Electronic Components Datasheet Search |
|
NCP81105 Datasheet(PDF) 4 Page - ON Semiconductor |
|
NCP81105 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 36 page NCP81105, NCP81105H http://onsemi.com 4 PIN LIST AND DESCRIPTION Pin No. Symbol Description 1 EN Logic input. Logic high enables the NCP81105 and logic low disables it. 2 VCC Power for the internal control circuits. A decoupling capacitor must be connected from this pin to ground. 3 VR_HOT# Open drain (logic level) output for over−temperature reporting. Low indicates high temp. 4 SDIO Bidirectional Serial VID data interface. 5 ALERT# Open drain Serial VID ALERT# output. 6 SCLK Serial VID clock input. 7 ROSC This pin outputs a constant current. A resistance from this pin to ground programs the switching fre- quency. 8 VR_RDY Open drain output. High indicates that the NCP81105 is regulating the output. 9 TSENSE Temperature sense input. 10 OD# Phase Disabling Output, tied to the Enable, SMOD or ZCD_EN# pin of phases 2 and 3 DrMOS. Except in PS0 mode, this output pulls low to disable the DrMOS if connected to an enable input. If connected to a DrMOS SMOD or ZCD_EN# input, both HS & LS FETs are held off since PWM2 & PWM3 are also low. Actively pulls high in PS0 mode. 11 SMOD Phase 1 Zero Cross Detection (ZCD) disable output. In PS2 & PS3, SMOD pulls LOW when phase 1 inductor current is negative to perform (or allow the DrMOS ZCD function to perform) diode emulation, and pulls HIGH when phase 1 inductor current is positive. In PS0 & PS1, SMOD stays high to force the phase 1 DrMOS into Continuous Conduction. 12 PWM2 PWM output to Phase 2 DrMOS 13 PWM3 PWM output to Phase 3 DrMOS 14 PWM1 PWM output to Phase 1 DrMOS 15 DRVON Enable output for DrMOS 16 IMAX During startup, a resistor from this pin to ground programs ICC_MAX. 17 INT_SEL During startup, a resistor from this pin to ground programs the low frequency compensator pole of the NCP81105 voltage control feedback loop. 18 CSP1 Positive input to phase 1 current sense amplifier for balancing phase currents 19 CSN1 Negative input to phase 1 current sense amplifier 20 CSP3 Positive input to phase 3 current sense amplifier for balancing phase currents 21 CSN3 Negative input to phase 3 current sense amplifier 22 CSP2 Positive input to phase 2 current sense amplifier for balancing phase currents 23 CSN2 Negative input to phase 2 current balance sense amplifier 24 CSREF Non−inverting input for the total output current sense amplifier. Also, the absolute OVP input. 25 CSSUM Inverting input of total output current sense amplifier. 26 CSCOMP Output of total output current sense amplifier. 27 ILIM Input to program the over−current shutdown threshold. 28 IOUT Total current monitor output. A resistor from this pin to ground calibrates SVID output current reporting. 29 VRMP VDC applied to this pin provides feed−forward compensation for the pulsewidth modulator. The current into this pin controls the slope of PWM ramp. A low voltage on this pin will inhibit NCP81105 startup. 30 VBOOT During startup, a resistor from this pin to ground programs the BOOT voltage 31 DGAIN During startup, a resistor from this pin to ground programs the scaling of the output Droop with respect to the total output current signal produced between CSCOMP and CSREF. 32 COMP Output of the error amplifier. 33 FB Error amplifier voltage feedback input. 34 DIFFOUT Output of the differential remote sense amplifier. 35 VSN Inverting input to the differential remote sense amplifier (VSS sense). 36 VSP Non−inverting input to the differential remote sense amplifier (VCC sense). 37 GND Power supply return (QFN Flag) |
Similar Part No. - NCP81105 |
|
Similar Description - NCP81105 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |