參數(shù)資料
型號(hào)： IR3500
廠商： International Rectifier
英文描述： XPHASE3TM VR11.0 & AMD PVID CONTROL IC
中文描述： XPHASE3TM VR11.0
文件頁(yè)數(shù)： 11/47頁(yè)
文件大?。?/td> 778K
代理商： IR3500
IR3500
Page 11 of 47
June 12, 2007
most systems. The inductor current will increase much more rapidly than decrease in response to load transients.
An additional advantage of the architecture is that differences in ground or input voltage at the phases have no
effect on operation since the PWM ramps are referenced to VDAC. Figure 6 depicts PWM operating waveforms
under various conditions.
The error amplifier is a high speed amplifier with 110 dB of open loop gain. It is not unity gain stable.
PHASE IC
CLOCK
PULSE
VDAC
EAIN
PWMRMP
GATEL
GATEH
DUTY CYCLE DECREASE
DUE TO VIN INCREASE
(FEED-FORWARD)
DUTY CYCLE INCREASE
DUE TO LOAD
INCREASE
STEADY-STATE
OPERATION
STEADY-STATE
OPERATION
DUTY CYCLE DECREASE DUE TO LOAD
DECREASE (BODY BRAKING) OR FAULT
(VCC UV, OCP, VID FAULT)
Figure 6 - PWM Operating Waveforms
Body Braking
TM
In a conventional synchronous buck converter, the minimum time required to reduce the current in the inductor in
response to a load step decrease is;
I
L
T
=
O
MIN
MAX
V
SLEW
I
)
(
*
The slew rate of the inductor current can be significantly increased by turning off the synchronous rectifier in
response to a load step decrease. The switch node voltage is then forced to decrease until conduction of the
synchronous rectifier’s body diode occurs. This increases the voltage across the inductor from Vout to Vout +
V
BODYDIODE
. The minimum time required to reduce the current in the inductor in response to a load transient
decrease is now;
I
L
T
+
Since the voltage drop in the body diode is often comparable to the output voltage, the inductor current slew rate
can be increased significantly. This patented method is referred to as “body braking” and is accomplished through
the “body braking comparator” located in the phase IC. If the error amplifier’s output voltage drops below the output
voltage of the share adjust amplifier in the phase IC, this comparator turns off the low side gate driver.
Lossless Average Inductor Current Sensing
Inductor current can be sensed by connecting a series resistor and a capacitor network in parallel with the inductor
and measuring the voltage across the capacitor, as shown in Figure 7. The equation of the sensing network is,
BODYDIODE
V
O
MIN
MAX
SLEW
V
I
=
)
(
*
相關(guān)PDF資料
PDF描述
IR3500MPBF XPHASE3TM VR11.0 & AMD PVID CONTROL IC
IR3500MTRPBF XPHASE3TM VR11.0 & AMD PVID CONTROL IC
IR3623MPBF HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
IR3624MPBF HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
IR3624MTRPBF HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IR3500A 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.0 & AMD PVID CONTROL IC
IR3500AMPBF 功能描述:IC CTRL XPHASE3 VR11.0 32-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase3™ 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
IR3500AMTRPBF 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 IR3500 IC xPHASE3 AMD PVID CTRL IC 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(kāi)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
IR3500MPBF 功能描述:IC XPHASE3 CONTROL 32-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase3™ 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
IR3500MTRPBF 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION 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(kāi)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
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