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NCP6121S52MNR2G Datasheet(PDF) 23 Page - ON Semiconductor |
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NCP6121S52MNR2G Datasheet(HTML) 23 Page - ON Semiconductor |
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23 / 28 page  NCP6121 http://onsemi.com 23 equations. Cout is the total output capacitance and Rout is the output impedance of the system. + − 5 7 6 CSREF CSCOMP CSSUM Cdroop Rdroop Rdroop + Cout * Rout * 453.6 106 Cdroop + Rout *Cout Rdroop Figure 8. If the Droop at maximum load is less than 100mV at ICCMAX we recommend altering this filter into a voltage divider such that a larger signal can be provided to the ILIMIT resistor by increasing the CSCOMP amp gain for better current monitor accuracy. The DROOP pin divider gain should be set to provide a voltage from DROOP to CSREF equal to the amount of voltage droop desired in the output. A current is applied to the DROOP pin during dynamic VID. In this case Rdroop1 in parallel with Rdroop2 should be equal to Rdroop. + − 5 7 6 CSREF CSSUM CSCOMP Cdroop Rdroop1 Rdroop2 Figure 9. Programming IOUT The IOUT pin sources a current in proportion to the ILIMIT sink current. The voltage on the IOUT pin is monitored by the internal A/D converter and should be scaled with an external resistor to ground such that a load equal to ICCMAX generates a 2 V signal on IOUT. A pull−up resistor from 5 V VCC can be used to offset the IOUT signal positive if needed. RIOUT + 2.0 V * RLIMIT 10 * Rcs2) Rcs1*Rth Rcs1)Rth Rph * IoutICC_MAX * DCR (eq. 7) Programming ICC_MAX and ICC_MAXA The SVID interface provides the platform ICC_MAX value at register 21h for both the multiphase and the single phase rail. A resistor to ground on the IMAX and IMAXA pins program these registers at the time the part in enabled. 10 mA is sourced from these pins to generate a voltage on the program resistor. The value of the register is 1 A per LSB and is set by the equation below. The resistor value should be no less than 10k. ICC_MAX21h + R*10 mA * 256 A 2V (eq. 8) Programming TSENSE and TSENSEA Two temperature sense inputs are provided. A precision current is sourced out the output of the TSENSE and TSENSEA pins to generate a voltage on the temperature sense network. The voltages on the temperature sense inputs are sampled by the internal A/D converter. A 100k NTC similar to the VISHAY ERT−J1VS104JA should be used. Rcomp1 is mainly used for noise. See the specification table for the thermal sensing voltage thresholds and source current. Rcomp2 8.2K RNTC 100K Cfilter 0.1uF AGND AGND Rcomp1 0.0 TSENSE Figure 10. Precision Oscillator A programmable precision oscillator is provided. The clock oscillator serves as the master clock to the ramp generator circuit. This oscillator is programmed by a resistor to ground on the ROSC pin. The oscillator frequency range is between 200 kHz/phase to 1 MHz/phase. The ROSC pin provides approximately 2 V out and the source current is mirrored into the internal ramp oscillator. The oscillator frequency is approximately proportional to the current flowing in the ROSC resistor. NCP6121 Operating Frequency versus Rosc 6.98 kW 400 kHz Fs + ROSC (eq. 9) |
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