lt3485edd-3-trpbf Linear Technology Corporation, lt3485edd-3-trpbf Datasheet - Page 8

• Manufacturer Part Number: lt3485edd-3-trpbf
• Description: Photoflash Capacitor Chargers With Output Voltage Monitor And Integrated Igbt Drive
• Manufacturer: Linear Technology Corporation

LT3485-0/LT3485-1/
LT3485-2/LT3485-3
FU CTIO AL BLOCK DIAGRA
8
IGBTIN
CHARGE
TO V
U
IN
1
8
7
DRIVER
IGBT
TO GATE OF IGBT
U
IGBT
DRIVER
POWER
SHOT
Q3
ONE-
9
DONE
6
20Ω
Q
S
20k
10
Q
R
V
MONT
TO V
IN
AND HOLD
SAMPLE
C2
TO BATTERY
ENABLE
POWER
CHIP
COMPARATOR
3
LT3485-3: R
LT3485-0: R
LT3485-2: R
LT3485-1: R
V
OUT
C1
A2
R3
4k
W
+
–
SENSE
SENSE
SENSE
SENSE
2
= 0.010Ω
= 0.015Ω
= 0.022Ω
= 0.030Ω
REFERENCE
SHOT
ONE-
1.25V
2.5k
Figure 1
R1
Q2
120k
SHOT
ONE-
60k
R2
R4
COMPARATOR
R
DCM
S
Q
A3
A1
+
+
–
–
DRIVER
20mV
+ –
+
–
45mV
R
SENSE
PRIMARY
3485 F01
Q1
SW
4, 5
11
T1
GND
SECONDARY
D1
V
C
PHOTOFLASH
CAPACITOR
OUT
OUT
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