- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄43899 > L5973AD (STMICROELECTRONICS) 2.3 A SWITCHING REGULATOR, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | L5973AD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | EXPOSED PAD, HSOP-8 |
| 文件頁數(shù)： | 21/22頁 |
| 文件大?。?/td> | 486K |
| 代理商： | L5973AD |
Functional description
L5973AD
8/22
Doc ID 9552 Rev 9
4.1
Power supply and voltage reference
The internal regulator circuit (shown in Figure 4) consists of a start-up circuit, an internal
voltage pre-regulator, the Bandgap voltage reference and the Bias block that provides
current to all the blocks.
The Starter gives the start-up currents to the whole device when the input voltage goes high
and the device is enabled (inhibit pin connected to ground).
The pre-regulator block supplies the Bandgap cell with a pre-regulated voltage VREG that
has a very low supply voltage noise sensitivity.
4.2
Voltages monitor
An internal block senses continuously the VCC, Vref and Vbg. If the voltages go higher than
their thresholds, the regulator starts to work. There is also an hysteresis on the VCC (UVLO).
Figure 4.
Internal regulator circuit
4.3
Oscillator and synchronization
Figure 5 shows the block diagram of the oscillator circuit.
The clock generator provides the switching frequency of the device that is internally fixed at
500 kHz. The frequency shifter block acts reducing the switching frequency in case of strong
overcurrent or short circuit. The clock signal is then used in the internal logic circuitry and is
the input of the ramp generator and synchronization blocks.
The ramp generator circuit provides the sawtooth signal, used to realize the PWM control
and the internal voltage feed forward, while the Synchronization circuit generates the
synchronization signal. In fact the device has a synchronization pin that can works both as
Master and Slave.
As Master to synchronize external devices to the internal switching frequency.
As Slave to synchronize itself by external signal.
STARTER
IC BIAS
PREREGULATOR
BANDGAP
VREG
VREF
D00IN1126
VCC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5973D | 3.5 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO8 |
| L5973D013TR | 3.5 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO8 |
| L5980TR | 1.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L5983 | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L5983TR | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5973AD_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A switch step down switching regulator |
| L5973AD_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A switch step down switching regulator |
| L5973ADTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.235 to 35V Step-Dn RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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 |
| L5973D | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.235 to 35V Step-Dn 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。