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參數(shù)資料
| 型號： | L6911ETR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 2/34頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6911ETR |
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Device description
L6911E
10/34
5
Device description
The device is an integrated circuit realized in BCD technology. It provides complete control
logic and protections for a high performance step-down DC-DC converter optimized for
microprocessor power supply. It is designed to drive N Channel Mosfets in a synchronous-
rectified buck topology. The device works properly with Vcc ranging from 5V to 12V and
regulates the output voltage starting from a 1.26V power stage supply voltage (Vin). The
output voltage of the converter can be precisely regulated, programming the VID pins, from
1.050V to 1.825V with 25mV binary steps, with a maximum tolerance of ±1% over
temperature and line voltage variations. The device provides voltage-mode control with fast
transient response. It includes a 200kHz free-running oscillator that is adjustable from
50kHz to 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 10V/ms
slew rate which permits high converter bandwidth for fast transient performance. The
resulting PWM duty cycle ranges from 0% to 100%. The device protects against over-
current conditions entering in HICCUP mode. The device monitors the current by using the
rds(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
The device is available in SO20 package.
5.1
Oscillator
The switching frequency is internally fixed to 200kHz. The internal oscillator generates the
triangular waveform for the PWM charging and discharging with a constant current an
internal capacitor. The current delivered to the oscillator is tipically 50
A (F
SW = 200KHz)
and may be varied using an external resistor (RT) connected between RT pin and GND or
VCC. Since the RT pin is maintained at fixed voltage (typ. 1.235V), the frequency is varied
proportionally to the current sinked (forced) from (into) the pin.
In particular connecting it to GND the frequency is increased (current is sinked from the pin),
according to the following relationship:
Equation 1
f
S
200kHz
4.94 10
6
R
T k
()
-------------------------
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
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| L6912-2 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,2/BG |
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| L6916D | 功能描述:運(yùn)算放大器 - 運(yùn)放 POWER SUPPLY RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| L6916DTR | 功能描述:運(yùn)算放大器 - 運(yùn)放 POWER SUPPLY RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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