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參數(shù)資料
| 型號： | LTC3780EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-123 3K/REEL |
| 中文描述： | 3 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大小： | 421K |
| 代理商： | LTC3780EG |
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20
LTC3780
3780f
APPLICATIU
EXTV
CC
Connection
The LTC3780 contains an internal P-channel MOSFET
switch connected between the EXTV
CC
and INTV
CC
pins.
When the voltage applied to EXTV
CC
rises above 5.7V, the
internal regulator is turned off and a switch connects the
EXTV
CC
pin to the INTV
CC
pin thereby supplying internal
power. The switch remains closed as long as the voltage
applied to EXTV
CC
remains above 5.5V. This allows the
MOSFET driver and control power to be derived from the
output when (5.7V < V
OUT
< 7V) and from the internal
regulator when the output is out of regulation (start-up,
short-circuit). If more current is required through the
EXTV
CC
switch than is specified, an external Schottky
diode can be interposed between the EXTV
CC
and INTV
CC
pins. Ensure that EXTV
CC
≤
V
IN
.
The following list summarizes the three possible connec-
tions for EXTV
CC
:
1. EXTV
CC
left open (or grounded). This will cause INTV
CC
to be powered from the internal 6V regulator at the cost
of a small efficiency penalty.
2. EXTV
CC
connected directly to V
OUT
(5.7V < V
OUT
< 7V).
This is the normal connection for a 6V regulator and
provides the highest efficiency.
3. EXTV
CC
connected to an external supply. If an external
supply is available in the 5.5V to 7V range, it may be
used to power EXTV
CC
provided it is compatible with
the MOSFET gate drive requirements.
W
U
U
Output Voltage
The LTC3780 output voltage is set by an external feedback
resistive divider carefully placed across the output capaci-
tor. The resultant feedback signal is compared with the
internal precision 0.800V voltage reference by the error
amplifier. The output voltage is given by the equation:
V
V
R
R
OUT
=
+
0 8
.
1
2
1
Topside MOSFET Driver Supply (C
A
, D
A
, C
B
, D
B
)
Referring to Figure 11, the external bootstrap capacitors
C
A
and C
B
connected to the BOOST1 and BOOST2 pins
supply the gate drive voltage for the topside MOSFET
Switches A and D. When the top MOSFET Switch A turns
on, the switch node SW2 rises to V
IN
and the BOOST2 pin
rises to approximately V
IN
+ INTVcc. When the bottom
MOSFET Switch B turns on, the switch node SW2 drops to
low and the boost capacitor C
B
is charged through D
B
from
INTV
CC
. When the top MOSFET Switch D turns on, the
switch node SW1 rises to V
OUT
and the BOOST1 pin rises
to approximately V
OUT
+ INTV
CC
. When the bottom MOS-
FET Switch C turns on, the switch node SW1 drops to low
and the boost capacitor C
A
is charged through D
A
from
INTV
CC
. The boost capacitors C
A
and C
B
need to store
about 100 times the gate charge required by the top
MOSFET Switch A and D. In most applications a 0.1
μ
F to
0.47
μ
F, X5R or X7R dielectric capacitor is adequate.
Run Function
The RUN pin provides simple ON/OFF control for the
LTC3780. Driving the RUN pin above 1.5V permits the
controller to start operating. Pulling RUN below 1.5V puts
the LTC3780 into low current shutdown. Do not apply
more than 6V to the RUN pin.
Soft-Start Function
Soft-start reduces the input power sources’ surge cur-
rents by gradually increasing the controller’s current limit
(proportional to an internally buffered and clamped equiva-
lent of V
ITH
).
An internal 1.2
μ
A current source charges up the C
SS
capacitor. As the voltage on SS increases from 0V to 2.4V,
the internal current limit rises from 0V/R
SENSE
to
150mV/R
SENSE
. The output current limit ramps up slowly,
taking 1.5s/
μ
F to reach full current. The output current
thus ramps up slowly, eliminating the starting surge
current required from the input power supply.
T
V
A
μ
C
s F
/
C
IRMP
SS
SS
=
=
(
)
2 4
1 2
.
1 5
.
.
Do not apply more than 6V to the SS pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LTC3780EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 32-Pin QFN EP |
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