参数资料
| 型号： | IR3081MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 12/40页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 28MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 11mA |
| 电源电压： | 9.5 V ~ 14 V |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-MLPQ |
| 供应商设备封装： | 28-MLPQ（5x5） |
| 包装： | 剪切带 (CT) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
IR3081PBF
The IR3081PBF can accept changes in the VID code while operating and vary the DAC voltage accordingly. The
sink/source capability of the VDAC buffer amplifier is programmed by the same external resistor that sets the
oscillator frequency. The slew rate of the voltage at the VDAC pin can be adjusted by an external capacitor between
VDAC pin and the VOSNS- pin. A resistor connected in series with this capacitor is required to compensate the
VDAC buffer amplifier. Digital VID transitions result in a smooth analog transition of the VDAC voltage and
converter output voltage minimizing inrush currents in the input and output capacitors and overshoot of the output
voltage.
It is desirable to prevent negative inductor currents in response to a request for a lower VID code. Negative current
transforms the buck converter into a boost converter and transfers energy from the output capacitors back into the
input voltage. This energy can cause voltage spikes and damage the silver box or other components unless they
are specifically designed to handle it. Furthermore, power is wasted during the transfer of energy from the output
back to the input.
The IR3081PBF includes circuitry that turns off both control and synchronous MOSFETs in response to a lower VID
code so that the load current instead of the inductor discharges the output capacitors. A lower VID code is detected
by the VID step-down detect comparator which monitors the “fast” output of the DAC (plus 7mV for noise immunity)
compared to the “slow” output of the VDAC pin. If a dynamic VID step down is detected, the body brake latch is set
and the output of the error amplifier is pulled down to 75% of the DAC voltage by the VID body brake clamp. This
triggers the Body Braking TM function which turns off both high side and low side drivers in the phase ICs.
The converter’s output voltage needs to be monitored and compared to the VDAC voltage to determine when to
resume normal operation. Unfortunately, the voltage on the FB pin can be pulled down by its compensation network
during the sudden decrease in the Error Amplifier’s output voltage so an additional pin BBFB is provided. The BBFB
pin is connected to the converter output voltage and VDRP pin with resistors of the same value as on the FB pin
and therefore provides an un-corrupted representation of converter output voltage. The regulation detect
comparator compares the BBFB to the VDAC voltage and resets the body brake latch releasing the error amplifier’s
output and allowing normal operation to resume. Body Braking TM during a transition to a lower VID code can be
disabled by connecting the BBFB pin to ground.
800ns
BLANKING
VID = 11111X DETECT
VID5
VID0
VID1
VID2
VID INPUT
COMPARATORS
(1 OF 6
DIGITAL TO
ANALOG
CONVERTER
+
"FAST" VDAC
+
VDAC BUFFER
AMP
VID3
VID4
SHOWN)
+
-
ISOURCE
ISINK
"SLOW" VDAC
VDAC
VOSNS-
EAOUT
TO ERROR AMP
0.6V
-
VID DOWN
BB CLAMP
ENABLE
75%
7mV
VID STEP-DOWN
DETECT
-
BODY
BRAKE
S
1.7us
BLANKING
COMPARATOR
-
+
IBBFB
LATCH
R
REGULATION
BBFB
DETECT
COMPARATOR
IROSC (From Current Source Generator)
Figure 7. VID Control Block Diagram
Page 12 of 40
10/01 /04
相关PDF资料 |
PDF描述 |
|---|---|
| IR3081M | IC PHASE CONTROLLER 28-MLPQ |
| IR3082AMTRPBF | IC XPHASE CONTROL 9.6V 20-MLPQ |
| IR3082MTRPBF | IC CTLR XPHASE 20-MLPQ |
| IR3084AMPBF | IC XPHASE CONTROL 28-MLPQ |
| IR3084MTRPBF | IC CTLR XPHASE 28-MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3081MTR | 功能描述:IC PHASE CONTROLLER 28L MLPQ RoHS:否 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 |
| IR3081MTRPBF | 功能描述:IC PHASE CONTROLLER 28-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 |
| IR3082 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
| IR3082AMPBF | 功能描述:IC XPHASE CONTROL 9.6V 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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。