參數(shù)資料
型號: L7980TR
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFPN-8
文件頁數(shù): 31/44頁
文件大?。?/td> 1247K
代理商: L7980TR
L7980
Application ideas
Doc ID 15181 Rev 3
37/44
Figure 34.
Maximum output current according to max DC switch current (2.0 A):
VO=12 V
Equation 37
where VD is the voltage drop across diodes, VSW and VSWE across the internal and external
power MOSFET.
7.2
Inverting buck-boost
The L7980 can implement the step up/down converter with a negative output voltage.
Figure 33. shows the schematic to regulate -5 V: no further external components are added
to the standard buck topology.
The relationship between input and output voltage is:
Equation 38
So the duty cycle is:
Equation 39
D
V
OUT
2V
D
+
V
IN
V
SW
V
SWE
V
OUT
2V
D
++
--------------------------------------------------------------------------------------------
=
V
OUT
V
IN
D
1D
-------------
=
D
V
OUT
V
OUT
V
IN
------------------------------
=
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