參數(shù)資料
型號(hào)： LTC3780EUH
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-323 3K/REEL
中文描述： 3 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-32
文件頁數(shù)： 12/28頁
文件大小： 421K
代理商： LTC3780EUH
12
LTC3780
3780f
and Switch A is turned on for the remainder of the cycle.
Switches A and B will alternate, behaving like a typical
synchronous buck regulator. The duty cycle of switch A
increases until the maximum duty cycle of the converter in
Buck mode reaches D
MAX_BUCK
, given by:
D
MAX_BUCK
= (1 – D
BUCK-BOOST
) 100%
where D
BUCK-BOOST
= duty cycle of the Buck-Boost switch
range:
D
BUCK-BOOST
= (200ns f) 100%
and f is the operating frequency in Hz.
Figure 3 shows typical Buck mode waveforms. If V
IN
approaches V
OUT
, the Buck-Boost region is reached.
Boost Region (V
IN
< V
OUT
)
Switch A is always on and Synchronous Switch B is always
off in Boost mode. Every cycle, Switch C is turned on first.
Inductor current is sensed when Synchronous Switch C is
turned on. After the sensed inductor current exceeds the
reference voltage which is proportional to V
ITH
, Switch C
is turned off and Synchronous Switch D is turned on for
the remainder of the cycle. Switches C and D will alternate,
behaving like a typical synchronous boost regulator.
OPERATIOU
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
I
L
3780 F04a
(4a) Buck-Boost Mode (V
IN
≥
V
OUT
)
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
I
L
3780 F04b
(4b) Buck-Boost Mode (V
IN
≤
V
OUT
)
Figure 4. Buck-Boost Mode
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
I
0V
2.4V
3780 F03
Figure 3. Buck Mode (V
IN
> V
OUT
)
Buck-Boost (V
IN
V
OUT
)
When V
IN
is close to V
OUT
, the controller is in Buck-Boost
mode. Figure 4 shows typical waveforms in this mode.
Every cycle, if the controller starts with Switches B and D
turned on, Switches A and C are then turned on. Finally,
Switches A and D are turned on for the remainder of the
time. If the controller starts with Switches A and C turned
on, Switches B and D are then turned on. Finally, Switches
A and D are turned on for the remainder of the time.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3780EUH#PBF 功能描述:IC REG CTRLR BST PWM CM 32-QFN 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
LTC3780EUH#PBF 制造商:Linear Technology 功能描述:DC/DC Converter IC
LTC3780EUH#TR 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 T/R
LTC3780EUH#TRPBF 功能描述:IC REG CTRLR BST PWM CM 32-QFN 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
LTC3780EUHPBF 制造商:Linear Technology 功能描述:DC-DC Controller Step-Up/Down 36V QFN32
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