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參數(shù)資料
| 型號(hào)： | SI8251 |
| 廠商： | Silicon Laboratories Inc. |
| 元件分類： | 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 |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 932K |
| 代理商： | SI8251 |
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Si8250/1/2
20
Preliminary Rev. 0.8
Single Phase POL (point of load) converter: A 65 W, 400 KHz Si8252 based single phase POL converter block
diagram is shown in Figure 7. DPWM outputs PH1 and PH2 control the gates of the buck and synchronous
switching transistors. A lossless current sensing method that relies on the resistor and inductance of the inductor is
used to measure the current for over current protection. The input voltage is measured using resistor divider
network and analog input port AIN0 of 12bit, 200 kHz ADC0.
Figure 7. Single-phase POL Block Diagram
When power is applied, the CPU executes an internal reset followed by initialization of all parameters. The Si8252
remains in a low-power state, monitoring digitized VIN data until VIN is within specified limits. At this time, the
controller is fully enabled and executes soft-start by monitoring output voltage while sequentially incrementing the
loop voltage reference (REFDAC) until the supply output voltage is within specified range, at which time steady-
state operation begins.
As in the previous half-bridge example, transient response is improved by adjusting loop gain at the onset of a
transient (i.e. nonlinear control). The efficiency of the POL converter can be optimized over the complete load
range by dynamically adjusting the dead-times. Typical efficiency simulation results for the POL are shown in
Figure 8. In this case, the single-phase POL operates at a PWM frequency of 400 kHz with an output voltage of
3.3 V and an input voltage range of 10 to 15 V. The curve shows the efficiency with an input voltage of 12.0 V.
Figure 8. POL Efficiency
PH1
PH2
AIN0
Vsense
Ipk
DRIVER
DRIVER
VIN
+2.5 V
CIN
GND
Si8252
VIN
Vout
L
Ipk
DIFFERENTIAL
AMPLIFIER
L
C
VDD
Ipk
0
5
10
15
20
25
80
85
90
95
Eff Io
(
)
Io
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:SILABS 功能描述:DIGITAL POWER CONTROLLER |
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