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LM5071 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM5071
Description  Power Over Ethernet PD Controller with Auxiliary Power Power Over Ethernet PD Controller with Auxiliary Power
PDF  18 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5071 Datasheet(HTML) 5 Page - 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
(LM5071-80 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
www.national.com
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