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| 型号： | MAX15059EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX15059 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
76V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
? ? V OUT ?
V REF ?
L MIN [ μ H] =
η × I LIM_LX
Design Procedure
Setting the Output Voltage
Set the MAX15059 output voltage by connecting a resis-
tive divider from the output to FB to SGND (Figure 1).
Select R 1 (FB to SGND resistor) between 5k I and 10k I .
Calculate R 2 (V OUT to FB resistor) using the following
equation:
?
R 2 = R 1 ? ? ? ? 1 ?
? ?
? ? ?
where V OUT can range from (V IN + 5V) to 76V. Apply a
voltage to the CNTRL input to set the feedback set-point
reference voltage, V REF (see the Functional Diagram ).
For V CNTRL > 1.3V, the internal 1.23V (typ) reference
voltage is used as the feedback set point and for V CNTRL
< 1.2V, V REF = V CNTRL . See the Adjusting the Feedback
Set-Point/Reference Voltage section for more information
on adjusting the feedback reference voltage, V REF .
Determining Peak Inductor Current
If the boost converter remains in the discontinuous mode
of operation, then the approximate peak inductor cur-
rent, I LPEAK (in A), is represented by the formula below:
Determining the Inductor Value
Three key inductor parameters must be specified for
operation with the MAX15059: inductance value (L),
inductor saturation current (I SAT ), and DC resistance
(DCR). In general, the inductor should have a saturation
current rating greater than the maximum peak switch
current-limit value (I LIM_LX = 1.3A). DCR should be be
low for reasonable efficiency.
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 dis-
continuous mode operation for supplying full 300mW of
output power:
2 × t S × I OUT × (V OUT ? V IN_MIN )
2
where V IN_MIN , V OUT (both in volts), and I OUT (in amps)
are typical values (so that efficiency is optimum for typi-
cal conditions), t S (in F s) is the period, E is the efficiency,
and I LIM_LX is the peak switch current in amps (see the
Electrical Characteristics table).
Calculate the optimum value of L (L OPTIMUM ) to ensure
the full output power without reaching the boundary
I LPEAK =
2 × t S × (V OUT ? V IN _MIN ) × I OUT_MAX
η× L
between continuous-conduction mode (CCM) and dis-
continuous-conduction mode (DCM) using the following
formula:
L OPTIMUM [ μ H] = MAX
V (V OUT IN_MIN S × η
? V ) × t
where t S is the switching period in Fs, V OUT is the output
voltage in volts, V IN_MIN is the minimum input voltage
in volts, I OUT_MAX is the maximum output current in
amps, L is the inductor value in F H, and E is the effi-
ciency of the boost converter (see the Typical Operating
Characteristics ).
where:
2
L MAX [ μ H] = IN_MIN 2
L [ μ H]
2.25
2 × I OUT × V OUT
MAX15059
FB
R 2
R 1
V OUT
V CNTRL > 1.3V, V FB = 1.23V
V CNTRL < 1.2V, V FB = V CNTRL
For a design in which V IN = 3.3V, V OUT = 70V, I OUT =
3mA, E = 45%, I LIM_LX = 1.2A, and t S = 2.5 F s: L MAX =
27 F H and L MIN = 1.5 F H.
For a worse-case scenario in which V IN = 2.8V, V OUT
= 70V, I OUT = 4mA, η = 43%, I LIM_LX = 1.2A, and t S =
2.5 F s: L MAX = 15 F H and L MIN = 2.2 F H.
The choice of 4.7 F H is reasonable given the worst-case
scenario above. In general, the higher the inductance,
the lower the switching noise. Load regulation is also
better with higher inductance.
Figure 1. Adjustable Output Voltage
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15059EVKIT+ | 功能描述:电源管理IC开发工具 MAX15059 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 |
| MAX15061ATE+ | 功能描述:直流/直流开关转换器 80V 300mW Boost Converter 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 |
| MAX15061ATE+T | 功能描述:直流/直流开关转换器 80V 300mW Boost Converter 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 |
| MAX15062AATA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX15062AATA+T | 功能描述:直流/直流开关调节器 36V 300mA Synchronous 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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