Datasheet

LTC3863
32
3863f
For more information www.linear.com/3863
TYPICAL APPLICATIONS
Efficiency Gain/Phase
Figure 14. 12V to 42V Input, –48V/300mA Output, 440kHz Inverting Converter
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
440kHz
27mΩ
L1
10µH
Q1
D1
CAP
0.47µF
PGND
LTC3863
3863 F14a
SS
ITH
FREQ
SGND
RUN
V
IN
PLLIN/MODE
SENSE
GATE
V
FBN
V
FB
1M
64.9k
196k
V
OUT
–48V
300mA
3.32k
C
IN1
: NICHICON UCJ1H101MCL1GS
C
IN2
: MURATA GRM32ER71H106H
C
OUT1
: TDK CGA6M3X7S2A475K
C
OUT3
: UCC EMVH630ARA101MKE
D1: DIODES PDS5100H
L1: WURTH 744314101
Q1: VISHAY SI7113DN
V
IN
12V TO 42V
C
IN1
100µF
50V
C
OUT1
4.7µF
100V
×2
C
IN2
10µF
50V
×2
C
OUT3
100µF
63V
18nF
0.1µF
100pF
+
+
LOAD CURRENT (A)
0.001
40
EFFICIENCY (%)
POWER LOSS (W)
60
90
80
0.01 0.1
3863 F14b
20
30
50
70
10
0
4
6
9
8
2
3
5
7
1
0
EFFICIENCY
POWER LOSS
V
IN
= 24V
V
OUT
= –48V
PULSE-SKIPPING MODE
Burst Mode OPERATION
FREQUENCY (kHz)
2
–30
GAIN (dB)
PHASE (DEG)
–10
10
30
50
20 200
3863 F14c
70
–20
0
20
40
60
–45
–15
15
0
45
75
105
–30
PHASE
GAIN
30
60
90
V
IN
= 24V
V
OUT
= –48V