- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377724 > LT4351IMS (LINEAR TECHNOLOGY CORP) MOSFET Diode-OR Controller PDF資料下載
參數(shù)資料
| 型號： | LT4351IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | MOSFETs |
| 英文描述： | MOSFET Diode-OR Controller |
| 中文描述： | 0.67 A BUF OR INV BASED MOSFET DRIVER, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 270K |
| 代理商： | LT4351IMS |
LT4351
10
sn4351 4351fs
APPLICATIOU
W
U
U
In that case the resistor values are set by:
R
UV
I
UVHYST
R
V
UV
OV
V
UV
V
R
R
V
UV
UV
(
OV
V
R
HYST
UV
FAULT
FAULT
OV
FAULT
UV
OV
FAULT
FAULT
FAULT
UV
3
2
3
1
3
=
=
=
)
–
–
–
Hysteresis helps prevent erratic behavior due to the noise
on V
IN
. Two of the most common noise sources are: V
IN
dipping when the MOSFETs first turn on and draw down the
voltage on the V
IN
capacitors, and the boost regulator switch
turning on and drawing current from the V
IN
capacitors.
Use low ESR capacitors for V
IN
and OUT filtering.
Note that because the UV pin uses current hysteresis,
placing a capacitor on UV to ground to filter noise will
reduce the effective hysteresis. Filtering can be achieved
by splitting the R2 resistor as shown in Figure 4.
To defeat undervoltage fault detection, the UV pin should
be tied higher than 0.33V. UV can be tied to V
IN
provided
V
IN
< 9V. Overvoltage fault detection can be defeated by
grounding the OV pin. Do not exceed V
IN
.
Boost Regulator
The boost regulator will start working as soon as V
IN
is
greater than 0.85V. The regulator will supply all the current
for the gate drive amplifier. While the amplifier itself
requires only about 3mA, larger current pulses are re-
quired when charging the MOSFET gate. The reservoir
capacitor on V
DD
will provide this current (Figure 6).
OVERVOLTAGE FILTERED FAULT
INPUT
REFERRED
OV
REFERRED
UV
REFERRED
V
UV
= 0.33V
V
UV
= 0.3V
V
UV
< 0.3V
V
OV
> 0.3V
V
OV
= 0.3V
4351 F05
OV
FAULT
UV
FAULT
+ UV
HYST
UV
FAULT
UNDERVOLTAGE HYSTERESIS
OVERVOLTAGE FAULT:
GATE LOW
UNDERVOLTAGE FAULT:
GATE LOW
GATE CONTROLLED
BY V
IN
– V
OUT
Figure 5. Graphical Representation of the UV and OV Functions
Figure 6
L1
D1
D2
QSW
GND
SW
V
DD
C
DD
4351 F06
V
IN
LT4351
External Shutdown
To externally turn off the MOSFETs, such as to disable the
supply, use an open-collector transistor pulling down on
the UV pin. Note this will not turn off the boost regulator
which will continue to operate.
The regulator performance is relatively insensitive to the
inductor value. The inductor value does control the fre-
quency of operation. A 4.7
μ
H inductor is recommended
for V
IN
voltages less than 10V and 10
μ
H for V
IN
voltages
greater than 10V. Several inductors that work well with the
LT4351 are listed in Table 1. Many different sizes and
shapes are available. Consult each manufacturer for more
detailed information and for their entire selection of related
parts. The switching frequency for the boost regulator is
around 1MHz so ferrite core inductors should be used to
obtain the best efficiency. The inductor must handle a peak
current of 0.7A minimum and have a DC resistance of
0.5
or less. Shielded inductors are recommended to
reduce the noise due to inductive switching.
Table 1. Recommended Inductors
MAX
DCR
(m
)
90
160
IND
(
μ
H)
4.7
10
PART NUMBER
DS1608C-472
DS1608C-103
VENDOR
Coilcraft
(847) 639-6400
www.coilcraft.com
Sumida
(847) 956-0666
www.sumida.com
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
CDRH4D18-4R7
CDRH4D28-100
4.7
10
125
95
LMNP045B4R7N
LMNP045B100M
4.7
10
50
52
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT4430 | Secondary-Side Optocoupler Driver |
| LT4430ES6 | Secondary-Side Optocoupler Driver |
| LT5503EFE | 1.2GHz to 2.7GHz Direct IQ Modulator and Mixer |
| LT5503 | 1.2GHz to 2.7GHz Direct IQ Modulator and Mixer |
| LT5512EUF | 1kHz-3GHz High Signal Level Down-Converting Mixer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT4351IMS#PBF | 功能描述:IC CTLR MOSFET DIODE-OR 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LT4351IMS#TR | 功能描述:IC CTRLR MOSFET DIODE-OR 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LT4351IMS#TRPBF | 功能描述:IC CTRLR MOSFET DIODE-OR 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LT4352 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage Surge |
| LT4356 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage Surge |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。