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ADD8754-EVAL датащи(PDF) 3 Page - Analog Devices |
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ADD8754-EVAL датащи(HTML) 3 Page - Analog Devices |
3 / 12 page ADD8754-EVAL Rev. A | Page 3 of 12 EVALUATION BOARD HARDWARE QUICK START INSTRUCTIONS Follow these steps to begin using the ADD8754 evaluation board: 1. Connect ground to at least one of the 10 pins labeled GND. 2. Connect a 5 V power supply to at least one of the two pins labeled VIN. 3. Apply a 2.5 V to 5 V digital control signal on VFLK. This control signal determines when VGH_M is at GPM_H or GPM_L. See the Gate Pulse Modulator section to determine a typical waveform. After these steps are completed, users can probe the precon- figured output voltages and waveforms. FACTORY SETTINGS The ADD8754-EVAL arrives fully assembled and ready to use. The factory voltage settings are detailed in Table 1. See the Quick Start Instructions section for power-up instructions. Table 1. Factory Settings Test Point Value1 Description BOOST_OUT2 9.8 V Step-up output voltage LDO_OUT 3.3 V LDO output voltage VCOM 4.9 V VCOM output voltage VGH_M 28 V Gate pulse modulation output VDD_1 9.8 V GPM low ramp voltage VGL −5 V Gate low voltage 1 Actual voltages may differ slightly (±3%). 2 Soft start time is 100 μs when VIN = 5 V and 500 μs when VIN = 3.3 V. JUMPER SELECTION The jumper pins are listed and described in this section. JP1—SHDN Control If the JP1 jumper is shorted, the SHDN pin is shorted to ground, causing the ADD8754 to shut down. When the jumper is opened, the ADD8754 continues to operate normally. If external shutdown control is desired, remove this jumper. JP2—FREQ Select If the JP2 jumper is shorted, the ADD8754 operates at a 650 kHz internal switching frequency. If this jumper is open, the device operates at 1.2 MHz. See the ADD8754 data sheet for details. JP3—LDO Output Select The JP3 jumper has three positions (3.3 V, 2.85 V, and 2.5 V) for setting the LDO output voltage. Table 2 illustrates the proper jumper configuration. Table 2. LDO Output Voltage Jumper Selection Jumper Position Description Short Pin 2 and Pin 3 LDO_OUT = 3.3 V, see Figure 2. Open all pins LDO_OUT = 2.85 V, see Figure 3. Short Pin 1 and Pin 2 LDO_OUT = 2.5 V, see Figure 4. JP3 Figure 2. JP3 Short Pin 2 and Pin 3 JP3 Figure 3. JP3 Open All Pins JP3 Figure 4. JP3 Short Pin1 and Pin 2 JP4—VCOM Buffer Mode When the JP4 jumper is shorted, the VCOM negative input and output are shorted together. This configures VCOM as a unity gain buffer. Remove this jumper if external VCOM feedback is desired. JP5—VDPM from Step-Up When the JP5 jumper is shorted, the step-up output connects to VDPM. This enables GPM and requires no external signal on VDPM. Remove this jumper if an external VDPM control is desired. JP6—VCOM Supply from Step-Up When the JP6 jumper is shorted, the VCOM supply (VDD_2) is connected to the step-up output. This eliminates the need for an external VCOM supply voltage. If the use of an external VCOM power supply is desired, remove this jumper and connect a power supply to VDD_2. JP7—VGH from Positive Charge Pump When the JP7 jumper is shorted, GPM receives its VGH voltage from the positive charge pump. If an external VGH voltage is desired, remove this jumper to drive the VGH pin externally. |
Аналогичный номер детали - ADD8754-EVAL |
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Аналогичное описание - ADD8754-EVAL |
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