LT1247C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1247C' PDF : 12 Pages View PDF
LT1246/LT1247
TYPICAL APPLICATI S
External Clock Synchronization
VREF
8
RT
EXTERNAL
SYNC
INPUT
0.01µF
RT/CT
4
CT
5V REF
OSCILLATOR
47Ω
D1 D1 IS REQUIRED IF THE SYNC AMPLITUDE IS
LARGE ENOUGH TO PULL THE BOTTOM OF CT
MORE THAN 300mV BELOW GROUND.
LT1246 • TA05
VREF
8
R COMP
1
C
FEEDBACK
2
ISENSE
3
–
+
2.5V
Soft Start
5V REF
5.6V
1V
1mA
2R
–
R
+
+
1.5V
–
VREF
8
RT/CT
4
R2 100k COMP
1
FEEDBACK
2
–
C R1
+
2.5V
10
( VCLAMP ≈
1.67
R2
R1
+1
Adjustable Clamp Level with Soft Start
LT1246 • TA06
REFERENCE ENABLE
5V REF
UV
MAIN BIAS
LOCKOUT
REFERENCE PULLDOWN
VCC
OUTPUT
7
PULLDOWN
OSCILLATOR
5.6V
1V
1mA
2R
–
R
+
S
R
BLANKING
+
1.5V
–
OUTPUT
6
18V
GND
5
ISENSE
3
IPK (MAX) ≈
VCLAMP
RS
WHERE: O ≤ VCLAMP ≤ 1.0V
tSOFT START = – ln
1–
VC
3 • VCLAMP
R1 R2
C
R1 + R2
VIN
RS
LT1246 • TA07
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