CYStech Electronics Corp.
total temperature range.
Spec. No. : C503Q8
Issued Date : 2003.03.21
Revised Date :
Page No. : 3/5
Note 1:Output or reference voltage temperature coefficients defined as the worse case voltage change divided by the
Note 2:Unless otherwise specified all limits guaranteed for T
J
=25℃,Vin=Vo+1V,I
L
=100μA and C
L
=1μF.
Feedback pin tied to
–XX
V tap pin and output tied to output sense (Vout=XX V) and V
shutdown
≤0.8V.
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.
Note 4:Line regulation is tested at 150
℃
for I
L
=1mA. For I
L
=100μA and T
J
=125
℃,
line regulation is guaranteed
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 6:Vref≤Vout≤(Vin-1V),2.3V≤Vin≤30V,100μA≤I
L
≤100mA,T
J
≤T
JMAX
.
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
Vo=XX V
100mA Max
7
FEEDBACK
8
INPUT
1
OUTPUT
SENSE
2
XX V TAP
3
SHUTDOWN
60mV
6
CAP
ERROR AMPLIFIER
TO CMOS
OR TTL
ERROR
5
1.23V
REF
GROUND
4
PL2951Q8
CYStek Product Specification
CYSTEKEC [ CYSTECH ELECTONICS CORP. ]
