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LTC2975 数据表(PDF) 9 Page - Linear Technology |
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LTC2975 数据表(HTML) 9 Page - Linear Technology |
9 / 26 page 9 dc2022af DEMO MANUAL DC2022A Figure 4. Sequencing Output Channels with DC2022A Using TON_DELAY and TOFF_DELAY Figure 5. TON_DELAY Configuration Figure 6. TOFF_DELAY Configuration common Demo BoarD operations clear faults (CF) icon in the GUI. After clearing faults, the system tree may remain yellow if any non-volatile fault logs are present. For further information, see the Working with the Fault Log section. Resetting the DC2022A A reset pushbutton is provided on the board. To reset all devices on the DC2022A board and reload the EEPROM contents into operating memory (RAM), press RESET (SW1) on the DC2022A. DC2022A LEDs EachindividualchannelonDC2022Aalsohasitsowngreen power good LED (CH0 through CH3). When USB power (DC1613 Controller) or external power (6V to 14V jack) is applied, the +5V green LED will illuminate, indicating that the LTC2975 power system manager is powered. The red LEDs will illuminate when an alert or a fault has occurred. Sequencing Output Channels The LTC2975 has been pre-configured with different TON_DELAY values for each channel. The TON_DELAY parameterisappliedtoeachdevicerelativetotherespective CONTROLpin. Whenmultipledemoboardsareconnected together, all CONTROL pins are wire OR’d. Therefore the TON delays are enforced relative to one edge. The same applies to TOFF_DELAY values. When the CONTROL switch is set to the OFF position, all rails will power down sequentially based on each of the device’s TOFF_DELAY values. Figure 4 shows an oscilloscope screen capture of three output rails sequencing up and down in response to the CONTROL pin. Each channel has an LED which visually indicates if the channel has power. When the CONTROL pin is switched on and off, you will observe the relative on/off timing of the 4 channels. For the LTC2975, the TON_DELAY and TOFF_DELAY values are limited to 655ms. CONTROL CH2, 2.5V CH1, 1.8V CH0, 1.5V |
类似零件编号 - LTC2975 |
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类似说明 - LTC2975 |
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