UC1842A-SP datasheet(3/15 Pages) TI1

tên linh kiện	UC1842A-SP

Giải thích chi tiết về linh kiện	QML CLASS V, CURRENT-MODE PWM CONTROLLERS

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ABSOLUTE MAXIMUM RATINGS

(1) (2)

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

UC1842A-SP, UC1843A-SP, UC1844A-SP, UC1845A-SP

www.ti.com........................................................................................................................................................ SLUS872A – JANUARY 2009 – REVISED MAY 2009

over operating free-air temperature range (unless otherwise noted)

VCC

Supply voltage, low-impedance source

30 V

Supply current

Self limiting

IO

Output current

±1 A

Output energy (capacitive load)

5

µJ

VI

Input voltage (VFB, ISENSE)

–0.3 V to 6.3 V

Error amplifier output sink current

10 mA

PD

Power dissipation (TA = 25°C)

1 W

Tstg

Storage temperature range

–65°C to 150°C

Tlead

Lead temperature (soldering, 10 seconds)

300°C

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal.

over operating free-air temperature range (TA = TJ = –55°C to 125°C), unless otherwise noted.

MIN

MAX

UNIT

VCC

Supply voltage

12

25

V

Sink/source output current (continuous or time average)

0

200

mA

Reference load current

0

20

mA

VCC = 15 V

(1), R

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Reference Section

Output voltage

TJ = 25°C, IO = 1 mA

4.95

5

5.06

V

Line regulation

VIN = 12 V to 25 V

6

20

mV

Load regulation

IO = 1 mA to 20 mA

6

25

mV

Temperature stability(2)(3)

0.2

0.4

mV/°C

Total output variation

Over line, load, and temperature

4.9

5.1

V

Output noise voltage

10 Hz

≤ f ≤ 10 kHz, TJ = 25°C

50

µV

Long term stability

1000 hours, TA = 125°C

(2)

5

25

mV

Short-circuit output current

–30

–100

–180

mA

Oscillator Section

Initial accuracy

TJ = 25°C

(4)

47

52

57

kHz

Voltage stability

VCC = 12 V to 25 V

0.2

1

%

Temperature stability

TA = MIN to MAX

(2)

5

%

Amplitude peak-to-peak

V pin 4(2)

1.7

V

TJ = 25°C

7.8

8.3

8.8

Discharge current

V pin 4 = 2 V(5)

mA

TJ = Full range

7.5

8.8

(1)

Adjust VCC above the start threshold before setting at 15 V.

(2)

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

(3)

Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:

Temp Stability = VREF (max) - VREF (min)/TJ (max) - TJ (min). VREF (max) and VREF (min) are the maximum and minimum reference

voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in

temperature.

(4)

Output frequency equals ocscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator frequency for

UC18444A and UC1845A.

(5)

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/CT pin will be approximately 300 µA higher than the measured value.

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Product Folder Link(s): UC1842A-SP UC1843A-SP UC1844A-SP UC1845A-SP

Số phần tương tự - UC1842A-SP

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	UC1842A-SP	964Kb / 30P	[Old version datasheet] QML Class V, Current-Mode PWM Controller
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	UC1842A-SP	998Kb / 31P	[Old version datasheet] QML Class V, Current-Mode PWM Controller
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