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參數(shù)資料
| 型號： | L6712D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, PDSO28 |
| 封裝： | SO-28 |
| 文件頁數(shù)： | 28/29頁 |
| 文件大?。?/td> | 624K |
| 代理商： | L6712D |
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L6712A L6712
8/29
3
Device Description
The device is an integrated circuit realized in BCD technology. It provides complete control logic and pro-
tections for a high performance dual-phase step-down converter optimized for high current DC/DC appli-
cations. It is designed to drive N-Channel Mosfets in a two-phase synchronous-rectified buck topology. A
180 deg phase shift is provided between the two phases allowing reduction in the input capacitor current
ripple, reducing also the size and the losses. The output voltage of the converter can be precisely regu-
lated, programming the VID pins, from 0.900 to 3.300V with a maximum tolerance of ±0.9% over temper-
ature and line voltage variations. The programmable Remote Sense Amplifier avoids the use of external
resistor divider allowing recovering drops across distribution lines and also adjusting output voltage to dif-
ferent values from the available reference. The device provides an average current-mode control with fast
transient response. It includes a 150kHz free-running oscillator externally adjustable through a resistor.
The error amplifier features a 15V/
s slew rate that permits high converter bandwidth for fast transient per-
formances. Current information is read across the lower mosfets RdsON or across a sense resistor placed
in series to the LS mos in fully differential mode. The current information corrects the PWM outputs in order
to equalize the average current carried by each phase. Current sharing between the two phases is then
limited at ±10% over static and dynamic conditions unless considering the sensing element spread. Droop
effect can be programmed in order to minimize output filter and load transient response: the function can
be disabled and the current information available on the pin can be used for other purposes. The device
protects against Over-Current, with an OC threshold for each phase, entering in constant current mode.
Since the current is read across the low side mosfets, the device keeps constant the bottom of the induc-
tors current triangular waveform. When an Under Voltage is detected the device resets with all mosfets
OFF and suddenly re-starts. The device also performs a crowbar Over-Voltage protection that immediate-
ly latches the operations turning ON the lower driver and driving high the FAULT pin.
3.1 OSCILLATOR
The switching frequency is internally fixed at 150kHz. Each phase works at the frequency fixed by the os-
cillator so that the resulting switching frequency at the load side results in being doubled.
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 typically 25
A
(Fsw=150kHz) and may be varied using an external resistor (ROSC) connected between OSC pin and
SGND or Vcc. Since the OSC pin is maintained at fixed voltage (Typ. 1.237V), the frequency is varied
proportionally to the current sunk (forced) from (into) the pin considering the internal gain of 6KHz/
A.
In particular connecting it to SGND the frequency is increased (current is sunk from the pin), while con-
necting ROSC to Vcc=12V the frequency is reduced (current is forced into the pin), according to the follow-
ing relationships:
ROSC vs. GND:
ROSC vs. 12V:
Forcing 25
A into this pin, the device stops switching because no current is delivered to the oscillator
F
SW
150 KHz
[] 1.237
R
OSC
--------------- 6
kHz
A
-----------
150 kHz
[] 7.422 10
6
R
OSC K
[]
------------------------------ kHz
[]
+
=
+
=
F
SW
150 KHz
[] 12 1.237
–
R
OSC
-------------------------
–
6
kHz
A
-----------
150 kHz
[] 6.457 10
7
R
OSC K
[]
------------------------------ kHz
[]
–
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L6712DTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved 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 |
| L6712Q | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved 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 |
| L6712QTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved 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 |
| L6712大電流DCDC轉(zhuǎn)換器 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| L6713A | 功能描述:DC/DC 開關(guān)控制器 2/3 Phase controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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