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L7980TR 数据表(PDF) 4 Page - STMicroelectronics |
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L7980TR 数据表(HTML) 4 Page - STMicroelectronics |
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4 / 44 page  Pin settings L7980 4/44 Doc ID 15181 Rev 4 1 Pin settings 1.1 Pin connection Figure 2. Pin connection (top view) 1.2 Pin description OUT SYNCH EN COMP VCC GND FSW FB OUT SYNCH COMP VCC GND FSW FB OUT SYNCH EN COMP VCC GND FSW FB OUT SYNCH COMP VCC GND FSW FB Table 1. Pin description N. Type Description 1 OUT Regulator output 2 SYNCH Master/Slave Synchronization. When it is left floating, a signal with a phase shift of half a period respect to the power turn on is present at the pin. When connected to an external signal at a frequency higher than the internal one, then the device is synchronized by the external signal, with zero phase shift. Connecting together the SYNCH pin of two devices, the one with higher frequency works as master and the other one as slave; so the two powers turn on have a phase shift of half a period. 3EN A logical signal (active high) enable the device. With EN higher than 1.2 V the device is ON and with EN is lower than 0.3V the device is OFF. 4 COMP Error amplifier output to be used for loop frequency compensation 5FB Feedback input. Connecting the output voltage directly to this pin the output voltage is regulated at 0.6V. To have higher regulated voltages an external resistor divider is required from Vout to FB pin. 6FSW The switching frequency can be increased connecting an external resistor from FSW pin and ground. If this pin is left floating the device works at its free-running frequency of 250kHz. 7 GND Ground 8VCC Unregulated DC input voltage |
类似零件编号 - L7980TR |
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类似说明 - L7980TR |
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