 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ISL6567 Datasheet(PDF) 8 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
ISL6567 Datasheet(HTML) 8 Page - Intersil Corporation |
|
|
8 / 26 page  8 FB and COMP (Pins 6 and 5) The internal error amplifier’s inverting input and output respectively. These pins are connected to the external network used to compensate the regulator’s feedback loop. ISEN1, ISEN2 (Pins 17, 13) These pins are used to close the current feedback loop and set the overcurrent protection threshold. A resistor connected between each of these pins and their corresponding PHASE pins determine a certain current flow magnitude during the lower MOSFET’s conduction interval. The resulting currents established through these resistors are used for channel current balancing and overcurrent protection. Use the following equation to select the proper RISEN resistor: where: rDS(ON) = lower MOSFET drain-source ON resistance (Ω) IOUT = channel maximum output current (A) Read ‘Current Loop’, ‘Current Sensing’, ‘Channel-Current Balance’, and ‘Overcurrent Protection’ paragraphs for more information. UGATE1, UGATE2 (Pins 19, 11) Connect these pins to the upper MOSFETs’ gates. These pins are used to control the upper MOSFETs and are monitored for shoot-through prevention purposes. Minimize the impedance of these connections. Maximum individual channel duty cycle is limited to 66%. BOOT1, BOOT2 (Pins 20, 10) These pins provide the bias voltage for the upper MOSFETs’ drives. Connect these pins to appropriately-chosen external bootstrap capacitors. Internal bootstrap diodes connected to the PVCC pins provide the necessary bootstrap charge. Minimize the impedance of these connections. PHASE1, PHASE2 (Pins 18, 12) Connect these pins to the sources of the upper MOSFETs. These pins are the return path for the upper MOSFETs’ drives. Minimize the impedance of these connections. LGATE1, LGATE2 (Pins 16, 14) These pins are used to control the lower MOSFETs and are monitored for shoot-through prevention purposes. Connect these pins to the lower MOSFETs’ gates. Minimize the impedance of these connections. SS (Pin 23) This pin allows adjustment of the output voltage soft-start ramp rate, as well as the hiccup interval following an overcurrent event. The potential at this pin is used as a clamp voltage for the internal error amplifier’s non-inverting input, regulating its rate of rise during start-up. Connect this pin to a capacitor referenced to ground. Small internal current sources linearly charge and discharge this capacitor, leading to similar variation in the ramp up/down of the output voltage. While below 0.3V, all output drives are turned off. As this pin ramps up, the drives are not enabled but only after the first UGATE pulse emerges (avoid draining the output, if pre-charged). If no UGATE pulse are generated until the SS exceeds the top of the oscillator ramp, at that time all gate operation is enabled, allowing immediate draining of the output, as necessary. SS voltage has a ~0.7V offset above the reference clamp, meaning the reference clamp rises from 0V with unity gain correspondence as the SS pin exceeds 0.7V. For more information, please refer to the Soft-Start paragraph. FS (Pin 22) This pin is used to set the switching frequency. Connect a resistor, RFS, from this pin to ground and size it according to the graph in Figure 1 or the following equation: PGOOD (Pin 21) This pin represents the output of the on-board power-good monitor. Thus, the FB pin is monitored and compared against a window centered around the available reference; an FB voltage within the window disables the open-collector output, allowing the external resistor to pull-up PGOOD high. Approximate pull-down device impedance is 65 Ω. While operating with an external reference, the power-good function is enabled once the MON pin amplitude exceeds its monitored threshold (typically 300mV). RISEN rDS ON () IOUT × 50 µA ------------------------------------------ = RFS 10 10.61 1.035 FSW () log ⋅ () – () = FIGURE 1. SWITCHING FREQUENCY VS. RFS VALUE 100k 200k 500k 1M 2M Switching Frequency (Hz) 10k 20k 50k 100k 200k ISL6567 ISL6567 |
Similar Part No. - ISL6567 |
|
Similar Description - ISL6567 |
|
|
|
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
