LT1308BCF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1308BCF' PDF : 20 Pages View PDF
LT1308A/LT1308B
BLOCK DIAGRAMS
VIN
6
VOUT
R1
(EXTERNAL)
FB
FB
2
R2
(EXTERNAL)
VIN
VIN
R5
R6
40k
40k
+
Q4
VC
2VBE
SHUTDOWN
SHDN
3
gm
1
–
ERROR
+
LBI
7+
LBO
Q1
AMPLIFIER
Q2
*
ENABLE
8
×10
R3
BIAS –
A1
200mV
–
A4
30k
COMPARATOR
SW
R4
140k
RAMP
GENERATOR
–
+
Σ
+
+
A2
FF
DRIVER
5
R
Q
Q3
S
600kHz
OSCILLATOR
*HYSTERESIS IN LT1308A ONLY
A=3
0.03Ω
4
GND
1308 BD2a
Figure 2a. LT1308A/LT1308B Block Diagram (SO-8 Package)
VIN 11
VIN 12
R5
40k
VOUT
R1
(EXTERNAL)
FB
Q1
FB
2
R2
(EXTERNAL)
VIN
VIN
R6
40k
+
gm
–
ERROR
AMPLIFIER
Q2
×10
R3
30k
R4
140k
RAMP
GENERATOR
Q4
2VBE
VC
1
BIAS
+
Σ
+
SHUTDOWN
+
*
–
A1
LBI
13 +
ENABLE
–
200mV
COMPARATOR
–
FF
+
A2
R
Q
S
A4
DRIVER
600kHz
OSCILLATOR
A=3
*HYSTERESIS IN LT1308A ONLY
Figure 2b. LT1308A/LT1308B Block Diagram (TSSOP Package)
SHDN
3
LBO
14
SW SW SW
8 9 10
Q3
0.03Ω
4567
GND GND GND GND 1308 BD2b
1308abfb
7
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