MB3886 데이터 시트보기 (PDF) - Fujitsu

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MB3886

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3886

s SETTING THE OVERVOLTAGE DETECTION VOLTAGE

An overvoltage output from the DC/DC converter can be detected by connecting external resistors from the DC/

DC converter output voltage to the +INC1 terminal (pin 10) and +INC2 terminal (pin 21) of the overvoltage

comparators (OVP Comp. 1 and 2) .

When the DC/DC converter output voltage rises and the detection voltage exceeds the setting voltage, the output

of the overvoltage comparator (OVP Comp. 1, 2) becomes the “H” level and the latch is set to fix only the main

output of the relevant channel at the “L” level and the synchronous-rectification output at the “H” level. At the

same time, the overvoltage protection circuit fixes the PSIG1 terminal (pin 1) at the “L” level when the overvoltage

is detected on CH1 or the PSIG2 terminal (pin 30) at the “L” level when it is detected on CH2. Note that the

overvoltage protection circuit works for each channel separately.

Overvoltage detection voltage : VOVP

VOVP (V) =: 1.47 × (R3 (Ω) + R4 (Ω) ) / R4 (Ω)

To reset the actuated protection circuit, either set the CTL1 terminal (pin 2) or CTL2 terminal (pin 29) to the “L”

level, or decrease the VCC voltage to the reset voltage (1.7 V Min) or less.

VO

R3

(+INC2) 21

10

+INC1

R4

CTL1 (CTL2)

OVP

+ Comp.

−

R

Q

S

1.47 V

20

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