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| 型号： | MIC261203YJL EV |
| 厂商： | Micrel Inc |
| 文件页数： | 18/31页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MIC261203YJL |
| 标准包装： | 1 |
| 系列： | HyperLight Load®, SuperSwitcher IIG™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 12A |
| 输入电压： | 5.5 ~ 28 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MIC261203 |
| 其它名称： | 576-4014 |
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Micrel, Inc.
MOSFET Gate Drive
The Block Diagram (Figure 1) shows a bootstrap circuit,
consisting of D1 (a Schottky diode is recommended) and
C BST . This circuit supplies energy to the high-side drive
circuit. Capacitor C BST is charged, while the low-side
MOSFET is on, and the voltage on the SW pin is
approximately 0V. When the high-side MOSFET driver is
turned on, energy from C BST is used to turn the MOSFET
on. As the high-side MOSFET turns on, the voltage on
the SW pin increases to approximately V IN . Diode D1 is
reverse biased and C BST floats high while continuing to
keep the high-side MOSFET on. The bias current of the
high-side driver is less than 10mA so a 0.1 μ F to 1 μ F is
sufficient to hold the gate voltage with minimal droop for
the power stroke (high-side switching) cycle, i.e. Δ BST =
10mA x 1.67 μ s/0.1 μ F = 167mV. When the low-side
MOSFET is turned back on, C BST is then recharged
through D1. A small resistor R G , which is in series with
C BST , can be used to slow down the turn-on time of the
high-side N-channel MOSFET.
The drive voltage is derived from the V DD supply voltage.
The nominal low-side gate drive voltage is V DD and the
nominal high-side gate drive voltage is approximately
V DD – V DIODE , where V DIODE is the voltage drop across
D1. An approximate 30ns delay between the high-side
and low-side driver transitions is used to prevent current
from simultaneously flowing unimpeded through both
MOSFETs.
MIC261203
July 2011
18
M9999-071311-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC261203YJLTR | 制造商:Micrel 功能描述:DC DC Regulator 28V 12A 28Pin 5x6mm MLF |
| MIC261203YJL-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 12A 28-PowerVQFN Variant, 28-MLF? 制造商:microchip technology 系列:HyperLight Load?，SuperSwitcher IIG?? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:28V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:5.5V 电流 - 输出:12A 频率 - 开关:600kHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:28-PowerVQFN 变式，28-MLF? 供应商器件封装:28-MLF?（5x6） 标准包装:1 |
| MIC261203-ZAYJL TR | 制造商:Micrel Inc 功能描述:IC REG BUCK SYNC ADJ 12A 28MLF |
| MIC2619YD6 | 制造商:Micrel 功能描述:1.2MHz PWM Boost Converter with OVP |
| MIC2619YD6 TR | 功能描述:直流/直流开关转换器 1.2MHz PWM Boost Converter with OVP in Thin SOT-23 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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