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参数资料
| 型号： | L5988D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, HTSSOP-16 |
| 文件页数： | 36/52页 |
| 文件大小： | 1858K |
| 代理商： | L5988D |
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L5988D
Application information
Doc ID 15324 Rev 3
41/52
HS switch delivering an impulsive extra current equal to ILOAD + IRIPPLE - IIN RMS and it is
recharged during the conduction time of the low side by the external power supply.
The golden rule is to reduce as much as possible the stray inductance of the path related to
Figure 25) solves this matter placing the input filter just above the package of the device to
minimize noise. This placement offers the best filtering for the device and minimize the noise
injected by the pulsing current path. The additional stray inductance introduced in the path
from the switching node and the external inductor is not critical for the operation of the
device.
The pin 4 of the L5988D supplies most of the analog circuitry and MOSFET drivers so an
RMS current of few mA flows in its trace. A decoupling path between the power and signal
input reduces the issues induced by the switching noise: an RC network is helpful to filter
the signal supply from the noise generated by the switching activity and it becomes effective
when its time constant is bigger than two or three switching cycles. The pin 4 supplies the
drivers of the embedded MOSFET so the R value has to be kept limited to avoid voltage
spikes during the operation of the embedded driver (the maximum value is in the order of
few ohms).
The inductor current flows from power GND to the output capacitor during the conduction
time of the LS switch: the power ground plane and the signal ground are kept partitioned in
the PCB layout to minimize the injected noise on the signal ground. They are connected
together below the ground of the output capacitor which is the less noisy power component.
The connection of the external resistor divider to the feedback pin (FB) is an high
impedance node, so the interferences can be minimized placing the routing of feedback
node as far as possible from the high current paths. To reduce the pick up noise the resistor
divider has to be placed very close to the device.
Thanks to the exposed pad of the device, the ground plane helps to reduce the thermal
resistance junction to ambient; so a large ground plane enhances the thermal performance
of the converter allowing high power conversion.
Figure 24.
Top board layout
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5988DTR | 功能描述:直流/直流开关调节器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5989D | 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5989DTR | 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5991 | 功能描述:电流型 PWM 控制器 Prog Current Mode 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 |
| L5991_01 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY |
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