Datasheet

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