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參數(shù)資料
| 型號： | LT3420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Photoflash Capacitor Chargers with Automatic Refresh |
| 中文描述： | 照相閃光燈電容充電器，具有自動刷新 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 368K |
| 代理商： | LT3420 |
LT3420/LT3420-1
6
3420fa
PIU
R
REF
(Pin 1):
Reference Resistor Pin. Place a resistor (R2)
from the R
REF
pin to GND. 2k is recommended.
V
BAT
(Pin 2):
Battery Voltage Input. This pin should be
connected to the power supply or battery, which supplies
power to transformer T1. Must be locally bypassed.
R
FB
(Pin 3):
Feedback Resistor Pin. Place a resistor (R1)
from the SW pin to the R
FB
pin. Set R1 according to the
following formula:
[
R
R
N
R
N
R
N V
(
V
SEC
OUT
D
1
2
2
1 4
( .
2
=
+
+
]
)
)
(LT3420)
R
R
(
N V
(
V
SEC
OUT
D
1
2
2
2
=
+
+
[
]
)
)
(LT3420-1)
V
OUT
: Desired Output Voltage
N: Transformer Turns Ratio
R
SEC
: Transformer Secondary Resistance
V
D
: Diode Forward Voltage Drop
R2: Resistor from the R
REF
Pin to GND. 2k is a Typical
Choice
V
CC
(Pin 4):
Input Supply Pin. Must be locally bypassed
with a 4.7
μ
F or larger ceramic capacitor.
GND (Pin 5):
Ground. Tie directly to local ground plane.
SW (Pin 6):
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.
SEC (Pin 7):
Transformer Secondary Pin. Tie one end of
the transformer secondary to this pin. Take care to use the
correct phasing of the transformer (Refer to Figures 1
and2).
DONE (Pin 8):
Done Output Pin. Open collector NPN
output. DONE is pulled low whenever the chip is delivering
power to the output and goes high when power delivery
stops.
CHARGE (Pin 9):
Charge Pin. Drive CHARGE high (1.5V or
more) to commence charging of the output capacitor.
Drive to 0.2V or less to put the part in shutdown mode.
C
T
(Pin 10):
Refresh Timer Capacitor Pin. Place a capacitor
from the C
T
pin to GND to set the refresh timer sample rate
according to the following formula:
C
T
= 2.5 10
–6
t
REFRESH
t
REFRESH
: Desired Refresh Period in Seconds.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3420-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers with Automatic Refresh |
| LT3420EDD#PBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LT3420EDD#TR | 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Photoflash Capacitor Charger w/ Automatic Top-Off |
| LT3420EDD#TRPBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LT3420EDD-1#PBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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