 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ISL6559CR Datasheet(PDF) 9 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
ISL6559CR Datasheet(HTML) 9 Page - Intersil Corporation |
|
|
9 / 21 page  9 FN9084.8 December 29, 2004 Most multi-phase controllers simply have the output voltage fed back to the inverting input of the error amplifier through a resistor. The ISL6559 features an internal differential remote-sense amplifier in the feedback path. The amplifier removes the voltage error encountered when measuring the output voltage relative to the local controller ground reference point, resulting in a more accurate means of sensing output voltage. Connect the microprocessor sense pins to the non-inverting input, VSEN, and inverting input, RGND, of the remote-sense amplifier. The remote-sense amplifier output, VDIFF, is then tied through an external resistor to the inverting input of the error amplifier. A digital to analog converter (DAC) generates a reference voltage based on the state of logic signals at pins VID4 through VID0. The DAC decodes the a 5-bit logic signal (VID) into one of the discrete voltages shown in Table 1. Each VID input offers a 20 µA pull-up to an internal 2.5V source for use with open-drain outputs. External pull-up resistors or active-high output stages can augment the pull- up current sources, but a slight accuracy error can occur if they are pulled above 2.9V. The DAC-selected reference voltage is connected to the non-inverting input of the error amplifier. The ISL6559 features a second non-inverting input to the error amplifier which allows the user to directly offset the DAC reference voltage in the positive direction only. The offset voltage is created by an internal current source which feeds out the OFS pin into a user selected external resistor to ground. The resulting voltage across the resistor, VOFS, is internally divided down by ten to create the offset voltage. This method of offsetting the DAC voltage is more accurate than external methods of level-shifting the FB pin. The integrating compensation network shown in Figure 5 assures that the steady-state error in the output voltage is limited to the error in the reference voltage (output of the DAC) plus offset errors in the OFS current source, remote- sense and error amplifiers. Intersil specifies the guaranteed tolerance of the ISL6559 to include all variations in current FIGURE 5. OUTPUT-VOLTAGE AND LOAD-LINE REGULATION - + IAVG REFERENCE EXTERNAL CIRCUIT ISL6559 INTERNAL CIRCUIT COMP CC RC RFB FB IOUT VDIFF VSEN RGND - + VDROOP ERROR AMPLIFIER - + VOUT REMOTE SENSE DIFFERENTIAL REMOTE-SENSE AMPLIFIER VOLTAGE VCOMP + OFS 1/10 100 µA ROFS OFFSET VOLTAGE - + VOFS GND POINTS TABLE 1. VOLTAGE IDENTIFICATION CODES VID4 VID3 VID2 VID1 VID0 DAC 0 0 0 0 0 1.550 0 0 0 0 1 1.525 0 0 0 1 0 1.500 0 0 0 1 1 1.475 0 0 1 0 0 1.450 0 0 1 0 1 1.425 0 0 1 1 0 1.400 0 0 1 1 1 1.375 0 1 0 0 0 1.350 0 1 0 0 1 1.325 0 1 0 1 0 1.300 0 1 0 1 1 1.275 0 1 1 0 0 1.250 0 1 1 0 1 1.225 0 1 1 1 0 1.200 0 1 1 1 1 1.175 1 0 0 0 0 1.150 1 0 0 0 1 1.125 1 0 0 1 0 1.100 1 0 0 1 1 1.075 1 0 1 0 0 1.050 1 0 1 0 1 1.025 1 0 1 1 0 1.000 1 0 1 1 1 0.975 1 1 0 0 0 0.950 1 1 0 0 1 0.925 1 1 0 1 0 0.900 1 1 0 1 1 0.875 1 1 1 0 0 0.850 1 1 1 0 1 0.825 1 1 1 1 0 0.800 1 1 1 1 1 Shutdown ISL6559 |
Similar Part No. - ISL6559CR |
|
Similar Description - ISL6559CR |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
