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L7986TR Arkusz danych(PDF) 4 Page - STMicroelectronics |
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L7986TR Arkusz danych(HTML) 4 Page - STMicroelectronics |
4 / 43 page Pin settings L7986 4/43 DocID022450 Rev 6 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 VCC OUT SYNCH EN COMP VCC GND FSW FB CC VFQFPN10 HSOP8 Table 1. Pin description No. (VFQFPN) No. (HSOP) Type Description 1 - 2 1 OUT Regulator output 3 2 SYNCH Master/slave synchronization. When it is left floating, a signal with a phase shift of half a period, with 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, the device is synchronized by the external signal, with zero phase shift. Connecting together the SYNCH pin of two devices, the one with a higher frequency works as master and the other one as slave; so the two powers turn-ons have a phase shift of half a period. 43 EN A logical signal (active high) enables the device. With EN higher than 1.2 V the device is ON and with EN lower than 0.3 V the device is OFF. 54 COMP Error amplifier output to be used for loop frequency compensation. 65 FB Feedback input. By connecting the output voltage directly to this pin the output voltage is regulated at 0.6 V. To have higher regulated voltages an external resistor divider is required from Vout to the FB pin. 76 FSW The switching frequency can be increased connecting an external resistor from the FSW pin and ground. If this pin is left floating, the device works at its free-running frequency of 250 KHz. 8 7 GND Ground 9 - 10 8 VCC Unregulated DC input voltage. |
Podobny numer części - L7986TR |
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Podobny opis - L7986TR |
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