SENSITRON

SEMICONDUCTOR

TECHNICAL DATA

DATASHEET 4977, Rev. B

©2004 Sensitron Semiconductor

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Deer Park, NY 11729

(631) 586 7600 FAX (631) 242 9798

• www.sensitron.com • sales@sensitron.com • Page 11

SPM6G140-060D

Brk ( Pins 26,27 ), is Brake Terminal. Brake Resistor shall be connected between these terminals and +VDC. If the

brake resistor is inductive, a freewheeling diode shall be connected across this resistor.

Gbrk ( Pin 28 ), is Brake IGBT Gate Input. Brake IGBT Emitter is internally connected to DC Bus return.

+VDC Rtn ( Pins 29 to 32 ), is DC Bus return.

+VDC (Pins 33 to 36 ), is +DC Bus input.

PhC (Pins 37 to 39 ), is Phase C output.

PhB (Pins 40 to 42 ), is Phase B output.

PhA (Pins 43 to 45 ), is Phase A output.

A- DC Bus Charging from 15V

•

Each IGBT is protected against desaturation.

•

D2 is the desaturation sense diode for the high-side IGBT

•

D3 is the desaturation sense diode for the low-side IGBT

•

When the DC bus voltage is not applied or below 15V, there is a charging path from the 15V supply to

the DC bus through D2 and D3 and the corresponding pull up 100K Ohm resistor. The charging current

is 0.15mA per IGBT. Total charging current is about 1.5mA.

•

Do not apply PWM signal if the DC bus voltage is below 20V.

B- Bias For Desaturation Detection Circuit:

The desaturation detection is done by diode D2 for the high side IGBT Q1H, and by diode D3 for the low side

IGBT Q1L. The internal detection circuit, input DSH for the high-side and input DSL for the low-side, is

biased by the local supply voltage VCC for the low side and VBS for the high side. When the IGBT is on the

corresponding detection diode is on. The current flowing through the diode is determined by the internal pull

resistor, R1 for the high side and R2 for the low side. To minimize the current drain from VCC and VBS, R1

and R2 are set to be 100K

Ω. Lower value of R1 will overload the bootstrap circuit and reduce the bootstrap

capacitor holding time.

DS

•

DS

D1

Gate

Driver

+15V Rtn

Sgnl Gnd1

+VDC

PhA

Vcc

+15V

Q1H

Q1L

D2

D3

R1

100K

Ω

700

K

Ω

R2

100K

Ω

700

K

Ω

+VDC Rtn

Figure 7.

Charging Path from 15V Supply to DC Bus when DC Bus is off

VB