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| 型号： | NCP3488DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET DRVR DUAL 12V 8-SOIC |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 2,500 |
| 配置： | 高端和低端，同步 |
| 输入类型： | PWM |
| 延迟时间： | 30ns |
| 配置数： | 1 |
| 输出数： | 2 |
| 高端电压 - 最大（自引导启动）： | 30V |
| 电源电压： | 4.6 V ~ 13.2 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
NCP3488
OD
DRVH
or
DRVL
t pdlOD
90%
Figure 2. Output Disable Timing Diagram
t pdhOD
10%
IN
t pdlDRVL
t fDRVL
DRVL
90%
2V
10%
10%
90%
t pdhDRVH
t rDRVH
t pdlDRVH
t fDRVH
t rDRVL
DRVH ? SW
90%
90%
10%
2V
10%
t pdhDRVL
SW
Figure 3. Nonoverlap Timing Diagram
APPLICATIONS INFORMATION
Theory of Operation
The NCP3488 is a single phase MOSFET driver designed
for driving two N ? channel MOSFETs in a synchronous buck
converter topology. The NCP3488 will operate from 5 V or
12 V, but it has been optimized for high current multi ? phase
buck regulators that convert 12 Volt rail directly to the core
voltage required by complex logic chips. A single PWM input
signal is all that is required to properly drive the high ? side and
the low ? side MOSFETs. Each driver is capable of driving a
3.3 nF load at frequencies up to 500 kHz.
Low ? Side Driver
The low ? side driver is designed to drive a
ground ? referenced low R DS(on) N ? Channel MOSFET. The
voltage rail for the low ? side driver is internally connected to
the V CC supply and PGND.
High ? Side Driver
The high ? side driver is designed to drive a floating low
R DS(on) N ? channel MOSFET. The gate voltage for the high
side driver is developed by a bootstrap circuit referenced to
Switch Node (SW) pin.
The bootstrap circuit is comprised of an external diode,
and an external bootstrap capacitor. When the NCP3488 is
starting up, the SW pin is at ground, so the bootstrap
capacitor will charge up to V CC through the bootstrap diode
See Figure 4. When the PWM input goes high, the high ? side
driver will begin to turn on the high ? side MOSFET using the
stored charge of the bootstrap capacitor. As the high ? side
MOSFET turns on, the SW pin will rise. When the high ? side
MOSFET is fully on, the switch node will be at 12 volts, and
the BST pin will be at 12 volts plus the charge of the
bootstrap capacitor (approaching 24 volts).
The bootstrap capacitor is recharged when the switch
node goes low during the next cycle.
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| NCP348AEMUTBG | 功能描述:监控电路 POSTIVE OVP PRTCTION RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| NCP348GEVB | 功能描述:电源管理IC开发工具 EVALUATION BRD DEV 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 |
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