PQ30VB11 datasheet(4/4 Pages) SHARP

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PQ30VB11

Low Power-Loss Voltage Regulators

s Overheat Shut-down Characteristics

s ON/OFF Operation

OFF

VIN

*Tsd

* Tsd:Overheat shut-down temperature (Tj>=110˚C)

1 Overheat shut-down operates at Tj=Tsd and output OFF-state is maintained.

2 OFF-state is kept until VIN is once turned off.

High : Output OFF

Low : Output ON

VADJ

CIN

VIN

Equivalent Circuit

in OFF-state

VO’

VADJ

¡ON/OFF operation is available by mounting externally D2 and R3.

¡When VADJ is forcibly raised above Vref (1.25V TYP) by applying the external signal, the output is turned off(pass transistor of

regulator is turned off). When the output is OFF, VADJ must be higher then Vref MAX., and at the same time must be lower than

maximum rating 7V.

In OFF-state, the load current flows to RL from VADJ through R2. Therefore the value of R2 must be as high as possible.

¡VO'=VADJXRL/ (RL+R2)

occurs at the load. OFF-state equivalent circuit R1 up to 10k

Ω is allowed. Select as high value of RL and R2 as possible in this range.

In some case, as output voltage is getting lower (VO<1V), impedance of load resistance rises. In such condition, it is sometime

impossible to obtain the minimum value of VO'.So add the dummy resistance indicated by RD in the figure to the circuit parallel to the

load.

PQ30VB11 Datasheet(PDF) 4 Page - Sharp Corporation