SIM689XM datasheet(24/55 Pages) SANKEN

24 / 55 page

SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

https://www.sanken-ele.co.jp/en

12.2.6

VBB

This is the input pin for the main supply voltage, i.e.,

the positive DC bus. All of the power MOSFET drains

(IGBT collectors) of the high-side are connected to this

pin. Voltages between the VBB and COMx pins should

be set within the recommended range of the main supply

voltage, VDC, given in Section 0.

To suppress surge voltages, put a 0.01 μF to 0.1 μF

bypass capacitor, CS, near the VBB pin and an

electrolytic capacitor, CDC, with a minimal length of

PCB traces to the VBB pin.

12.2.7

LS1, LS2, LS3A, and LS3B

These are the source (emitter) pins of the low-side

power MOSFETs (IGBTs). For current detection, the

LS1, LS2, and LS3A (LS3B) pins should be externally

connected to shunt resistors, RSx. In actual applications,

use either of the LS3A or LS3B pin because they are

internally connected.

When connecting a shunt resistor, use a resistor with

low inductance, and place it as near as possible to the IC

with a minimum length of traces to the LSx and COMx

pins. Otherwise, malfunction may occur because a

longer circuit trace increases its inductance and thus

increases its susceptibility to improper operations. In

applications where long PCB traces are required, add a

fast recovery diode, DRSx, between the LSx and COMx

pins in order to prevent the IC from malfunctioning.

COM1

VBB

LS3A

LS2

LS1

COM2

VDC

RS1

RS2

RS3

CDC

Put a shunt resistor near the IC with

a minimum length to the LSx pin .

Add a fast recovery

diode to a long trace.

DRS1

DRS2

DRS3

Figure 12-8.

Connections to LSx Pin

12.2.8

OCP

The OCP pin serves as the input for the overcurrent

protections which monitor the currents going through

the

output

transistors.

For

details

the

overcurrent protection (OCP), see Section 12.4.3.

12.2.9

The FO pin operates as the fault signal output. For

more details on this function, see Section 12.4.1. Figure

12-9 illustrates an internal circuit diagram of the FO pin

and its peripheral circuit. Because of its open-collector

nature, the FO pin should be tied by a pull-up resistor,

RFO, to the external power supply. The external power

supply voltage (i.e., the FO Pin Pull-up Voltage, VFO)

should range from 3.0 V to 5.5 V. When the pull-up

resistor, RFO, has a too small resistance, the FO pin

voltage at fault signal output becomes high due to the

saturation voltage drop of a built-in transistor, QFO.

Therefore, it is recommended to use a 3.3 kΩ to 10 kΩ

pull-up resistor. To suppress noise, add a filter capacitor,

CFO, near the IC with minimizing a trace length between

the FO and COMx pins.

For avoiding repeated OCP activation, the external

microcontroller must shut off any input signals to the IC

within an OCP hold time, tP = 5 ms (min.), after the

internal transistor (QFO) turn-on. (For more details, see

Section 12.4.3) Our recommendation is to use a

0.001 μF to 0.01 μF filter capacitor.

5 V

50 Ω

100 kΩ

QFO

VFO

CFO

INT

RFO

COM2

Figure 12-9.

Internal Circuit Diagram of FO Pin and

Its Peripheral Circuit

12.2.10 VT

This pin outputs temperature sensing voltages. The

external microcontroller can monitor the junction

temperature of the internal control stage, not of the

output transistors, with the VT pin. Section 12.3

explains the configuration of the VT pin and its

peripheral circuit and the temperature sensing function.

12.3 Temperature Sensing Function

The

microcontroller

can

monitor

the

junction

temperature of the internal control stage, through

temperature sensing voltages that the VT pin outputs.

The IC must be set to stop its operation as it detects an

abnormal

heating

state

with

temperature

sensing

voltages. A typical example is turning off input signals

from the microcontroller. Figure 12-11 shows a relation

between the VT pin voltage and temperature. Table 12-2

SIM689XM Datasheet(PDF) 24 Page - Sanken electric

SIM689XM Datasheet(HTML) 24 Page - Sanken electric

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

Datasheet Download

Link URL