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參數(shù)資料
| 型號(hào)： | IR3086 |
| 廠商： | International Rectifier |
| 英文描述： | PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
| 中文描述： | 相位IC帶OVP，故障及超溫檢測(cè) |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大小： | 417K |
| 代理商： | IR3086 |
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IR3086
Page 9 of 15
9/1/03
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;
T
SLEW
= [L x (I
MAX
- I
MIN
)] / Vout
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;
T
SLEW
= [L x (I
MAX
- I
MIN
)] / (Vout + V
BODY DIODE
)
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 “0% Duty Cycle 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 4 depicts PWM operating waveforms under various conditions
PHASE IC
PULSE
EAIN
VDAC
PWMRMP
GATEH
GATEL
STEADY-STATE
DUTY CYCLE INCREASE
INCREASE
DUTY CYCLE DECREASE
(FEED-FORWARD)
DUTY CYCLE DECREASE DUE TO LOAD
(VCC UV, VCCVID UV, OCP, VID=11111X)
STEADY-STATE
91% VDAC
Figure 4 – PWM Operating Waveforms
Lossless Average Inductor Current Sensing
Inductor current can be sensed by connecting a resistor and a capacitor in parallel with the inductor and measuring
the voltage across the capacitor. The equation of the sensing network is,
1
)
(
)
(
S
S
L
L
S
S
L
C
C
sR
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. 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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| IR3086AMPBF | 功能描述:IC PHASE CONTROLLER OVP 20MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase™ 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 |
| IR3086AMPBF | 制造商:International Rectifier 功能描述:Controller IC Package/Case:20-MLPQ |
| IR3086AMTR | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
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