TL284x, TL384x

CURRENT-MODE PWM CONTROLLERS

SLVS038E – JANUARY 1989 – REVISED DECEMBER 1999

4

POST OFFICE BOX 655303

reference section

PARAMETER

TEST CONDITIONS

TL284x

TL384x

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

Output voltage

IO = 1 mA,

TA = 25°C

4.95

5

5.05

4.9

5

5.1

V

Line regulation

VCC = 12 V to 25 V

6

20

6

20

mV

Load regulation

IO = 1 mA to 20 mA

6

25

6

25

mV

Temperature coefficient

of output voltage

0.2

0.4

0.2

0.4

mV/

°C

Output voltage

with worst-case variation

VCC = 12 V to 25 V,

IO = 1 mA to 20 mA

4.9

5.1

4.82

5.18

V

Output noise voltage

f = 10 Hz to 10 kHz,

TA = 25°C

50

50

µV

Output-voltage long-term drift

After 1000 h at TA = 25°C

5

25

5

25

mV

Short-circuit output current

–30

–100

–180

–30

–100

–180

mA

† All typical values are at TA = 25°C.

NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.

oscillator section

PARAMETER

TEST CONDITIONS

TL284x

TL384x

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

Oscillator frequency (see Note 5)

TA = 25°C

47

52

57

47

52

57

kHz

Frequency change with supply voltage

VCC = 12 V to 25 V

2

10

2

10

Hz/kHz

Frequency change with temperature

50

50

Hz/kHz

Peak-to-peak amplitude at RT/CT

1.7

1.7

V

† All typical values are at TA = 25°C.

NOTES:

4. Adjust VCC above the start threshold before setting it to 15 V.

5. Output frequency equals oscillator frequency for the TLx842 and TLx843. Output frequency is one-half oscillator frequency for the

TLx844 and TLx845.

error-amplifier section

PARAMETER

TEST CONDITIONS

TL284x

TL384x

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

Feedback input voltage

COMP at 2.5 V

2.45

2.50

2.55

2.42

2.50

2.58

V

Input bias current

–0.3

–1

–0.3

–2

µA

Open-loop voltage amplification

VO = 2 V to 4 V

65

90

65

90

dB

Gain-bandwidth product

0.7

1

0.7

1

MHz

Supply-voltage rejection ratio

VCC = 12 V to 25 V

60

70

60

70

dB

Output sink current

VFB at 2.7 V,

COMP at 1.1 V

2

6

2

6

mA

Output source current

VFB at 2.3 V,

COMP at 5 V

–0.5

–0.8

–0.5

–0.8

mA

High-level output voltage

VFB at 2.3 V,

RL = 15 kΩ to GND

5

6

5

6

V

Low-level output voltage

VFB at 2.7 V,

RL = 15 kΩ to GND

0.7

1.1

0.7

1.1

V

† All typical values are at TA = 25°C.

NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.