Specifications in standard type face are for T

perature range. Unless otherwise specified: VIN = 48V, VCC = 10V, and RT = 31.6k

Ω. (Note 3)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Oscillator

Frequency1 (RT = 31.6k)

(Note 5)

175

200

225

kHz

Frequency2 (RT = 9.76k)

(Note 5)

560

630

700

kHz

Sync threshold

2.4

3.2

3.8

V

PWM Comparator

Delay to Output

COMP set to 2V,

CS stepped 0 to 0.4V,

Time to onset of OUT

transition low

25

ns

Min Duty Cycle

COMP=0V

0

%

Max Duty Cycle (-1 Device)

75

80

85

%

Max Duty Cycle (-2 Device)

50

%

COMP to PWM Comparator

Gain

0.33

COMP Open Circuit Voltage

4.3

5.2

6.1

V

COMP Short Circuit Current

COMP=0V

0.6

1.1

1.5

mA

Slope Compensation

Slope Comp Amplitude

(LM5020-1 Device Only)

Delta increase at PWM

Comparator to CS

80

105

130

mV

Output Section

Output High Saturation

Iout = 50mA, V

0.25

0.75

V

Output Low Saturation

I

0.25

0.75

V

Rise Time

Cload = 1nF

18

ns

Fall Time

Cload = 1nF

15

ns

Thermal Shutdown

Tsd

Thermal Shutdown Temp.

165

˚C

Thermal Shutdown Hysteresis

25

˚C

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k

Ω resistor.

Note 3: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 4: Device thermal limitations may limit usable range.

Note 5: Specification applies to the oscillator frequency. The operational frequency of the LM5020-2 devices is divided by two.

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