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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： | 35/52页 |
| 文件大小： | 1858K |
| 代理商： | L5988D |
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Application information
L5988D
40/52
Doc ID 15324 Rev 3
The characterization of the thermal impedance is strictly dependent on the layout of the
board. In Figure 23. the measurement of the thermal impedance of the evaluation board of
the L5988D is provided.
Figure 23.
Measurement of the thermal impedance of the evaluation board
As it can be see, for example, for load pulses with duration of 1 second, the actual thermal
impedance is lower than 20
°C/W. This means that, for short pulses, a current higher that 5A
(provided the current limitation is set correctly) can be managed.
6.7
Layout considerations
The PC board layout of switching DC/DC regulator is very important to minimize the noise
injected in high impedance nodes and interferences generated by the high switching current
loops. The L5988D is a monolithic device so most of the critical path are designed internally
minimizing the potential issues introduced by the board layout.
In the operation of a step down converter two high current loops become evident and
critical. The conduction of the high side switch highlight a current loop composed by the
input capacitor, the inductor and the output capacitor whilst during the conduction of the low
side switch the current flows from the power ground to the inductor and again the output
capacitor.
The first consideration is to keep the trace of the switching node as short as possible to
reduce radiated emission.
The bandwidth of the external power supply is limited if compared to the switching frequency
of the device so the power supply delivers a certain RMS current in the switching period. As
a consequence the input filter substains the input voltage during the conduction time of the
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相关代理商/技术参数 |
参数描述 |
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| 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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