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參數(shù)資料
| 型號： | LT3468ES5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封裝： | PLASTIC, SOT-23, MO-193, 5 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 591K |
| 代理商： | LT3468ES5#PBF |
LT3468/LT3468-1/LT3468-2
6
346812f
SW (Pin 1): Switch Pin. This is the collector of the internal
NPN Power switch. Minimize the metal trace area con-
nected to this pin to minimize EMI. Tie one side of the
primary of the transformer to this pin. The target output
voltage is set by the turns ratio of the transformer.
Choose Turns Ratio N by the following equation:
N
VOUT
=
+ 2
31 5
.
Where: VOUT is the desired output voltage.
You must tie a Schottky diode from GND to SW, with the
anode at GND for proper operation of the circuit. Please
refer to the applications section for further information.
GND (Pin 2): Ground. Tie directly to local ground plane.
DONE (Pin 3): Open NPN Collector Indication Pin. When
target output voltage is reached, NPN turns on. This pin
needs a pull-up resistor or current source.
CHARGE (Pin 4): Charge Pin. This pin must be brought
high (>1V) to enable the part. A low (<0.3V) to high (>1V)
transition on this pin puts the part into power delivery
mode. Once the target output voltage is reached, the part
will stop charging the output. Toggle this pin to start
charging again. Ground to shut down. You may bring this
pin low during a charge cycle to halt charging at any time.
VIN (Pin 5): Input Supply Pin. Must be locally bypassed
with a good quality ceramic capacitor. Input supply must
be 2.5V or higher.
UU
U
PI FU CTIO S
BLOCK DIAGRA
W
VIN
SW
+
DONE
CHARGE
C1
T1
R2
60k
Q1
ENABLE
COUT
PHOTOFLASH
CAPACITOR
36mV
20mV
TO BATTERY
D2
Q2
VOUT
D1
LT3468: RSENSE = 0.015
LT3468-2: RSENSE = 0.022
LT3468-1: RSENSE = 0.03
3486 BD
1
GND
5
3
4
2
+
–
+
–
+
–
+
+–
ONE-
SHOT
ONE-
SHOT
DRIVER
PRIMARY
SECONDARY
MASTER
LATCH
RSENSE
DCM COMPARATOR
VOUT COMPARATOR
R1
2.5k
S
RQ
1.25V
REFERENCE
Q3
Q1
QQ
SR
A3
A1
A2
CHIP ENABLE
Figure 1
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