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参数资料
| 型号： | MAX15032EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX15032 |
| 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，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 30V |
| 电流 - 输出： | 20mA |
| 输入电压： | 2.9 ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15032 |
500kHz, 36V Output, 600mW PWM
Step-Up DC-DC Converter
Determining Peak Inductor Current
If the boost converter remains in the discontinuous
mode of operation, then the approximate peak inductor
current, I LPEAK (A), is represented by the formula
Calculate the optimum value of L (L OPTIMUM ) to ensure
the full output power without reaching the boundary
between continuous conduction mode (CCM) and DCM
using the following formula:
below:
I LPEAK =
2 × T S × (V OUT ? V IN _ MIN ) × I OUT
η × L
L OPTIMUM =
L MAX [ μ H]
2 . 25
where:
where T S is the period in μs, V OUT is the output voltage in
volts, V IN_MIN is the minimum input voltage in volts, I OUT
is the output current in amperes, L is the inductor value in
μH, and η is the efficiency of the boost converter.
L MAX [ μ H ] =
V IN _ MIN 2 (V OUT ? V IN _ MIN ) × T S × η
2 × I OUT × V OUT 2
Determining the Inductor Value
Three key inductor parameters must be specified for
operation with the MAX15032: inductance value (L),
inductor saturation current (I SAT ), and DC series resis-
tance (DCR). In general, the inductor should have a
saturation current rating greater than the maximum
switch peak current-limit value (I LIM-LX(MAX) = 1.7A).
DCR should be below 0.1 Ω for reasonable efficiency.
Due to the high switching frequency of the MAX15032,
inductors with a ferrite core or equivalent are recom-
For a design in which V IN = 3.3V, V OUT = 30V,
I OUT = 20mA, η = 0.7, and T S = 2μs, L OPTIMUM =
4.7μH:
L MAX = 10.5μH
and
L MIN = 3.3μH
For a worst-case scenario in which V IN = 2.9V, V OUT =
30V, I OUT = 20mA, η = 0.7, I LIM-LX(MIN) = 1A, and T S =
1.8μs:
mended to minimize core losses. Table 1 shows a list of
vendors with 4.7μH inductor parts.
Table 1. Inductor Vendors
and:
L MAX = 9.2μH
L MIN = 2.2μH
VENDOR
PHONE
FAX
PART NUMBER
OF 4.7μH
INDUCTOR
The choice of 4.7μH is reasonable given the worst-case
scenario above. In general, the higher the inductance,
the lower the switching noise.
TDK
TOKO
Coilcraft
SLF7045T-
408-437-9585 408-437-9591
4R7M2R0-PF
847-297-0070 847-699-7864 636CY-4R7M+P3
800-322-2645 847-639-1469 MOS6020-472MLC
Diode Selection
The MAX15032’s high switching frequency demands a
high-speed rectifier. Schottky diodes are recommend-
ed for most applications because of their fast recovery
time and low forward-voltage drop. Ensure that the
diode’s peak current rating is greater than the inductor
Use the following formula to calculate the lower bound
of the inductor value at different output voltages and
output currents. This is the minimum inductance value
for discontinuous mode operation for supplying the full
600mW output power:
peak current. Also, the diode reverse breakdown volt-
age must be greater than V OUT .
Output Filter Capacitor Selection
For most applications, use a small ceramic surface-mount
output capacitor, 2.2μF or greater. To achieve low output
L MIN [ μ H ] =
2 × T S × I OUT × ( V OUT ?
η × I 2 LIM ? LX
V IN _ MIN )
ripple, a capacitor with low-ESR, low-ESL, and high-
capacitance value should be selected. If tantalum or
electrolytic capacitors are used to achieve high capaci-
where V IN (V), V OUT (V), and I OUT (A) are typical val-
ues, T S (μs) is the period, η is the efficiency, and
I LIM-LX is the peak LX current (A).
tance values, always add a small ceramic in parallel to
bypass the high-frequency components of the diode cur-
rent. The higher ESR and ESL of electrolytic increase both
the output ripple and peak-to-peak transient voltage.
Assuming the contribution from the ESR and capacitor
8
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相关代理商/技术参数 |
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|---|---|
| MAX15032EVKIT+ | 功能描述:电源管理IC开发工具 MAX15032 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 |
| MAX15033AAUI+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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| MAX15033BAUI+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX15034AAUI+ | 功能描述:DC/DC 开关控制器 Configurable Synchronous 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 |
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