LM5072

SNVS437D – MARCH 2006 – REVISED APRIL 2013

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Electrical Characteristics

(1) (continued)

Specifications in standard type face are for TJ = +25°C and those in boldface type apply over the full operating junction

temperature range. Unless otherwise specified: VIN = 48V, FOSC = 250kHz.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Soft-start

Soft-start Current Source

8

10

12

µA

Oscillator

Frequency1 (RT = 26.1 kΩ)

175

200

225

KHz

Frequency2 (RT = 8.7 kΩ)

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

Output Low Saturation

0.25

0.75

V

tr

Rise time

CLOAD = 1nF

18

ns

tf

Fall time

CLOAD = 1nF

15

ns

PDI Thermal Shutdown(3)

Thermal Shutdown Temp.

165

°C

Thermal Shutdown Hysteresis

25

°C

Thermal Resistance

θJA

Junction to Ambient

PWP package

40

°C/W

(3)

Device thermal limitations may limit usable range.

6

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