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L7980 データシート(PDF) 37 Page - STMicroelectronics

部品番号 L7980
部品情報  2 A step-down switching regulator
PDF  44 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7980 データシート(HTML) 37 Page - STMicroelectronics

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L7980
Application ideas
Doc ID 15181 Rev 4
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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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