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参数资料
| 型号： | MAX5066EUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 4.75 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Hiccup Fault Protection
The MAX5066 includes overload fault protection circuit-
ry that prevents damage to the power MOSFETs. The
fault protection consists of two digital fault integration
blocks that enable “hiccuping” under overcurrent con-
ditions. 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 condition persists, then the counter
reaches its shutdown threshold in 32,768 counts and
shuts down the external MOSFETs. When the MAX5066
shuts down due to a fault, the counter begins to count
down, (since the current-limit condition 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 approximately
131ms and 2.09s, respectively.
Control Loop
The MAX5066 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
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
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5066EUI+ | 功能描述:DC/DC 开关控制器 Synch Buck Controller 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 |
| MAX5066EUI+T | 功能描述:DC/DC 开关控制器 Synch Buck Controller 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 |
| MAX5066EUI-T | 功能描述:DC/DC 开关控制器 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 |
| MAX5066EVKIT | 功能描述:电源管理IC开发工具 MAX5066 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 |
| MAX5067 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers |
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