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MAX1820 Folha de dados(PDF) 3 Page - Maxim Integrated Products |
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MAX1820 Folha de dados(HTML) 3 Page - Maxim Integrated Products |
3 / 6 page MAX1820 Evaluation Kit _______________________________________________________________________________________ 3 Operating Mode (Top and Bottom Circuits) The MAX1820 EV kit provides a jumper-selectable operating mode feature. Jumpers JU2 and JU5 select the operating mode for the top and bottom circuits, respectively. Options include Low-Noise Forced PWM mode and Normal mode. Table 2 lists the jumper options. Caution: Do not connect an external controller to the SHDN pad while a shunt is on jumper JU1 or JU4 since the external controller may be damaged. Clock Select (Top and Bottom Circuits) The MAX1820 EV kit features a selectable clock input. The MAX1820/MAX1821’s internal clock can operate the EV kit or the EV kit can be synchronized to an external clock when evaluating the MAX1820X, MAX1820Y, and MAX1821X. The 2-pin jumpers JU3 and JU6 determine the top and bottom circuits’ operating clock, respective- ly. Table 3 lists the selectable jumper options. The sine-wave generator should provide the following signal qualities: • Output Voltage = 0.2VP-P to 0.8VP-P with approxi- mately 1VDC offset • Output Frequency = 10MHz to 16MHz (MAX1820X and MAX1821X) • Output Frequency = 15MHz to 21MHz (MAX1820Y) • Duty Cycle = 40% to 60% Evaluating Other Output Voltages (Bottom Circuit) The MAX1821 buck switching-regulator output is set to +1.5V by feedback resistors (R3, R4). To generate out- put voltages other than +1.5V (+1.25V to +5.5V), select different external voltage-divider resistors (R3, R4). Refer to the Setting the Output Voltages section in the MAX1821 data sheet for instructions on selecting the resistors. The minimum input voltage must be +150mV above the selected output voltage at VOUT to avoid possible dropout conditions. Variable Output Voltage (Top Circuit) The MAX1820 EV kit top circuit uses the MAX1820Z IC and features a dynamically variable output voltage in the +0.4V to +3.4V range. An external voltage refer- ence source must be connected to the top circuit’s volt- age reference (REF) BNC connector. The reference source can be an external voltage reference or the out- put of a DAC. The range of the voltage reference is +0.227V to +1.932V. This reference voltage range will provide an output voltage in the +0.4V to +3.4V range at VOUT. The output voltage (VOUT) settles within 30µs when changing VREF. When VIN is equal or lower than the desired VOUT, the MAX1820 operates at 100% duty cycle and VOUT will track VIN. SHUNT LOCATION SKIP PIN OPERATING MODE 1, 2 Connected to VIN Forced PWM mode: PWM operation at all loads 2, 3 Connected to GND Normal mode: pulse skipping at light load and PWM at heavy load Table 2. Jumpers JU2 and JU5 Functions SHUNT LOCATION SYNC PIN OPERATING MODE Installed Connected to VIN Internal 1MHz clock used None Connected to SYNC pad through C4, C8 External 13MHz sine- wave generator used to synchronize internal clock Table 3. Jumpers JU3 and JU6 Functions |
Nº de peça semelhante - MAX1820 |
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Descrição semelhante - MAX1820 |
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