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| 型号： | SI8250DK |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 20/32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
5.2. Single-Phase Point of Load (POL)
Converter
A 65 W, 400 KHz Si8252 based single phase POL
converter block diagram is shown in Figure 8. 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 overcurrent protection. The input voltage is
measured using the resistor divider network and analog
input port AIN0 of 12bit, 200 kHz ADC0.
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 V IN data until V IN 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 the 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
DIFFERENTIAL
AMPLIFIER
Ipk
range by dynamically adjusting the dead-times. Typical
efficiency simulation results for the POL are shown in
VIN
L
Vout
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
CIN
DRIVER
C
+2.5 V
12.0 V.
95
DRIVER
PH1
VDD
Vsense
Ipk
90
VIN
PH2
AIN0
Ipk
Eff ( Io )
Si8252
GND
85
Figure 8. Single-Phase POL Block Diagram
80
0
5
10
Io
15
20
25
Figure 9. POL Efficiency
20
Rev. 1.0
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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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