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L5981TR Datasheet(PDF) 3 Page - STMicroelectronics |
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L5981TR Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 37 page  Pin settings L5981 3/37 1 Pin settings 1.1 Pin connection Figure 2. Pin connection (top view) 1.2 Pin description OUT SYNCH INH COMP V CC GND FSW FB OUT SYNCH INH COMP V CC 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. 3INH A logical signal (active high) disable the device. With INH higher than 1.9 V the device is OFF and with INH lower than 0.6 V the device is ON. 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 0.6 V. 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 250 kHz. 7 GND Ground 8VCC Unregulated DC input voltage |
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