參數資料
型號： IR3082
廠商： International Rectifier
英文描述： XPHASE AMD OPTERON/ATHLON 64 CONTROL IC
中文描述： XPHASE AMD皓龍/速龍64控制IC
文件頁數： 9/33頁
文件大?。?/td> 444K
代理商： IR3082
IR3082
Page 9 of 9
12/17/04
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
SLEW
V
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
BODY
DIODE
. The minimum time required to reduce the current in the inductor in response to a load transient decrease is
now;
I
L
T
+
BODYDIODE
O
MIN
MAX
V
SLEW
V
I
=
)
(
Since the voltage drop in the body diode is often higher than output voltage, the inductor current slew rate can be
increased by 2X or more. This patent pending technique is referred to as “Body Braking” and is accomplished
through the “Body Braking Comparator” located in the Phase IC. If the Error Amp’s output voltage drops below 91%
of the VDAC voltage this comparator turns off the low side gate driver.
Figure 5 depicts PWM operating waveforms under various conditions.
PHASE IC
CLOCK
PULSE
EAIN
VDAC
PWMRMP
GATEH
GATEL
STEADY-STATE
OPERATION
DUTY CYCLE DECREASE
DUE TO VIN INCREASE
(FEED-FORWARD)
DUTY CYCLE INCREASE
DUE TO LOAD
INCREASE
DUTY CYCLE DECREASE DUE TO LOAD
DECREASE (BODY BRAKING) OR FAULT
(VCC UV, OCP, VID=11111)
STEADY-STATE
OPERATION
91% VDAC
Figure 5 – PWM Operating Waveforms
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. The equation of the sensing network is,
1
)
(
)
(
CS
CS
L
sR
L
CS
CS
L
C
C
sL
R
+
s
i
C
sR
s
v
s
v
+
=
+
=
1
)
(
1
Usually the resistor Rcs and capacitor Ccs are chosen so that the time constant of Rcs and Ccs equals the time
constant of the inductor which is the inductance L over the inductor DCR (R
L
). If the two time constants match, the
voltage across Ccs is proportional to the current through L, and the sense circuit can be treated as if only a sense
resistor with the value of R
L
was used. The mismatch of the time constants does not affect the measurement of
inductor DC current, but affects the AC component of the inductor current.
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相關代理商/技術參數
參數描述
IR3082AMPBF 功能描述:IC XPHASE CONTROL 9.6V 20-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase™ 應用說明:Ultrasound Imaging Systems Application Note 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用: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 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件
IR3082AMTRPBF 功能描述:開關變換器、穩(wěn)壓器與控制器 9.6V 5Bit VID 300mV XPHASE 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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
IR3082M 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC
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IR3082MPBF 制造商:International Rectifier 功能描述:Controller IC Package/Case:20-MLPQ
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