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參數(shù)資料
| 型號： | IR3500 |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件頁數(shù)： | 21/47頁 |
| 文件大?。?/td> | 778K |
| 代理商： | IR3500 |
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IR3500
Page 21 of 47
June 12, 2007
START DELAY (TD1)
VCC
(12V)
ENABLE
1.4V
VOUT
VRRDY
3.92V
SS/DEL
NORMAL OPERATION
VDAC
4.0V
VID
SOFT START
TIME (TD2)
VRRDY DELAY TIME (TD3)
EAOUT
Figure 12 - Start-up sequence of converter without boot voltage
Constant Over-Current Control during Soft Start
The over current limit threshold is set by a resistor connected between OCSET and VDAC. If the IIN pin voltage,
which is proportional to the average current plus VDAC voltage, exceeds the OCSET voltage during soft start, the
constant over-current control is activated. Figure 13 shows the constant over-current control with delay during soft
start. The delay time is set by the ROSC resistor, which sets the number of switching cycles for the delay counter.
The delay is required since over-current conditions can occur as part of normal operation due to inrush current. If an
over-current occurs during soft start (before VRRDY is asserted), the SS/DEL voltage is regulated by the over
current amplifier to limit the output current below the threshold set by OCSET voltage. If the over-current condition
persists after delay time is reached, the fault latch will be set pulling the error amplifier’s output low and inhibiting
switching in the phase ICs. The SS/DEL capacitor will discharge until it reaches 0.2V and the fault latch is reset
allowing a normal soft start to occur. If an over-current condition is again encountered during the soft start cycle, the
constant over-current control actions will repeat and the converter will be in hiccup mode. The delay time is
controlled by a counter which is triggered by clock. The counter values vary with switching frequency per phase in
order to have a similar delay time for different switching frequencies.
Over-Current Hiccup Protection after Soft Start
The over current limit threshold is set by a resistor connected between OCSET and VDAC pins. Figure 13 shows
the constant over-current control with delay after VRRDY is asserted. The delay is required since over-current
conditions can occur as part of normal operation due to load transients or VID transitions.
If the IIN pin voltage, which is proportional to the average current plus VDAC voltage, exceeds the OCSET voltage
after VRRDY is asserted, it will initiate the discharge of the capacitor at SS/DEL. The magnitude of the discharge
current is proportional to the voltage difference between IIN and OCSET and has a maximum nominal value of
55uA. If the over-current condition persists long enough for the SS/DEL capacitor to discharge below the 120mV
offset of the delay comparator, the fault latch will be set pulling the error amplifier’s output low and inhibiting
switching in the phase ICs and de-asserting the VRRDY signal. The output current is not controlled during the delay
time. The SS/DEL capacitor will discharge until it reaches 200 mV and the fault latch is reset allowing a normal soft
start to occur. If an over-current condition is again encountered during the soft start cycle, the over-current action
will repeat and the converter will be in hiccup mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3500A | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| IR3500AMPBF | 功能描述:IC CTRL XPHASE3 VR11.0 32-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase3™ 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| IR3500AMTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 IR3500 IC xPHASE3 AMD PVID CTRL IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3500MPBF | 功能描述:IC XPHASE3 CONTROL 32-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase3™ 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| IR3500MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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