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参数资料
| 型号： | MAX15002ATL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-TQFNEP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2.2MHz |
| 电源电压： | 5.5 V ~ 23 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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MAX15002
Dual-Output Buck Controller with
Tracking/Sequencing
Type III: Compensation when f CO < f ESR
As indicated above, the position of the output capaci-
tor’s inherent ESR zero is critical in designing an appro-
priate compensation network. When low-ESR ceramic
output capacitors are used, the ESR zero frequency
(f ESR ) is usually much higher than unity crossover fre-
Two midband zeros (f Z1 and f Z2 ) are designed to can-
cel the pair of complex poles introduced by the LC filter.
f P1 = at the origin (0Hz)
f P1 introduces a pole at zero frequency (integrator) for
nulling DC output-voltage errors.
quency (f CO ). In this case, a Type III compensation net-
work is recommended (see Figure 7a).
f P 2 =
1
2 π × R I × C I
V OUT
C CF
Depending on the location of the ESR zero (f ESR ), f P2
can be used to cancel it, or to provide additional atten-
R I
R 1
R F
C F
uation of the high-frequency output ripple.
C I
R 2
FB
V REF
-
g m
+
COMP
f P 3 =
1
2 π × R F × ( C F || C CF )
=
2 π × R F ×
1
C F × C CF
C F + C CF
f P3 attenuates the high-frequency output ripple.
The locations of the zeros and poles should be such
Figure 7a. Type III Compensation Network
GAIN
that the phase margin peaks around f CO .
Set the ratios of f CO -to-f Z and f P -to-f CO equal to one
another, e.g., f CO = f P = 5 is a good number to get about
(dB)
f Z
f CO
60° of phase margin at f CO . Whichever technique, it is
4TH ASYMPTOTE
R F R I
important to place the two zeros at or below the double
pole to avoid the conditional stability issue.
f CO ≤ SW
3RD ASYMPTOTE
ω R F C I
1ST ASYMPTOTE
ω R I C F-1
2ND ASYMPTOTE
R F R I-1
5TH ASYMPTOTE
ω R I C CF-1
The following procedure is recommended:
1) Select a crossover frequency, f CO , at or below one-
tenth the switching frequency:
f
10
1ST POLE
(AT ORIGIN)
1ST ZERO
R F C F
2ND POLE
R I C I
3RD POLE ω (rad/sec)
R F C CF
2) Calculate the LC double-pole frequency, f LC :
2ND ZERO
R I C I
Figure 7b. Type III Compensation Network Response
f LC =
1
2 π× L × COUT
As shown in Figure 7b, the Type III compensation net-
work introduces two zeros and three poles into the con-
trol loop. The error amplifier has a low-frequency pole
at the origin, two zeros, and two higher frequency poles
3) Select R F ≥ 10k ? .
4) Place compensator ’s first zero f Z 1 =
at or below the output filter ’s
double pole, f LC , as follows:
1
2 π × R F × C F
f Z 1 =
at the following frequencies:
1
2 π × R F × C F
C F =
1
2 π × R F × 0 . 5 × f LC
22
f Z 2 =
1
2 π × C I × ( R 1 + R I )
Maxim Integrated
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相关代理商/技术参数 |
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|---|---|
| MAX15002ATL+ | 功能描述:DC/DC 开关控制器 Dual-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15002ATL+T | 功能描述:DC/DC 开关控制器 Dual-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15003ATM+ | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15003ATM+T | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15003EVKIT+ | 功能描述:电源管理IC开发工具 MAX15003 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 |
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