UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP

CURRENT-MODE PWM CONTROLLER

SGLS134B – SEPTEMBER 2002 – REVISED APRIL 2003

3

POST OFFICE BOX 655303

30 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

self limiting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±1 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output energy (capacitive load)

5

µJ

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Inputs (pins 3, 5)

–0.3 V to 6.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Error Amp Output Sink current

10 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

97

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

_C to 150_C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds

260

_C

. . . . . . . . . . . . . . . . . . . . . . .

† 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.

‡ Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.

NOTE 1: Long term high–temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction

of overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Reference Section

Output voltage

IO = 1 mA

4.95

5.0

5.05

V

Line regulation voltage

VIN = 12 V to 25 V

6

20

mV

Load regulation voltage

IO = 1 mA to 20 mA

6

25

mV

Temperature stability

See Notes 2 and 3

0.2

0.4

mV/

_C

Total output variation voltage

Line, Load, Temp.

4.9

5.1

V

Output noise voltage

f = 10 Hz to 10 kHz,

See Note 2

TJ = 25_C

50

µV

Long term stability

1000 hours,

See Note 2

TA = 125_C

5

25

mV

Output short-circuit current

–30

–100

–180

mA

Oscillator Section

Initial accuracy

See Note 4

TJ = 25_C

47

52

57

kHz

Voltage stability

VCC = 12 V to 25 V

0.2

1

%

Temperature stability

TA = MIN to MAX, See Note 2

5

%

Amplitude peak-to-peak

V pin 7,

See Note 2

1.7

V

Discharge current

V pin 7

2 V

See Note 5

TJ = 25_C

7.8

8.3

8.8

mA

Discharge current

V pin 7 = 2 V,

See Note 5

TJ = Full range

7.5

8.8

mA