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参数资料
| 型号： | MAX8686ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 25A 40TQFN |
| 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 ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz ~ 1MHz |
| 电流 - 输出： | 25A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
f pMOD C ≤ SW
<< f
G EA ( fc ) = g mEA C × zMOD
× R
be less than or equal to 1/5 the switching frequency.
Select a value for f C in the range:
f
5
The error-amplifier gain at f C is:
R C is calculated as:
f
f C
R C = ×
The feedback voltage-divider gain (V REF /V OUT ) should
be included for an output voltage higher than 3.3V,
where V REFIN is equal to 3.3V.
At the crossover frequency, the total loop gain must
V OUT
V FB
f C
g mEA × G MOD ( fc ) × f zMOD
equal 1, and is expressed as:
where g mEA = 1.7mS.
G EA ( fc ) × G MOD ( fc ) × = 1
V REFIN
V OUT
For the case where f zMOD is greater than f C :
G EA ( fc ) = g mEA × R C
C C is calculated from:
C C =
C F is calculated from:
1
2 π × f pMOD × R C
G MOD ( fc ) = G MOD ( dc ) ×
f pMOD
f C
C F =
1
2 π × R C × f zMOD
Then R C can be calculated as:
The current-mode control model on which the above
R C =
g mEA × V REFIN × G MOD ( fc )
V OUT
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
where g mEA = 1.7mS.
The error-amplifier compensation zero formed by R C
and C C should be set at the modulator pole f PMOD .
Calculate the value of C C as follows:
to estimate the phase margin obtainable by the selected
compensation components. As a final step, it is useful to
plot the dB gain and phase of the following loop-gain
transfer function and check the obtained phase margin. A
phase margin of at least 45° is recommended:
? 1 +
× ?? ( Ks × ( 1 ? D ) ) ? 0 . 5 ?? ?
C C =
1
2 π × f pMOD × R C
G LOOP ( s ) =
?
?
L × f SW ?
R LOAD × g MC
R LOAD ?
×
( 1 + s / 2 π × f zMOD )
( 1 + s / 2 π × f pMOD )
×
× mEA
If f PMOD is less than 5 x f C , add a second capacitor C F
from COMP to GND. The value of C F is:
( 1 + s / 2 π × f zEA )
( 1 + s / 2 π × f pEA ) × ( 1 + s / 2 π × f pdEA )
g
× Ro × V REFIN
V OUT
G S (
C F =
? 1 +
?
?
( π × f SW ) ?
1
2 π × R C × f zMOD
As the load current decreases, the modulator pole also
decreases; however, the modulator gain increases
G S ( s ) =
?
?
?
1
s
π × Q c × f SW
+
s 2
2 ?
accordingly and the crossover frequency remains the
where the sampling effect quality factor is:
same.
For the case where f zMOD is less than f C :
The power modulator gain at f C is:
f pMOD
G MOD ( fc ) = G MOD ( dc ) ×
f zMOD
Q C =
1
[ π × ( K S × ( 1 ? D ) ? 0 . 5 ) ]
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8686EVKIT# | 功能描述:电源管理IC开发工具 MAX8686 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 |
| MAX8686EVKIT+ | 功能描述:电源管理IC开发工具 MAX8686 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 |
| MAX8687ETL+ | 制造商:Maxim Integrated Products 功能描述:SINGLE /MULTIPHASE, DC/DC CONVERTER - Rail/Tube |
| MAX8688AHETG+ | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688AHETG+T | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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