- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367416 > L5973D (意法半導(dǎo)體) RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS PDF資料下載
參數(shù)資料
| 型號(hào)： | L5973D |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 166K |
| 代理商： | L5973D |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)當(dāng)前第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)
7/13
L5973AD
compensation network.
The uncompensated error amplifier has the following characteristics:
The error amplifier output is compared with the oscillator sawtooth to perform PWM control.
PWM COMPARATOR AND POWER STAGE
This block compares the oscillator sawtooth and the error amplifier output signals generating the PWM
signal for the driving stage.
The power stage is a very critical block cause it has to guarantee a correct turn on and turn off of the PD-
MOS.
The turn on of the power element, or better, the rise time of the current at turn on, is a very critical param-
eter to compromise.
At a first approach, it looks like the faster it is the rise time, the lower are the turn on losses.
But there is a limit introduced by the recovery time of the recirculation diode.
In fact when the current of the power element equals the inductor current, the diode turns off and the drain
of the power is free to go high. But during its recovery time, the diode can be considered as an high value
capacitor and this produces a very high peak current, responsible of many problems:
Spikes on the device supply voltage that cause oscillations (and thus noise) due to the board parasitics.
Turn on overcurrent causing a decrease of the efficiency and system reliability.
Big EMI problems.
Shorter freewheeling diode life.
The fall time of the current during the turn off is also critical. In fact it produces voltage spikes (due to the
parasitics elements of the board) that increase the voltage drop across the PDMOS.
In order to minimize all these problems, a new topology of driving circuit has been used and its block dia-
gram is shown in fig. 5.
The basic idea is to change the current levels used to turn on and off the power switch, according with the
PDMOS status and with the gate clamp status.
This circuitry allow to turn off and on quickly the power switch and to manage the above question related
to the freewheeling diode recovery time problem. The gate clamp is necessary to avoid that Vgs of the
internal switch goes higher than Vgsmax. The ON/OFF Control block avoids any cross conduction be-
tween the supply line and ground.
Transconductance
2300
μ
S
Low frequency gain
65dB
Minimum sink/source voltage
1500
μ
A/300
μ
A
Output voltage swing
0.4V/3.65V
Input bias current
2.5
μ
A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5994A | ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994 | ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5995 | Current-Mode SMPS Controller |
| L6116LDC25 | x8 SRAM |
| L6116LDC35 | x8 SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5973D_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2.5 A switch step down switching regulator?癎 |
| L5973D013TR | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5 A Step-DN Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5974AD | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5974ADTR | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5974D | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2.5A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。