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| 型号： | IR3514MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/46页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROL HYBRD 40-MLPQ |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-MLPQ |
| 供应商设备封装： | 40-MLPQ（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3514MTRPBFDKR |
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IR3514
PHASE IC
CLOCK
PULSE
EAIN
PWMRMP
VDAC
GATEH
GATEL
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 FAULT)
STEADY-STATE
OPERATION
Figure 7 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;
T SLEW
L * ( I MAX I MIN )
V O
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;
T SLEW
L * ( I MAX I MIN )
V O V BODYDIODE
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 amplifier’s output voltage drops below
the VDAC voltage or a programmable voltage, 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 8. 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 R CS and capacitor C CS are chosen so that the time constant of R CS and C CS 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 C CS 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 does affects the AC component of the inductor current.
Page 15 of 46
10/30/2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3515SPBF | 制造商:International Rectifier 功能描述:MOSFET, Power;N-Ch;VDSS 150V;RDS(ON) 0.045Ohm;ID 41A;D2Pak;PD 200W;VGS +/-30V |
| IR3519 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Synchronous MOSFET GateDriver IC |
| IR3519MTRPBF | 功能描述:功率驱动器IC SYNC MOSFET GATE DRVR IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3519STRPBF | 功能描述:功率驱动器IC SYNC FET Gate DRVR 15ms 3.3 and 5V 0.4 RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3521 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM AMD SVID CONTROL IC |
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