SCM3000C datasheet(21/41 Pages) SANKEN

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SCM3000C Series

SCM3000C-DSE Rev.1.2

SANKEN ELECTRIC CO., LTD.

Aug. 21, 2017

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

Figure 12-12.

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

12.2.10.

THM

The

SCM3000C

series

incorporates

built-in

thermistor for case temperature detection. The THM pin

operates as the output of the thermistor voltage which

monitors the case temperature of the IC via the external

microcontroller.

The SCM3000C series does not have any protection

against overtemperature; therefore, the motor must be

externally controlled when a temperature rise occurs, or

be controlled with such protective measures.

Moreover, note that the THM pin output does not

provide the temperature followability, especially when a

rapid temperature rise in the output transistors occurs

during motor lock and short circuit conditions.

When connecting a thermistor, connect one end of it

to the THM pin, then internally connect the other end to

the COM pin. Figure 12-14 depicts a typical thermistor

resistance vs. temperature curve; Figure 12-15 plots a

typical performance curve of the THM pin.

The THM pin should be tied to the external power

supply, along with a pull-up resistor, RTHM, and a noise

filter capacitor, CTHM.

For proper IC operation, you application must be set

as follows: The external power supply voltage, VTHM,

should range from 3.0 V to 5.5 V. Use RTHM with a

resistance of ≥4.4 kΩ, and C

THM with a capacitance of

≥4.7 nF. Then, place C

THM as close as possible to the IC

with minimizing a trace length between the THM and

COM pins.

VTHM

CTHM

RTHM

THM

COM

Figure 12-13.

Internal Circuit Diagram of THM Pin

and Its Peripheral Circuit

Figure 12-14.

Typical Thermistor Resistance vs.

Temperature Curve

Figure 12-15.

THM Pin Typical Performance Curve

12.3. Protection Functions

This section describes the various protection circuits

provided in the SCM3000C series. The protection

circuits include: the Undervoltage Lockout for power

supplies (UVLO), the Simultaneous On-state prevention,

and the Overcurrent Protection (OCP).

In case one or more of these protection circuits are

activated, the FO pin outputs a fault signal; as a result,

the external microcontroller can stop the operations of

the three phases by receiving the fault signal. In the

following functional descriptions, “HOx” denotes a gate

input signal on the high-side transistor, whereas “LOx”

denotes a gate input signal on the low-side transistor

(see also the diagram in Section 7).

12.3.1. Fault Signal Output

In case one or more of the following protections are

actuated, an internal transistor, QFO, turns on, then the

FO pin becomes logic low (≤0.5 V).

1) Low-side Undervoltage Lockout (UVLO_VCC)

2) Overcurrent Protection (OCP)

3) Simultaneous On-state Prevention

During the time when the FO pin holds the logic low

state, the high- and low-side transistors of all phases turn

off. In normal operation, the FO pin holds a logic high

state and outputs a 5 V signal. The fault signal output

time of the FO pin at OCP activation is the OCP hold

time (tP) of 30

μs (typ.), fixed by a built-in feature of the

itself

(see

Section

12.3.3).

The

external

microcontroller receives the fault signals with its

interrupt pin (INT), and must be programmed to put the

HINx

and

LINx

pins

logic

low

within

the

predetermined OCP hold time, tP. If you need to resume

the motor operation, set the motor to be resumed after a

lapse of ≥2 seconds.

100

Case Temperature (

°C)

1.0

1.5

2.0

2.5

3.0

3.5

100

Case Temperature (

°C)

THM = 5 V

THM = 6.8 kΩ

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