FREQ datasheet(18/56 Pages) FUJITSU

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MB39A214A

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FUJITSU SEMICONDUCTOR CONFIDENTIAL

DS405-00007-1v0-E

(8) Over Voltage Protection (OVP)

This function stops the output voltage when the output voltage has increased, and protects devices

connected to the output.

1. Using OVP Comp, this function makes a comparison between the voltage which is 1.15 times (Typ) of

the internal reference voltage INTREF1 and INTREF2 (0.7 V), and the feedback voltage for the FB1

pin (pin 4) and the FB2 pin (pin 9).

2. If the feedback voltage mentioned in 1 detects the higher state by 15µs (Typ) or more, the operations

below will be performed.

Set the RS latch.

Set the DRVH1 pin (pin 24) and the DRVH2 pin (pin 13) to the “L” level.

Set the DRVL1 pin (pin 22) and the DRVL2 pin (pin 15) to the “H” level.

These operations fix the high-side FET to the off state and the low-side FET to the on state for both

channels of the DC/DC converter, and stops switching (latch stop).The over-voltage protection state can be

cancelled by setting both the EN1pin (pin 2) and EN2 pin (pin 11) to the “L” level or reducing the VCC

power once until the bias voltage (VB) falls below VTHL of UVLO.

VOUT1

FB1

0 V

INTREF

DRVH1

DRVL1

CS1

VOUT2

FB2

DRVH2

DRVL2

CS2

EN1, EN2

UVLO VTHL

15 µs

Output voltage

setting value

Output voltage

setting value

Standby

Less than 15 µs

Cancellation of over-voltage protection

state by EN = "L".

INTREF 1.15

INTREF 1.10

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