lm5041sdx National Semiconductor Corporation, lm5041sdx Datasheet - Page 6

• Manufacturer Part Number: lm5041sdx
• Description: Cascaded Pwm Controller
• Manufacturer: National Semiconductor Corporation

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Soft-Start
Oscillator
PWM Comparator
Slope Compensation
UVLO Shutdown
Buck Stage Outputs
Push-Pull Outputs
Electrical Characteristics
Symbol
Specifications with standard typeface are for T
Temperature range. V
Soft-start Current
Source
Soft-start to COMP
Offset
Shutdown Threshold
Frequency1 (RT =
26.7KΩ)
Frequency2 (RT =
7.87KΩ)
Sync threshold
Delay to Output
Max Duty Cycle
Min Duty Cycle
COMP to PWM
Comparator Gain
COMP Open Circuit
Voltage
COMP Short Circuit
Current
Slope Comp Amplitude
Under-voltage
Shutdown
Under-voltage
Shutdown
Hysteresis Current
Source
Output High level
Output High Saturation
Output Low Saturation
Rise Time
Fall Time
Overlap Time
Dead Time
Parameter
IN
= 48V, V
CC
T
COMP set to 2V
CS stepped 0 to 0.4V,
Time to onset of OUT
transition low
TS = Oscillator Period
COMP = 0V
FB = 0V
FB = 0V, COMP = 0V
Delta increase at PWM
Comparator to CS
I
REF = V
I
C
C
R
to GND, 50% to 50%
Transitions
R
to REF, 50% to 50%
Transitions
= 10V, RT = 26.7kΩ, R
OUT
OUT
J
L
L
SET
SET
= 25˚C
= 100pF
= 100pF
= 10mA
= −10mA
= 20kΩ Connected
= 20kΩ Connected
(Continued)
Conditions
OUT
J
= 25˚C, and those with boldface type apply over full Operating Junction
SET
6
= 20kΩ) unless otherwise stated (Note 3)
0.35
0.25
2.44
Min
180
175
515
4.1
0.6
16
60
65
7
(Ts-240ns)/Ts)
5 (V
0.55
0.32
Typ
200
600
110
0.5
4.8
2.5
0.5
0.5
10
25
20
10
10
90
95
3
1
REF
)
Max
0.75
0.75
2.56
220
225
685
120
125
3.5
5.5
1.4
13
24
0
1
1
Units
kHz
kHz
mA
mV
µA
µA
ns
ns
ns
ns
ns
%
%
V
V
V
V
V
V
V
V