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Part Name
Description
LT1246 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1246
1MHz Off-Line Current Mode PWM and DC/DC Converter
Linear Technology
LT1246 Datasheet PDF : 12 Pages
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LT1246/LT1247
TYPICAL APPLICATI S
External Clock Synchronization
V
REF
8
R
T
EXTERNAL
SYNC
INPUT
0.01
µ
F
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.
LT1246 • TA05
V
REF
8
R
COMP
1
C
FEEDBACK
2
I
SENSE
3
–
+
2.5V
Soft Start
5V REF
5.6V
1V
1mA
2R
–
R
+
+
1.5V
–
V
REF
8
R
T
/C
T
4
R2 100k
COMP
1
FEEDBACK
2
–
C
R1
+
2.5V
10
(
V
CLAMP
≈
1.67
R2
R1
+1
Adjustable Clamp Level with Soft Start
LT1246 • TA06
REFERENCE ENABLE
5V REF
UV
MAIN BIAS
LOCKOUT
REFERENCE PULLDOWN
V
CC
OUTPUT
7
PULLDOWN
OSCILLATOR
5.6V
1V
1mA
2R
–
R
+
S
R
BLANKING
+
1.5V
–
OUTPUT
6
18V
GND
5
I
SENSE
3
I
PK (MAX)
≈
V
CLAMP
R
S
WHERE: O
≤
V
CLAMP
≤
1.0V
t
SOFT START
= – ln
1–
V
C
3 • V
CLAMP
R1 R2
C
R1 + R2
V
IN
R
S
LT1246 • TA07
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