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| 型號(hào)： | LT3750EMS#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CONVERTER 10-MSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 回掃，正向轉(zhuǎn)換器 |
| 應(yīng)用： | 電源控制器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1338 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)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 |
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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
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|---|---|
| LT3751 | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:熱電冷卻器 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:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤 包裝:管件 產(chǎn)品目錄頁(yè)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 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 |
| LT3751EUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Capacitor Charger Controller with Regulation |
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