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L6985F Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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L6985F Scheda tecnica(HTML) 5 Page - STMicroelectronics |
5 / 65 page DocID027836 Rev 2 5/65 L6985F Pin settings 65 2 Pin settings 2.1 Pin connection Figure 2. Pin connection (top view) 2.2 Pin description Table 1. Pin description No. Pin Description 1RST The RST open collector output is driven low when the output voltage is out of regulation. The RST is released after an adjustable time DELAY once the output voltage is over the active delay threshold. 2VCC Connect a ceramic capacitor (≥ 470 nF) to filter internal voltage reference. This pin supplies the embedded analog circuitry. 3 SS/INH An open collector stage can disable the device clamping this pin to GND (INH mode). An internal current generator (4 A typ.) charges the external capacitor to implement the soft-start. 4 SYNCH/ ISKP The pin features Master / Slave synchronization in LNM (see Section 6.5 on page 45) and skip current level selection in LCM (see Section 4.5.2 on page 24). 5FSW A pull-up resistor (E24 series only) to VCC or pull-down to GND selects the switching frequency. Pinstrapping is active only before the soft-start phase to minimize the IC consumption. 6MLF A pull-up resistor (E24 series only) to VCC or pull-down to GND selects the low noise mode/low consumption mode and the active RST threshold. Pinstrapping is active only before the soft-start phase to minimize the IC consumption. 7 COMP Output of the error amplifier. The designed compensation network is connected at this pin. 8DELAY An external capacitor connected at this pin sets the time DELAY to assert the rising edge of the RST o. c. after the output voltage is over the reset threshold. If this pin is left floating, RST is like a Power Good. 9 FB Inverting input of the error amplifier 10 SGND Signal GND 11 PGND Power GND |
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