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参数资料
| 型号： | MAX5974AEVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/27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
n-Channel MOSFET Gate Driver
The NDRV output drives an external n-channel MOSFET.
NDRV can source/sink in excess of 650mA/1000mA
peak current; therefore, select a MOSFET that yields
acceptable conduction and switching losses. The exter-
nal MOSFET used must be able to withstand the maxi-
mum clamp voltage.
Dead Time
Dead time between the main and AUX output edges allow
ZVS to occur, minimizing conduction losses and improv-
ing efficiency. The dead time (t DT ) is applied to both
leading and trailing edges of the main and AUX outputs
as shown in Figure 5. Connect a resistor between DT and
GND to set t DT to any value between 40ns and 400ns:
p-Channel MOSFET Gate Driver
The AUXDRV output drives an external p-channel
MOSFET with the aid of a level shifter. The level shifter
R DT
=
10k ?
40ns
× t DT
consists of C AUX , R AUX , and D5 as shown in the Typical
Application Circuits . When AUXDRV is high, C AUX is
recharged through D5. When AUXDRV is low, the gate
of the p-channel MOSFET is pulled below the source by
the voltage stored on C AUX , turning on the pFET.
Add a zener diode between gate to source of the exter-
nal n-channel and p-channel MOSFETs after the gate
Oscillator/Switching Frequency
The ICs’ switching frequency is programmable between
100kHz and 600kHz with a resistor R RT connected
between RT and GND. Use the following formula to
determine the appropriate value of R RT needed to gen-
erate the desired output-switching frequency (f SW ):
resistors to protect V GS from rising above its absolute
maximum rating during transient condition (see the
Typical Application Circuits ).
R RT =
8.7 × 10 9
f SW
where f SW is the desired switching frequency.
BLANKING, t BLK
NDRV
AUXDRV
DEAD TIME, t DT
Figure 5. Dead Time Between AUXDRV and NDRV
18
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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