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LM5026 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM5026
Description  Active Clamp Current Mode PWM Controller
PDF  23 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5026 Datasheet(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 = 30.0k
Ω,R
SET = 34.8k
Ω) unless otherwise stated (Note 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CS Sink Impedance
(clocked)
I
CS = 10mA
30
50
Ω
Over Current Restart
Restart Threshold
2.4
2.55
2.7
V
Fault Charging
Current
7.5
10
12.5
µA
Discharging Current
7.5
10
12.5
µA
Soft-Start
Soft-start Current
Source
38
50
58
µA
Soft-stop Current
Sink
38
50
58
Soft-start Current
Source following a
restart event
0.6
1
1.3
Oscillator
Frequency1
RT = 30.0 k
Ω
180
200
220
kHz
Frequency2
RT = 10.0 k
Ω
520
590
660
kHz
SYNC Source
Current
200
µA
SYNC Sink
Impedance
Can sync up to 5 like
controllers minimum
100
Ω
Sync Threshold
(falling)
1.4
V
Sync Pulse Width
Minimum
15
ns
PWM Comparator
Delay to Output
CS stepped, Time to onset of
OUT_A transition low
40
ns
Mimimum Duty
Cycle
I
COMP = 1mA
0
%
Maximum Duty
Cycle Limit 1
UVLO=1.3V, COMP = open,
V
DCL = 2.5V
80
%
Maximum Duty
Cycle Limit 2
UVLO=1.3V, COMP = open,
V
DCL =VRT x 0.875
70
%
Maximum Duty
Cycle Limit 3
UVLO=2.92V, COMP = open,
V
DCL = 2.5V
40
%
SS to PWM Offset
1.4
V
COMP Input
Impedance
Small signal impedance
1700
Ω
Slope Compensation
Amplitude
Delta increase at PWM
comparator to CS
75
90
115
mV
Output Section
OUT_A High
Saturation
MOS Device @ Iout = -10mA,
5
10
Ω
OUTPUT_A Peak
Current Sink
Bipolar Device @ Vcc/2
3
A
OUT_A Low
Saturation
MOS Device @ Iout = 10mA,
6
9
Ω
www.national.com
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