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Fairchild FPF2300, Руководство пользователя

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F

P

F2300/02/03 — Dual-Out

put Current Limit Switch

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Rev. I40

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FPF2300/02/03  •  Rev. 1.1.3

19

Содержание FPF2300

Страница 1: ...and pull the fault signal pin FLAGB LOW The FPF2300 has an auto restart feature that turns the switch on again after 504ms if the ON pin is still active For the FPF2303 a current limit condition immediately pulls the fault signal pin LOW and the part remains in the constant current mode until the switch current falls below the current limit For the FPF2300 through FPF2303 the current limit is typi...

Страница 2: ...pplication Functional Block Diagram Figure 4 Block Diagram ON OFF ONA IN GND FPF2300 2 3 FLAGB B OUTA TO LOAD A FLAGB A ON OFF ONB OUTB TO LOAD B CIN COUTB COUTA IN 1 8V 5 5V IN ONA ONB OUTA FLAGB A OUTB FLAGB B GND CURRENT LIMIT B THERMAL PROTECTION B CONTROL LOGIC B REVERSE CURRENT BLOCKING CURRENT LIMIT A THERMAL PROTECTION A CONTROL LOGIC A REVERSE CURRENT BLOCKING UVLO ...

Страница 3: ...ch B Active LOW 5 FLAGB B Fault Output B Active LO open drain output which indicates an over supply UVLO and thermal shutdown 6 OUTB Switch Output Output of the power switch B 7 OUTA Switch Output Output of the power switch A 8 FLAGB A Fault Output A Active LO open drain output which indicates an over supply UVLO and thermal shutdown 9 MLP Thermal Pad IC Substrate which can be connected to GND for...

Страница 4: ...sed on JEDEC STD 51 3 4 Soldered thermal pad on a four layer with two vias connected with GND plane base on JEDEC STD 51 5 7 Recommended Operating Range The Recommended Operating Conditions table defines the conditions for actual device operation Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications Fairchild does not recommend exceeding them ...

Страница 5: ...IN 1 8V 0 8 V IN 5 5V 1 4 VIL ON Input Logic Low Voltage IN 1 8V 0 5 V IN 5 5V 0 9 ION ON Input Leakage VON IN or GND 1 1 μA FLAGB Output Logic Low Voltage IN 5 5V ISINK 1mA 0 1 0 2 V IN 1 8V ISINK 1mA 0 15 0 30 FLAGB Output High Leakage Current IN VON 5V 1 μA Protections ILIM Current Limit IN 3 3V VOUTA VOUTB 3V TA 25 C 1 1 1 3 1 5 A TSD Thermal Shutdown Shutdown Threshold 140 C Return from Shutd...

Страница 6: ...VOLTA GE V ON RESISTANCE mOhms RO NA RO NB ONA O NB 0V IO UT 200m A TA 25 C Figure 10 RON vs Supply Voltage MLP Figure 11 RON vs Temperature SO8 Figure 12 RON vs Temperature MLP Figure 9 IN Shutdown Current vs Temperature Figure 7 Quiescent Current vs Supply Voltage Figure 8 Quiescent Current vs Temperature 0 00 10 00 20 00 30 00 40 00 50 00 60 00 70 00 40 15 10 35 60 85 TJ JUNCTIONTEM PERA TURE C...

Страница 7: ...Supply Voltage 0 0 0 3 0 5 0 8 1 0 1 3 1 5 1 8 2 2 2 5 2 9 3 3 3 7 4 0 4 4 4 8 5 1 5 5 SUPPLYVO LTA G E V ON THRESHOLD VOLTAGE V VIH VIL TA 25 C 0 0 0 2 0 4 0 6 0 8 1 0 1 2 40 15 10 35 60 85 TJ JUNCTIO NTEM PERA TURE C ON THRESHOLD VOLTAGE V IN 3 3V IN 5 5V IN 1 8V 0 0 0 2 0 4 0 6 0 8 1 0 1 2 40 15 10 35 60 85 TJ JUNCTIO NTEM PERA TURE C ON THRESHOLD VOLTAGE V IN 3 3V IN 5 5V IN 1 8V 1250 1260 127...

Страница 8: ...s Temperature Figure 19 tDON tDOFF vs Temperature Figure 20 tRISE tFALL vs Temperature 0 2 4 6 8 10 12 14 16 18 20 40 15 10 35 60 85 TJ JUNCTIO NTEM PERA TURE C RISE FALL TIME us tF tR IN 3 3V RL 500O hm s CL 0 1uF IN 3 3V RL 500O hm s 7 0 7 5 8 0 8 5 9 0 9 5 10 0 10 5 11 0 40 15 10 35 60 85 TJ JUNCTIO NTEM PERA TURE C OVER CURRENT BLANKING TIME ms FLAG B A FLAG B B FPF2300 2 IN 3 3V O NA O NB 0V ...

