參數(shù)資料
型號(hào)： LM2576HV-5MDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
封裝： DIE
文件頁(yè)數(shù)： 11/27頁(yè)
文件大?。?/td> 741K
代理商： LM2576HV-5MDC
Definition of Terms (Continued)
Most standard aluminum electrolytic capacitors in the
100
F–1000
F
range
have
0.5
to 0.1 ESR.
Higher-grade capacitors (“l(fā)ow-ESR”, “high-frequency”, or
“l(fā)ow-inductance”) in the 100 F–1000 F range generally
have ESR of less than 0.15
.
EQUIVALENT SERIES INDUCTANCE (ESL)
The pure inductance component of a capacitor (see
Figure
16). The amount of inductance is determined to a large ex-
tent on the capacitor’s construction. In a buck regulator, this
unwanted inductance causes voltage spikes to appear on
the output.
OUTPUT RIPPLE VOLTAGE
The AC component of the switching regulator’s output volt-
age. It is usually dominated by the output capacitor’s ESR
multiplied by the inductor’s ripple current (
I
IND).
The
peak-to-peak value of this sawtooth ripple current can be de-
termined by reading the Inductor Ripple Current section of
the Application hints.
CAPACITOR RIPPLE CURRENT
RMS value of the maximum allowable alternating current at
which a capacitor can be operated continuously at a speci-
fied temperature.
STANDBY QUIESCENT CURRENT (I
STBY)
Supply current required by the LM2576 when in the standby
mode (ON /OFF pin is driven to TTL-high voltage, thus turn-
ing the output switch OFF).
INDUCTOR RIPPLE CURRENT (
I
IND)
The peak-to-peak value of the inductor current waveform,
typically a sawtooth waveform when the regulator is operat-
ing in the continuous mode (vs. discontinuous mode).
CONTINUOUS/DISCONTINUOUS MODE OPERATION
Relates to the inductor current. In the continuous mode, the
inductor current is always flowing and never drops to zero,
vs. the discontinuous mode, where the inductor current
drops to zero for a period of time in the normal switching
cycle.
INDUCTOR SATURATION
The condition which exists when an inductor cannot hold any
more magnetic flux. When an inductor saturates, the induc-
tor appears less inductive and the resistive component domi-
nates. Inductor current is then limited only by the DC resis-
tance of the wire and the available source current.
OPERATING VOLT MICROSECOND CONSTANT (E
T
op)
The product (in VoIt
s) of the voltage applied to the inductor
and the time the voltage is applied. This E
T
op constant is a
measure of the energy handling capability of an inductor and
is dependent upon the type of core, the core area, the num-
ber of turns, and the duty cycle.
Connection Diagrams (Note 15)
Note 15: (XX indicates output voltage option. See ordering information table
for complete part number.)
Straight Leads
5-Lead TO-220 (T)
Top View
DS011476-21
LM2576T-XX or LM2576HVT-XX
NS Package Number T05A
TO-263 (S)
5-Lead Surface-Mount Package
Top View
DS011476-25
LM2576S-XX or LM2576HVS-XX
NS Package Number TS5B
LM2576SX-XX or LM2576HVSX-XX
NS Package Number TS5B, Tape and Reel
Bent, Staggered Leads
5-Lead TO-220 (T)
Top View
DS011476-22
LM2576T-XX Flow LB03
or LM2576HVT-XX Flow LB03
NS Package Number T05D
www.national.com
19
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