参数资料
| 型号： | LT3750EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER 10-MSOP |
| 标准包装： | 50 |
| 类型： | 回扫，正向转换器 |
| 应用： | 电源控制器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
| 相关产品： | 732-2128-6-ND - TRANS POWR FOR LT3751/LT3750 SMD 732-2128-1-ND - TRANS POWR FOR LT3751/LT3750 SMD 732-2128-2-ND - TRANS POWR FOR LT3751/LT3750 SMD |
9
LT3750
3750fa
APPLICATIO S I FOR ATIO
WU
UU
output capacitor is almost completely charged and is
given by:
I
IV
VN V
AVG D
PK
TRANS
OUT PK
TRANS
,
()
=
+
()
2
The output diode’s continuous forward current rating
must exceed IAVG,D.
At a minimum, the diode must satisfy all the previously
mentioned specifications to guarantee proper operation.
However, to optimize charge time, reverse recovery time
and reverse bias leakage current should be considered.
Excessive diode reverse recovery times can cause appre-
ciable discharging of the output capacitor thereby in-
creasing charge time. Choose a diode with a reverse
recovery time of less than 100ns. Diode leakage current
under high reverse bias bleeds the output capacitor of
charge, also increasing charge time. Choose a diode that
has minimal reverse bias leakage current. Table 2 recom-
mends several output diodes for various output voltages
with adequate reverse recovery time.
can result in improper operation. This most often mani-
fests itself in two ways. The first is when the primary wind-
ing current looks distorted instead of triangular. This
substantially reduces the efficiency and increases the
charge time. The second way is when the LT3750 fails to
detect discontinuous mode after the first switching cycle.
Both of these problems are solved by increasing the amount
of capacitive bypassing for the transformer. Choose ca-
pacitors that can handle the high RMS ripple currents
common in flyback regulators.
Output Capacitor Selection
For photoflash applications, the output capacitor will be
discharged into a Xenon flash bulb. Only a pulse capacitor
or photoflash capacitor is able to survive such a harsh
event. Igniting a typical Xenon bulb requires approxi-
mately 250V to 350V stored on a capacitor on the order of
hundreds of microfarads.
Table 3. Recommended Output Capacitor Vendors
VENDOR
WEBSITE
Rubycon
www.rubycon.com
Cornell Dubilier
www.cornell-dubilier.com
NWL
www.nwl.com
NMOS Selection
Choose an external NMOS with minimal gate charge and
on resistance that satisfies current limit and voltage break-
down requirements. The gate is nominally driven to VCC –
2V during each charge cycle. Ensure that this does not
exceed the maximum gate to source voltage rating of the
NMOS but enhaces the channel enough to minimize the on
resistance. Similarly, the maximum drain-source voltage
rating of the NMOS must exceed VTRANS + VOUT/N or the
magnitude of the leakage inductance spike, whichever is
greater. The maximum instantaneous drain current must
exceed current limit. Because the switching period de-
creases with output voltage, the average current through
the NMOS is greatest when the output is nearly charged
and is given by:
I
IV
VN V
AVG M
PK
OUT PK
TRANS
,
()
=
+
()
2
Table 2. Recommended Output Diodes
PEAK
REPETITIVE
REVERSE
PART
IDC
VOLTAGE
MANUFACTURER
NUMBER
(A)
(V)
PACKAGE
Diodes Inc.
MURS140
1
400
SMB
(www.diodes.com)
MURS160
1
600
SMB
ES2G
2
400
SMB
US1M
1
1000
SMA
Philips
BYD147
1
400
SOD87
(www.semiconductors.
BYD167
1
500
SOD87
philips.com)
Bypass Capacitor Selection
Use a high quality X5R or X7R dielectric ceramic capacitor
placed close to the LT3750 to locally bypass the VCC and
VTRANS pins. For most applications, a 1F to 10F ceramic
capacitor should suffice for VCC and a 1F to 10F for the
VTRANS pin.
The high peak currents flowing through the transformer
necessitate a larger (>>10
F) capacitor to bypass the pri-
mary winding of the transformer. Inadequate bypassing
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4213IDDB#TRMPBF | IC CIRC BREAK ELEC 8-DFN |
| LFEC6E-4FN256C | IC FPGA 6.1KLUTS 195I/O 256-BGA |
| ABB35DHAT | CONN EDGECARD 70POS R/A .050 SLD |
| AMM18DTMI-S189 | CONN EDGECARD 36POS R/A .156 SLD |
| AMM18DTBI-S189 | CONN EDGECARD 36POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3751 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Capacitor Charger Controller with Regulation |
| LT3751EFE#PBF | 功能描述:IC CTRLR CAP CHRGR 20-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| LT3751EFE#PBF | 制造商:Linear Technology 功能描述:; Leaded Process Compatible:Yes; Peak Re |
| LT3751EFE#TRPBF | 功能描述:IC CTRLR CAP CHARGER 20-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT3751EUFD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Capacitor Charger Controller with Regulation |
发布紧急采购，3分钟左右您将得到回复。