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參數(shù)資料
| 型號(hào)： | LM5070 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Integrated Power Over Ethernet PD Interface and PWM Controller |
| 中文描述： | 集成以太網(wǎng)供電PD接口和PWM控制器 |
| 文件頁(yè)數(shù)： | 5/17頁(yè) |
| 文件大?。?/td> | 833K |
| 代理商： | LM5070 |
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Electrical Characteristics
(Note 3) (Continued)
Specifications in standard type face are for T
J
= +25C and those in
boldface type
apply over the full operating junction tem-
perature range. Unless otherwise specified: V
IN
= 48V, V
CC
= 10V, RT = 30.3k
.
Symbol
Parameter
Conditions
V
CC
Supply
V
CC
UVLO (Rising)
Min
Typ
Max
Units
VccReg –
300mV
5.9
VccReg –
100mV
6.25
1.5
V
CC
UVLO (Falling)
Supply Current (Icc)
6.6
3
V
Cload = 0
mA
Error Amplifier
GBW
Gain Bandwidth
DC Gain
Input Voltage
4
75
MHz
dB
V
FB = COMP
1.219
1.212
5
1.281
1.288
COMP Sink Capability
FB=1.5V COMP=1V
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
Leading Edge Blanking Time
CS Sink Impedance (clocked)
0.44
0.5
0.56
V
55
25
ns
55
Softstart
Softstart Current Source
7
10
13
uA
Oscillator
(Note 5)
Frequency1
(RT = 30.3K)
Frequency2
(RT = 10.5K)
Sync threshold
175
200
225
KHz
505
580
665
KHz
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
COMP=0V
25
ns
Min Duty Cycle
Max Duty Cycle (-80 Device)
Max Duty Cycle (-50 Device)
COMP to PWM Comparator
Gain
COMP Open Circuit Voltage
COMP Short Circuit Current
0
%
%
%
80
50
0.33
4.5
0.6
5.4
1.1
6.3
1.5
V
COMP= 0V
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
- V
OUT
I
out
= 100mA
Cload = 1nF
Cload = 1nF
0.25
0.75
V
Output Low Saturation
Rise time
Fall time
0.25
15
15
0.75
V
ns
ns
L
www.national.com
5
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