3

UCC15701/2

UCC25701/2

UCC35701/2

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Line Sense

Vth High Line Comparator

3.9

4

4.1

V

Vth Low Line Comparator

0.5

0.6

0.7

V

Input Bias Current

–100

100

nA

Oscillator Section

Frequency

90

100

110

kHz

Frequency

90

100

110

kHz

SYNC VIH

2V

SYNC VIL

0.8

V

SYNC Input Current

VSYNC = 2.0V

3

10

µA

RT Voltage

VFF = 0.4V

0.5

0.6

0.7

V

VFF = 0.8V

0.75

0.8

0.85

V

VFF = 2.0V

1.95

2.0

2.05

V

VFF = 3.2V

3.15

3.2

3.25

V

VFF = 3.6V

3.3

3.4

3.5

V

VFF = 0.8V (Note 1)

0.8

V

VFF = 3.2V (Note 1)

3.2

V

(Note 1)

0

V

Soft Start/Shutdown/Duty Cycle Control Section

10

18

30

A

300

500

750

µA

Saturation

25

100

mV

Fault Counter Section

Threshold Voltage

VFF = 0.8V to 3.2V

3.8

4

4.2

V

Saturation Voltage

VFF = 0.8V to 3.2V

100

mV

Count Charging Current

10

18

30

µA

Current Limit Section

Input Bias Current

–100

0

100

nA

Current Limit Threshold

180

200

220

mV

Shutdown Threshold

500

600

700

mV

Pulse Width Modulator Section

FB Pin Input Impedance

VFB = 3V

30

50

100

k

Minimum Duty Cycle

VFB <= 1V

0

%

Maximum Duty Cycle

VFB >= 4.5V, VSCLAMP >= 2.0V

95

99

100

%

PWM Gain

VFF = 0.8V

35

50

70

%/V

Volt Second Clamp Section

Maximum Duty Cycle

VFF = 0.8V, VSCLAMP = 0.6V

69

74

79

%

Minimum Duty Cycle

VFF = 3.2V, VSCLAMP = 0.6V

17

19

21

%

Output Section

VOH

0.4

1

V

VOL

0.4

1

V

Rise Time

20

100

ns

Fall Time

20

100

ns

Note 1: Guaranteed by design. Not 100% tested in production.