UC2844 datasheet(3/3 Pages) TI

部件名	UC2844

功能描述	Current Mode PWM Controller

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制造商	TI [Texas Instruments]

网页	http://www.ti.com

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3

PARAMETER

TEST CONDITIONS

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Reference Section

Output Voltage

TJ = 25°C, IO = 1mA

4.95

5.00

5.05

4.90

5.00

5.10

V

Line Regulation

12

≤ VIN ≤ 25V

6

20

6

20

mV

Load Regulation

1

≤ I0 ≤ 20mA

6

25

6

25

mV

Temp. Stability

(Note 2) (Note 7)

0.2

0.4

0.2

0.4

mV/°C

Total Output Variation

Line, Load, Temp. (Note 2)

4.9

5.1

4.82

5.18

V

Output Noise Voltage

10Hz

≤ f ≤ 10kHz, TJ = 25°C (Note2)

50

µV

Long Term Stability

TA = 125°C, 1000Hrs. (Note 2)

5

25

5

25

mV

Output Short Circuit

-30

-100

-180

-30

-100

-180

mA

Oscillator Section

Initial Accuracy

TJ = 25°C (Note 6)

47

52

57

47

52

57

kHz

Voltage Stability

12

≤ VCC ≤ 25V

0.2

1

0.2

1

%

Temp. Stability

TMIN

≤ TA ≤ TMAX (Note 2)

5

%

Amplitude

VPIN 4 peak to peak (Note 2)

1.7

V

Error Amp Section

Input Voltage

VPIN 1 = 2.5V

2.45

2.50

2.55

2.42

2.50

2.58

V

Input Bias Current

-0.3

-1

-0.3

-2

µA

AVOL

2

≤ VO ≤ 4V

65

90

65

90

dB

Unity Gain Bandwidth

(Note 2) TJ = 25°C

0.7

1

0.7

1

MHz

PSRR

12

≤ VCC ≤ 25V

60

70

60

70

dB

Output Sink Current

VPIN 2 = 2.7V, VPIN 1 = 1.1V

2

6

2

6

mA

Output Source Current

VPIN 2 = 2.3V, VPIN 1 = 5V

-0.5

-0.8

-0.5

-0.8

mA

VOUT High

VPIN 2 = 2.3V, RL = 15k to ground

5

6

5

6

V

VOUT Low

VPIN 2 = 2.7V, RL = 15k to Pin 8

0.7

1.1

0.7

1.1

V

Current Sense Section

Gain

(Notes 3 and 4)

2.85

3

3.15

2.85

3

3.15

V/V

Maximum Input Signal

VPIN 1 = 5V (Note 3)

0.9

1

1.1

0.9

1

1.1

V

PSRR

12

≤ VCC ≤ 25V (Note 3) (Note 2)

70

dB

Input Bias Current

-2

-10

-2

-10

µA

Delay to Output

VPIN 3 = 0 to 2V (Note 2)

150

300

150

300

ns

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

ELECTRICAL CHARACTERISTICS:

Unless otherwise stated, these specifications apply for -55°C

≤ TA ≤ 125°C for the

UC184X; -40°C

≤ TA ≤ 85°C for the UC284X; 0°C ≤ TA ≤ 70°C for the 384X; VCC = 15V

(Note 5); RT = 10k; CT = 3.3nF, TA=TJ.

Note 2:

These parameters, although guaranteed, are not 100% tested in production.

Note 3:

Parameter measured at trip point of latch with VPIN 2 =0.

Note 4:

Gain defined as

A

VPIN

V

=≤

≤

∆

1

3

03 0 8

,.

Note 5:

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

Note 6:

Output frequency equals oscillator frequency for the UC1842 and UC1843.

Output frequency is one half oscillator frequency for the UC1844 and UC1845.

Note 7:

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

Temp Stability V

max

VREF min

TJ max

TJ min

REF

=

−

()

(

)

()

(

)

VREF (max) and VREF (min) are the maximum and minimum reference voltages measured over the appropriate

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

类似零件编号 - UC2844

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