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参数资料
| 型号： | IR3500MPBF |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件页数： | 20/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500MPBF |
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IR3500
Page 20 of 47
June 12, 2007
Figure 11 depicts start-up sequence of converter with VR 11 VID with boot voltage, which is selected by VIDSEL pin
based on Table 1. If there is no fault, the SS/DEL pin will start charging when the enable crosses the threshold. The
error amplifier output EAOUT is clamped low until SS/DEL reaches 1.4V. The error amplifier will then regulate the
converter’s output voltage to match the SS/DEL voltage less the 1.4V offset until the converter output reaches the
1.1V boot voltage. The SS/DEL voltage continues to increase until it rises above the 3.0V threshold of VID delay
comparator. The VID set inputs are then activated and VDAC pin transitions to the level determined by the VID
inputs. The SS/DEL voltage continues to increase until it rises above 3.92V and allows the VRRDY signal to be
asserted. SS/DEL finally settles at 4.0V, indicating the end of the soft start.
Figure 12 shows start-up sequence of converter VR 11 VID without boot voltage or AMD Opteron, AMD 6-bit VID
which is selected by VIDSEL pin based on Table 1. If there is no fault, the SS/DEL pin will start charging. The error
amplifier output EAOUT is clamped low until SS/DEL reaches 1.4V. The error amplifier will then regulate the
converter’s output voltage to match the SS/DEL voltage less the 1.4V offset until the converter output reaches the
level determined by the VID inputs. The SS/DEL voltage continues to increase until it rises above 3.92V and allows
the VRRDY signal to be asserted. SS/DEL finally settles at 4.0V, indicating the end of the soft start.
SOFT START
TIME (TD2)
TD5
VRRDY
3.92V
SS/DEL
(12V)
START DELAY (TD1)
VCC
ENABLE
1.4V
VOUT
4.0V
VID SAMPLE
TIME (TD3)
VDAC
NORMAL OPERATION
3V
TD4
VRRDY DELAY
TIME (TD4+TD5)
1.1V
VID
EAOUT
Figure 11 - Start-up sequence of converter with boot voltage
VCCL under voltage lock-out, VID fault modes, over current, as well as a low signal on the ENABLE input
immediately sets the fault latch, which causes the EAOUT pin to drive low turning off the phase IC drivers. The
VRRDY pin also drives low, and SS/DEL begin to discharge until the voltage reaches 0.2V. If the fault has cleared
the fault latch will be reset by the discharge comparator allowing a normal soft start to occur.
Other fault conditions, such as over voltage, open sense lines, open loop monitor, and open daisy chain, set
different fault latches, which start discharging SS/DEL, pull down EAOUT voltage and drive VRRDY low. However,
the latches can only be reset by cycling VCCL power.
相关PDF资料 |
PDF描述 |
|---|---|
| IR3500MTRPBF | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| IR3623MPBF | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3500MTRPBF | 功能描述:开关变换器、稳压器与控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION 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 |
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V AMD SVID 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 |
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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