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參數(shù)資料
| 型號(hào)： | SI786LSG-E3 |
| 廠商： | Vishay Siliconix |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 236K |
| 描述： | IC REG QD BUCK/LINEAR 28SSOP |
| 標(biāo)準(zhǔn)包裝： | 225 |
| 拓?fù)洌?/td> | 降壓（降壓）（2），線性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 4 |
| 頻率 - 開關(guān)： | 300kHz，200kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 電壓/電流 - 輸出 3： | 5V，5mA |
| 帶 LED 驅(qū)動(dòng)器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 無 |
| 電源電壓： | 5.5 V ~ 30 V |
| 工作溫度： | -10°C ~ 90°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 散裝 |
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www.vishay.com
12
Document Number: 70189
S-40807-Rev. J, 26-Apr-04
Vishay Siliconix
Si786
Product is End of Life 3/2014
OPERATIONAL MODES
PWM Mode
The 3.3 V and 5 V Buck controllers operate in continuous-
current PWM mode when the load demands more than
approximately 25 % of the maximum current (see typical
curves). The duty cycle can be approximated as Duty_Cycle
= V
OUT
/V
IN
.
In this mode, the inductor current is continuous; in the first
half of the cycle, the current slopes up when the high-side
MOSFET conducts and then, in the second half, slopes back
down when the inductor is providing energy to the output
capacitor and load. As current enters the inductor in the first
half-cycle, it is also continuing through to the load; hence, the
load is receiving continuous current from the inductor. By
using this method, output ripple is minimized and smaller
form-factor inductors can be used. The output capacitors
ESR has the largest effect on output ripple. It is typically
under 50 mV; the worst case condition is under light load with
higher input battery voltage.
Pulse-Skipping Mode
When the load requires less than 25 % of its maximum, the
Si786 enters a mode which drives the gate for one clock
cycle and skips the majority of the remaining cycles. Pulse-
skipping mode cuts down on the switching losses, the domi-
nant power consumer at low current levels.
In the region between pulse-skipping mode and PWM mode,
the controller may transition between the two modes, deliv-
ering spurts of pulses. This may cause the current waveform
to look irregular, but will not overly affect the ripple voltage.
Even in this transitional mode efficiency will stay high.
Current Limit
The current through an external resistor, is constantly moni-
tored to protect against over-current. A low value resistor is
placed in series with the inductor. The voltage across it is
measured by connecting it between CS_ and FB_. If this volt-
age is larger than 100 mV, the high-side MOSFET drive is
shut down. Eliminating over-currents protects the MOSFET,
the load and the power source. Typical values for the sense
resistors with a 3 A load will be 25 m?
Figure 4. Boost Supply for Gate Drivers
Level
Translator
DH_
BST_
LX_
DL_
V
L
PWM
V
L
V
L
BATTERY
INPUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI786LSG-T1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual 3.45V Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI786LSG-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual 3.45V Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI7872DP | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Dual N-Channel 30-V (D-S) MOSFET with Schottky Diode |
| SI7872DP-T1 | 功能描述:MOSFET 30V 10A 1.4W RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| SI7872DP-T1-E3 | 功能描述:MOSFET 30V 10A 0.022Ohm RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
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