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ST662AB Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce ST662AB
Description  DC-DC converter from 5 V to 12 V, 0.03 A for Flash memory programming supply
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST662AB Fiches technique(HTML) 11 Page - STMicroelectronics

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ST662AB - ST662AC
Application circuit
11/19
7
Application circuit
Based on fast charge/discharge of capacitors, this circuit involves high di/dt values limited
only by RON of switches. This implies a critical layout design due to the need to minimize
inductive paths and place capacitors as close as possible to the device.
A good layout design is strongly recommended for noise reason. For best performance, use
very short connections to the capacitors and the values shown in Table 7
C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be
reduced to 2 µF and 1 µF, respectively, when using ceramic capacitors, but must be of 10 µF
or larger if aluminium electrolytic are chosen.
C5 must be placed as close to the device as possible and could be omitted if very low output
noise performance are not required.
Figure 15 and Figure 16 show, respectively, our EVALUATION kit layout and the relatively.
Figure 15.
KIT layout
Figure 16.
Electrical schematic


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