參數(shù)資料
型號(hào)： 16MV4700WX
廠商： National Semiconductor Corporation
英文描述： CONNECTOR ASSEMBLIES
中文描述： N溝道場(chǎng)效應(yīng)管同步降壓穩(wěn)壓控制器輸出電壓低
文件頁(yè)數(shù)： 9/22頁(yè)
文件大?。?/td> 602K
代理商： 16MV4700WX
Block Diagram
20049401
Application Information
THEORY OF OPERATION
The LM2727 is a voltage-mode, high-speed synchronous
buck regulator with a PWM control scheme. It is designed for
use in set-top boxes, thin clients, DSL/Cable modems, and
other applications that require high efficiency buck convert-
ers. It has power good (PWRGD), output shutdown (SD),
over voltage protection (OVP) and under voltage protection
(UVP). The over-voltage and under-voltage signals are OR
gated to drive the Power Good signal and a shutdown latch,
which turns off the high side gate and turns on the low side
gate if pulled low. Current limit is achieved by sensing the
voltage V
DS
across the low side FET. During current limit the
high side gate is turned off and the low side gate turned on.
The soft start capacitor is discharged by a 95μA source
(reducing the maximum duty cycle) until the current is under
control. The LM2737 does not latch off during UVP or OVP,
and uses the HIGH and LOW comparators for the power-
good function only.
START UP
When V
exceeds 4.2V and the enable pin EN sees a logic
high the soft start capacitor begins charging through an
internal fixed 10μA source. During this time the output of the
error amplifier is allowed to rise with the voltage of the soft
start capacitor. This capacitor, Css, determines soft start
time, and can be determined approximately by:
An application for a microprocessor might need a delay of
3ms, in which case C
would be 12nF. For a different
device, a 100ms delay might be more appropriate, in which
case C
would be 400nF. (390 10%) During soft start the
PWRGD flag is forced low and is released when the voltage
reaches a set value. At this point this chip enters normal
operation mode, the Power Good flag is released, and the
OVP and UVP functions begin to monitor Vo.
NORMAL OPERATION
While in normal operation mode, the LM2727/37 regulates
the output voltage by controlling the duty cycle of the high
side and low side FETs. The equation governing output
voltage is:
The PWM frequency is adjustable between 50kHz and
2MHz and is set by an external resistor, R
, between the
FREQ pin and ground. The resistance needed for a desired
frequency is approximately:
L
www.national.com
9
相關(guān)PDF資料
PDF描述
16MV680WG 6 PIN MINI DIN CABLE MM 20 FT
16MXR5600M20X25 LARGE CAN TYPE ALUMINUM ELECTROLYTIC CAPACITORS
16MXR6800M20X30 LARGE CAN TYPE ALUMINUM ELECTROLYTIC CAPACITORS
16MXR6800M22X25 LARGE CAN TYPE ALUMINUM ELECTROLYTIC CAPACITORS
16MXR8200M20X35 LARGE CAN TYPE ALUMINUM ELECTROLYTIC CAPACITORS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
16MX16TI 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:256 Megabit Synchronous DRAM
16MX64PC133 制造商:MAJOR 功能描述:
16MXC10000MEFC20X35 功能描述:10000μF 16V Aluminum Capacitors Radial, Can - Snap-In 3000 Hrs @ 105°C 制造商:rubycon 系列:MXC 包裝:* 零件狀態(tài):在售 電容:10000μF 容差:±20% 額定電壓:16V ESR（等效串聯(lián)電阻）:- 不同溫度時(shí)的使用壽命:105°C 時(shí)為 3000 小時(shí) 工作溫度:-40°C ~ 105°C 極化:極化 應(yīng)用:通用 紋波電流:2.15A @ 120Hz 阻抗:- 引線間距:0.394"（10.00mm） 大小/尺寸:0.787" 直徑（20.00mm） 高度 - 安裝（最大值）:1.457"（37.00mm） 表面貼裝焊盤(pán)尺寸:- 安裝類(lèi)型:通孔 封裝/外殼:徑向，Can - 卡入式 標(biāo)準(zhǔn)包裝:200
16MXC10000MEFC22X30 功能描述:10000μF 16V Aluminum Capacitors Radial, Can - Snap-In 3000 Hrs @ 105°C 制造商:rubycon 系列:MXC 包裝:散裝 零件狀態(tài):在售 電容:10000μF 容差:±20% 額定電壓:16V ESR（等效串聯(lián)電阻）:- 不同溫度時(shí)的使用壽命:105°C 時(shí)為 3000 小時(shí) 工作溫度:-40°C ~ 105°C 極化:極化 應(yīng)用:通用 紋波電流:2.15A @ 120Hz 阻抗:- 引線間距:0.394"（10.00mm） 大小/尺寸:0.866" 直徑（22.00mm） 高度 - 安裝（最大值）:1.260"（32.00mm） 表面貼裝焊盤(pán)尺寸:- 安裝類(lèi)型:通孔 封裝/外殼:徑向，Can - 卡入式 標(biāo)準(zhǔn)包裝:200
16MXC10000MEFCSN22X30 功能描述:CAP ALUM 10000UF 16V 20% SNAP-IN RoHS:是 類(lèi)別:電容器 >> 鋁 系列:* 標(biāo)準(zhǔn)包裝:2,000 系列:142 RHS 電容:4700µF 額定電壓:10V 容差:±20% 壽命@溫度:105°C 時(shí)為 2000 小時(shí) 工作溫度:-40°C ~ 105°C 特點(diǎn):通用 紋波電流:1.26A ESR（等效串聯(lián)電阻）:- 阻抗:- 安裝類(lèi)型:通孔 封裝/外殼:徑向，Can 尺寸/尺寸:0.492" 直徑（12.50mm） 高度 - 座高（最大）:1.063"（27.00mm） 引線間隔:0.197"（5.00mm） 表面貼裝占地面積:- 包裝:散裝
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*