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| 型号： | CS51414GDR8G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 4.5 V ~ 40 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 520kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOICN |
| 其它名称： | CS51414GDR8GOS |
CS51411, CS51412, CS51413, CS51414
physically large, and not used in applications where the size,
and especially height is the major concern.
Ceramic capacitors are now available in values over 10 m F.
Since the ceramic capacitor has low ESR and ESL, a single
ceramic capacitor can be adequate for both low frequency
and high frequency noises. The disadvantage of ceramic
capacitors are their high cost. Solid tantalum capacitors can
have low ESR and small size. However, the reliability of the
tantalum capacitor is always a concern in the application
where the capacitor may experience surge current.
Output Capacitor
In a buck converter, the requirements on the output
capacitor are not as critical as those on the input capacitor.
The current to the output capacitor comes from the inductor
IP * P + O
VRIPPLE(ESL) + ESL( IN ) ) ESL( IN
) + ESL( IN )
and thus is triangular. In most applications, this makes the
RMS ripple current not an issue in selecting output
capacitors.
The output ripple voltage is the sum of a triangular wave
caused by ripple current flowing through ESR, and a square
wave due to ESL. Capacitive reactance is assumed to be
small compared to ESR and ESL. The peak ? to ? peak ripple
current of the inductor is:
V (VIN * VO)
(VIN)(L)(fS)
V RIPPLE(ESR) , the output ripple due to the ESR, is equal
to the product of I P ? P and ESR. The voltage developed
across the ESL is proportional to the di/dt of the output
capacitor. It is realized that the di/dt of the output capacitor
is the same as the di/dt of the inductor current. Therefore,
when the switch turns on, the di/dt is equal to (V IN ? V O )/L,
and it becomes V O /L when the switch turns off. The total
ripple voltage induced by ESL can then be derived from
V V * VO V
L L L
Figure 22. The Output Voltage Ripple Using One 100 m F
POSCAP Capacitor
Figure 23. The Output Voltage Ripple Using
One 100 m F OS ? CON
The total output ripple is the sum of the V RIPPLE(ESR) and
V RIPPLE(ESR) .
Figure 24. The Output Voltage Ripple Using
Figure 21. The Output Voltage Ripple Using Two 10 m F
Ceramic Capacitors in Parallel
http://onsemi.com
14
One 100 m F Tantalum Capacitor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS51414GMNR2G | 功能描述:直流/直流开关调节器 1.5A 520kHz BUCK REG LOW VOLTAGE RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| CS5141X-EVM | 制造商:ON Semiconductor 功能描述:CS5141X Evaluation Board |
| CS-514-2DW18 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2-Channel Disk Read/Write Circuit |
| CS-514-2RDW18 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2-Channel Disk Read/Write Circuit |
| CS-5143 | 制造商:CHERRY 制造商全称:CHERRY 功能描述:brushless DC Motor Driver/Controller |
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