參數(shù)資料
型號(hào)： L6711
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁(yè)數(shù)： 40/50頁(yè)
文件大?。?/td> 679K
代理商： L6711
Obsolete
Product(s)
- Obsolete
Product(s)
L6711
Layout guidelines
45/50
18.2
Power connections related.
Figure 24 shows some small signal components placement.
●
Gate and phase traces must be sized according to the driver RMS current delivered to
the power mosfet. The device robustness allows managing applications with the power
section far from the controller without losing performances. Anyway, when possible, it is
suggested to minimize the distance between controller and power section.
In addition, since the PHASEx pin is the return path for the high side driver, this pin
might be connected directly to the High Side mosfet Source pin to have a proper driving
for this mosfet. For the LS mosfets, the return path is the PGNDx pin: it can be
connected directly to the power ground plane.
●
Bootstrap capacitor must be placed as close as possible to the BOOTx and PHASEx
pins to minimize the loop that is created.
●
Decoupling capacitor from VCC and SGND placed as close as possible to the involved
pins.
●
Decoupling capacitor from VCCDRx and PGNDx placed as close as possible to those
pins. This capacitor sustains the peak currents requested by the low-side mosfet
drivers.
●
Sensible components must be referred to SGND (when present): frequency set-up
resistor ROSC, offset resistor ROFFSET, TC resistor RTC and OVP resistor ROVP.
●
Star grounding: Connect SGND to PGND plane in a single point to avoid that drops due
to the high current delivered causes errors in the device behavior.
●
An additional ceramic capacitor is suggested to place near HS mosfet drain. This helps
in reducing HF noise.
●
VSEN pin filtered vs. SGND helps in reducing noise injection into device.
●
OUTEN pin filtered vs. SGND helps in reducing false trip due to coupled noise: take
care in routing driving net for this pin in order to minimize coupled noise.
●
PHASE pin spikes. Since the HS mosfet switches hardly, heavy voltage spikes can be
observed on the PHASEx pins. If these voltage spikes overcome the max breakdown
voltage of the pin, the device can absorb energy and it can cause damages. The
voltage spikes must be limited by proper layout; by the use of gate resistors, Schottky
diodes in parallel to the low side mosfets and/or snubber network on the low side
mosfets, and cannot overcome 26V, for 20nSec, at FSW = 600kHz.
●
Boot Capacitor Extra Charge. Systems that do not use Schottky diodes might show big
negative spikes on the phase pin. This spike can be limited as well as the positive spike
but has an additional consequence: it causes the bootstrap capacitor to be over-
charged. This extra-charge can cause, in the worst case condition of maximum input
voltage and during particular transients, that boot-to-phase voltage overcomes the abs.
max. ratings also causing device failures. It is then suggested in this cases to limit this
extra-charge by adding a small resistor in series to the boot diode (one resistor can be
enough for all the three diodes if placed upstream the diode anode, see Figure 23).
相關(guān)PDF資料
PDF描述
L6714TR SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
L6714 SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
L6725TR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6711_06 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3 Phase controller with dynamic VID and selectable DACs
L6711TR 功能描述:DC/DC 開(kāi)關(guān)控制器 3 PHASE CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
L6712 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712_05 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712A 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
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