Datasheet

LT3796/LT3796-1
28
3796fa
For more information www.linear.com/3796
SEPIC Sealed Lead Acid (SLA) Battery Charger
TYPICAL APPLICATIONS
V
CHARGE
, V
FLOAT
vs Temperature
TEMPERATURE (°C)
17.5
37961 TA05b
–40
–30–20 0 10 20 30 40–10 8050 60 70
13.0
14.0
14.5
15.0
15.5
16.0
16.5
17.0
12.5
13.5
V
CHARGE
, V
FLOAT
(V)
V
CHARGE
V
FLOAT
R3
20k
CSPV
S
V
IN
CSN
RT
V
C
FAULT
R6
2k
LT3796
37961 TA05a
CTRL
FB2
CSOUT
PWM
TG
SYNC
V
REF
OUTPUT CURRENT
REPORTING
OPTIONAL INPUT
CURRENT REPORTING
M1: VISHAY SILICONIX Si7456DP
M2: VISHAY SUD19P06-60-E3
M3: ZETEX ZXM61N03F
L1: COILCRAFT MSD1260-333
D1: ON SEMI MBRS260T3G
D2: CENTRAL SEMI CMDZ15L
R11: MURATA NCP18XH103F03RB
ISMON
SS
EN/UVLO
V
REF
FB1
ISP
ISN
VMODE VMODE
FAULT
OUT
BAT
INTV
CC
INTV
CC
GATE
SENSE
GND
C
C
10nF
L1A 33µH
R
SNS1
50mΩM2
I
IN
8V TO 40V
100V (TRANSIENT)
D1
R
SNS2
250mΩ
R
T
19.6k
400kHz
R
C
499Ω
C4
0.1µF
R4
357k
R5
100k
R2
806k
R1
10k
D2
15V
C1
4.7µF
50V
V
IN
BAT
R13
93.1k
R
SNS
15mΩ
M3
M1
R7
40.2k
C3
10nF
CSOUT
R12
30.1k
R11
10k
NTC
R10
10.2k
•
C5
4.7µF
R8
49.9k
R14
49.9k
L1B
C6
2.2µF
100V
OUT
V
CHARGE
= 14.6V
V
FLOAT
= 13.5V
AT 25°C
•
BAT
C2
10µF
+
R9
113k
C7
0.1µF