Страница 9: ...ut Capacitor Figure 30 Output Voltage at Startup with Different Output Capacitor Figure 27 Startup FLAGB Blanking Time FPF2303 Figure 25 tOFF Response Figure 26 Over Current Blanking Time FPF2300 2 Figure 28 Auto Restart Time FPF2300 2ms DIV OUT 5V DIV IN 5V COUT 10μF RL 2 8Ω ON 2V DIV FLAGB 2V DIV IOUT 1A DIV tBLANK 2ms DIV OUT 2V DIV COUT 10μF RL 3 3Ω ON 2V DIV FLAGB 2V DIV IOUT 1A DIV tSTART_BL...

Страница 10: ...g Capacitive Load Hot Plug In Event Figure 31 Current Limit Response Time Both Channels are in OC Figure 32 Startup FLAGB Blanking Time Figure 34 Inrush Response During Capacitive and Resistive Load Hot Plug In Event FLAGB B 2V DIV IN 5V ON 3 3V COUTA 100μF COUTB 100μF RLA RLB 1Ω IN 5V DIV ON 2V DIV 10ms DIV FLAGB A 2V DIV OUT 5V DIV IN 5V COUT 47μF CL 470μF RL 5Ω IN 5V DIV ON 5V DIV 1ms DIV IOUT ...

Страница 11: ...ng time of 10ms typical during which the switch acts as a constant current source At the end of the blanking time the switch is turned off The FPF2303 has no current limit blanking period so it remains in a constant current state until the ON pin of the affected switch is deactivated or the thermal shutdown turns off the switch Fault Reporting Over current input under voltage and over temperature ...

Страница 12: ...w heat to stay confined and not affect the second switch operation During an over temperature condition the FLAGB is pulled LOW and the affected switch is turned off If the temperature of the die drops below the threshold temperature the switch automatically turns on again To avoid unwanted thermal oscillations a 10 C typical thermal hysteresis is implemented between thermal shutdown entry and exi...

Страница 13: ...B ports can be imple mented with a single FPF230X part and current limiting is pro vided based on a two port basis for a cost effective solution Figure 39 Individual Port Power Management for Self Powered 4 Port USB Hub In Figure 39 each USB port is connected with each output Four USB ports can be implemented with two FPF230X parts Current limiting and control are provided based on a single port C...

Страница 14: ...mum power dissipation occurs when the output of switch is shorted to ground For the FPF2300 the power dissipation scales with the auto restart time tRSTRT and the over current blanking time tBLANK In this case the maximum power dissipated for the FPF2300 is which results in Note that this is below the maximum package power dissipation and the thermal shutdown feature protection provides additional...

Страница 15: ... These techniques are listed in order of the significance of impact 1 Thermal performance of the load switch can be improved by connecting the DAP Die Attach Pad of MLP 3x3mm package to the GND plane of the PCB 2 Embedding two exposed through hole vias into the DAP pin 9 provides a path for heat to transfer to the back GND plane of the PCB A drill size of round 15 mils 0 4mm with 1 ounce copper pl...

Страница 16: ...te of the each channel can be configured using J1 and J2 jumpers In addition both channels can be controlled by ONA and ONB test pints Thermal performance of the board is improved using techniques in the layout recommendations section R3 and R4 resistors are used on the board to sink a light load current when switches are activated Figure 43 Top SST and AST Layers MLP 3x3mm and SO8 Figure 44 Botto...

Страница 17: ...Drawings may change in any manner without notice Please note the revision and or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision Package specifications do not expand the terms of Fairchild s worldwide terms and conditions specifically the warranty therein which covers Fairchild products Always visit Fairchild Semiconductor s onl...

Страница 18: ...ponents Drawings may change in any manner without notice Please note the revision and or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision Package specifications do not expand the terms of Fairchild s worldwide terms and conditions specifically the warranty therein which covers Fairchild products Always visit Fairchild Semiconduct...

Страница 19: ...M TinyWire TriFault Detect TRUECURRENT μSerDes UHC Ultra FRFET UniFET VCX VisualMax XS Datasheet Identification Product Status Definition Advance Information Formative In Design Datasheet contains the design specifications for product development Specifications may change in any manner without notice Preliminary First Production Datasheet contains preliminary data supplementary data will be publis...

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