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STUSB4700 数据表(PDF) 21 Page - STMicroelectronics

部件名 STUSB4700
功能描述  Smart plugs and wall adapters
PDF  32 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STUSB4700 数据表(HTML) 21 Page - STMicroelectronics

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STUSB4700
Typical use cases
DocID030193 Rev 2
21/32
7
Typical use cases
7.1
Power supply
– buck topology
Figure 6: Power supply - buck topology
The STUSB4700 offers the possibility to have up to 5 PDOs using (GPIO0 to GPIO3).
For example PDO1:5V 3A (no GPIO grounded), PDO2:9V 3A (GPIO0 to GND), PDO3:15V
3A (GPIO1 to GND).
Depending on the contract negotiated between source and sink VBUS voltage can go up to
20 V.
VBUS = Vref x (1+ R1p / (R1+R2+R3+R4+R5))
Table 16: Resistor value
PDO
VOUT
Computation
Resistor value (ohm)
–
–
R1P
200 k
5
20
����1 =
����1����∙1.24
����������������−1.24
13 k
4
15
����2 =
����1����∙1.24
����������������−1.24
− ����1
9.53 k
3
12
����3 =
����1����∙1.24
����������������−1.24
− ����1 − ����2
41.2 k
2
9
����4 =
����1����∙1.24
����������������−1.24
− ����1 − ����2 − ����3
9.53 k
1
5
����5 =
����1����∙1.24
����������������−1.24
− ����1 − ����2 − ����3 − ����4
41.2 k



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