SCM2000MKF datasheet(21/44 Pages) SANKEN

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SCM2000MKF Series

SCM2000MKF-DSE Rev.1.0

SANKEN ELECTRIC CO., LTD

Nov. 12, 2018

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

12.2.9. SELECT

The SCM2000MKF series is designed to select an

OCP hold time, tP, from 34

μm or 8 ms, based on the

SELECT pin connection. (For more details on the OCP,

see Section 12.3.4.)

When connecting the SELECT pin to the ground

(COM) as in Figure 9-1, select an OCP hold time of 8

ms. When pulling up the SELECT pin to the external

power supply (3.0 V to 5.5 V) as in Figure 9-2, select an

OCP hold time of 34 µs. A pull-up resistor, RSEL, and a

noise filter capacitor, CSEL, should be maintained within

the recommended range given in Section 2.

12.2.10. SD

The SD pin serves as the input for the overvoltage

protection which monitors voltages across the VBB and

LSx pins. Section 12.3.5 provides details on the SD pin

peripheral circuit and the OVP operation.

12.2.11. FO

This pin operates as the fault signal output and the

shutdown signal input. Sections 12.3.1 and 12.3.2

explain the two functions in detail, respectively.

Figure 12-7 illustrates an internal circuit diagram of

the FO pin and its peripheral circuit. Because of its

open-drain nature, the FO pin should be tied by a pull-up

resistor, RFO, to the external power supply. The external

power supply voltage (i.e., the FO Pin Pull-up Voltage,

VFO) should range from 3.0 V to 5.5 V. Figure 12-9

shows a relation between the FO pin voltage and the

pull-up resistor, RFO. When the pull-up resistor, RFO, has

a too small resistance, the FO pin voltage at fault signal

output becomes high due to the on-resistance of a built-

in MOSFET, QFO (Figure 12-7). Therefore, it is

recommended to use a 1 kΩ to 22 kΩ pull-up resistor

when the Low Level Input Threshold Voltage of the

microcontroller, VIL, is set to 1.0 V. To suppress noise,

add a filter capacitor, CFO, near the IC with minimizing a

trace length between the FO and COMx pins.

Note that, however, this additional filtering allows a

delay time, tD(FO), to occur, as seen in Figure 12-8. The

delay time, tD(FO), is a period of time which starts when

the IC receives a fault flag turning on the internal

MOSFET, QFO, and continues until when the FO pin

reaches its threshold voltage (VIL) of 1.0 V or below (put

simply, until the time when the IC detects a low state,

“L”). Figure 12-10 shows how the delay time, tD(FO), and

the noise filter capacitor, CFO, are related.

When VIL is set to 1.0 V, it is recommended to use a

0.001 μF to 0.01 μF noise filter capacitor, C

FO, allowing

sufficient

margin

deal

with

variations

characteristics.

avoid

the

repetition

OCP

activations, the external microcontroller must shut off

any input signals to the IC within an OCP hold time, tP,

which occurs after the internal MOSFET (QFO) turn-on.

μs where the thermal characteristics

(SELECT = logic high) are taken into account. (For

more details, see Section 12.3.4.) To resume motor

operations thereafter, set the motor to be resumed after a

lapse of ≥2 seconds.

5 V

2 k

100 k

Blanking

filter

Output SW turn-off

QFO

3.0 µs (typ.)

VFO

CFO

INT

RFO

COM2

Figure 12-7.

Internal Circuit Diagram of FO Pin and

Its Peripheral Circuit

FO Pin

Voltage

QFO

VIL

tD(FO)

Figure 12-8.

FO Pin Delay Time, tD(FO)

Figure 12-9.

Fault Signal Voltage vs.

Pull-up Resistor, RFO

Figure 12-10.

Delay Time, tD(FO) vs. Filter Capacitor,

CFO

0.1

0.2

0.3

0.4

0.5

FO (kΩ)

j = 25 °C

Max.

Typ.

Min.

0.000

0.005

0.010

0.015

0.020

0.025

FO (µF)

j = 25 °C

Max.

Typ.

Min.

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