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參數(shù)資料
| 型號： | LTC3803MPS6-5#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 162K |
| 代理商： | LTC3803MPS6-5#TRM |
LTC3803-5
8
38035fd
OPERATION
The undervoltage lockout (UVLO) mechanism prevents
the LTC3803-5 from trying to drive a MOSFET with in-
sufcient VGS. The voltage at the VCC pin must exceed
VTURNON (nominally 4.8V) at least momentarily to enable
LTC3803-5 operation. The VCC voltage is then allowed to
fall to VTURNOFF(nominally4V)beforeundervoltagelockout
disables the LTC3803-5.
The ITH/RUN pin can be driven below VITHSHDN(nominally
0.28V) to force the LTC3803-5 into shutdown. An internal
0.3μA current source always tries to pull this pin towards
VCC. When the ITH/RUN pin voltage is allowed to exceed
VITHSHDN, and VCC exceeds VTURNON, the LTC3803-5
begins to operate and an internal clamp immediately
pulls the ITH/RUN pin up to about 0.7V. In operation, the
ITH/RUN pin voltage will vary from roughly 0.7V to 1.9V
to represent current comparator thresholds from zero
to maximum.
Internal Soft-Start
An internal soft-start feature is enabled whenever the
LTC3803-5 comes out of shutdown. Specically, the ITH/
RUN voltage is clamped and is prevented from reaching
maximum until roughly 0.7ms has passed. This allows
the input and output currents of LTC3803-5-based power
supplies to rise in a smooth and controlled manner on
start-up.
Powering the LTC3803-5
In the simplest case, the LTC3803-5 can be powered from
a high voltage supply through a resistor. A built-in shunt
regulator from the VCC pin to GND will draw as much
current as needed through this resistor to regulate the
VCC voltage to around 8.1V as long as the VCC pin is not
forced to sink more than 25mA. This shunt regulator is
always active, even when the LTC3803-5 is in shutdown,
since it serves the vital function of protecting the VCC pin
from seeing too much voltage.
The VCC pin must be bypassed to ground immediately ad-
jacent to the IC pins with a ceramic or tantalum capacitor.
Proper supply bypassing is necessary to supply the high
transient currents required by the MOSFET gate driver.
10μF is a good starting point.
Adjustable Slope Compensation
The LTC3803-5 injects a 5μA peak current ramp out through
its SENSE pin which can be used for slope compensation in
designs that require it. This current ramp is approximately
linear and begins at zero current at 6.5% duty cycle, reach-
ing peak current at 80% duty cycle. Additional details are
provided in the Applications Information section.
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| LTC3805EDD#PBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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 |
| LTC3805EDD#TRPBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3805EDD-5#PBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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