2I0C

Rev. A 04/25

Functional Description of 2SMLT0220D2I0C

steady-state the positive supply voltage V

VISO.

The off-state gate-source voltage V

GS(OFF) equals in steady-state the

voltage V

COM. This voltage is load dependent. It has its lowest value

under no load conditions and is increasing slightly (i.e. getting less

negative) with increasing load.

In the event of an under voltage lock-out condition the gate driver

changes the control of the positive rail towards control of the negative

rail V

COM to avoid any unpredictable system behavior.

Short-Circuit Protection

The SCALE-iFlex LT with NTC gate uses the semiconductor desaturation

effect to detect short-circuits.

The desaturation is monitored on each MAG by using a resistor sensing

network. The drain-source voltage is checked after the response time

t

RES at turn-on to detect a short-circuit. If the voltage is higher than the

programmed threshold voltage V

DS(SAT), the driver detects a short-

circuit condition. The monitored power semiconductor is switched off

after a delay of t

PD(SOx) and a fault signal is transmitted to the IMC.

Paralleled MAGs detect desaturation conditions with minimum time

delays and turn off the corresponding power semiconductor.

It should be noted that the response time t

RES is dependent on the DC-

link voltage. It remains constant between about 50% to 100% of the

maximum DC-link voltage and increases at lower DC-link voltage.

Please refer to the relevant data sheet section.

Note: The desaturation function is for short-circuit detection only and

cannot provide over-current protection. However, over-current

detection has a lower time priority and can be easily provided by the

application.

Gate Clamping

In the event of a short-circuit condition, the gate voltage is increased

due to the high dv

DS/dt between the drain and source terminals of the

driven power semiconductor. This dv

DS/dt drives a current through the

Miller-capacitance (capacitance between the gate and drain) and

charges the gate capacitance, which eventually leads to a gate-source

voltage larger than the nominal gate-source turn-on voltage. In

consequence, the short-circuit current is increased due to the

transconductance of the power semiconductor.

IN2

IN1

SO2

SO1

IMC

Primary-

Side

Controller

Pre-Driver

Channel 1

Pre-Driver

Channel 2

Driver

Channel 1

Driver

Channel 2

MAG #1

Driver

Channel 1

Driver

Channel 2

MAG #2

Cable Channel 2

Cable Channel 1

Cables Channel 2

Cables Channel 1

Driver

Channel 1

Driver

Channel 2

MAG #3

Driver

Channel 1

Driver

Channel 2

MAG #4

Sec. Power

Supply

PIHPAE_0322

TPM

DC/DC

VCC

GND

V15

15V

Figure 3. Functional Block Diagram of 2SILT1200T2A0C with 4 2SMLT0220D2I0C MAGs.

The 2SMLT0220D2I0C (MAGs) are dual channel plug-and-play gate

drivers for iXPLV power modules. The MAGs are fully mechanically and

electrically adapted to the IGBT modules. They work in conjunction

with the IMC to drive up to 4 parallel connected power modules (one

MAG per power module is necessary).

Cable Terminals (X1, X2, X3, X4)

All MAGs have two connector terminals per channel.

The first MAG needs to be connected to the secondary-side of the IMC.

Channel 1 from the IMC needs to be connected to channel 1 of the

MAG (X1 or X2). Accordingly, channel 2 of the IMC with channel 2 of the

MAG (X3 or X4).

In case more than one MAG is used, the first MAG needs to be

connected with the second MAG. Accordingly, the second MAG with the

third MAG and so on. Note that X1 and X2 respectively X3 and X4 are

fully identical and can be exchanged. However, connections to channel

1 and channel 2 shall not be mixed.

Screw Terminals

The MAG is mounted on top of the power module. It must be screwed

to the power semiconductor module. For details please refer to the

‘mounting instruction’ section in this document.

Cables

SCALE-iFlex LT with NTC gate drivers require a set of cables to establish

the electrical connection between the IMC and the first MAG as well as

between paralleled MAGs. The usage of cables allows for flexible

positioning of the IMC within the application. Furthermore, it allows

adapting to various pitches between paralleled power modules. Cables

recommendations are given in the data sheet of the IMC.

Power Supplies

The isolated voltages for the gate driver channels of the MAG is

generated by the integrated DC/DC converter of the IMC. The positive

rail of the gate driver channels has the voltage level V

VISO and the

negative rail has the voltage level V

COM. Both are referenced to the

source potential at terminal S1 or S2 of the driven power semiconductor.

Gate Voltage

SCALE-iFlex LT with NTC possesses a voltage regulator for the positive

(turn-on) rail of the gate voltage. Internal current sources are regulating

actively the positive gate-source voltage V

GS(ON) independently of actual

load conditions within the maximum specified ratings. Therefore, the

on-state gate-emitter voltage of the power semiconductor equals in