STK541UC60C-E

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10

Usage Precaution

1. This IPM includes bootstrap diode and resistors. Therefore, by adding a capacitor “CB”, a high side drive voltage is generated; each

phase requires an individual bootstrap capacitor. The recommended value of CB is in the range of 1 to 47μF, however this value

needs to be verified prior to production. If selecting the capacitance more than 47μF (±20%), connect a resistor (about 20Ω) in series

between each 3-phase upper side power supply terminals (VB1, 2, 3) and each bootstrap capacitor.

When not using the bootstrap circuit, each upper side pre-drive power supply requires an external independent power supply.

2. It is essential that wiring length between terminals in the snubber circuit be kept as short as possible to reduce the effect of surge

voltages. Recommended value of “CS” is in the range of 0.1 to 10μF.

2.

“ISO” (pin 21) is terminal for current monitor. High current may flow into that course when short-circuiting the “ISO” terminal and

“VSS” terminal. Please do not connect them.

3.

“FAULT” (pin 20) is open DRAIN output terminal (Active Low). Pull up resistor is recommended more than 6.8kΩ.

4. Pull up resistor of 100kΩ is provided internally at the signal input terminals.

5. The over-current protection feature is not intended to protect in exceptional fault condition. An external fuse is recommended for

safety.

7. When input pulse width is less than 1.0μs, an output may not react to the pulse (Both ON signal and OFF signal).

This data shows the example of the application circuit, does not guarantee a design as the mass production set.

The characteristic of PWM switching frequency

Fig. 10 Maximum sinusoidal phase current as function of switching frequency

at Tc = 100

C, VCC = 400V

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101214

161820

PWM Switching Frequency (kHz)