UC2842A datasheet(2/7 Pages) TI

Nome de Peças	UC2842A

Descrição Electrónicos	Current Mode PWM Controller

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Fabricante Electrônico	TI [Texas Instruments]

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PACKAGE PIN FUNCTION

FUNCTION

N/C

1

Comp

2

N/C

3-4

VFB

5

N/C

6

ISENSE

7

N/C

8-9

RT/CT

10

N/C

11

Pwr Gnd

12

Gnd

13

N/C

14

Output

15

N/C

16

VC

17

VCC

18

N/C

19

VREF

20

DIL-8, SOIC-8 (TOP VIEW)

J or N, D8 Package

CONNECTION DIAGRAMS

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for -55

°C ≤ TA ≤ 125°C for the

UC184xA; -40

°C ≤ TA ≤ 85°C for the UC284xA; 0 ≤ TA ≤ 70°C for the UC384xA; VCC = 15V (Note 5); RT = 10k; CT = 3.3nF; TA = TJ; Pin

numbers refer to DIL-8.

PARAMETER

TEST CONDITIONS

UC184xA\UC284xA

UC384xA

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

≤≤ IO ≤≤ 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.

4.9

5.1

4.82

5.18

V

Output Noise Voltage

10Hz

≤≤ f ≤≤ 10kHz

TJ = 25°C (Note 2)

50

µV

Long Term Stability

TA = 125°C, 1000Hrs. (Note 2)

525

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

Discharge Current

TJ = 25°C, VPIN 4 = 2V (Note 8)

7.8

8.3

8.8

7.8

8.3

8.8

mA

VPIN 4 = 2V (Note 8)

7.5

8.8

7.6

8.8

mA

ABSOLUTE MAXIMUM RATINGS (Note 1)

Note 1. All voltages are with respect to Ground, Pin 5. Currents

are positive into, negative out of the specified terminal. Consult

Packaging Section of Databook for thermal limitations and con-

siderations of packages. Pin numbers refer to DIL package only.

PLCC-20, LCC-20

(TOP VIEW)

Q, L Packages

UC1842A/3A/4A/5A

UC2842A/3A/4A/5A

UC3842A/3A/4A/5A

Supply Voltage (Low Impedance Source) . . . . . . . . . . . . . . 30V

Supply Voltage (ICC mA). . . . . . . . . . . . . . . . . . . . . Self Limiting

Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±1A

Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . 5

µJ

Analog Inputs (Pins 2, 3) . . . . . . . . . . . . . . . . . . -0.3V to +6.3V

Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . 10mA

Power Dissipation at TA

≤ 25°C (DIL-8) . . . . . . . . . . . . . . . . 1W

Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C

Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C

SOIC-14 (TOP VIEW)

D Package

2

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