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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 文件页数： | 13/41页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 32L MLPQ |
| 标准包装： | 3,000 |
| 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： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-MLPQ（5x5） |
| 包装： | 带卷 (TR) |
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IR3080
The IR3080 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 IR3080 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.
VIDPWR
700
800ns
BLANKING
VID = 11111X DETECT
VID5
VID0
VID1
VID2
VID INPUT
COMPARATORS
(1 OF 6 SHOWN)
DIGITAL TO
ANALOG
CONVERTER
+
"FAST" VDAC
+
VDAC BUFFER
AMP
VID3
VID4
+
-
ISOURCE
ISINK
"SLOW" VDAC
VDAC
VOSNS-
EAOUT
TO ERROR AMP
0.6V
-
VID DOWN
BB CLAMP
75%
7mV
-
ENABLE
BODY
BRAKE
S
1.7us
BLANKING
VID STEP-DOWN
DETECT
COMPARATOR
-
+
IBBFB
LATCH
R
REGULATION
DETECT
COMPARATOR
IROSC (From Current Source Generator)
BBFB
Figure 7. VID Control Block Diagram
Page 13 of 41
9 /30/04
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3080MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC CTRL IC 200 to 700mV 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 |
| IR3080PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| IR3081 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE VR 10.0 CONTROL IC |
| IR3081A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AM | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
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