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L4972A Arkusz danych(PDF) 9 Page - STMicroelectronics

Numer części L4972A
Szczegółowy opis  2A SWITCHING REGULATOR
PDF  22 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4972A Arkusz danych(HTML) 9 Page - STMicroelectronics

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L4972A
PART LIST
R1 = 30K
Ω
R2 = 10K
Ω
R3 = 15K
Ω
R4 = 30K
Ω
R5 = 22
Ω
R6 = 4.7K
Ω
R7 = see table 6
R8 = OPTION
R9 = 4.7K
Ω
* C1 = C2 = 1000mF 63V EYF (ROE)
C3 = C4 = C5 = C6 = 2,2
µF 50V
C7 = 390pF Film
C8 = 22nF MKT 1837 (ERO)
C9 = 2.7nF KP 1830 (ERO)
C10 = 0.33
µF Film
C11 = 1nF
** C12 = C13 = C14 = 100
µF 40V EKR (ROE)
C15 = 1
µF Film
D1 = STPS5L60
L1 = 150
µH
core 58310 MAGNETICS
45 TURNS 0.91mm (AWG 19)
COGEMA 949181
* 2 capacitors in parallel to increase input RMS current capability.
* * 3 capacitors in parallel to reduce total output ESR.
Table 6.
Note:
In the Test and Application Circuit for L4972D are not
mounted C2, C14 and R8.
Table 7. Suggested Boostrap Capacitors
V0
R9
R7
12V
4.7k
Ω
6.2k
Ω
15V
4.7k
Ω
9.1k
Ω
18V
4.7k
Ω
12
Ω
24V
4.7k
Ω
18
Ω
Operating Frequency
Boostrap Cap.c10
f = 20KHz
≥680nF
f = 50KHz
≥470nF
f = 100KHz
≥330nF
f = 200KHz
≥220nF
f = 500KHz
≥100nF



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