UC1844A-SP datasheet(7/30 Pages) TI1

部件名	UC1844A-SP

功能描述	QML Class V, Current-Mode PWM Controller

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制造商	TI1 [Texas Instruments]

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UC1842A-SP, UC1843A-SP, UC1844A-SP

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SLUS872D – JANUARY 2009 – REVISED MAY 2015

8.6 Electrical Characteristics (Radiation-Improved Devices)

VCC = 15 V, RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted)

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE

Output voltage

TJ = 25°C, IO = 1 mA

4.94

5

5.06

V

Line regulation

VCC = 12 to 25 V

6

20

mV

Load regulation

IL = 1 to 20 mA

6

25

mV

Total output variation

Over line, load, and temperature

4.9

5.1

V

Output noise voltage

10 Hz

≤ ƒ ≤ 10 kHz, TJ = 25°C

50

μV

Short-circuit output current

–30

–100

–180

mA

OSCILLATOR

Initial accuracy

TJ = 25°C

47

52

57

kHz

Voltage stability

VCC = 12 to 25 V

0.2%

1%

Temperature stability

TJ = –55°C to 125°C

5%

Amplitude

VRT/CT peak to peak

1.7

V

TJ = 25°C, VRT/CT = 2 V

7.8

8.3

8.8

Discharge current(2)

mA

VRT/CT = 2 V

7.5

8.8

ERROR AMPLIFIER

Input voltage

VComp = 2.5 V

2.45

2.50

2.55

V

Input bias current

–0.3

–1

μA

Open-loop voltage gain

VO = 2 to 4 V

65

90

dB

Unity-gain bandwidth

TJ = 25°C

(3)

0.7

1

MHz

PSRR

VCC = 12 to 25 V

60

70

dB

Output sink current

VFB = 2.7 V, VComp = 1.1 V

2

6

mA

Output source current

VFB = 2.3 V, VComp = 5 V

–0.5

–0.8

mA

High-level output voltage

VFB = 2.3 V, RL = 15 kΩ to ground

5

6

V

Low-level output voltage

VFB = 2.7 V, RL = 15 kΩ to VREF

0.7

1.1

V

CURRENT SENSE

Gain(4) (5)

2.85

3

3.15

V/V

Maximum input signal

VComp = 5 V

(4)

0.9

1

1.1

V

PSRR

VCC = 12 to 25 V

(4)

70

dB

Input bias current

–2

–10

μA

Delay to output

VISENSE = 0 to 2 V

(3)

150

300

ns

OUTPUT

ISINK = 20 mA

0.1

0.4

V

Output low-level voltage

ISINK = 200 mA

1.5

2.2

V

ISOURCE = 20 mA

13

13.5

V

Output high-level voltage

ISOURCE = 200 mA

12

13.0

V

Rise time

CL = 1 nF, TJ = 25°C

(3)

50

150

ns

Fall time

CL = 1 nF, TJ = 25°C

(3)

50

150

ns

UVLO saturation

VCC = 5 V, ISINK = 10 mA

0.7

1.2

V

UNDERVOLTAGE LOCKOUT

Start threshold

7.8

8.4

9

V

Minimum operation voltage after turn-on

7

7.6

8.2

V

(1)

Electrical table applicable to radiation-improved 5962-8670409 device type

(2)

This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 μA of current to the measurement. The total

current flowing into the RT or CT pin will be approximately 300 μA higher than the measured value.

(3)

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

(4)

Parameter measured at trip point of latch with VFB = 0 V.

(5)

Gain defined as: G =

ΔVComp/ΔVISENSE; VISENSE = 0 to 0.8 V.

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Product Folder Links: UC1842A-SP UC1843A-SP UC1844A-SP

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