CYStech Electronics Corp.

Spec. No. : C503Q8

Issued Date : 2003.03.21

Revised Date :

Page No. : 3/5

PL2951Q8

CYStek Product Specification

Note 1:Output or reference voltage temperature coefficients defined as the worse case voltage change divided by the

total temperature range.

Feedback pin tied to

Note 3.Regulations is measured at constant junction temperature, using pulse testing with a low duty cycle.

Changes in output voltage due to heating effects are covered under the specification for thermal regulation.

by design to 0.2%.

Note 5:Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below

its nominal value measured at 1V differential. At very low values of programmed output voltage, the mini-

mum input supply voltage of 2V(2.3V over temperature) must be taken into account.

Note 7:Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by

the total temperature range.

Note 8:Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the

nominal reference voltage measured at Vo+1V input. To express these thresholds in terms of output voltage

change, multiply by the error amplifier gain = Vout/Vin=(R1+R2)/R2. For example, at a programmed output

voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV×5V/1.235=384mV.

Thresholds remain constant as a percent of Vout as Vout is varied, with the dropout warning occurring at

typically 5% below nominal, 7.5% guaranteed.

Note 9:Vshutdown≥2V, Vin≤30V, Vout=0, feedback pin tied to –XX V tap.

Block Diagram and Typical Applications

CAP

60mV

FEEDBACK

INPUT

OUTPUT

SENSE

XX V TAP

ERROR

GROUND

SHUTDOWN

TO CMOS

OR TTL

Vo=XX V

100mA Max

1.23V

REF

ERROR AMPLIFIER

4

5

6

2

1

8

7

3