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參數(shù)資料
| 型號： | L5980 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 0.7A step-down switching regulator |
| 中文描述： | 0.7A的降壓開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 7/37頁 |
| 文件大小： | 959K |
| 代理商： | L5980 |
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Functional description
L5980
7/37
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Functional description
The L5980 is based on a “voltage mode”, constant frequency control. The output voltage
V
OUT
is sensed by the feedback pin (FB) compared to an internal reference (0.6V) providing
an error signal that, compared to a fixed frequency sawtooth, controls the on and off time of
the power switch.
The main internal blocks are shown in the block diagram in
Figure 3
. They are:
A fully integrated oscillator that provides sawtooth to modulate the duty cycle and the
synchronization signal. Its switching frequency can be adjusted by and external
resistor. The voltage and frequency feed forward are implemented.
The soft start circuitry to limit inrush current during the start up phase.
The voltage mode Error Amplifier
The Pulse Width Modulator and the relative logic circuitry necessary to drive the
internal power switch.
The High-side driver for embedded p-channel power MOSFET switch.
The peak current limit sensing block, to handle over load and short circuit conditions.
A voltage regulator and internal reference. It supplies internal circuitry and provides a
fixed internal reference.
A voltage monitor circuitry (UVLO) that checks the input and internal voltages.
A thermal shutdown block, to prevent thermal run away.
z
z
z
z
z
z
z
z
z
Figure 3.
Block diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5980TR | 0.7A step-down switching regulator |
| L5985 | 2A step-down switching regulator |
| L5985TR | 2A step-down switching regulator |
| L5991 | PRIMARY CONTROLLER WITH STANDBY |
| L5991A | PRIMARY CONTROLLER WITH STANDBY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5980_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:0.7 A step-down switching regulator |
| L5980TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 700mA Step-Down Switching Reg 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 |
| L5980TR-CUT TAPE | 制造商:ST 功能描述:L5980 Series 15 V 250 kHz 0.7 A Step Down Switching Regulator - VFQFPN-8 |
| L5981 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1A STEP-DOWN SWITCH REG 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 |
| L5981_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 A step-down switching regulator |
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