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Número de pieza
componentes Descripción
LT1245I Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT1245I
High Speed Current Mode Pulse Width Modulators
Linear Technology
LT1245I Datasheet PDF : 16 Pages
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TYPICAL APPLICATI S
External Clock Synchronization
EXTERNAL
SYNC
INPUT
0.01
µ
F
+
V
REF
8
R
T
R
T
/C
T
4
C
T
5V REF
OSCILLATOR
47
Ω
D1
D1 IS REQUIRED IF THE SYNC AMPLITUDE IS LARGE
ENOUGH TO PULL THE BOTTOM OF C
T
MORE THAN
300mV BELOW GROUND.
LT1241 • TA01
V
REF
8
R
COMP
1
C
FB
2
–
+
2.5V
I
SENSE
3
LT1241 Series
Soft Start
5V REF
5.6V
1V
1mA
2R
–
R
+
+
1.5V
–
LT1241 • TA02
Adjustable Clamp Level with Soft Start
V
REF
8
R
T
/C
T
4
R2 100k
COMP
1
FB
2
–
C
R1
+
2.5V
(
V
CLAMP
≈
1.67
R2
R1
+1
5V REF
MAIN BIAS
OSCILLATOR
5.6V
1mA
2R
1V
–
R
+
REFERENCE ENABLE
REFERENCE PULL-DOWN
UV
LOCKOUT
OUTPUT
PULL-DOWN
T
S
R
18V
BLANKING
+
1.5V
–
V
CC
7
OUTPUT
6
GND
5
I
SENSE
3
V
IN
R
S
I
PK (MAX)
≈
V
CLAMP
R
S
WHERE: 0V
≤
V
CLAMP
≤
1.0V
t
SOFT START
= – ln 1 –
V
C
3 • V
CLAMP
C
R1 R2
R1 + R2
LT1241 • TA03
11
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