参数资料
| 型号： | LT3750EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/16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 |
10
LT3750
3750fa
APPLICATIO S I FOR ATIO
WU
UU
The transistor’s continuous drain current rating must
exceed IAVG,M.
Table 4 lists recommended NMOS transistors.
Setting Current Limit
A sense resistor from the SOURCE pin to GND implements
current limit. The current limit is nominally 78mV/RSENSE.
The average power dissipation rating of the current sense
resistor must exceed:
P
IR
V
VN V
RESISTOR
PK
SENSE
OUT PK
T
≥
+
2
3
()
R
RANS
Additionally, there is approximately a 100ns propagation
delay from the time that peak current limit is detected to
when the gate transitions to the low state. This delay
increases the peak current limit by (VTRANS)(tDELAY)/LPRI.
Setting The Target Output Voltage
The parameters that determine the target output voltage
are the resistors RVOUT and RBG, the turns ratio of the
transformer (N), and the voltage drop across the output
diode (VDIODE). The target output voltage is set according
to the following equation:
VV
R
NV
OUT
VOUT
BG
DIODE
=
124
.
–
Use at least 1% tolerance resistors for RVOUT and RBG.
Choosing large value resistors for RBG decreases the
amount of current that charges the parasitic internal
capacitances and degrades the response time of the VOUT
comparator. This may result in overcharging of the output
capacitor. The maximum recommended value for RBG is
2.5k for typical applications.
When high primary currents are used, a voltage spike
can prematurely trip the output voltage comparator. A
33pF to 100pF capacitor in parallel with RBG is sufficient to
filter this spike for most applications. Always check that
the voltage waveform on RBG does not overshoot and that
it reaches a plateau at maximum VOUT.
Discontinuous Mode Detection
The RDCM resistor stands off voltage transients on the
drain node. A 43k, 5% resistor is recommended for 300V
applications. Higher output voltages will require a larger
resistor.
In order for the LT3750 to properly detect discontinuous
mode and start a new charge cycle, the reflected voltage to
the primary winding must exceed the discontinuous mode
comparator threshold which is nominally 36mV. The
worst-case condition occurs when VOUT is shorted to
ground. When this occurs, the reflected voltage is simply
the diode forward voltage drop divided by N.
Table 4. Recommended NMOS Transisitors
MANUFACTURER
PART NUMBER
ID (A)
VDS(MAX) (V)
VGS(MAX) (V)
RDS(ON) (m)
PACKAGE
Philips Semiconductor
PHM21NQ15T
22.2
150
20
55
HVSON8
(www.semiconductors.philips.com)
PHK12NQ10T
11.6
100
20
28
SO-8
PHT6NQ10Y
6.5
100
20
90
SOT223
PSMN038-100K
6.3
100
20
38
SO-8
International Rectifier
IRF7488
6.3
80
20
29
SO-8
(www.irf.com)
IRF7493
9.3
80
20
15
SO-8
IRF6644
10.3
100
20
10.7
DirectFET
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。