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| 型号： | IR3082AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 9/33页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE CONTROL 9.6V 20-MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 12mA |
| 电源电压： | 8.05 V ~ 16 V |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（5x5） |
| 包装： | 剪切带 (CT) |
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IR3082A
Body Braking
TM
L ? ( I MAX I MIN )
V O
L ? ( I MAX I MIN )
V O V BODYDIODE
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
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
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
PWMRMP
GATEH
GATEL
VDAC
91% VDAC
STEADY-STATE
OPERATION
DUTY CYCLE INCREASE
DUE TO LOAD
INCREASE
DUTY CYCLE DECREASE
DUE TO VIN INCREASE
(FEED-FORWARD)
DUTY CYCLE DECREASE DUE TO LOAD
DECREASE (BODY BRAKING) OR FAULT
(VCC UV, OCP, VID=11111)
STEADY-STATE
OPERATION
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,
v C ( s )
v L ( s )
1
1 sR CS C CS
i L ( s )
R L sL
1 sR CS C CS
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.
Page 9 of 33
05/02/2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3082AMTRPBF | 功能描述:开关变换器、稳压器与控制器 9.6V 5Bit VID 300mV XPHASE CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3082M | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
| IR3082MPBF | 功能描述:IC XPHASE CONTROL 20-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3082MPBF | 制造商:International Rectifier 功能描述:Controller IC Package/Case:20-MLPQ |
| IR3082MTR | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
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