HA16129AFPJ datasheet(7/23 Pages) RENESAS

7 / 23 page

HA16129AFPJ

Rev.1.00 Jun 15, 2005 page 7 of 22

Calculation Formulas

Item

Formula

Notes

Reference

voltage

Vout = 1.225 1 +

R1, R2; k

Ω

37 // R1

12 // R2

(

While the Vout voltage will be 5 V

±1.5% when the Voadj pin

is open, the circuit shown here should be used to change the

Vout voltage externally.

Voadj

VCC

Vout

Short

detection

voltage

CS (700 mV Typ)

< I

⋅ R

When this function operates, the base current to the external

transistor connected to the CS pin stops and the Vout output

is lowered.

VCC

Vout

RCS

OVP

–

This function prevents the microprocessor from being

damaged if the Vout voltage is inadvertently increased to too

high a level. The OVP detection voltage is fixed.

tRH, tRL

= 3.3

× C

⋅ R

= 1.1

× C

⋅ R

These determine the reset pulse frequency and duty.

RES

tRH

tRL

tON

ON = 1.1

× C

⋅ R

Sets the time from the rise of the

NMI signal to the point the

RES output is cleared.

NMI

tON

RES

tOFF

OFF = 6.5

× C

⋅ R

Sets the time from the point the P-RUN pulse stops to the

point a reset pulse is output.

RES

toff

P-RUN

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