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LT1507CS8 데이터시트(PDF) 7 Page - Linear Technology

부품명 LT1507CS8
상세설명  500kHz Monolithic Buck Mode Switching Regulator
PDF  20 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LT1507CS8 데이터시트(HTML) 7 Page - Linear Technology

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7
LT1507
BLOCK DIAGRAM
APPLICATIONS INFORMATION
FEEDBACK PIN FUNCTIONS
The feedback pin (FB or SENSE) on the LT1507 is used to
set output voltage and also to provide several overload
protection features. The first part of this section deals with
selecting resistors to set output voltage and the remaining
part talks about foldback frequency and current limiting
created by the FB pin. Please read both parts before
Note: This application section is adapted from the more
complete version found in the LT1375/LT1376 data sheet.
If more details are desired consult the LT1375/LT1376
Applications Information section, but please acquaint
yourself thoroughly with this LT1507 information first so
that differences between the LT1375 and the LT1507 do
not cause confusion.
Figure 1. Block Diagram
–
+
–
+
–
+
Σ
VIN
2.9V BIAS
REGULATOR
500kHz
OSCILLATOR
FREQUENCY
SHIFT CIRCUIT
VSW
FB/SENSE
7
3
1
8
4
5
2
6
VC
GND
LT1507 • BD
SLOPE COMP
0.1
Ω
BIAS
INTERNAL
VCC
CURRENT
SENSE
AMPLIFIER
VOLTAGE GAIN = 5
SYNC
SHUTDOWN
COMPARATOR
CURRENT
COMPARATOR
ERROR
AMPLIFIER
gm = 2000µmho
FOLDBACK
CURRENT
LIMIT
CLAMP
BOOST
RS
FLIP-FLOP
DRIVER
CIRCUITRY
S
R
0.9V
SHDN
LOCKOUT
COMPARATOR
0.4V
3.5
µA
Q2
Q1
POWER
SWITCH
2.38V
2.42V
–
+



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