UC3842 datasheet(3/11 Pages) STMICROELECTRONICS

Part #	UC3842

Description	CURRENTMODE PWM CONTROLLER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply for -25 < Tamb <

85

°C for UC2824X; 0 < Tamb <70°C for UC384X; Vi = 15V (note 5); RT = 10K; CT = 3.3nF)

Symbo l

Parameter

T est Cond ition s

UC284X

UC384X

Uni t

Mi n. T yp. Max. Min. Typ . Max.

REFERENCE SECTION

VREF

Output Voltage

Tj =25

°CIo = 1mA

4.95

5.00

5.05

4.90

5.00

5.10

V

∆VREF

Line Regulation

12V

≤ Vi ≤ 25V

620

6

20

mV

∆VREF

Load Regulation

1

≤ Io ≤ 20mA

625

6

25

mV

∆VREF/∆T

Temperature Stability

(Note 2)

0.2

0.4

0.2

0.4

mV/

°C

Total Output Variant

Line, Load, Temperature (2)

4.9

5.1

4.82

5.18

V

eN

Output Noise Voltage

10Hz

≤ f ≤ 10KHz Tj =25°C

(2)

50

µV

Long Term Stability

Tamb = 125

°C, 1000Hrs (2)

525

5

25

mV

ISC

Output Short Circuit

-30

-100 -180

-30

-100

-180

mA

OSCILLATOR SECTION

fs

Initial Accuracy

Tj =25

°C (6)

47

52

57

47

52

57

KHz

Voltage Stability

12

≤ Vi ≤ 25V

0.2

1

0.2

1

%

Temperature Stability

TMIN

≤ Tamb ≤ TMAX (2)

55

%

V4

Amplitude

VPIN4 Peak to Peak

1.7

V

ERROR AMP SECTION

V2

Input Voltage

VPIN1 = 2.5V

2.45

2.50

2.55

2.42

2.50

2.58

V

Ib

Input Bias Current

-0.3

-1

-0.3

-2

µA

AVOL

2

≤ Vo ≤ 4V

65

90

65

90

dB

B

Unity Gain Bandwidth

(2)

0.7

1

0.7

1

MHz

SVR

Supply Voltage Rejection

12V

≤ Vi ≤ 25V

60

70

60

70

dB

Io

Output Sink Current

VPIN2 = 2.7V

VPIN1 = 1.1V

2

6

2

6

V

Io

Output Source Current

VPIN2 = 2.3V VPIN1 = 5V

-0.5

-0.8

-0.5

-0.8

mA

VOUT High

VPIN2 = 2.3V;

RL = 15K

Ω to Ground

56

5

6

V

VOUT Low

VPIN2 = 2.7V;

RL = 15K

Ω to Pin 8

0.7

1.1

0.7

1.1

V

CURRENT SENSE SECTION

GV

Gain

(3 & 4)

2.85

3

3.15

2.8

3

3.2

V/V

V3

Maximum Input Signal

VPIN1 = 5V (3)

0.9

1

1.1

0.9

1

1.1

V

SVR

Supply Voltage Rejection

12

≤ Vi ≤ 25V (3)

70

dB

Ib

Input Bias Current

-2

-10

-2

-10

µA

Delay to Output

150

300

150

300

ns

OUTPUT SECTION

IOL

Output Low Level

ISINK = 20mA

0.1

0.4

0.1

0.4

V

ISINK = 200mA

1.5

2.2

1.5

2.2

V

IOH

Output High Level

ISOURCE = 20mA

13

13.5

13

13.5

V

ISOURCE = 200mA

12

13.5

12

13.5

V

tr

Rise Time

Tj =25

°CCL = 1nF (2)

50

150

50

150

ns

tf

Fall Time

Tj =25

°CCL = 1nF (2)

50

150

50

150

ns

UC2842/3/4/5-UC3842/3/4/5

3/11

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