LT3420/LT3420-1
BLOCK DIAGRA S
V
BAT
C1
PRIMARY
R1
R2
DONE
8
2
V
BAT
3
R
FB
1
R
REF
6
C4
PHOTOFLASH
CAPACITOR
R
Q3
S
Q
DRIVER
ONE-
SHOT
Q1
SW
T1
1:12
D1
SECONDARY
V
OUT
CT
C3
10
REFRESH
TIMER
Q
S
R
A3
A2
CHARGE
9
ONE-
SHOT
V
CC
CHIP
ENABLE
POWER DELIVERY BLOCK
V
CC
C2
4
Figure 3. Block Diagram, LT3420
V
BAT
C1
PRIMARY
R1
R2
DONE
8
2
V
BAT
3
R
FB
1
R
REF
6
C4
PHOTOFLASH
CAPACITOR
R
Q3
S
Q
DRIVER
ONE-
SHOT
Q1
SW
T1
1:10
D1
SECONDARY
V
OUT
D3
CT
C3
ENABLE
10
REFRESH
TIMER
Q5
Q
S
R
A3
A2
CHARGE
9
ONE-
SHOT
V
CC
CHIP
ENABLE
POWER DELIVERY BLOCK
V
CC
C2
4
Figure 4. Block Diagram, LT3420-1
3420fa
+
1V
REFERENCE
–
+
MASTER
LATCH
Q
Q4
–
BLOCK
ENABLE
A1
+
1V
REFERENCE
–
+
+
MASTER
LATCH
Q
Q4
–
BLOCK
ENABLE
Q2
A1
+
–
–
W
+
D3
Q5
ENABLE
20mV
0.014Ω
+–
5
GND
10mV
0.25Ω
7
SEC
+–
LT3420
3420 F03
+
20mV
0.02Ω
+–
5
GND
10mV
0.66Ω
7
SEC
+–
LT3420-1
3420 F04
7
LINER [ LINEAR TECHNOLOGY ]
