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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| 中文描述： | XPHASE VRD10控制集成电路VCCVID |
| 文件页数： | 13/41页 |
| 文件大小： | 2267K |
| 代理商： | IR3080MTR |
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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
during a transition to a lower VID code can be
disabled by connecting the BBFB pin to ground.
VIDPWR
700
+
-
0.6V
VID INPUT
COMPARATORS
(1 OF 6 SHOWN)
-
DIGITAL TO
ANALOG
CONVERTER
+
+
VDAC BUFFER
AMP
ISINK
ISOURCE
"FAST" VDAC
VDAC
"SLOW" VDAC
-
+
-
VID DOWN
BB CLAMP
75%
+
-
+
-
+
-
7mV
R
D
S
1.7us
BLANKING
REGULATION
DETECT
COMPARATOR
R
BODY
BRAKE
LATCH
VID STEP-DOWN
DETECT
COMPARATOR
800ns
BLANKING
IBBFB
+
-
VID = 11111X DETECT
ENABLE
IROSC (From Current Source Generator)
TO ERROR AMP
VOSNS-
BBFB
VID3
VID4
VID5
VID0
VID1
EAOUT
VID2
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 |
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|---|---|
| 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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