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参数资料
| 型号： | CS51411EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR CS51411 HI FREQ |
| 设计资源： | CS51411EVB BOM CS51411EVB Gerber Files CS51411 Demo Brd Schematic |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 1.5A |
| 输入电压： | 4 ~ 16 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 260kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | CS51411 |
| 其它名称： | CS51411EVBOS |
CS51411, CS51412, CS51413, CS51414
turns P1 on and current is routed to the internal bias circuitry
from the BIAS pin.
Here is an example of the power savings:
The input voltage range for V in is 4.5 V to 40 V. The input
voltage range for BIAS is 3.3 V to 6 V. The quiescent current
specification is 3 mA (min), 4 mA (typ), and 6.25 mA (max).
Using a typical battery voltage of 14 V and the typical
quiescent current number of 4 mA, the power would be:
P + V
I + 14
4e ? 3 + 56 mW
We’ll assume the BIAS pin is connected to an external
regulator at 5 V instead of the output voltage. The BIAS pin
would normally be connected to the output voltage, but
adding an added switching regulator efficiency number here
would cloud this example. Now the internal BIAS circuitry
is being powered via 5 V. The resulting on chip power being
dissipated is:
P + V I + 5 4e ? 3 + 21 mW
The power savings is 35 mW.
Now, to demonstrate more notable savings using the
maximum battery input voltage of 40 V, the maximum
quiescent current of 6.25 mA, and the lowest allowed BIAS
voltage for proper operation of 3.3 V;
Powered from V in :
P + 40 6.25e ? 3 + 250 mW
Powered from the BIAS pin:
Figure 19. Input Voltage Ripple in a Buck Converter
To calculate the RMS current, multiply the load current
with the constant given by Figure 20 at each duty cycle. It is
a common practice to select the input capacitor with an RMS
current rating more than half the maximum load current. If
multiple capacitors are paralleled, the RMS current for each
capacitor should be the total current divided by the number
of capacitors.
0.6
P + 3.3
6.25e ? 3 + 21 mW
0.5
The power savings is 229 mW.
Minimum Load Requirement
As pointed out in the previous section, a minimum load is
required for this regulator due to the predriver current
feeding the output. Placing a resistor equal to V O divided by
12 mA should prevent any voltage overshoot at light load
conditions. Alternatively, the feedback resistors can be
valued properly to consume 12 mA current.
0.4
0.3
0.2
0.1
COMPONENT SELECTION
0
0
0.2
0.4 0.6
DUTY CYCLE
0.8
1.0
Input Capacitor
In a buck converter, the input capacitor witnesses pulsed
current with an amplitude equal to the load current. This
pulsed current and the ESR of the input capacitors determine
the V IN ripple voltage, which is shown in Figure 19. For V IN
ripple, low ESR is a critical requirement for the input
capacitor selection. The pulsed input current possesses a
significant AC component, which is absorbed by the input
capacitors.
The RMS current of the input capacitor can be calculated
using:
IRMS + IO D(1 * D)
where:
D = switching duty cycle which is equal to V O /V IN .
I O = load current.
Figure 20. Input Capacitor RMS Current can be
Calculated by Multiplying Y Value with Maximum Load
Current at any Duty Cycle
Selecting the capacitor type is determined by each
design’s constraint and emphasis. The aluminum
electrolytic capacitors are widely available at lowest cost.
Their ESR and Equivalent Series Inductor (ESL) are
relatively high. Multiple capacitors are usually paralleled to
achieve lower ESR. In addition, electrolytic capacitors
usually need to be paralleled with a ceramic capacitor for
filtering high frequency noises. The OS ? CON are solid
aluminum electrolytic capacitors, and therefore has a much
lower ESR. Recently, the price of the OS ? CON capacitors
has dropped significantly so that it is now feasible to use
them for some low cost designs. Electrolytic capacitors are
http://onsemi.com
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS51411GD8 | 功能描述:直流/直流开关调节器 1.5A 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 |
| CS51411GD8G | 功能描述:直流/直流开关调节器 1.5A Low Voltage Buck 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 |
| CS51411GDR8 | 功能描述:直流/直流开关调节器 1.5A 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 |
| CS51411GDR8G | 功能描述:直流/直流开关调节器 1.5A Low Voltage Buck 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 |
| CS51411GMNR2G | 功能描述:直流/直流开关调节器 BUCK REGULATOR 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 |
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