- 您现在的位置：买卖IC网 > PDF目录17278 > MAX15021EVKIT+ (Maxim Integrated Products)BOARD EVAL FOR MAX15021 PDF资料下载
参数资料
| 型号： | MAX15021EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MAX15021 |
| 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： | 0.6 V ~ 5.5 V |
| 电流 - 输出： | 4A，2A |
| 输入电压： | 2.5 V ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15021 |
MAX15021
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
Below are equations that define the power modulator:
use aluminum electrolytic capacitors while for space-
sensitive applications, use low-ESR tantalum or multilay-
= = 4V/V
Gain MOD(DC) =
V AVIN
V RAMP
V AVIN
V AVIN
4
er ceramic chip (MLCC) capacitors at the output. The
higher switching frequencies of the MAX15021 allow the
use of MLCC as the primary filter capacitor(s).
2 π × L × C OUT × ? OUT
? R OUT + DCR ?
f LC =
1
? R + ESR ?
?
≈
1
2 π × L × C OUT
First, select the passive and active power components
that meet the application output ripple, component
size, and component cost requirements. Second,
choose the small-signal compensation components to
f ESR =
1
2 π × ESR × C OUT
achieve the desired closed-loop frequency response
and phase margin as outlined below.
Closed-Loop Response and Compensation
R OUT is the load resistance of the regulator, f LC is the
resonant break frequency of the filter, and f ESR is the
ESR zero of the output capacitor. See the Closed-Loop
Response and Compensation of Voltage-Mode
Regulators section for more information on f LC and f ESR .
The switching frequency (f SW ) is programmable
between 500kHz and 4MHz. Typically, the crossover
frequency (f CO )—the frequency at which the system’s
closed-loop gain is equal to unity (crosses 0dB) —
should be set at or below one-tenth the switching fre-
quency (f SW /10) for stable closed-loop response.
The MAX15021 provides an internal voltage-mode error
amplifier with its inverting input and its output available to
the user for external frequency compensation. The flexi-
bility of external compensation for each controller offers
a wide selection of output filtering components, especial-
ly the output capacitor. For cost-sensitive applications,
of Voltage-Mode Regulators
The power modulator’s LC lowpass filter exhibits a vari-
ety of responses, dependent on the value of the L and
C and their parasitics. Higher resistive parasitics
reduce the Q of the circuit, reducing the peak gain and
phase of the system; however, efficiency is also
reduced under these circumstances.
One such response is shown in Figure 4a. In this exam-
ple, the ESR zero occurs relatively close to the filter’s
resonant break frequency, f LC . As a result, the power
modulator’s uncompensated crossover is approximate-
ly one-third the desired crossover frequency, f CO . Note
also, the uncompensated rolloff through the 0dB plane
follows a single-pole, -20dB/decade slope, and 90° of
phase lag. In this instance, the inherent phase margin
ensures a stable system; however, the gain-bandwidth
product is not optimized.
40
20
f LC
MAX15021 fig04a
90
45
80
60
< G EA
MAX15021 fig04b
180
135
0
|G MOD | ASYMPTOTE
|G MOD |
0
40
20
|G EA |
f LC
f CO
90
45
-20
< G MOD
f ESR
-45
0
0
-40
-60
-80
-90
-135
-180
-20
-40
-60
-80
< G MOD
f ESR
|G MOD |
-45
-90
-135
-180
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 4a. Power Modulator Gain and Phase Response with
Lossy Bulk Output Capacitor(s) (Aluminum)
Maxim Integrated
FREQUENCY (Hz)
Figure 4b. Power Modulator and Type II Compensator Gain and
Phase Response with Lossy Bulk Output Capacitor(s) (Aluminum)
15
相关PDF资料 |
PDF描述 |
|---|---|
| 050R24-102B | CABLE FLAT FLEX 24POS 0.5MM 4" |
| GCC17DCMD | CONN EDGECARD 34POS .100" WW |
| AIRD-06-222K | INDUCTOR 2200UH 0.8A 10% |
| ECC08DRYI | CONN EDGECARD 16POS DIP .100 SLD |
| 591D157X0010C2T20H | CAP TANT 150UF 10V 20% 2812 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15021EVKIT+ | 功能描述:电源管理IC开发工具 MAX15021 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 |
| MAX15022ATI+ | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Dual LDO Ctlr 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 |
| MAX15022ATI+T | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Dual LDO Ctlr 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 |
| MAX15022EVKIT+ | 功能描述:电源管理IC开发工具 MAX15022 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 |
| MAX15023ETG/V+ | 功能描述:DC/DC 开关控制器 4.5-28V Input Dual Out Synch Buck 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 |
发布紧急采购，3分钟左右您将得到回复。