SIM689XM datasheet(25/55 Pages) SANKEN

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SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

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

and Table 12-3 provide the details of variations found in

Figure 12-11.

Temperature sensing voltages may exceed 3.0 V,

causing permanent damage to the IC in the worst case.

To protect the parts connected to the VT pin such as the

microcontroller, add a clamp diode, DVT, between the

microcontroller power supply and the VT pin (see

Figure 12-10).

Controller power supply

COM2

DVT

CVT

Controller

RVT

Figure 12-10.

VT Pin Peripheral Circuit

Figure 12-11.

VT Pin Voltage vs. Internal Control

Stage Junction Temperature, TJ(MIC) (Design Value)

Table 12-2. TJ(MIC) Variation on VT Pin Voltage (Design

Value)

VT Pin Voltage

(V)

TJ(MIC)

(°C)

1.30

50 ± 4

3.15

125 ± 3

Table 12-3. VT Pin Voltage Variation on TJ(MIC) (Design

Value)

TJ(MIC)

(°C)

VT Pin Voltage

(V)

1.30 ± 0.10

125

3.15 ± 0.07

12.4 Protection Functions

This section describes the various protection circuits

provided in the SIM689xM series. The protection

circuits include the undervoltage lockout for power

supplies (UVLO), the overcurrent protection (OCP), and

the thermal shutdown (TSD). 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.

“VBx–HSx” refers to the voltages between the VBx pin

and output pins (U, V, and W1).

12.4.1

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) Thermal shutdown (TSD)

While the FO pin is in the low state, all the low-side

transistors turn off. In normal operation, the FO pin

outputs a high signal of about 5 V. Motor operations

must be controlled by the external microcontroller so

that it can immediately stop the motor when fault signals

are detected. To prevent the IC from having permanent

damage at OCP activation, be sure to set the motor

operation to stop within tP = 10.0 ms (typ.). tP is the fault

signal output time of the FO pin, fixed by a built-in

feature of the IC itself (see Section 12.4.3). To resume

the motor operation thereafter, set the motor to be

resumed after a lapse of ≥2 seconds.

12.4.2

Undervoltage Lockout for Power

Supply (UVLO)

In case the gate-driving voltages of the output

transistors decrease, their steady-state power dissipations

increase.

This

overheating

condition

may

cause

permanent damage to the IC in the worst case. To

prevent this event, the SIM689xM series has the

undervoltage lockout (UVLO) circuits for both of the

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

100

125

150

Junction Temperature, T

J(MIC) (°C)

Min.

Typ.

Max.

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