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L7985 Datasheet(PDF) 4 Page - STMicroelectronics

No. de pieza L7985
Descripción Electrónicos  Voltage feed-forward
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
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L7985 Datasheet(HTML) 4 Page - STMicroelectronics

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Pin settings
L7985
4/42
DocID022446 Rev 7
1
Pin settings
1.1
Pin connection
Figure 2. Pin connection (top view)
1.2
Pin description
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 power 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.


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