Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

LTC3407 Datasheet(PDF) 6 Page - Linear Technology

No. de Pieza. LTC3407
Descripción  Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator
Descarga  16 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo 

LTC3407 Datasheet(HTML) 6 Page - Linear Technology

Zoom Inzoom in Zoom Outzoom out
 6 / 16 page
background image
LTC3407
6
sn3407 3407fs
The LTC3407 uses a constant frequency, current mode
architecture. The operating frequency is set at 1.5MHz and
can be synchronized to an external oscillator. Both chan-
nels share the same clock and run in-phase. To suit a
variety of applications, the selectable Mode pin allows the
user to trade-off noise for efficiency.
The output voltage is set by an external divider returned to
the VFB pins. An error amplfier compares the divided
output voltage with a reference voltage of 0.6V and adjusts
the peak inductor current accordingly. Overvoltage and
undervoltage comparators will pull the POR output low if
the output voltage is not within ±8.5%. The POR output
will go high after 262,144 clock cycles (about 175ms) of
achieving regulation.
OPERATIO
BLOCK DIAGRA
1
2
9
10
8
3
4
11
5
+
+
+
+
EA
UVDET
OVDET
0.6V
7
0.65V
0.55V
+
0.35V
UV
OV
ITH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
S
R
Q
Q
RS
LATCH
BURST
ICOMP
IRCMP
ANTI
SHOOT-
THRU
BURST
CLAMP
SLOPE
COMP
EN
SLEEP
POR
COUNTER
0.6V REF
OSC
OSC
REGULATOR 2 (IDENTICAL TO REGULATOR 1)
PGOOD1
PGOOD2
SHUTDOWN
VIN
VIN
VIN
6
REGULATOR 1
SW1
GND
POR
GND
SW2
5Ω
MODE/SYNC
VFB1
RUN1
RUN2
VFB2
Main Control Loop
During normal operation, the top power switch (P-channel
MOSFET) is turned on at the beginning of a clock cycle
when the VFB voltage is below the the reference voltage.
The current into the inductor and the load increases until
the current limit is reached. The switch turns off and
energy stored in the inductor flows through the bottom
switch (N-channel MOSFET) into the load until the next
clock cycle.
The peak inductor current is controlled by the internally
compensated ITH voltage, which is the output of the error
amplifier.This amplifier compares the VFB pin to the 0.6V
reference. When the load current increases, the VFB volt-
age decreases slightly below the reference. This


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn