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| 型号： | MAX15034BEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/26页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX15034 |
| 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，步降 |
| 输入电压： | 5 ~ 28 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： | MAX15034 |
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Reverse Current Limit
The MAX15034 limits the reverse current when the out-
put capacitor voltage is higher than the preset output
voltage. Calculate the maximum reverse current limit
based on V CLMP_LO and the current-sense resistor
R SENSE .
1) The average current tracks the programmed cur-
rent with a high degree of accuracy.
2) Slope compensation is not required, but there is a
limit to the loop gain at the switching frequency to
achieve stability.
3) Noise immunity is excellent.
I REVERSE =
1 . 55 × 10 ? 3
R SENSE
4) The average current-mode method can be used to
sense and control the current in any circuit branch.
For stability of the current loop, the amplified inductor-
Output-Voltage Setting
The output voltage is set by the combination of resistors
R1, R2, and R F as described in the Voltage-Error
Amplifier section. First select a value for resistor R2. Then
calculate the value of R1 from the following equation:
current downslope at the negative input of the PWM
comparator (CPWM1 and CPWM2) must not exceed
the ramp slope at the comparator’s positive input. This
puts an upper limit on the current-error amplifier gain at
the switching frequency. The inductor current downs-
lope is given by V OUT /L where L is the value of the
R 1 =
( V OUT ( NL ) ? 0 . 6125 )
0 . 6125
× R 2
inductor (L1 and L2 in Figure 6) and V OUT is the output
voltage. The amplified inductor current downslope at
the negative input of the PWM comparator is given by:
= × R SENSE × 36 × g m × R CF
where V OUT(NL) is the voltage at no load. Then find the
value of R F from the following equation:
? V L
? t
V OUT
L
R F = OUT SENSE
I × R × 36 × R 1
? V OUT
where ? V OUT is the allowable drop in voltage from no
load to full load. R F is R8 and R9, R1 is R4 and R6, R2
is R5 and R7 in Figure 6.
where R SENSE is the current-sense resistor (R1 and R2
in Figure 6) and g M x R CF is the gain of the current-error
amplifier (CEA_) at the switching frequency. The slope
of the ramp at the positive input of the PWM comparator
is 2V x f SW . Use the following equation to calculate the
maximum value of R CF (R14 or R15 in Figure 6).
Compensation
The MAX15034 uses an average current-mode control
scheme to regulate the output voltage (see Figure 2).
R CF ≤
2 × f SW × L
V OUT × R SENSE × 36 × g m
( 1 )
The main control loop consists of an inner current loop
f CMAX = SW IN
f SW = CMAX OUT
and an outer voltage loop. The voltage error amplifier
(VEA1 and VEA2) provides the controlling voltage for
the current loop in each phase. The output inductor is
hidden inside the inner current loop. This simplifies the
design of the outer voltage control loop and also
improves the power-supply dynamics. The objective of
the inner current loop is to control the average inductor
current. The gain-bandwidth characteristic of the cur-
rent loop can be tailored for optimum performance by
the compensation network at the output of the current-
error amplifier (CEA1 or CEA2). Compared with peak
current-mode control, the current-loop gain crossover
The highest crossover frequency f CMAX is given by:
f × V
2 π × V OUT
or alternatively:
f × 2 π × V
V IN
Equation (1) can now be rewritten as:
frequency, f C , can be made approximately the same,
but the gain at low frequencies is much higher. This
results in the following advantages over peak current-
mode control.
R CF =
π × f C × L
V IN × R S × 9 × g m
( 2 )
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15034BEVKIT+ | 功能描述:电源管理IC开发工具 MAX15034B 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 |
| MAX15035ETL+ | 功能描述:电压模式 PWM 控制器 15A Step-Down Reg w/Internal Switch RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX15035ETL+T | 功能描述:电压模式 PWM 控制器 15A Step-Down Reg w/Internal Switch RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX15035EVKIT+ | 功能描述:电源管理IC开发工具 MAX15035 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 |
| MAX15036ATE/V+ | 功能描述:直流/直流开关转换器 2.2MHz 3A Buck wInt High-Side Switch 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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