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| 型号： | MAX15118EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT STEP-DOWN 18A MAX15118 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 27W |
| 输出电压： | 1.5V |
| 电流 - 输出： | 18A |
| 输入电压： | 2.7 V ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15118 |
MAX15118
High-Efficiency, 18A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
1 + LOAD S
L × f SW
R1 + R2
= × ?
R C
? ?
× 2 π × f CO × C OUT × ? ESR +
?
? 1 K S [(1- D) - 0.5] ?
? ?
K S = 1 + SLOPE SW MC
Figure 3 shows a graphical representation of the asymp-
totic system closed-loop response, including the domi-
nant pole and zero locations.
is the one of interest in establishing the desired crossover
frequency (and determining the compensation compo-
nent values). A lower crossover frequency provides for
stable closed-loop operation at the expense of a slower
load and line-transient response. Increasing the cross-
over frequency improves the transient response at the
(potential) cost of system instability. A standard rule of
thumb sets the crossover frequency P 1/5 to 1/10 of the
switching frequency.
Closing the Loop: Designing
the Compensation Circuitry
1) Select the desired crossover frequency. Choose f CO
equal to 1/10th of f SW , or f CO @ 100kHz.
2) Select R C using the transfer-loop’s fourth asymptote
gain equal to unity (assuming f CO > f P1 , f P2 , and f Z1 ).
R C becomes:
? R × K [(1- D) - 0.5] ?
? ?
?
R2 g M × g MC × R LOAD
? ?
1
+
? R LOAD L × f SW ?
where K S is calculated as:
V × f × L × g
V IN - V OUT
and g M = 1.2mS, g MC = 150A/V, and V SLOPE = 130mV.
dB
1ST ASYMPTOTE
R2 x (R1 + R2) -1 x 10 AVEA(dB)/20 x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
2ND ASYMPTOTE
R2 x (R1 + R2) -1 x g M x (2 G C C ) -1 x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
GAIN
3RD ASYMPTOTE
R2 x (R1 + R2) -1 x g M x (2 G C C ) -1 x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
x (2 G C OUT x {R LOAD-1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 ) -1
4TH ASYMPTOTE
R2 x (R1 + R2) -1 x g M x R C x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
x (2 G C OUT x {R LOAD-1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 ) -1
3RD POLE
0.5 x f SW
2ND ZERO
(2 G C OUT ESR) -1
UNITY
1ST POLE
[2 G C C (10 AVEA(dB)/20
x g M -1 )] -1
1ST ZERO
(2 G C C R C ) -1
f CO
FREQUENCY
2ND POLE
f PMOD *
NOTE:
R OUT = 10 AVEA(dB)/20 x g M -1
*f PMOD = [2 G C OUT x (ESR + {R LOAD -1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 )] -1
WHICH FOR
ESR << {R LOAD -1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1
BECOMES
5TH ASYMPTOTE
R2 x (R1 + R2) -1 x g M x R C x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
x [(2 G C OUT x {R LOAD-1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 ) -1 x (0.5 x f SW )2 x (2 G f) -2
6TH ASYMPTOTE
R2 x (R1 + R2) -1 x g M x R C x g MC x R LOAD x {1 + R LOAD x [K S x (1 – D) – 0.5] x (L x f SW ) -1 } -1
x ESR x {R LOAD-1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 x (0.5 f SW ) 2 x (2 G f) -2
f PMOD = [2 G C OUT x {R LOAD -1 + [K S (1 – D) – 0.5] x (L x f SW ) -1 } -1 ] -1
f PMOD = (2 G C OUT x R LOAD ) -1 + [K S (1 – D) – 0.5] x (2 G C OUT x L x f SW ) -1
Figure 3. Asymptotic Loop Response of Peak Current-Mode Regulator
???????????????????????????????????????????????????????????????? Maxim Integrated Products 19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15118EVKIT# | 功能描述:电源管理IC开发工具 MAX15118 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 |
| MAX15118EVKIT+ | 功能描述:电流型 PWM 控制器 18A Buck Converter w/ Integrated Switches 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 |
| MAX15118EWI+ | 功能描述:电流型 PWM 控制器 18A w/Internal Switch 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 |
| MAX15118EWI+T | 功能描述:电流型 PWM 控制器 18A w/Internal Switch 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 |
| MAX15119GTM+ | 功能描述:直流/直流开关调节器 Rev 5 of the MAX17411 for Apple 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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