Current-Mode PWM Controllers with an Error

Amplifier for Isolated/Nonisolated Power Supplies

_______________________________________________________________________________________

5

CURRENT-LIMIT TRIP THRESHOLD

CURRENT-LIMIT TRIP THRESHOLD (mV)

310

300

290

280

270

5

10

15

20

25

30

0

260

320

TOTAL NUMBER OF

DEVICES = 200

SWITCHING FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

245

260

265

255

250

275

270

280

240

-40

80

+3σ

-3σ

MEAN

TOTAL NUMBER OF

DEVICES = 100

SWITCHING FREQUENCY

SWITCHING FREQUENCY (kHz)

280

270

260

250

240

5

10

15

20

25

30

0

230

290

TOTAL NUMBER OF

DEVICES = 200

PROPAGATION DELAY FROM CURRENT-LIMIT

COMPARATOR INPUT TO NDRV vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

55

60

65

70

75

50

-40

80

UVLO/EN PROPAGATION DELAY

vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

4

3

2

1

7

6

5

13

12

11

10

9

8

14

0

-40

80

UVLO/EN RISING

UVLO/EN FALLING

REFERENCE VOLTAGE

vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

1.226

1.227

1.228

1.229

1.230

1.225

-40

80

INPUT CURRENT

vs. INPUT CLAMP VOLTAGE

INPUT VOLTAGE (V)

27.5

25.0

20.0 22.5

15.0 17.5

12.5

1

2

3

4

5

6

7

8

9

10

0

10.0

30.0

INPUT CLAMP VOLTAGE

vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

25.2

25.4

25.6

25.8

26.0

26.2

26.4

26.6

26.8

27.0

25.0

-40

80

NDRV OUTPUT IMPEDANCE

vs. TEMPERATURE

TEMPERATURE (°C)

60

40

20

0

-20

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

2.1

2.2

1.2

-40

80

SINKING 100mA

Typical Operating Characteristics (continued)