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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(dòng)刷新 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 368K |
| 代理商： | LT3420 |
LT3420/LT3420-1
12
3420fa
APPLICATIU
W
U
U
efficiency of the circuit. In addition, the effective capaci-
tance on the primary is largely dominated by the actual
secondary capacitance. This is simply a result of any
secondary capacitance being multiplied by N
2
when re-
flected to the primary. Since N is generally 10 or higher, a
small capacitance of 10pF on the secondary is 100 times
larger, or 1.0nF, on the primary. This capacitance forms a
resonant circuit with the primary leakage inductance of the
transformer. As such, both the primary leakage induc-
tance and secondary side capacitance should be mini-
mized.
Table 2 shows various predesigned transformers along
with relevant parameters. Contact the individual trans-
former manufacturer for additional information or
customization.
Table 2a. Predesigned Transformers, LT3420
TURNS
L
PART
RATIO
(
μ
H)
SRW10EPC
1:12
24
-U01H003
SIZE
LxWxH (mm)
10.9x10.8x5.2
VENDOR
TDK
(847) 803-6100
www.components.tdk.com
Sumida
(847) 956-0666
www.sumida.com
Pulse
(858) 674-8100
www.pulseeng.com
Kijima Musen
852-2489-8266
kijimahk@netvigator.com
6375-T108
1:12
15
10.8x9.5x3.6
PA0367
1:12
24
9.1x9.1x5.1
SBL-6.4
1:12
17.5
10.3x6.4x5.2
Table 2b. Predesigned Transformers, LT3420-1
TURNS
L
PART
RATIO
(
μ
H)
SBL-5.6S-2
1:10
15
SIZE
LxWxH (mm)
5.6x8.5x3.0
VENDOR
Kijima Musen
852-2489-8266
kijimahk@netvigator.com
TDK
(847) 803-6100
www.components.tdk.com
LDT565630T
-002
1:10.2
14.5
5.8x5.8x3.0
DIODE SELECTION
The rectifying diode(s) should be low capacitance type
with sufficient reverse voltage and forward current rat-
ings. The peak reverse voltage that the diode(s) will see is
approximately:
(
V
OUT
BAT
N V
The peak current of the diode is simply:
V
PK-R
≈
+
) .65
I
I
PK-SEC
PK-SEC
=
=
1 4
.
N
3420
1 0
.
3420 1
(
)
(
)
A
LT
A
N
LT
For the circuit of Figure 1 with V
BAT
of 3.3V, V
PK-R
is 590V
and I
PK-SEC
is 116mA. Table 3 shows various diodes that
can work with the LT3420/LT3420-1. These are chosen for
low capacitance and high reverse blocking voltage. Use
the appropriate number of diodes to achieve the necessary
reverse breakdown voltage.
Table 3
MAX REVERSE CAPACITANCE
VOLTAGE (V)
2x300
PART
GSD2004S
(Dual diode)
(pF)
5
VENDOR
Vishay
(402) 563-6866
www.vishay.com
Philips Semiconductor
(800) 234-7381
www.philips.com
Toshiba
(949) 455-2000
www.semicon.
toshiba.co.jp
BAS21
(Single diode)
250
1.5
ISS306
(Dual Diode)
2x250
3
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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(dòng)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(dòng)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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