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AN1517 데이터시트(PDF) 21 Page - STMicroelectronics

부품명 AN1517
상세설명  Designing with the STEVAL-ISA089V1 high efficiency DC-DC
PDF  30 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1517 데이터시트(HTML) 21 Page - STMicroelectronics

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AN1517
Application information
30
Figure 14. Short-circuit current VIN = 25 V
Figure 15. Short-circuit current VIN = 30 V
In Figure 14 and Figure 15, for example, it can be observed that when the input voltage
increases for a given component list, the current peak increases also. The current limit is
immediately triggered but the current peak increases until the current ripple during the TOFF
is equal to the current ripple during the TON.
5.5
Application circuit
Figure 16 shows the demonstration board application circuit for the device in the SMD
version, where the input supply voltage, VCC, can range from 4.4 V to 25 V due to the rated
voltage of the input capacitor and the output voltage is adjustable from 1.235 V to VCC.
Figure 16. Demonstration board application circuit
I
L
Vout
I
LIMIT
I
L
Vout
I
LIMIT
8
2
4
5
1
7
L5972D
C1
10
μF
25V
CERAMIC
C2
100
μF
10V
VOUT=3.3V
VIN = 4.4V to 25V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 33
μH
6
D1
STPS2L25U
COMP
VCC
OUT
FB
GND
AM00027v1
L5972D



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