參數(shù)資料
型號(hào)： SI8251
廠(chǎng)商： Silicon Laboratories Inc.
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： DIGITAL POWER CONTROLLER
中文描述： 數(shù)字化電源控制器
文件頁(yè)數(shù)： 19/30頁(yè)
文件大?。?/td> 932K
代理商： SI8251
Si8250/1/2
Preliminary Rev. 0.8
19
5. Example Applications
Isolated DC/DC Converter: A 35 W, 400 kHz Si8250-based half bridge converter is shown in Figure 6. This circuit
is the same as that of the target (evaluation) board shipped in the Si8250DK development kit.
Figure 6. Isolated Half-Bridge DC/DC Converter
The Si8250/1/2 is located on the secondary-side of the power supply for optimum transient response. DPWM
outputs PH3 and PH4 control gates of the synchronous rectifiers via a dual driver I.C. DPWM outputs PH1 and
PH2 control the gates of the primary-side switching transistors with isolation provided by a Silicon Laboratories
isolator. A current transformer circuit provides peak current sensing. Primary side analog parameters (input voltage
and current and the filter node voltage) are digitized by a Silicon Laboratories C8051F300 microcontroller and
passed to the Si8250/1/2 using the on-board UART through additional channels of the isolator I.C. to the
Si8250/1/2. The Si8250/1/2 is uses the application software included with the Si8250DK development kit after
being configured for the half-bridge application using the tools supplied in the kit.
When power is applied, the CPU executes an internal reset followed by initialization of all parameters. The
Si8250/1/2 remains in a low-power state, monitoring digitized VIN data from the primary-side MCU until VIN is
within specified limits. At this time, the controller is fully enabled and executes soft-start by monitoring Vout while
sequentially incrementing the loop voltage reference (REFDAC) until the supply output voltage is within specified
range, at which time steady-state operation begins.
During steady-state operation, the MCU operates in interrupt mode where hardware events divert program
execution to specific routines in priority order.
2.2uF
180nH
6 x 100uF
Ceramc
DRIVER
P
IRLR8113
IRLR8113
180nH
.
0.001
6:1
Si8250
Digital Controller
VOUT
P3
P4
PH4
PH3
P2
P1
10K
3.9K
0.01uF
IPK
Vsense
IOUT
C8051F300
Microcontroller
33K
1K
AIN
RX
Isolator
PH2
PH1
0.010
AIN
1uH
33K
1K
VIN+
1.2nF
120uF
VIN-
GND
VDD
3V3P
IIN
DC BAL
AIN
VIN
2.2uF
TX
4
DRIVER
P
4.7
0.01uF
4.7
4.7
7.5
~ +
~ -
FDS3572
FDS3572
DRIVER
P3
DRIVER
P4
200
200
3V3P
VDDA
GNDA
3V3P
VDDB
GNDB
GND
VDD
相關(guān)PDF資料
PDF描述
SI8251-IM DIGITAL POWER CONTROLLER
SI8251-IQ DIGITAL POWER CONTROLLER
SI8252 DIGITAL POWER CONTROLLER
SI8252-IM DIGITAL POWER CONTROLLER
SI8252-IQ DIGITAL POWER CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI8251-IM 功能描述:功率驅(qū)動(dòng)器IC SMPS Controller RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SI8251-IMR 制造商:Silicon Laboratories Inc 功能描述:VOLT SUPERVISOR PWR SUPPLY 0.05V TO 0.8V 28QFN - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC DIGITAL PWR CONTROLLER 32LQFP 制造商:Silicon Laboratories Inc 功能描述:16K 28 Pin SMPS Controller
SI8251-IQ 功能描述:功率驅(qū)動(dòng)器IC SMPS Controller RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SI8251-IQR 制造商:Silicon Laboratories Inc 功能描述:VOLT SUPERVISOR PWR SUPPLY 0.05V TO 0.8V 32LQFP - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC DIGITAL PWR CONTROLLER 32LQFP 制造商:Silicon Laboratories Inc 功能描述:16K 32 Pin SMPS Controller
SI8252 制造商:SILABS 制造商全稱(chēng):SILABS 功能描述:DIGITAL POWER CONTROLLER
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