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| 型号： | MAX8655ETN+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 25A 56TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 4.5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 25A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 56-TQFN-EP（8x8） |
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
G EA ( fc ) = g mEA C × zMOD
× R
f pMOD << f C ≤ S
The crossover frequency, f C , should be much higher
than the power-modulator pole f pMOD . Also, f C should
be less than or equal to 1/5 the switching frequency.
Select a value for f C in the range:
f
5
At the crossover frequency, the total loop gain must
equal 1, and is expressed as:
The error-amplifier gain at f C is:
f
f C
Figure 11 is the simplified gain plot for the f zMOD < f C
case.
G EA ( fc ) × G MOD ( fc ) ×
V FB
V OUT
= 1
GAIN
(dB)
CLOSED LOOP
POWER
For the case where f zMOD is greater than f C :
G EA ( fc ) = g mEA × R C
MODULATOR
ERROR
AMPLIFIER
G MOD ( fc ) = G MOD ( dc ) ×
f pMOD
f C
0dB
FB
DIVIDER
f pMOD
f zMOD
fc
FREQUENCY
Then R C can be calculated as:
R C =
V OUT
g mEA × V FB × G MOD ( fc )
Figure 11. Simplified Gain Plot for the fzMOD < fC Case
R C is calculated as:
R C = ×
where g mEA = 110μS.
The error-amplifier compensation zero formed by R C
and C C should be set at the modulator pole f PMOD .
V OUT
V FB
f C
g mEA × G MOD ( fc ) × f zMOD
Calculate the value of C C as follows:
where g mEA = 110μS.
C C =
C C =
2 π × f p
1
2 π × f pMOD × R C
If f zMOD is less than 5 x f C , add a second capacitor C F
from COMP to GND. The value of C F is:
C C is calculated from:
C F is calculated from:
1
MOD
× R C
C F =
1
2 π × R C × f zMOD
C F =
1
2 π × R C × f zMOD
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:
The current-mode control model on which the above
design procedure is based requires an additional high-
frequency term, G S (s), to account for the effect of sam-
pling the peak inductor current. The term G S (s)
produces additional phase lag at crossover and should
be modeled to estimate the phase margin obtainable
by the selected compensation components. As a final
G MOD ( fc ) = G MOD ( dc ) ×
f pMOD
f zMOD
step, it is useful to plot the dB gain and phase of the
following loop-gain transfer function and check the
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相关代理商/技术参数 |
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|---|---|
| MAX8655EVKIT+ | 功能描述:电源管理IC开发工具 MAX8655/88 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 |
| MAX8657 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8658 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8659 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8659ETL+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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