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2005-06-03 – Rev02

© by SEMIKRON

Under Voltage Protection (UVP) primary

The internally detected supply voltage of the driver has an under voltage protection. The table below gives an

overview of the trip level.

Supply voltage

UVP level

Regulated +15V ±4%

13,5V

If the internally detected supply voltage of the driver falls below this level, the IGBTs will be switched off (IGBT

driving signals set to LOW). The input side switching signals of the driver will be ignored. The error memory will

be set, and the output PRIM_HOLD_OUT changes to the HIGH state.

Under Voltage Protection secondary

This function monitors the rectified voltage on the secondary side. If the voltage drops, the IGBTs will be switched

off (IGBT driving signal set to LOW). The input side switching signals of the driver will be ignored. No failure

message will be generated.

Output voltage

UVP level

Regulated +15V

12V

Input Signals

The signal transfer to each IGBT is made with pulse transformers, used for switching on and switching off of the

IGBT. The inputs have a Schmitt Trigger characteristic and a positive / active high logic (input HIGH = IGBT on;

input LOW = IGBT off).

It is mandatory to use circuits which switch active to +15V and 0V. Pull up and open collector output stages must

not be used for TOP / BOT control signals. It is recommended choosing the line drivers according to the

demanded length of the signal wires.

TOP / BOT Input

A capacitor is connected to the input to obtain high noise

immunity. This capacitor can cause for current limited line

drivers a little delay of few ns, which can be neglected. The

capacitors have to be placed as close as possible to the

driver interface.

Please note:

It is not permitted to apply switching pulses shorter than 1µs.