參數(shù)資料
型號(hào)： LM2578MWC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 0.75 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, UUC
封裝： WAFER
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 1127K
代理商： LM2578MWC
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Total Supply Voltage
50V
Collector Output to Ground
0.3V to +50V
Emitter Output to Ground (Note 2)
1V to +50V
Power Dissipation (Note 3)
Internally limited
Output Current
750 mA
Storage Temperature
65C to +150C
Lead Temperature
(soldering, 10 seconds)
260C
Maximum Junction Temperature
150C
ESD Tolerance (Note 4)
2 kV
Operating Ratings
Ambient Temperature Range
LM1578A
55C
≤ T
A ≤+125C
LM2578A
40C
≤ T
A ≤+85C
LM3578A
0C
≤ T
A ≤+70C
Junction Temperature Range
LM1578A
55C
≤ T
J ≤+150C
LM2578A
40C
≤ T
J ≤+125C
LM3578A
0C
≤ T
J ≤+125C
Electrical Characteristics
These specifications apply for 2V
≤ V
IN ≤ 40V (2.2V ≤ VIN ≤ 40V for TJ ≤ 25C), timing capacitor CT = 3900 pF, and 25% ≤
duty cycle
≤ 75%, unless otherwise specified. Values in standard typeface are for T
J = 25C; values in boldface type apply for
operation over the specified operating junction temperature range.
LM1578A
LM2578A/
Symbol
Parameter
Conditions
Typical
Limit
LM3578A
Units
(Note 5)
(Note 6)
(Note 11)
Limit
(Note 7)
OSCILLATOR
f
OSC
Frequency
20
kHz
22.4
24
kHz (max)
17.6
16
kHz (min)
f
OSC/T
Frequency Drift with
0.13
%/C
Temperature
Amplitude
550
mV
p-p
REFERENCE/COMPARATOR (Note 8)
V
R
Input Reference
I
1 = I2 = 0 mA and
1.0
V
Voltage
I
1 = I2 = 1mA ±1% (Note 9)
1.035/1.050
1.050/1.070 V (max)
0.965/0.950
0.950/0.930
V (min)
V
R/VIN
Input Reference Volt-
I
1 = I2 = 0 mA and
0.003
%/V
age Line Regulation
I
1 = I2 = 1mA ±1% (Note 9)
0.01/0.02
%/V (max)
I
INV
Inverting Input
I
1 = I2 = 0 mA, duty cycle = 25%
0.5
A
Current
Level Shift Accuracy
Level Shift Current = 1 mA
1.0
%
5/8
10/13
% (max)
V
R/t
Input Reference
100
ppm/1000h
Voltage Long Term
Stability
OUTPUT
V
C (sat)
Collector Saturation
I
C = 750 mA pulsed, Emitter
0.7
V
Voltage
grounded
0.85/1.2
0.90/1.2
V (max)
V
E (sat)
Emitter Saturation
I
O = 80 mA pulsed,
1.4
V
Voltage
V
IN = VC = 40V
1.6/2.1
1.7/2.0
V (max)
I
CES
Collector Leakage
V
IN = VCE = 40V, Emitter
0.1
A
Current
grounded, Output OFF
50/100
200/250
A (max)
BV
CEO(SUS)
Collector-Emitter
I
SUST = 0.2A (pulsed), VIN = 060
V
Sustaining Voltage
50
V (min)
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