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參數(shù)資料
| 型號： | L5989D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | ROHS COMPLIANT, HTSSOP-16 |
| 文件頁數(shù)： | 33/51頁 |
| 文件大小： | 1947K |
| 代理商： | L5989D |
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L5989D
Application information
Doc ID 15778 Rev 3
39/51
The characterization of the thermal impedance is strictly dependent on the layout of the
board. In Figure 22. the measurement of the thermal impedance of the evaluation board of
the L5989D is provided.
Figure 22.
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 L5989D 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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| L5991 | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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| L5991A | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L5991AD | 功能描述:開關變換器、穩(wěn)壓器與控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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