- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377776 > LTC3780 (Linear Technology Corporation) DIODE SCHOTTKY DUAL ISOLATED 25V 150mW 0.33V-vf 200mA-IFM 2mA-IF 0.5uA-IR SOT-563 3K/REEL PDF資料下載
參數(shù)資料
| 型號： | LTC3780 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | DIODE SCHOTTKY DUAL ISOLATED 25V 150mW 0.33V-vf 200mA-IFM 2mA-IF 0.5uA-IR SOT-563 3K/REEL |
| 中文描述： | 高效率，同步，四開關(guān)降壓升壓控制器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 421K |
| 代理商： | LTC3780 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
16
LTC3780
3780f
APPLICATIU
Figure 11 is a basic LTC3780 application circuit. External
component selection is driven by the load requirement,
and begins with the selection of R
SENSE
and the inductor
value. Next, the power MOSFETs are selected. Finally, C
IN
and C
OUT
are selected. This circuit can be configured for
operation up to an input voltage of 36V.
W
U
U
R
SENSE
Selection and Maximum Output Current
R
SENSE
is chosen based on the required output current.
The current comparator threshold sets the peak of the
inductor current in Boost mode and the maximum induc-
tor valley current in Buck mode. In Boost mode, the
maximum average load current is:
I
mV V
R
V
I
OUT MAXBOOST
(
IN
OUT
SENSE
L
,
)
–
=
160
2
where
I
L
is peak-to-peak inductor ripple current. In Buck
mode,
the maximum average load current is:
I
mV
R
I
OUT MAXBUCK
(
SENSE
L
,
)
=
+
130
2
Figure 7 shows how the load current (I
MAXLOAD
R
SENSE
)
varies with input and output voltage
Allowing a margin for variations in LTC3780 and external
component values yields:
R
mV V
V
OUT
)
I
I
SENSE
IN
OUT MAXBOOST
(
L BOOST
(
=
+
2 160
2
,
)
Selection of Operation Frequency
The LTC3780 uses a constant frequency architecture and
has an internal voltage controlled oscillator. The switching
frequency is determined by the internal oscillator capaci-
tor. This internal capacitor is charged by a fixed current
plus an additional current that is proportional to the
voltage applied to the PLLFLTR pin. The frequency of this
oscillator can be varied over a 2-to-1 range. The PLLFLTR
pin can be grounded to lower the frequency to 200kHz or
tied to 2.4V to yield approximately 400kHz. When PLLIN is
left open, the PLLFLTR pin goes low, forcing the oscillator
to minimum frequency.
A graph for the voltage applied to the PLLFLTR pin vs
frequency is given in Figure 8. As the operating frequency
is increased the gate charge losses will be higher, reducing
efficiency. The maximum switching frequency is approxi-
mately 400kHz.
V
IN
/V
OUT
(V)
0.1
100
I
M
S
110
120
130
140
160
1
10
3780 F07
150
Figure 7. Load Current vs V
IN
/V
OUT
PLLFLTR PIN VOLTAGE (V)
0
0
O
50
150
200
250
1
2
2.5
450
3780 F08
100
0.5
1.5
300
350
400
Figure 8. Frequency vs PLLFLTR Pin Voltage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3780IG | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3780IUH | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3780EG | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-123 3K/REEL |
| LTC3780EUH | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-323 3K/REEL |
| LTC3830EGN | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3780EG | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP |
| LTC3780EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3780EG#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP T/R |
| LTC3780EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3780EGPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller SSOP24 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。