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參數(shù)資料
| 型號(hào)： | SI9166 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High Frequency Programmable Topology Controller |
| 中文描述： | 拓?fù)涓哳l可編程控制器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 217K |
| 代理商： | SI9166 |
Si9166
Vishay Siliconix
New Product
S-60752—Rev. B, 05-Apr-99
6
FaxBack 408-970-5600, request 70847
www.siliconix.com
FUNCTIONAL BLOCK DIAGRAM
DETAIL OPERATIONAL DESCRIPTION
Start-Up
The UVLO circuit prevents the controller output driver and
oscillator circuit from turning on, if the voltage on V
DD
pin is
less than 2.5 V. With typical UVLO hysteresis of 0.1 V,
controller is continuously powered on until the V
DD
voltage
drops below 2.4 V. This hysteresis prevents the converter
from oscillating during the start-up phase and unintentionally
locking up the system. Once the V
DD
voltage exceeds the
UVLO threshold, and with no other shutdown condition
detected, an internal power-on-reset timer is activated while
most circuitry, except the output driver, are turned on. After
the POR time-out of about 1 ms, the internal soft-start
capacitor is allowed to charge. When the soft-start capacitor
voltage reaches 0.5 V, the PWM circuit is enabled.
Thereafter, the constant current charging the soft-start
capacitor will force the converter output voltage to rise
gradually
without
overshooting.
undershoot, the synchronous switch is tri-stated until the duty
cycle reaches about 10%. In tri-state, the high-side p-channel
MOSFET is turned off by pulling up the gate voltage (DH) to
V
S
potential. The low-side n-channel MOSFET is turned off
by pulling down the gate voltage (DL) to PGND potential.
To
prevent
negative
Note that the Si9166 will always soft start in the PWM mode
regardless of the voltage level on the PWM/PSM pin.
Shutdown
The Si9166 is designed to conserve battery life by decreasing
current consumption of IC during normal operation as well as
the shutdown mode. With logic low-level on the SD pin,
current consumption of the Si9166 decreases to less than
1 μA by shutting off most of the circuits. The logic high
enables the controller and starts up as described in Start-Up
section above.
MODE Selection
The Si9166 can be programmed to operate as Buck or Boost
converter. If the MODE pin is connected to AGND, it operates
in buck mode. If the MODE pin is connected to V
DD
, it
operates in boost mode. The DH gate drive output is
designed to drive high-side p-channel MOSFET, acting as the
main switch in buck topology and the synchronous rectifier in
boost topology. The DL gate drive output is designed to drive
low-side n-channel MOSFET, acting as the synchronous
rectifier in buck topology and the main switch in boost
topology.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9166_04 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:High Frequency Programmable Topology Controller |
| SI9166BQ-T1 | 功能描述:電壓模式 PWM 控制器 2MHz Prog Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9166BQ-T1-E3 | 功能描述:電壓模式 PWM 控制器 Programable Topology Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9166DB | 功能描述:電源管理IC開發(fā)工具 SI9166 Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SI9166DB-K | 制造商:Vishay Intertechnologies 功能描述:DEMO BOARD, SI9166, BUCK, BOOST, PWM / PSM, Silicon Manufacturer:Vishay, Silicon |
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