SCM2000MKF datasheet(20/44 Pages) SANKEN

20 / 44 page

SCM2000MKF Series

SCM2000MKF-DSE Rev.1.0

SANKEN ELECTRIC CO., LTD

Nov. 12, 2018

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

control ICs. The VCC1 and VCC2 pins must be

externally connected on a PCB because they are not

internally connected. To prevent malfunction induced by

supply ripples or other factors, put a 0.01 μF to 0.1 μF

ceramic capacitor, CVCCx, near these pins. To prevent

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

Zener diode, DZ, between the VCCx and COMx pins.

Voltages to be applied between the VCCx and COMx

pins should be regulated within the recommended

operational range of VCC, given in Section 2.

COM1

VBB

LS3

LS2

LS1

COM2

VDC

CDC

OCP

Create a single-point

ground (a star ground)

near RS, but keep it

separated from the power

ground.

Figure 12-4.

Connections to Logic Ground

12.2.7. 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 12-5 shows an internal circuit diagram of the

HINx or LINx pin. This is a CMOS Schmitt trigger

circuit with a built-

in 22 kΩ pull-down resistor, and its

input logic is active high.

Input signals across the HINx–COM and the LINx–

COM in each phase should be set within the ranges

provided in Table 12-2, 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 12-6).

Here are filter circuit constants for reference:

– R

IN1x: 33

Ω to100 Ω

– R

IN2x: 1

kΩ to10 kΩ

– C

INx: 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 12-2.

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)

COMx

5 V

2 k

22 k

Figure 12-5.

Internal Circuit Diagram of HINx or

LINx Pin

RIN1x

RIN2x

CINx

Input

signal

Controller

HINx

(LINx)

SCM200xMF

Figure 12-6.

Filter Circuit for HINx or LINx Pin

12.2.8. OCP

This pin serves as the input of the overcurrent

protection (OCP) for monitoring the currents going

through the output transistors. Section 12.3.4 provides

further information about the OCP circuit configuration

and its mechanism.

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