LT3759(RevB) 데이터 시트보기 (PDF) - Linear Technology
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LT3759 Datasheet PDF : 32 Pages
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LT3759
BLOCK DIAGRAM
VIN
R4 R3
+
CIN
L1
CDC
D1
L2
t FBX
R2 + COUT1
COUT2
R1
VOUT
2.5V
IS3
VC
1
CC2
RC
CC1
1.72V – A11
+
G6
– A12
–0.86V +
FBX
FBX 2
PGOOD
6
1.6V +
A1
–
+
A2
–0.8V –
Q4
G8
1.52V – A13
+
G7
– A14
–0.76V +
FREQUENCY
FOLDBACK
12
EN/UVLO
IS1
2μA
11
VIN
A10
1.22V
2.5V
IS2
10μA
Q3
BANDGAP
REFERENCE
BG INTERNAL BIAS
GENERATOR
BG_LOW
G4
UVLO INTERNAL BIAS
A8
TSD
~165˚C
VC –
+A7
G5
Q2
PWM
COMPARATOR
CURRENT
LIMIT
VIN LDO
1.2V
SR1
RQ
S
A15
2.7V
SLOPE
VISENSE
RAMP
RAMP
GENERATOR
100kHz ~ 1MHz
OSCILLATOR
–
1.25V
+A3
G1
FREQ
FOLDBACK
1.25V
+
+ A4
Q1
–
FREQ
PROG
SS
3
CSS
SYNC
5
RT
4
RT
10
DRIVE
CURRENT
LIMIT
DRIVE LDO
INTVCC 9 CVCC
DRIVER
GATE
G2
8
M1
50mV
A6
SENSE
7
A5
GND
13
RSENSE
3759 F01
Figure 1. LT3759 Block Diagram Working as a SEPIC Converter
3759fb
8
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