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H2511-01001-1-16W1 Datasheet(PDF) 2 Page - Intersil Corporation |
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H2511-01001-1-16W1 Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 9 page Application Note 1793 2 AN1793.1 December 6, 2012 3. Make sure that the setup is connected correctly. Turn on the power supply. If the board is working properly, the green LED will illuminate; if not, the red LED will illuminate (recheck the wire/jumper connections in this case). Measure the output voltages, VOUT1, which should be at 1.2V and VOUT2, which should be at 1.5V 4. If different output voltages are desired, board resistors can be exchanged to provide the desired VOUT. Please refer to Table 1 for R2/R4 resistor values, which can be used to produce different output voltages. For 12V VIN and VOUT more than 1.5V, the switching frequency will need to be adjusted, as shown in Table 1. The resistor RFSET can be adjusted for the desired frequency. 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. Please refer to the derating curves in the ISL8225M datasheet. Optional Paralleled Single Output Mode 1. To set up the parallel mode, short JP1 (ENC), JP2 (VMON) and JP3 (COMP) with a jumper. To set up 180° interleaving phase between 2 channels, short the MODE pin and GND pin of JP6 with a jumper. 2. Remove R9 and R13. Change R14 to 0Ω. Change R18 and R19 to 0Ω. Short VOUT1 to VOUT2 using short wires or copper straps. Add C2 for a 470pF capacitor. 3. Connect a power supply capable of sourcing at least 5A to the inputs BA7 (VIN1), BA8 (GND), BA3 (VIN2) and BA4 (GND) of the ISL8225MEVAL4Z evaluation board, with a voltage between 4.5V to 20V. VIN1 and VIN2 need to be shorted together. 4. Connect an electronic load or the device to be powered to the outputs BA5 (VOUT1) and BA6 (GND) of the board. All connections, especially the low voltage, high current VOUT lines, should be able to carry the desired load current and should be made as short as possible. 5. Make sure the setup is connected correctly prior to applying any power to the board. Adjust the power supply to 12V and turn on the input power supply. If the board is working properly, the green LED will illuminate; if not, the red LED will illuminate (recheck the wire/jumper connections in this case). Measure the output voltages, VOUT1, which should be at 1.2V. 6. Apply any load that is less than 30A for normal steady state operation. Refer to Table 1 to change the output voltage by changing resistor R2. Optional Cascadable Mode Cascadable mode is needed when multiple evaluation boards are used for paralleling or multiple output use. To demo the parallel features, it is recommended to use ISL8225MEVAL2Z 6-phase evaluation board for an easy and efficient setup (see AN1789). Otherwise, follow the steps shown below: 1. In order to generate CLKOUT at a shifted phase clock signal, the control loop of VOUT2 needs to be disabled by connecting VSEN2- to VCC. 2. Program MODE and VSEN2+ pin voltages to set the CLKOUT signal and the shifted degrees between two phases on the board (refer to Table 3). 3. Use a coaxial cable to connect CLKOUT (J5) to SYNC (J2) of the next evaluation board, which can be programed for parallel or dual output use. 4. If the second board is programed for parallel use, the ISHARE pins of the first and second boards need to be tied together. Using two twisted wires, short two different jumpers of JP7 (ISHARE/SGND) on two evaluation boards. Add 1nF capacitors of C14 for different boards to decouple the noise. 5. If the third board is used in cascadable mode, the second board can only be used in the parallel mode to generate the CLKOUT signal for the SYNC pin on the third board. 6. Follow the instructions from Steps 1 through 5 for more cascadable boards. Evaluation Board Information The evaluation board size is 114.3mm x 76.2mm. 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 dual 15A reference design. Refer to “Layout” on page 6. The board is made 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 designed carefully to maximize thermal performance. To achieve this, select enough trace width, copper weight and the proper connectors. This evaluation board is designed for running dual 15A at room temperature without additional cooling systems needed. TABLE 1. VALUE OF BOTTOM RESISTOR (TOP RESISTOR R1, R3 = 1kΩ) AND FREQUENCY SELECTION FOR DIFFERENT OUTPUT VOLTAGES VOUT (V) R2 /R4 ( Ω) FREQUENCY (kHz) RFSET (Ω) (VIN = 12V) 1.0 1500 DEFAULT OPEN 1.2 1000 DEFAULT OPEN 1.5 665 DEFAULT OPEN 2.5 316 650 249k 3.3 221 800 124k 5.0 137 950 82.5k 5.5 121 950 82.5k TABLE 2. BOARD CONFIGURATION FOR SINGLE OUTPUT 30A APPLICATION ENC VMON MODE COMP R9 R13 R14 Dual OPEN OPEN OPEN OPEN 0 0 OPEN Single ON ON ON ON OPEN OPEN 0 |
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