LT3999
TYPICAL APPLICATIONS
30V to 12V, 10W Push-Pull DC Transformer
V
IN
30V
C
10µF
50V
L1
IN
OPTIONAL
V
D1
IN
V
OUT
T1
R1
SYNC
12V
SWA
SWB
499k
•
•
•
•
C
10µF
16V
0.8A
OUT
UVLO
R2
19.1k
OVLO/DC
LT3999
RDC
D2
RT
3999 TA02
ILIM/SS
RBIAS
D1, D2: DIODES INC. B260
L1: COILCRAFT M56132-153
T1: COOPER BUSSMANN CTX02-19062
R
T
GND
R
49.9k
C1
0.1µF
BIAS
28k
500kHz
5V to 5V, 4W Low Part Count Push-Pull DC Transformer
V
IN
5V
C
IN
47µF
10V
V
D1
IN
V
OUT
T1
5V
UVLO
SWA
SWB
•
•
•
•
C
10µF
10V
0.8A
OUT
SYNC
OVLO/DC
LT3999
RDC
D2
RT
3999 TA03
ILIM/SS
RBIAS
D1, D2: CENTRAL SEMI. CMSH1-20M
T1: COILCRAFT PA6383
R
T
GND
R
BIAS
12.1k
1MHz
49.9k
10V-15V to 12V, 200mA Isolated Switching Regulator
V
IN
10V TO 15V
C
10µF
100V
IN
R1
L1
V
OUT
V
715k
IN
D1
39µH
SHDN OUT
12V
T1
C
10µF
25V
OUT1
SYNC
200mA
SWA
SWB
IN
1M
•
•
•
•
R2
36.5k
C1
LT3065
UVLO
C3
10µF
50V
ADJ
180pF
OVLO/DC
REF/BYP
R8
52.3k
D2
D3
R7
10k
L2
39µH
R3
66.5k
0.01µF
R4
39k
LT3999
–V
OUT
SHDN OUT
IN
–12V
R6 200mA
10k
RDC
C
OUT2
10µF
25V
C2
10µF
50V
RT
ILIM
D4
LT3090
ILIM/SS
RBIAS
SET
D1-D4: CENTRAL SEMI. CMSH1-200HE
L1, L2: COILCRAFT XFL3012-393MEG
T1: WÜRTH 750314781
R10
243k
GND
R
T
GND
R
C
R
BIAS
DC
SS
12.1k
1MHz
13.3k
0.01µF 49.9k
3999 TA04
3999fa
12
For more information www.linear.com/LT3999
Linear [ Linear ]
