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参数资料
| 型号： | SI8250DK |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | DEVELOPMENT KIT FOR SI8250/1/2 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 1V |
| 电流 - 输出： | 35A |
| 输入电压： | 36 ~ 75 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，线缆，CD，电源，USB 适配器 |
| 已用 IC / 零件： | SI8250，SI8251，SI8252 |
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Si8250/1/2
5. Example Applications
The Si825x is the ideal choice for digitally-controlled
switched mode power supplies. This section provides a
quick overview of the Si825x in an isolated half-bridge
dc/dc converter and a single-phase point-of-load
converter. Reference designs are available for both of
these. For more details, visit our web site at
www.silabs.com.
5.1. Isolated DC/DC Converter
A 35 W, 400 kHz, Si8250-based half bridge converter is
shown in Figure 7. This circuit is the same as that of the
target (evaluation) board shipped in the Si8250DK
development kit.
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 onboard UART through additional
channels of the isolator IC to the Si8250/1/2.
The Si8250/1/2 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 V IN data from the primary-side MCU until V IN is
within specified limits. At this time, the controller is fully
enabled and executes soft-start by monitoring V OUT
while sequentially incrementing the loop voltage
reference (REFDAC) until the supply output voltage is
within the 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.
P3
DRIVER
180nH
VIN+
0.010
1uH
P4
IRLR8113
. 0.001
VOUT
2.2uF
DRIVER
200
6 x 100uF
Ceramic
6:1
0.01uF
33K
DRIVER
4.7
4.7
FDS3572
4.7
200
IRLR8113
180nH
1K
IOUT
Vsense
120uF
DRIVER
33K
2.2uF
3V3P
10K
~
~
+
-
3.9K
7.5
0.01uF
P3
IPK
PH4
VDD
P4
PH3
DC BAL
AIN
FDS3572
P2
PH2
VIN
IIN
AIN
AIN
TX
P1
Isolator
PH1
RX
1.2nF
1K
GND
C8051F300
3V3P
VDDA
VDDB
3V3P
VDD
Microcontroller
GNDA
GNDB
GND
Si8250
VIN-
Figure 7. Isolated Half-Bridge DC/DC Converter
Digital Controller
Rev. 1.0
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI8250-IM | 功能描述:电压监测器/监控器 SMPS Controller RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| SI8250-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:32K 28 Pin SMPS Controller |
| SI8250-IQ | 功能描述:电压监测器/监控器 SMPS Controller RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| SI8250-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:32K 32 Pin SMPS Controller |
| SI8251 | 制造商:SILABS 制造商全称:SILABS 功能描述:DIGITAL POWER CONTROLLER |
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