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| 型号： | MAX15015AEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX15015A |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 3.3V，5V |
| 电流 - 输出： | 1A，50mA |
| 输入电压： | 4.5 ~ 40 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15015A |
1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
ESR =
? V ESR
I OUT _ MAX +
? I P ? P
2
tance, its ESR, and its equivalent series inductance
(ESL). The output capacitor supplies the load current
during a load step until the controller responds with a
greater duty cycle. The response time (t RESPONSE )
C IN =
I OUT _ MAX × D
? V Q × f SW
depends on the closed-loop bandwidth of the converter
(see the Compensation Design section). The resistive
drop across the output capacitor ’s ESR, the drop
where C IN is the sum of C DRAIN and additional decou-
pling capacitance at the buck converter input,
across the capacitor’s ESL ( ? V ESL ), and the capacitor
discharge causes a voltage droop during the loadstep.
Use a combination of low-ESR tantalum/aluminum elec-
? I P ? P =
( V IN ? V OUT ) × V OUT
V IN × f SW × L
and
trolytic and ceramic capacitors for better transient load
and voltage ripple performance. Non-leaded capaci-
tors and capacitors in parallel help reduce the ESL.
D = OUT
V
V IN
I OUT_MAX is the maximum output current, D is the duty
cycle, and f SW is the switching frequency.
Keep the maximum output voltage deviation below the
tolerable limits of the electronics being powered. Use
the following equations to calculate the required ESR,
ESL, and capacitance value during a load step:
The MAX15014–MAX15017 include UVLO hysteresis
and soft-start to avoid chattering during turn-on.
ESR =
? V ESR
I STEP
C OUT = STEP RESPONSE
? V ESL × t STEP
However, use additional bulk capacitance if the input
source impedance is high. Use enough input capaci-
tance at lower input voltages to avoid possible under-
shoot below the undervoltage lockout threshold during
transient loading.
ESL =
I × t
? V Q
I STEP
Output-Capacitor Selection
The allowable output voltage ripple and the maximum
deviation of the output voltage during load steps deter-
t RESPONSE ?
1
3 ? C
mine the output capacitance (C OUT ) and its equivalent
series resistance (ESR). The output ripple is mainly
composed of ? V Q (caused by the capacitor discharge)
and ? V ESR (caused by the voltage drop across the ESR
of the output capacitor). The equations for calculating
the peak-to-peak output voltage ripple are:
where I STEP is the load step, t STEP is the rise time of the
load step, t RESPONSE is the response time of the con-
troller and f C is the closed-loop crossover frequency.
Compensation Design
The MAX15014–MAX15017 use a voltage-mode control
scheme that regulates the output voltage by comparing
? V Q =
? I P ? P
8 × C OUT × f SW
the error amplifier output (COMP) with an internal ramp
to produce the required duty cycle. The output lowpass
LC filter creates a double pole at the resonant frequency,
? V ESR = ESR × ? I P ? P
Normally, a good approximation of the output voltage rip-
ple is ? V RIPPLE = ? V ESR + ? V Q . If using ceramic capaci-
tors, assume the contribution to the output voltage ripple
from ESR and the capacitor discharge to be equal to 20%
and 80%, respectively. ? I P-P is the peak-to-peak inductor
current (see the Input-Capacitor Selection section) and
f SW is the converter’s switching frequency.
The allowable deviation of the output voltage during
fast load transients also determines the output capaci-
which has a gain drop of -40dB/decade. The error
amplifier must compensate for this gain drop and
phase shift to achieve a stable closed-loop system.
The basic regulator loop consists of a power modulator,
an output feedback divider, and a voltage error amplifier.
The power modulator has a DC gain set by V IN /
V RAMP , with a double pole and a single zero set by the
output inductance (L), the output capacitance (C OUT ),
and its ESR. The power modulator incorporates a voltage
feed-forward feature, which automatically adjusts for vari-
ations in the input voltage resulting in a DC gain of 10.
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15015AEVKIT+ | 功能描述:电源管理IC开发工具 MAX15015A 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 |
| MAX15015BATX+ | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX15015BATX+T | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX15015EVKIT | 功能描述:电源管理IC开发工具 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 |
| MAX15016AATX+ | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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