SIM6800M datasheet(21/52 Pages) SANKEN

21 / 52 page

SIM6800M Series

SIM6800M-DSE Rev.1.5

SANKEN ELECTRIC CO., LTD

Jul. 18, 2018

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

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 COM1 and

COM2 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 k

Ω pull-down resistor, and its

input logic is active high.

Input signals 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

this event, the outputs from the microcontroller output

line should not be high impedance.

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 100 Ω

- RINx: 1 k

Ω to 10 kΩ

- CINx: 100 pF to 1000 pF

Care should be taken when adding RIN1x and RIN2x to

the traces. When they are connected each other, the

input voltage of the HINx and LINx pins becomes

slightly

lower

than

the

output

voltage

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 k

20 k

2 k

Figure 12-6.

Internal Circuit Diagram of HINx or

LINx Pin

RIN1x

RIN2x

CINx

Input

signal

Controller

HINx/

LINx

SIM68xxM

Figure 12-7.

Filter Circuit for HINx or LINx Pin

12.2.6

VBB

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

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

MOSFET drains) 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 2.

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.

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