Electrical Characteristics (Note 4) Specifications in standard type face are for T

boldface type apply over the full operating junction temperature range. Unless otherwise specified: V

250kHz. (Continued)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Auxiliary Power Option

ICL_FAUX Threshold

ICL_FAUX Pin Rising

8.1

8.7

9.3

V

ICL_FAUX Pull Down Current

50

µA

RAUX Lower Threshold (I = 22 µA)

RAUX Pin Rising

2.3

2.5

3.0

V

RAUX Upper Threshold (I = 250 µA)

RAUX Pin Falling

5.4

6.0

6.9

V

RAUX Lower Threshold Hysteresis

0.8

V

RAUX Lower Threshold Current

16

22

28

µA

RAUX Upper Threshold Current

187

250

313

µA

VCC Regulator

VccReg

VCC Regulation (VccReg)

7.4

7.7

8

V

VCC Current Limit

15

mA

VCC UVLO (Rising)

VccReg

– 210

mV

VccReg

– 100

mV

V

VCC UVLO (Falling)

5.9

6.2

6.5

V

VIN Supply Current

V

2.0

mA

Supply Current (Icc)

V

3

mA

VCC Regulator Dropout

V

6.5

V

Error Amplifier

Gain Bandwidth

3

MHz

DC Gain

67

dB

Input Voltage

1.225

1.275

V

COMP Sink Capability

5

10

mA

Current Limit

ILIM Delay to Output

30

ns

Cycle by Cycle Current Limit Threshold

Voltage

0.45

0.5

0.55

V

Leading Edge Blanking Time

65

ns

CS Sink Impedance (clocked)

35

55

Ω

Soft-start

Soft-start Current Source

8

10

12

µA

Oscillator

Frequency1 (R

Ω)

175

200

225

KHz

Frequency2 (R

Ω)

515

580

645

KHz

Sync threshold

2.6

3.2

3.8

V

PWM Comparator

Delay to Output

25

ns

Min Duty Cycle

0

%

Max Duty Cycle (-80 Device)

75

80

85

%

Max Duty Cycle (-50 Device)

47

50

53

%

COMP to PWM Comparator Gain

0.33

COMP Open Circuit Voltage

4.3

5.2

6.1

V

COMP Short Circuit Current

0.6

1.0

1.4

mA

Slope Compensation (LM5072-80 Device Only)

Slope Comp Amplitude

70

90

110

mV

Output Section

Output High Saturation

0.25

0.75

V

www.national.com

5