Datasheet

LTC3122
8
3122fa
For more information www.linear.com/LTC3122
block DiagraM
3122 BD
LTC3122
PWM
LOGIC
AND
DRIVERS
SHUTDOWN SD
CURRENT
SENSE
TSD
V
REF_UP
OSC
SD
OVLO
ANTI-RING
PWM
BURST
SYNC
CONTROL
3
1
L1
11
12
7
8
10
2
13
+
––
+ –
ADAPTIVE SLOPE COMPENSATION
I
LIM
REF
4
5
9
LDO
V
BEST
V
IN
V
OUT
6
OSCILLATOR OSC
+ –
BULK CONTROL
SIGNALS
SOFT-START
VC CLAMP
SD
TSD
OVLO
REFERENCE
UVLO
THERMAL SD
V
REF_UP
1.202V
TSD
SGND
PGND
EXPOSED PAD
RT
V
CC
V
IN
C
IN
R
T
SW
PWM/SYNC
SD
V
IN
1.8V TO 5.5V
C
VCC
4.7µF
C
OUT
I
ZERO
COMP
OVLO
PGND
16.2V
1.202V
g
m
ERROR
AMPLIFIER
V
OUT
CAP
FB
R1
R2
VC
C
PL
V
C
R
PL
C1
100nF
C
C
R
C
C
F
V
OUT
2.2V TO 15V
THE VALUES OF RC, CC, AND CF ARE BASED UPON OPERATING CONDITIONS.
PLEASE REFER TO COMPENSATING THE FEEDBACK LOOP SECTION FOR
GUIDELINES TO DETERMINE OPTIMAL VALUES OF THESE COMPONENTS.
V
IN
–
+