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L6985F Scheda tecnica(PDF) 5 Page - STMicroelectronics

Il numero della parte L6985F
Spiegazioni elettronici  Internal current limiting
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6985F Scheda tecnica(HTML) 5 Page - STMicroelectronics

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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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