SIM689XM datasheet(26/55 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

high- and low-side power supplies.

12.4.2.1. Undervoltage Lockout for High-

side Power Supply (UVLO_VB)

Figure 12-12 shows operational waveforms of the

undervoltage lockout for high-side power supply (i.e.,

UVLO_VB).

When the voltage between the VBx and output pins

(VBx–HSx) decreases to the High-side Logic Operation

Stop Voltage (VBS(OFF) = 10.0 V) or less, the UVLO_VB

circuit in the corresponding phase gets activated and sets

an HOx signal to logic low. When the voltage between

the VBx and HSx pins increases to the High-side Logic

Operation Start Voltage (VBS(ON) = 10.5 V) or more, the

IC releases the UVLO_VB operation. Then, the HOx

signal becomes logic high at the rising edge of the first

input command after the UVLO_VB release. Any fault

signals are not output from the FO pin during the

UVLO_VB operation. In addition, the VBx pin has an

internal UVLO_VB filter of about 3 μs, in order to

prevent noise-induced malfunctions.

LINx

HINx

VBx-HSx

HOx

LOx

VBS(OFF)

VBS(ON)

No FO output at UVLO_VB.

UVLO release

UVLO_VB

operation

About 3 µs

HOx restarts at

positive edge after

UVLO_VB release.

Figure 12-12.

UVLO_VB Operational Waveforms

12.4.2.2. Undervoltage Lockout for Low-

side Power Supply (UVLO_VCC)

Figure 12-13 shows operational waveforms of the

undervoltage lockout for low-side power supply (i.e.,

UVLO_VCC). When the VCC2 pin voltage decreases to

the

Low-side

Logic

Operation

Stop

Voltage

(VCC(OFF) = 11.0 V) or less, the UVLO_VCC circuit in

the corresponding phase gets activated and sets both of

HOx and LOx signals to logic low. When the VCC2 pin

voltage increases to the Low-side Logic Operation Start

Voltage (VCC(ON) = 11.5 V) or more, the IC releases the

UVLO_VCC

operation.

The

then

resumes

transmitting HOx and LOx signals according to input

commands on the HINx and LINx pins, respectively.

During the UVLO_VCC operation, the FO pin becomes

logic low and sends fault signals.

addition,

the

VCC2

has

internal

UVLO_VCC filter of about 3 μs, in order to prevent

noise-induced malfunctions.

About 3 µs

LINx

HINx

VCC2

HOx

LOx

VCC(OFF)

VCC(ON)

LOx responds to input signal.

UVLO_VCC

operation

Figure 12-13.

UVLO_VCC Operational Waveforms

12.4.3

Overcurrent Protection (OCP)

The overcurrent protection (OCP) is a protection

against large inrush currents (i.e., high di/dt). Figure 12-

14 is an internal circuit diagram describing the OCP pin

and its peripheral circuit. The OCP pin detects

overcurrents with voltage across external shunt resistors,

RSx. Because the OCP pin is internally pulled down, the

OCP pin voltage increases proportionally to a rise in the

current running through the shunt resistor, RSx.

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