UC3525A datasheet(2/8 Pages) FAIRCHILD

2 page

UC3525A

Absolute Maximum Ratings

Electrical Characteristics

(VCC = 20V, TA = -30°C to + 85°C, unless otherwise specified)

Parameter

Symbol

Value

Unit

Supply Voltage

VCC

Collector Supply Voltage

Output Current, Sink or Source

500

Reference Output Current

IREF

Oscillator Charging Current

ICHG(OSC)

5mA

Power Dissipation (TA = 25

°C)

1000

m/W

Operating Temperature

TOPR

0 ~ +70

°C

Storage Temperature

TSTG

-65 ~ +150

°C

Lead Temperature (Soldering, 10 sec)

TLEAD

+300

°C

Parameter

Symbol

Conditions

Min.

Typ. Max.

Unit

REFERENCE SECTION

Reference Output Voltage

VREF

TJ = 25

°C

5.0

5.1

5.2

Line Regulation

∆VREF

VCC = 8 to 35V

Load Regulation

∆VREF

IREF = 0 to 20mA

Short Circuit Output Current

ISC

VREF = 0, TJ = 25

°C

100

Total Output Variation (Note 1)

∆VREF

Line, Load and Temperature

4.95

5.25

Temperature Stability (Note 1)

STT

-20

Long Term Stability (Note 1)

TJ = 125

°C ,1 KHRS

-20

OSCILLATOR SECTION

Initial Accuracy (Note 1, 2)

ACCUR

TJ = 25

°C-

± 3

± 6%

Frequency Change With Voltage

∆f/∆VCC

VCC = 8 to 35V (Note 1, 2)

± 0.8 ± 2%

Maximum Frequency

f(MAX)

RT = 2K

Ω, CT = 470pF

400

430

KHz

Minimum Frequency

f(MIN)

RT = 200K

Ω, CT = 0.1uF

120

Clock Amplitude (Note 1, 2)

V(CLK)

Clock Width (Note 1, 2)

tW(CLK)

TJ = 25

°C0.3

0.6

µs

Sync Threshold

VTH(SYNC)

1.222.8

Sync Input Current

II(SYNC)

Sync = 3.5V

1.3

2.5

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