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LM5070 Scheda tecnica(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM5070
Spiegazioni elettronici  Integrated Power Over Ethernet PD Interface and PWM Controller
PDF  17 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5070 Scheda tecnica(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
(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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