Electronic Components Datasheet Search |
|
H1065-00107-6R3V20-T Datasheet(PDF) 2 Page - Intersil Corporation |
|
H1065-00107-6R3V20-T Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 7 page Application Note 1790 2 AN1790.0 December 3, 2012 For 12V VIN, and VOUT more than 1.5V, the switching frequency will need to be adjusted, as shown in Table 1; no frequency adjustments are necessary for VOUT below 1.5V. For 5V VIN, the frequency does not need to be adjusted and the module default frequency can be used at any allowed VOUT. If the output voltage is set to more than 1.8V, the output current will need to be derated to allow for safe operation at elevated ambient temperatures. Please refer to the derating curves in the ISL8225M datasheet. For VIN < 5.5V, please tie VIN directly to VCC for best efficiency. Also, it is preferred that the EN/FF voltage be over 1.5V in order to achieve better stability. Evaluation Board Information The evaluation board size is 3 inch x 3 inch. It is a 4-layer board, containing 2-ounce copper on the top and bottom layers and 1-ounce copper on all internal layers. The board can be used as a 30A reference design. Refer to the “Layout” section beginning on page 4. The board is made up of FR4 material and all components, including the solder attachment, are lead-free. Thermal Considerations and Current Derating For high current applications, board layout is very critical in order to make the module operate safely and deliver maximum allowable power. To carry large currents, the board layout needs to be carefully designed to maximize thermal performance. To achieve this, select enough trace width, copper weight and the proper connectors. This evaluation board is designed for running 30A @ 1.2V at room temperature without additional cooling systems needed. However, if the output voltage is increased or the board is operated at elevated temperatures, then the available current is derated. Refer to the derated current curves in the datasheet to determine the output current available. For layout of designs using the ISL8225M, the thermal performance can be improved by adhering to the following design tips: 1. Use the top and bottom layers to carry the large current. VOUT1, VOUT2, Phase 1, Phase 2, PGND, VIN1 and VIN2 should have large, solid planes. Place enough thermal vias to connect the power planes in different layers under and around the module. 2. Phase 1 and Phase 2 pads are switching nodes that generate switching noise. Keep these pads under the module. For noise-sensitive applications, it is recommended to keep phase pads only on the top and inner layers of the PCB; do not place phase pads exposed to the outside on the bottom layer of the PCB. To improve the thermal performance, the phase pads can be extended in the inner layer, as shown in Phase 1 and Phase 2 pads on layer 3 (Figure 6) for this 30A evaluation board. Make sure that layer 2 and layer 4 have the GND layers to cover the extended areas of phase pads at layer 3 to avoid noise coupling. 3. To avoid noise coupling, we recommend adding 470pF capacitors on all COMP pins of each module for multiple module operations. 4. If the ambient temperature is high or the board space is limited, airflow is needed to dissipate more heat from the modules. A heat sink can also be applied to the top side of the module to further improve the thermal performance (heat sink recommendation: Aavid Thermalloy, part number 375424B00034G, www.aavid.com). TABLE 1. RESISTANCE SETTING FOR DIFFERENT OUTPUT VOLTAGES AND OPERATING FREQUENCY (R3 = 1k) VOUT (V) RVSET ( Ω) FREQUENCY (kHz) RFSET (Ω) (VIN = 12V) 1.0 1500 Default Default 1.2 Default Default Default 1.5 665 Default Default 2.5 316 650 249k 3.3 221 800 124k 5.0 137 950 82.5k 5.5 121 950 82.5k |
Similar Part No. - H1065-00107-6R3V20-T |
|
Similar Description - H1065-00107-6R3V20-T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |