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LT1776CS8 Datasheet(PDF) 6 Page - Linear Technology

Part # LT1776CS8
Description  Wide Input Range, High Efficiency, Step-Down Switching Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1776CS8 Datasheet(HTML) 6 Page - Linear Technology

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6
LT1776
10% and 90% duty cycle. The sync function is internally
disabled if the FB pin voltage is low enough to cause
oscillator slowdown. If unused, this pin should be grounded.
FB (Pin 7): This is the inverting input to the feedback
amplifier. The noninverting input of this amplifier is inter-
nally tied to the 1.24V reference. This pin also slows down
the frequency of the internal oscillator when its voltage is
PIN FUNCTIONS
abnormally low, e.g., 2/3 of normal or less. This feature
helps maintain proper short-circuit protection.
VC (Pin 8): This is the control voltage pin which is the
output of the feedback amplifier and the input of the
current comparator. Frequency compensation of the over-
all loop is effected by placing a capacitor, (or in most cases
a series RC combination) between this node and ground.
BLOCK DIAGRA
SWDR
SWDR
SWON
SWON
BOOST
1776 BD
BOOST
SWOFF
SWOFF
LOGIC
OSC
BIAS
VTH
VB
VBG
VBG
FB
VC
GND
SYNC
SHDN
VCC
FB
AMP
BOOST
COMP
gm
I
I
I
I
R1
RSENSE
I
COMP
Q4
Q3
Q2
Q1
Q5
VSW
D1
VIN
5
3
2
1
6
4
8
7



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