LTC3305_15 Datasheet, PDF (20/28 Pages) Linear Technology – Lead-Acid Battery Balancer

LTC3305
Applications Information
START
D1, D2 = CMMSH1-100
D3 = CMMSH2-80
N1A, N1B, N2, N3A, N3B, N4, N5, N6, N7, N8, N9, N10 - SiR882DP
1µF
6V
10nF
100nF
10nF
27.4k
42.2k
12.1k
10µF
25V
CM
V_REG
TERM1
TERM2
MODE
CP
BOOST
V4
EN1
EN2
UVFLT
V3
OVFLT
DONE
BAL
PTCFLT
BATX
V2
BATY LTC3305
CTON
CTOFF
CTBAT
V_L
V1
9
NGATE1-9
V_H
AUXP
I_SET
AUXN
GND
S
D
Q
CLK
RQ
D2
249Ω
10µF
25V
10µF
25V
10µF
25V
10µF
25V
10µF
25V
1.33k
NGATE5
D1
6.04k
N5
6.04k
NGATE4 ₊
BAT4
N4
3.01k
NGATE3
N3A
N3B
6.04k
NGATE2
+
BAT3
+
BAT2
N2A
N2B
NGATE6
6.04k
N6
NGATE7
6.04k
NGATE1
+
6.04k
BAT1
N1
2.2µF
100V
SS
V_IN RUN
FBO
ISET
SW
LTC3630A
VPROG1
FB
GND ^VPROG2
174k
PTC
10µF +
25V
AUX
N10
N7
N8
6.04k
NGATE8
N9
6.04k
NGATE9
N11
D3
100µH
5.11M _{D4, D5, D6 = 1N914}
D4
365k
D5
D6
2.21M
N12
IN^–
V⁺
OUT
REF
2.21M
LTC1440
IN⁺
HYST
365k
V^– GND
40.2k
2.43M
681k
N11, N12 = FDV301N
3305 F07
(a)
BAT1, BAT2, BAT3, BAT4, AUXP-AUXN = 2V/DIV
AUXN = 10V/DIV; START, EN_3305 = 5V/DIV
TIME = 20s/DIV
(b)
AUXP-AUXN = 2V/DIV
AUXN = 10V/DIV; START, EN_3305 = 5V/DIV
TIME = 5s/DIV
(c)
Figure 7. Precharging the Auxiliary Cell Using the LTC3630A and LTC1440
3305f
20
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