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AN938 데이터시트(PDF) 31 Page - STMicroelectronics

부품명 AN938
상세설명  The L4973 family is a 3.5 A monolithic DC-DC converter
PDF  33 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN938 데이터시트(HTML) 31 Page - STMicroelectronics

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AN938
Applications
Doc ID 5410 Rev 10
31/33
In inverting buck-boost topology the lower voltage rail of the device floats with the negative
output voltage. The voltage applied to the device is equal to (VIN + |VOUT|) whose upper limit
is given by the maximum input voltage range of the device (55 V).
Figure 42.
Negative output voltage
4.6
Negative boost converter
Figure 43 shows how to stabilize a negative output voltage higher than negative input
voltage.
Figure 43.
Negative boost converter.
AM03524v1
L4973
VCC
-Vo
L
2,3
9
ROSC
CIN1
CIN
CBOOT
COUT
R1
R2
COSC
CSS
D
7,8
Rc
Cc
12
11
4,5,6
13,14,15
17
1
VCCMax = 55 -⏐VO⏐
VFB
AM03525v1
L4973
-VCC
VCC
GND
VFB
R1
R2
8V
≤|V
OUT|≤55V
OUT
L
OSC
D
CIN
ROSC
COSC
CBOOT
COUT
2,3
12
7,8
|VCC|<|VOUT|



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