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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)： | 11/28頁 |
| 文件大?。?/td> | 421K |
| 代理商： | LTC3780EG |
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11
LTC3780
3780f
OPERATIOU
MAIN CONTROL LOOP
The LTC3780 is a current mode controller that provides an
output voltage above, equal to or below the input voltage.
The LTC proprietary topology and control architecture
employs a current-sensing resistor in Buck or Boost modes.
The sensed inductor current is controlled by the voltage on
the I
TH
pin, which is the output of the amplifier EA. The
V
OSENSE
pin receives the voltage feedback signal, which is
compared to the internal reference voltage by the EA.
The top MOSFET drivers are biased from floating booststrap
capacitors C
A
and C
B
(Figure 11), which are normally
recharged through an external diode when the top MOSFET
is turned off. Schottky diodes across the synchronous
switch D and synchronous switch B are not required, but
provide a lower drop during the dead time. The addition of
the Schottky diodes will typically improve peak efficiency
by 1% to 2% at 400kHz.
The main control loop is shut down by pulling the RUN pin
low. When the RUN pin voltage is higher than 1.5V, an
internal 1.2
μ
A current source charges soft-start capacitor
C
SS
at the SS pin. The I
TH
voltage is then clamped to the
SS voltage while C
SS
is slowly charged during start-up.
This “soft-start” clamping prevents abrupt current from
being drawn from the input power supply.
POWER SWITCH CONTROL
Figure 1 shows a simplified diagram of how the four power
switches are connected to the inductor, V
IN
, V
OUT
and
GND. Figure 2 shows the regions of operation for the
LTC3780 as a function of duty cycle D. The power switches
are properly controlled so the transfer between modes is
continuous. When V
IN
approaches V
OUT
, the Buck-Boost
region is reached; the mode-to-mode transition time is
typically 200ns.
Buck Region (V
IN
> V
OUT
)
Switch D is always on and Switch C is always off during
this mode. At the start of every cycle, Synchronous Switch
B is turned on first. Inductor current is sensed when
Synchronous Switch B is turned on. After the sensed
inductor current falls below the reference voltage, which is
proportional to V
ITH
, Synchronous Switch B is turned off
TG2
BG2
TG1
BG1
R
SENSE
3780 F01
A
B
D
C
L
SW2
SW1
V
IN
V
OUT
Figure 1. Simplified Diagram of the Output Switches
A ON, B OFF
PWM C, D SWITCHES
D ON, C OFF
PWM A, B SWITCHES
FOUR SWITCH PWM
98%
D
BOOST
3%
D
BUCK
D
BOOST
D
BUCK
BOOST REGION
BUCK REGION
BUCK/BOOST REGION
3780 F02
Figure 2. Operating Mode vs Duty Cycle
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LTC3830 | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC3830-1 | 16-Bit Bus Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| LTC3830-1ES8 | 16-Bit Bus Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85 |
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 標準包裝: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:- 標準包裝: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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