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LM2576R-ADJ 数据表(PDF) 3 Page - HTC Korea TAEJIN Technology Co.

部件名 LM2576R-ADJ
功能描述  3A, 52kHz, Step-Down Switching Regulator
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制造商  HTC [HTC Korea TAEJIN Technology Co.]
网页  http://www.htckorea.co.kr
标志 HTC - HTC Korea TAEJIN Technology Co.

LM2576R-ADJ 数据表(HTML) 3 Page - HTC Korea TAEJIN Technology Co.

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3A, 52kHz, Step-Down Switching Regulator
LM2576
Dec 2011 – Rev. 1.3
- 3
-
HTC
PIN CONFIGURATION
SOP8-PP
TO220-5L
TO263-5L
PIN DESCRIPTION
Package
Symbol
Description
TO-220 5L
TO-263 5L
SOP8-PP
1
1
VIN
This pin is the positive input supply for the LM2576 step–down
switching regulator.
In order to minimize voltage transients and to supply the switching
currents needed by the regulator, a suitable input bypass capacitor
must be present. (Cin in Figure 1).
2
2
VOUT
This is the emitter of the internal switch. The saturation voltage
VSAT of this output switch is typically 1.5V. It should be kept in mind
that the PCB area connected to this pin should be kept to a
minimum in order to minimize coupling to sensitive circuitry.
3
6
GND
Circuit ground pin. See the information about the printed circuit
board layout.
4
3
FEEDBACK
This pin senses regulated output voltage to complete the feedback
loop.
The signal is divided by the internal resistor divider network R2, R1
and applied to the non–inverting input of the internal error amplifier.
In the adjustable version of the LM2576 switching regulator this pin
is the direct input of the error amplifier and the resistor network R2,
R1 is connected externally to allow programming of the output
voltage.
5
4
ON/OFF
It allows the switching regulator circuit to be shutdown using logic
level signals, thus dropping the total input supply current to
approximately 80uA.
The threshold voltage is typically 1.4V. Applying a voltage above
this value (up to +Vin) shuts the regulator off. If the voltage applied
to this pin is lower than 1.4V or if this pin is left open, the regulator
will be in the "on" condition
-
5, 7, 8
N.C.
No Connect.
* Exposed Pad of SOP8-PP package should be externally connected to GND.
Exposed
PAD
VIN 1
VOUT 2
FEEDBACK 3
ON/OFF 4
8 N.C
7 N.C
6 GND
5 N.C.


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