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LM5041AMTC Arkusz danych(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM5041AMTC
Szczegółowy opis  Cascaded PWM Controller
PDF  16 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5041AMTC Arkusz danych(HTML) 6 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Specifications with standard typeface are for T
J = 25˚C, and those with boldface type apply over full Operating Junction
Temperature range.V
IN = 48V, VCC = 10V, RT = 26.7k
Ω,R
SET = 20k
Ω) unless otherwise stated (Note 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Soft-Start
Soft-start Current
Source
7
10
13
µA
Soft-start to COMP
Offset
0.35
0.55
0.75
V
Oscillator
Frequency1 (RT =
26.7K
Ω)
T
J = 25˚C
180
175
200
220
225
kHz
Frequency2 (RT =
7.87K
Ω)
515
600
685
kHz
Sync threshold
3
3.5
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
Max Duty Cycle
TS = Oscillator Period
(Ts-240ns)/Ts)
%
Min Duty Cycle
COMP = 0V
0
%
COMP to PWM
Comparator Gain
0.32
COMP Open Circuit
Voltage
FB=0V
4.1
4.8
5.5
V
COMP Short Circuit
Current
FB = 0V, COMP = 0V
0.6
1
1.4
mA
Slope Compensation
Slope Comp Amplitude
Delta increase at PWM
Comparator to CS
110
mV
UVLO Shutdown
Under-voltage
Shutdown
2.44
2.5
2.56
V
Under-voltage
Shutdown
Hysteresis Current
Source
16
20
24
µA
Buck Stage Outputs
Output High level
5 (V
REF)V
Output High Saturation
I
OUT = 10mA
REF=V
OUT
0.5
1
V
Output Low Saturation
I
OUT = −10mA
0.5
1
V
Rise Time
C
L = 100pF
10
ns
Fall Time
C
L = 100pF
10
ns
Push-Pull Outputs
Overlap Time
R
SET = 20k
Ω Connected
to GND, 50% to 50%
Transitions
60
90
120
ns
Dead Time
R
SET = 20k
Ω Connected
to REF, 50% to 50%
Transitions
65
95
125
ns
Output High Saturation
I
OUT = 50mA
V
CC -VOUT
0.25
0.5
V
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