参数资料
| 型号： | IR3087M |
| 厂商： | International Rectifier |
| 文件页数： | 13/35页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE W/OVP/TM CTRL 20-MLPQ |
| 标准包装： | 5 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 电源电压： | 8.4 V ~ 21 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IR3087M |
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IR3087
When designing for OVP the overall system must be considered. In many cases the over-current protection of the
AC-DC or DC-DC converter supplying the multiphase converter will be triggered thus providing effective protection
without damage as long as all PCB traces and components are sized to handle the worst-case maximum current. If
this is not possible a fuse can be added in the input supply to the multiphase converter. One scenario to be careful
of is where the input voltage to the multiphase converter may be pulled below the level where the ICs can provide
adequate voltage to the low side MOSFET thus defeating OVP.
Dynamic changes in the VID code to a lower output voltage may trigger OVP. For example; a 250mV decrease in
output voltage combined with a light load condition will cause the low side MOSFETs to turn on and interfere with
Body Braking TM . This will not cause a problem, however, as Body Braking TM will resume once the output voltage is
less than 125mV above the VID voltage.
Since CSIN- pin is also used as the inductor current sensing input, it is usually connected to the local converter
output, which may be far away from the load of the multiphase converter. Excessive distribution impedance
between the converter and load may trigger OVP during normal operation. If the voltage drop across the distribution
impedance exceeds the minimum OVP comparator threshold of 100mV plus VID offset and voltage positioning, the
IR3087 can not be used. The IR3088A Phase IC without OVP should be used instead in applications with excessive
distribution impedance and very small or no AVP. For example, a converter having 25mV of VID offset, 125mV of
AVP at full load, and 100mV of drop in the distribution path at full load would be OK, since 100mV + 25mV + 125mV
= 250mV which is greater than the 100mV drop. However, a converter having 25mV of VID offset, no AVP, and
130mV of drop in the distribution path would require IR3088A, since 100mV + 25mV + 0mV = 125mV which is
smaller than the 130mV drop.
Converter with higher output voltage than VID voltage may also trigger OVP during normal operation, and IR3088A
should be used to replace IR3087.
Thermal Monitoring (VRHOT)
The IR3087 senses its own die temperature and produces a voltage at the input of the VRHOT comparator that is
proportional to temperature. An external resistor divider connected from VBIAS to the HOTSET pin and ground can
be used to program the thermal trip point of the VRHOT comparator. The VRHOT pin is an open-collector output
and should be pulled up to a voltage source through a resistor. If the thermal trip point is reached the VRHOT
output drives low.
Opti-Phase TM
The number of phases chosen for a particular design is based upon meeting thermal requirements and minimizing
the number of input and output capacitors at the maximum output current. At currents less than the maximum
efficiency will increase if less phases are used. Turning off phases as the output current decreases increases
efficiency by eliminating the gate charging losses, MOSFET switching losses, and circulating currents in the
MOSFETS and output inductors. For each unique design there will be an optimal point were phases should be
turned off, one after another, to achieve the maximum efficiency over the entire output current range.
The IR3087 implements patent pending Opti-Phase TM control allowing programmable shutdown of phases as a
function of converter output current. The Opti-Phase TM comparator monitors the voltage on the ISHARE pin less the
voltage on the DACIN pin. This voltage provides a direct indication of converter output current. A resistor divider
connected between the BIASIN, OPTIPHS, and LGND pins programs the threshold of the Opti-Phase TM
comparator. If the converter output current drops below the programmed level the GATEH and GATEL pins will both
drive low turning off the MOSFETs and causing the inductor current to begin to decay. The output voltage will begin
to sag causing the Control IC to immediately increase the duty cycle of the remaining phase(s) to compensate. The
voltage on the ISHARE will remain constant as it represents the converter output current rather than the current in
the individual phases.
Opti-Phase TM can be disabled by connecting the OPTIPHS pin to the BIASIN pin. This must be done on at least one
phase IC per converter to ensure operation under zero load conditions.
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PDF描述 |
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| IR3092MTRPBF | IC CONTROLLER 2PHASE 48-MLPQ |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3087MPBF | 功能描述:IC XPHASE W/OVP/TM CTRL 20MLPQ 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 |
| IR3087MTR | 功能描述:IC XPHASE W/OVP/TM CTRL 20L-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 |
| IR3087MTRPBF | 功能描述:IC CONTROLLER PHASE 20MLPQ 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 |
| IR3087PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH OPTI-PHASETM, OVP, AND OVERTEMP DETECT |
| IR3088 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT |
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