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L7980ATR 数据表(PDF) 4 Page - STMicroelectronics

部件名 L7980ATR
功能描述  2 A step-down switching regulator
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L7980ATR 数据表(HTML) 4 Page - STMicroelectronics

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Pin settings
L7980
4/44
Doc ID 15181 Rev 4
1
Pin settings
1.1
Pin connection
Figure 2.
Pin connection (top view)
1.2
Pin description
OUT
SYNCH
EN
COMP
VCC
GND
FSW
FB
OUT
SYNCH
COMP
VCC
GND
FSW
FB
OUT
SYNCH
EN
COMP
VCC
GND
FSW
FB
OUT
SYNCH
COMP
VCC
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.
3EN
A logical signal (active high) enable the device. With EN higher than 1.2
V the device is ON and with EN is lower than 0.3V the device is OFF.
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 0.6V. 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 250kHz.
7
GND
Ground
8VCC
Unregulated DC input voltage



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