SIM689XM datasheet(23/55 Pages) SANKEN

23 / 55 page

SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

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

12.2.4 COM1 and COM2

These are the logic ground pins for the built-in control

MICs. The COM1 and COM2 pins should be connected

externally on a PCB because they are not internally

connected. 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 a shunt resistor, RSx, at a single-point ground (or star

ground) which is separated from the power ground (see

Figure 12-5).

COM1

VBB

LS3A

LS2

LS1

COM2

VDC

RS1

RS2

RS3

CDC

OCP

Create a single-point ground

(a star ground) near RSx, but

keep it separated from the

power ground.

Connect the

COM1 and COM2

pins on a PCB.

Figure 12-5.

Connections to Logic Ground

12.2.5

HIN1, HIN2, and HIN3;

LIN1, LIN2, and LIN3

These are the input pins of the internal motor drivers

for each phase. The HINx pin acts as a high-side

controller; the LINx pin acts as a low-side controller.

Figure 12-6 shows an internal circuit diagram of the

HINx or LINx pin. This is a CMOS Schmitt trigger

circuit with a built-in 20 kΩ pull-down resistor, and its

input logic is active high.

Input signals applied across the HINx–COMx and the

LINx–COMx pins in each phase should be set within the

ranges provided in Table 12-1, below. Note that dead

time setting must be done for HINx and LINx signals

because the IC does not have a dead time generator.

The higher PWM carrier frequency rises, the more

switching loss increases. Hence, the PWM carrier

frequency must be set so that operational case

temperatures and junction temperatures have sufficient

margins against the absolute maximum ranges, specified

in Section 1.

If the signals from the microcontroller become

unstable, the IC may result in malfunctions. To avoid

such malfunctions, set the microcontroller output line

not to have high-impedance outputs.. Also, if the traces

from the microcontroller to the HINx or LINx pin (or

both) are too long, the traces may be interfered by noise.

Therefore, it is recommended to add an additional filter

or a pull-down resistor near the HINx or LINx pin as

needed (see Figure 12-7).

Here are filter circuit constants for reference:

–

RIN1x: 33 Ω to 500 Ω

–

RIN2x: 5 kΩ to 10 kΩ

–

CINx: 100 pF to 200 pF

Care should be taken in adding RIN1x and RIN2x to the

traces. When they are connected to each other, the input

voltage of the HINx and LINx pins becomes slightly

lower than the output voltage of the microcontroller.

Table 12-1. Input Signals for HINx and LINx Pins

Parameter

High Level Signal

Low Level Signal

Input

Voltage

3 V < VIN < 5.5 V

0 V < VIN < 0.5 V

Input

Pulse

Width

≥0.5 μs

PWM

Carrier

Frequency

≤20 kHz

Dead

Time

≥1.5 μs

HINx

(LINx)

COM1

(COM2)

5 V

2 kΩ

20 kΩ

2 kΩ

Figure 12-6.

Internal Circuit Diagram of HINx or

LINx Pin

RIN1x

RIN2x

CINx

Input

signal

Controller

HINx/

LINx

SIM689xM

Figure 12-7.

Filter Circuit for HINx or LINx Pin

SIM689XM Datasheet(PDF) 23 Page - Sanken electric

SIM689XM Datasheet(HTML) 23 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