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| 型号： | KIT34713EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL BOARD 5A 1MHZ |
| 标准包装： | 1 |
| 系列： | * |
TYPICAL APPLICATIONS
COMPONENT SELECTION
SWITCHING FREQUENCY SELECTION
The switching frequency defaults to a value of 1.0 MHz
when the FREQ pin is grounded, and 200 kHz when the
FREQ pin is connected to VDDI. Intermediate switching
frequencies can be obtained by connecting an external
resistor divider to the FREQ pin. The table below shows the
resulting switching frequency versus FREQ pin voltage.
Table 5. Switching Frequency Adjustment
where,
Maximum OFF time percentage
FREQUENCY
VOLTAGE APPLIED TO PIN FREQ
200
253
307
360
413
466
520
573
627
680
733
787
840
893
947
1000
R FQH
2.341 – 2.500
2.185 - 2.340
2.029 - 2.184
1.873 - 2.028
1.717 – 1.872
1.561 – 1.716
1.405 - 1.560
1.249 - 1.404
1.093 - 1.248
0.936 - 1.092
0.781 - 0.936
0.625 - 0.780
0.469 - 0.624
0.313 - 0.468
0.157 - 0.312
0.000 - 0.156
VDDI
Switching period.
Drain – to – source resistance of FET
Winding resistance of Inductor
Output current ripple.
OUTPUT FILTER CAPACITOR
For the output capacitor, the following considerations are
more important than the actual capacitance value, the
physical size, the ESR and the voltage rating:
Transient Response percentage, TR_%
(Use a recommended value of 2 to 4% to assure a good
transient response.)
Maximum Transient Voltage, TR_v_dip = Vo*TR_%
Maximum current step,
Inductor Current rise time,
FREQ
R FQL
GND
where,
D_max = Maximum ON time percentage.
Figure 7. Resistor Divider for Frequency Adjustment
SELECTION OF THE INDUCTOR
Inductor calculation is straight forward, being
I O = Rated output current.
Vin_min = Minimum input voltage at PV IN
As a result, it is possible to calculate
34713
Analog Integrated Circuit Device Data
16
Freescale Semiconductor
相关PDF资料 |
PDF描述 |
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| KS-1788 | SHELF SLIDING KEYBOARD ASSEMBLY |
| KSDKSTM32-PL | KIT IAR KICKSTART STM32 CORTEXM3 |
相关代理商/技术参数 |
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| KIT34716EPEVBE | 功能描述:电源管理IC开发工具 1.0 MHZ DUAL SWITCH-MODE RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34717EPEVBE | 功能描述:电源管理IC开发工具 5.0 A 1.0MHZ FULLY INTEG RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34727FCEVBE | 功能描述:电源管理IC开发工具 600MA HIGH EFFICIENCY LO RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34825EPEVME | 功能描述:界面开发工具 MICRO USB INTERFACE IC RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| KIT34844AEPEVBE | 功能描述:LED 照明开发工具 IC, 10 CHANNEL LED BACKLIGHT RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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