SIM6892MS datasheet(21/55 Pages) SANKEN

21 / 55 page

SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

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

12. Functional Descriptions

Unless specifically noted, this section uses the

following definitions:

● All the characteristic values given in this section are

typical values.

● All the circuit diagrams listed in this section represent

the type of IC that incorporates power MOSFETs. All

the functional descriptions in this section are also

applicable to the type of IC that incorporates IGBTs.

● For pin and peripheral component descriptions, this

section employs a notation system that denotes a pin

name with the arbitrary letter “x”, depending on

context. Thus, “the VCCx pin” is used when referring

to either or both of the VCC1 and VCC2 pins.

● The COM1 pin is always connected to the COM2 pin.

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) ≥ 12.5 V).

It is required to fully charge bootstrap capacitors, CBx,

at startup (see Section 12.2.2).

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

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

voltage.

12.2 Pin Descriptions

12.2.1

U, V, V1, V2, W1, and W2

The U, V1, V2, W1, and W2 pins are the outputs of

the three phases, and serve as the connection terminals

to the 3-phase motor. The V pin must be connected to a

bootstrap capacitor of the V-phase. Do not connect the

3-phase motor to the V pin. The V1 and W1 pins must

be connected to the V2 and W2 pins on a PCB,

respectively.

The U, V (V1) and W1 pins are the grounds for the

VB1A (VB1B), VB2, and VB3 pins. The U, V, and W1

pins are connected to the negative nodes of bootstrap

capacitors, CBx. The V pin is internally connected to the

V1 pin.

Since high voltages are applied to these output pins

(U, V1, V2, W1, and W2), it is required to take

measures for insulating as follows:

● Keep enough distance between the output pins and

low-voltage traces.

● Coat the output pins with insulating resin.

12.2.2

VB1A, VB1B, VB2, and VB3

These pins are connected to bootstrap capacitors for

the high-side floating supply.

In actual applications, use either of the VB1A or

VB1B pin because they are internally connected.

Voltages across the VBx and these output pins should

be maintained within the recommended range (i.e., the

Logic Supply Voltage, VBS) given in Section 0.

A bootstrap capacitor, CBx, should be connected in

each of the traces between the VB1A (VB1B) and U

pins, the VB2 and V pins, the VB3 and W1 pins.

For proper startup, turn on the low-side transistor first,

then fully charge the bootstrap capacitor, CBx.

For the capacitance of the bootstrap capacitors, CBx,

choose the values that satisfy Equations (1) and (2).

Note

that

capacitance

tolerance

and

bias

characteristics must be taken into account when you

choose appropriate values for CBx.

CBx(μF) > 800 × tL(OFF)

(1)

1 μF ≤ CBx ≤ 220 μF

(2)

In Equation (1), let tL(OFF) be the maximum off-time of

the low-side transistor (i.e., the non-charging time of

CBx), measured in seconds.

Even while the high-side transistor is not on, voltage

across the bootstrap capacitor keeps decreasing due to

power dissipation in the IC. When the VBx pin voltage

decreases to VBS(OFF) or less, the high-side undervoltage

lockout (UVLO_VB) starts operating (see Section

12.4.2.1). Therefore, actual board checking should be

done thoroughly to validate that voltage across the VBx

pin maintains over 11.0 V (VBS > VBS(OFF)) during a low-

frequency operation such as a startup period.

As Figure 12-1 shows, a bootstrap diode, DBx, and a

current-limiting resistor, RBx, are internally placed in

series between the VCC1 and VBx pins.

Time constant for the charging time of CBx, τ, can be

computed by Equation (3):

τ = CBx × RBx ,

(3)

where CBx is the optimized capacitance of the

bootstrap capacitor, and RBx is the resistance of the

current-limiting resistor (60 Ω ± 25%).

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