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| 型号： | MAX15034BEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/26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
Hiccup Fault Protection
The MAX15034 includes overload fault protection circuitry
that prevents damage to the power MOSFETs. The fault
protection consists of two digital fault integration blocks
that enable hiccuping under overcurrent conditions. This
circuit works as follows: for every clock cycle the current-
limit threshold is exceeded, the fault integration counter
increments by one count. Thus, if the current-limit condi-
tion persists, the counter reaches its shutdown threshold
in 32,768 counts and shuts down the external MOSFETs.
When the MAX15034 shuts down due to a fault, the
counter begins to count down (since the current-limit con-
dition has ended), once every 16 clock cycles. Thus, the
device counts down for 524,288 clock cycles. At this
point, switching resumes. This produces an effective duty
cycle of 6.25% power-up and 93.75% power-down under
fault conditions. With a switching frequency set to
250kHz, power-up and power-down times are approxi-
mately 131ms and 2.09s, respectively.
Control Loop
The MAX15034 uses an average current-mode control
topology to regulate the output voltage. The control
loop consists of an inner current loop and an outer volt-
age loop. The inner current loop controls the output
current, while the outer voltage loop controls the output
voltage. The inner current loop absorbs the inductor
pole, reducing the order of the outer voltage loop to
that of a single-pole system. Figure 2 is the block dia-
gram of OUT1’s control loop.
The current loop consists of a current-sense resistor,
R SENSE , a current-sense amplifier (CA1), a current-
error amplifier (CEA1), an oscillator providing the carri-
er ramp, and a PWM comparator (CPWM1). The
precision current-sense amplifier (CA1) amplifies the
sense voltage across R SENSE by a factor of 36. The
inverting input to CEA1 senses the output of CA1. The
output of CEA1 is the difference between the voltage-
error amplifier output (EAOUT1) and the gained-up volt-
age from CA1. The RC compensation network
connected to CLP1 provides external frequency com-
pensation for the respective CEA1 (see the
Compensation section). The start of every clock cycle
enables the high-side driver and initiates a PWM on-
cycle. Comparator CPWM1 compares the output volt-
age from CEA1 against a 0 to 2V ramp from the
oscillator. The PWM on-cycle terminates when the ramp
voltage exceeds the error voltage from the current-error
amplifier (CEA1).
CSN1
CSP1
R CF
C CF
CA 1
CLP1
C CFF
V IN
R F
CEA1
CPWM1
DRIVE
I L
R SENSE
V OUT1
VEA1
2V P-P
C OUT
LOAD
R1
V REF = 0.61V
R2
Figure 2. Current and Voltage Loops
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相关代理商/技术参数 |
参数描述 |
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| 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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