L5987A(2008) 데이터 시트보기 (PDF) - STMicroelectronics
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L5987A Datasheet PDF : 42 Pages
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Pin settings
1
Pin settings
1.1
Pin connection
Figure 1. Pin connection (top view)
OUT
SYNCH
INH
COMP
L5987 - L5987A
VCC
GND
FSW
FB
1.2
Pin description
Table 1.
N.
1
2
3
4
5
6
7
8
Pin description
Type
Description
OUT
SYNCH
INH
COMP
FB
FSW
Regulator output
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.
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.
Error amplifier output to be used for loop frequency compensation
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.
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.
GND
VCC
Ground
Unregulated DC input voltage
4/42
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