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参数资料
| 型号： | MAX5974AEVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX5974A |
| 标准包装： | 1 |
| 系列： | * |
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MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
V = R EN1 ×
V S(UVLO)
V EN(MAX)
EN2
V S(MAX) ×
R EN
UVLO on Power Source
The enable input has an accurate threshold of 1.26V
(max). For applications that require a UVLO on the
power source, connect a resistive divider from the power
source to EN to GND as shown in Figure 1. A zener
diode between IN and GND is required to prevent the
NDRV and AUXDRV gate-drive voltages from exceeding
20V, the maximum allowed gate voltage of power FETs.
The external zener diode should clamp in the following
range:
20V > V Z > V UVLO(MAX)
where V Z is the zener voltage and V UVLO(MAX) is the
maximum wakeup level (16.5V or 8.85V depending on
the device version). An 18V zener diode is the best
choice.
Design the resistive divider by first selecting the value of
R EN1 to be on the order of 100kω. Then calculate R EN2
as follows:
V EN(MAX)
_
where V EN(MAX) is the maximum enable threshold volt-
age and is equal to 1.26V and V S(UVLO) is the desired
UVLO threshold for the power source, below which the
device is disabled.
The digital output connected to EN should be capable
of withstanding more than the maximum supply voltage.
MCU Control of Enable Input
When using a microcontroller GPIO to control the enable
input, an 18V zener diode is required on IN as shown in
Figure 2.
High-Voltage Logic Control of Enable Input
In the case where EN is externally controlled by a high-
voltage open-drain/collector output (e.g., PGOOD indi-
cator of a powered device controller), connect IN to EN
through a resistor R EN and connect EN to an open-drain
or open-collector output as shown in Figure 3. Select
R EN such that the voltage at IN, when EN is low, is less
than 20V (i.e., the maximum gate voltage of the main and
AUX FETs):
< 20V
R EN + R IN
where V S(MAX) is the maximum supply voltage. Obeying
this relationship eliminates the need for an external zener
diode.
The digital output connected to EN should be capable of
withstanding more than 20V.
V S
V S
R IN
IN
R IN
IN
R EN1
18V
C IN
MAX5974
18V
C IN
MAX5974_
DIGITAL
MCU
CONTROL
N
R EN2
EN
I/O
EN
Figure 1. Programmable UVLO for the Power Source
16
Figure 2. MCU Control of the Enable Input
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5974AEVKIT# | 功能描述:电源管理IC开发工具 MAX5974A 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 |
| MAX5974BETE+ | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5974BETE+T | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5974CETE+ | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5974CETE+T | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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