LM5070 datasheet(5/17 Pages) NSC

부품명	LM5070

상세설명	Integrated Power Over Ethernet PD Interface and PWM Controller

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제조업체	NSC [National Semiconductor (TI)]

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Electrical Characteristics (Note 3) (Continued)

Specifications in standard type face are for T

J= +25˚C and those in boldface type apply over the full operating junction tem-

perature range. Unless otherwise specified: V

IN = 48V, VCC = 10V, RT = 30.3k

Ω.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

V

CC Supply

V

CC UVLO (Rising)

VccReg –

300mV

VccReg –

100mV

V

CC UVLO (Falling)

5.9

6.25

6.6

V

Supply Current (Icc)

Cload = 0

1.5

3

mA

Error Amplifier

GBW

Gain Bandwidth

4

MHz

DC Gain

75

dB

Input Voltage

FB = COMP

1.219

1.212

1.281

1.288

V

COMP Sink Capability

FB=1.5V COMP=1V

5

20

mA

Current Limit

ILIM Delay to Output

CS step from 0 to 0.6V,

time to onset of OUT

transition (90%)

20

ns

Cycle by Cycle Current Limit

Threshold Voltage

0.44

0.5

0.56

V

Leading Edge Blanking Time

55

ns

CS Sink Impedance (clocked)

25

55

Ω

Softstart

Softstart Current Source

7

10

13

uA

Oscillator(Note 5)

Frequency1

(RT = 30.3K)

175

200

225

KHz

Frequency2

(RT = 10.5K)

505

580

665

KHz

Sync threshold

3.1

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 (-80 Device)

80

%

Max Duty Cycle (-50 Device)

50

%

COMP to PWM Comparator

Gain

0.33

COMP Open Circuit Voltage

4.5

5.4

6.3

V

COMP Short Circuit Current

COMP= 0V

0.6

1.1

1.5

mA

Slope Compensation

Slope Comp Amplitude

(LM5070-80 Device Only)

Delta increase at PWM

Comparator to CS

105

mV

Output Section

Output High Saturation

I

out = 50mA,

V

CC -VOUT

0.25

0.75

V

Output Low Saturation

I

out = 100mA

0.25

0.75

V

Rise time

Cload = 1nF

15

ns

Fall time

Cload = 1nF

15

ns

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LM5070 데이터시트(PDF) 5 Page - National Semiconductor (TI)

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