UC1825-SP datasheet(5/18 Pages) TI

No. de pieza	UC1825-SP

Descripción Electrónicos	RAD-TOLERANT CLASS V, HIGH-SPEED PWM CONTROLLER

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Fabricante Electrónico	TI [Texas Instruments]

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UC1825-SP

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SLUS870A – JANUARY 2009 – REVISED MARCH 2012

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for RT = 3.65 kΩ, CT = 1 nF, VCC = 15 V, –55°C < TA < 125°C, TA = TJ

PARAMETERS

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE

Output voltage

TJ = 25°C, IO = 1 mA

5.05

5.10

5.15

V

Line regulation

10 V < VCC < 30 V

2

20

mV

Load regulation

1 mA < IO < 10 mA

5

20

mV

Total output variation

Line, load, temperature

5.0

5.2

V

Output noise voltage

10 Hz < f < 10 kHz

50

μV

Short-circuit current

VREF = 0 V

–15

–50

–100

mA

OSCILLATOR SECTION

Initial accuracy

TJ = 25°C

360

400

440

kHz

Voltage stability

10 V < VCC < 30 V

0.2%

2%

Temperature stability

TMIN < TA < TMAX

5%

16%

Total variation

Line, Temperature

340

460

kHz

Clock out high

3.9

4.5

V

Clock out low

2.3

2.9

V

Ramp peak(1)

2.6

2.8

3.0

V

Ramp valley(1)

0.7

1.0

1.25

V

Ramp valley to peak(1)

1.6

1.8

2.1

V

ERROR AMPLIFIER

Input offset voltage

10

mV

Input bias current

0.6

3

μA

Input offset current

0.1

1

μA

Open-loop gain

1 V < VO < 4 V

60

95

dB

CMRR

1.5 V < VCM < 5.5 V

75

95

dB

PSRR

10 V < VCC < 30 V

85

110

dB

Output sink current

VE/AOut= 1 V

1

2.5

mA

Output source current

VE/AOut = 4 V

–0.5

–1.3

mA

Output high voltage

IE/AOut = –0.5 mA

4.0

4.7

5.0

V

Output low voltage

IE/AOut = 1 mA

0

0.5

1.0

V

Gain bandwidth product(1)

f = 200 kHz

5

10.5

MHz

Slew rate(1)

4

9

V/

μs

PWM COMPARATOR

Ramp bias current

VRamp = 0 V

–1

–5

μA

Duty cycle range

0%

80%

E/A out zero dc threshold

VRamp = 0 V

1.1

1.25

V

Delay to output(1)

50

80

ns

SOFT-START

Charge current

VSoft Start = 0.5 V

3

9

20

μA

Discharge current

VSoft Start = 1 V

1

mA

CURRENT LIMIT/SHUTDOWN

Current limit/shutdown bias current

0 < VILIM/SD < 4 V

15

μA

Current limit threshold

0.9

1.0

1.1

V

Shutdown threshold

1.25

1.40

1.55

V

Delay to output(1)

50

80

ns

(1)

Parameters ensured by design and/or characterization, if not production tested.

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