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AN4003

PC POWER SUPPLY DESIGN WITH KA3511

Fairchild Semiconductor 

5. ELECTRICAL CHARACTERISTICS (VCC =20V, TA =25°C)

Value

Characteristic

Symbol

Test Condition Min. Typ. Max. Unit

REFERENCE SECTION

Reference output voltage

Vref

Iref=1mA

4.9 5 5.1 V

Line regulation

Load regulation

Temperature coefficient of Vref(1)

∆Vref.LINE

∆Vref.LOAD

∆Vref/∆T

14V<VCC<30V

1mA<Iref<10mA

-25°C<Ta<85°C

– 2.0 25 mV

– 1.0 15 mV

– 0.01 – %/°C

Short-circuit output current

OSCILLATOR SECTION

ISC

Vref=0

15 35 75 mA

Oscillation frequency

Frequency change with

temperature(1)

fosc

fosc/T

CT=0.01µF, RT=12k

CT=0.01µF, RT=12k

– 10 – kHz

– 2 –%

DEAD TIME CONTROL SECTION

Input bias current

Maximum duty voltage

Input threshold voltage

IB(DT)

DCMAX

VTH(DT)

Pin19 (DTC)=0V

Zero Duty Cycle

Max. Duty Cycle

– -2.0 -10 µA

45 48 50 %

– 3.0 3.3 V

0––

ERROR AMP SECTION

Inverting reference voltage

Vref(EA)

1.20 1.25 1.30 %

Input bias current

Open-loop voltage gain(1)

Unit-gain bandwidth(1)

IB(EA)

GVO

BW

VCOMP=2.5V

0.5V<VCOMP<3.5V

– -0.1 -1.0 µA

70 95 – dB

– 650 – kHz

Output sink current

Output source current

PWM COMPARATOR SECTION

ISINK

ISOURCE

VCOMP=0.7V

VCOMP=3.5V

0.3 0.9 – mA

-2.0 -4.0 – mA

Input threshold voltage

OUTPUT SECTION

VTH(PWM) Zero Duty Cycle

– 4 4.5 V

Output saturation voltage

Collector off-state current

Rising time

Falling time

PROTECTION SECTION

VCE(SAT) IC=200mA

– 1.1 1.3 V

IC(off)

VCC=VC=30V, VE=0V –

2 100 µA

TR

– 100 200 ns

TF

– 50 200 ns

Over voltage protection for 3.3V VOVP1

3.8 4.1 4.3 V

Rev C, November 1999

6

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