SCM3000C datasheet(17/41 Pages) SANKEN

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SCM3000C Series

SCM3000C-DSE Rev.1.2

SANKEN ELECTRIC CO., LTD.

Aug. 21, 2017

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

12. Functional Descriptions

All the characteristic values given in this section are

typical values, unless they are specified as minimum or

maximum.

For pin descriptions, this section employs a notation

system that denotes a pin name or an electronic symbol

name with the arbitrary letter “x”, depending on context.

The U-, V-, and W-phases are represented as the pin

numbers 1, 2, and 3, respectively. Thus, “the HINx pin”

is used when referring to any or all of the HIN1, HIN2,

and HIN3 pins.

Also, when different pin names are mentioned as a

pair, they are meant to be the pins in the same phase. For

example, “the VBx and output (U, V, or W) pins” can be

any of “VB1–U”, “VB2–V”, or “VB3–W”.

12.1. Turning On and Off the IC

The procedures listed below provide recommended

startup and shutdown sequences. To turn on the IC

properly, do not apply any voltage on the VBB, HINx,

and LINx pins until the VCCx pin voltage has reached a

stable state (VCC(ON)

≥ 11.5 V). It is required to charge

bootstrap capacitors, CBOOTx, up to full capacity at

startup (see Section 12.2.3).

To turn off the IC, set the HINx and LINx pins to

logic low (or “L”), and then decrease the VCC pin

voltage.

12.2. Pin Descriptions

12.2.1. VBB

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

the positive DC bus. All of the IGBT collectors of the

high-side are connected to this terminal. Voltages

between the VBB and COM pins should be set within

the recommended range of the main supply voltage, VDC,

given in Section 2.

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

snubber capacitor, CS, near the VBB pin and an

electrolytic capacitor, CDC, with a minimal length of

PCB traces to the VBB pin.

12.2.2. U, V, and W

These pins are the outputs of the three phases, and

serve as the connection terminals to the 3-phase motor.

These are also the grounds of the high-side floating

supplies for each phase, and are connected to the

negative nodes of the bootstrap capacitors, CBOOTx.

12.2.3. VCC

This is the logic supply pin for the built-in pre-driver

IC. To prevent malfunction induced by supply ripples or

other factors, put a 0.01 μF to 0.1 μF ceramic capacitor,

CVCC, near the VCC and COM pins. To prevent damage

caused by surge voltages, put an 18 V to 20 V Zener

diode, DZ, between the VCC and COM pins (as in

Figure 12-1).

Voltage to be applied between the VCC and COM

pins should be regulated within the recommended

operational range of VCC, given in Section 2.

VCC

COM

VCC

MIC

CVCC

Figure 12-1.

VCC Pin and Its Peripheral Circuit

12.2.4. COM

This is the logic ground pin for the built-in pre-driver

IC. Varying electric potential of the logic ground can be

a cause of improper operations. Therefore, connect the

logic ground as close and short as possible to shunt

resistors, RSx, at a single-point ground (or star ground)

which is separated from the power ground (see Figure

12-2).

Moreover, extreme care should be taken when wiring

so that currents from the power ground do not affect the

COM pin.

VBB

LS3

LS2

LS1

COM

VDC

RS1

RS2

RS3

CDC

OCP

Create a single-point

ground (a star ground)

near RSx, but keep it

separated from the

power ground.

Logic ground trace

Figure 12-2.

Connections to Logic Ground

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