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LM5026 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LM5026
Giải thích chi tiết về linh kiện  Active Clamp Current Mode PWM Controller
PDF  23 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LM5026 bảng dữ liệu(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
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