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参数资料
| 型号： | MAX16955EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX16955 |
| 其它有关文件： | Automotive Product Guide |
| 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： | 5V |
| 电流 - 输出： | 5A |
| 输入电压： | 6 ~ 36 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 |
| 已用 IC / 零件： | MAX16955 |
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
Therefore:
Solving for R C :
g m , EA FB × GAIN MOD ( fC ) × f zMOD
GAIN MOD ( fC ) ×
V FB
V OUT
× g m , EA × R C = 1
R C =
× V
V OUT × f C
Solving for R C :
Set the error-amplifier compensation zero formed by R C
g m , EA FB × GAIN MOD ( fC )
C C =
R C =
× V
V OUT
and C C at the f pMOD (f zEA = f pMOD ):
1
2 π × f 2 MOD × R C
Set the error-amplifier compensation zero formed by R C
and C C (f zEA ) at the f pMOD . Calculate the value of C C
as follows:
If f zMOD is less than 5 × f C , add a second capacitor C F
from COMP to SGND. Set f pEA = f zMOD and calculate
C F as follows:
C C =
1
2 π × f pMOD × R C
C F =
1
2 π × R C × f zMOD
If f zMOD is less than 5 x f C , add a second capacitor,
C F , from COMP to SGND and set the compensation
pole formed by R C and C F (f pEA ) at the f zMOD .
Calculate the value of C F as follows:
MOSFET Selection
The MAX16955’s controller drives two external logic-
level n-channel MOSFETs as the circuit switch ele-
ments. The key selection parameters to choose these
C F =
1
2 π × f zMOD × R C
MOSFETs include:
? On-resistance (R DS(ON) )
? Maximum drain-to-source voltage (V DS(MAX) )
As the load current decreases, the modulator pole also
decreases; however, the modulator gain increases
accordingly and the crossover frequency remains the
same.
For the case where f zMOD is less than f C :
The power-modulator gain at f C is:
?
?
?
?
Minimum threshold voltage (V TH(MIN) )
Total gate charge (Q G )
Reverse-transfer capacitance (C RSS )
Power dissipation
GAIN MOD ( fC ) = GAIN MOD ( dc ) ×
f pMOD
f zMOD
R1
V OUT
GAIN EA ( fC ) = g m , EA × R C × zMOD
The error-amplifier gain at f C is:
f
f C
R2
V REF
g m
R C
COMP
Therefore:
GAIN MOD ( fC ) × × g m , EA C × = 1
× R
Maxim Integrated
V FB f zMOD
V OUT f C
Figure 5. Compensation Network
C C
C F
21
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相关代理商/技术参数 |
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|---|---|
| MAX16955EVKIT# | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit 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 |
| MAX16955EVKIT+ | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit 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 |
| MAX16956AUBA/V+T | 制造商:Maxim Integrated Products 功能描述:36V, 300MA, MINI BUCK CONVERTER WITH 2UA IQ - Tape and Reel |
| MAX16958GEE/V+ | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX16958GEE/V+T | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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