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LM2578A Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2578A
Description  Switching Regulator
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2578A Datasheet(HTML) 3 Page - National Semiconductor (TI)

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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
−65˚C to +150˚C
Lead Temperature
(soldering, 10 seconds)
260˚C
Maximum Junction Temperature
150˚C
ESD Tolerance (Note 4)
2 kV
Operating Ratings
Ambient Temperature Range
LM2578A
−40˚C
≤ T
A
≤+85˚C
LM3578A
0˚C
≤ T
A
≤+70˚C
Junction Temperature Range
LM2578A
−40˚C
≤ T
J
≤+125˚C
LM3578A
0˚C
≤ T
J
≤+125˚C
Electrical Characteristics
These specifications apply for 2V
≤ V
IN
≤ 40V (2.2V ≤ V
IN
≤ 40V for T
J
≤ −25˚C), timing capacitor C
T = 3900 pF, and 25%
duty cycle
≤ 75%, unless otherwise specified. Values in standard typeface are for T
J = 25˚C; values in boldface type apply for
operation over the specified operating junction temperature range.
LM2578A/
Symbol
Parameter
Conditions
Typical
LM3578A
Units
(Note 5)
Limit (Note 6)
OSCILLATOR
f
OSC
Frequency
20
kHz
24
kHz (max)
16
kHz (min)
∆f
OSC/
∆T
Frequency Drift with Temperature
−0.13
%/˚C
Amplitude
550
mV
p-p
REFERENCE/COMPARATOR (Note 7)
V
R
Input Reference
I
1 =I2 = 0 mA and
1.0
V
Voltage
I
1 =I2 =1mA ±1% (Note 8)
1.050/1.070
V (max)
0.950/0.930
V (min)
∆V
R/
∆V
IN
Input Reference Voltage Line
Regulation
I
1 =I2 = 0 mA and
0.003
%/V
I
1 =I2 =1mA ±1% (Note 8)
0.01/0.02
%/V (max)
I
INV
Inverting Input Current
I
1 =I2 = 0 mA, duty cycle = 25%
0.5
µA
Level Shift Accuracy
Level Shift Current=1mA
1.0
%
10/13
% (max)
∆V
R/
∆t
Input Reference Voltage Long Term
Stability
100
ppm/1000h
OUTPUT
V
C (sat)
Collector Saturation Voltage
I
C = 750 mA pulsed, Emitter
grounded
0.7
V
0.90/1.2
V (max)
V
E (sat)
Emitter Saturation Voltage
I
O = 80 mA pulsed,
1.4
V
V
IN =VC = 40V
1.7/2.0
V (max)
I
CES
Collector Leakage Current
V
IN =VCE = 40V, Emitter grounded,
Output OFF
0.1
µA
200/250
µA (max)
BV
CEO(SUS)
Collector-Emitter Sustaining Voltage I
SUST = 0.2A (pulsed), VIN = 0
60
V
50
V (min)
CURRENT LIMIT
V
CL
Sense Voltage Shutdown Level
Referred to V
IN or Ground
110
mV
(Note 9)
80
mV (min)
160
mV (max)
www.national.com
3


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