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SPI-8010A датащи(PDF) 5 Page - Allegro MicroSystems

номер детали SPI-8010A
подробное описание детали  3 A, DC/DC Step-Down Converter
Download  9 Pages
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производитель  ALLEGRO [Allegro MicroSystems]
домашняя страница  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SPI-8010A датащи(HTML) 5 Page - Allegro MicroSystems

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SPI-8010A
3 A, DC/DC
Step-Down Converter
www.allegromicro.com
Switching
Regulators
5
APPLICATIONS INFORMATION
Input Capacitor (C1 and C7). Capacitors with low
impedance for high-frequency ripple current must be used.
Output Capacitor (C2 and C8). Capacitors with low
impedance for high-frequency ripple current must be used.
Especially when the C2 impedance is high, the switching
waveform may not be normal at low temperatures. Film or
tantalum capacitors for C2 may cause abnormal oscilla-
tions.
Catch Diode (D1). Diode D1 must be a Schottky diode.
Other diode types will result in increased forward voltage
spikes, reverse current flow, increased IC power dissipa-
tion during the off period, and possible destruction of the
IC.
Choke Coil (L1). If the winding resistance of the choke
coil is too high, the circuit efficiency will decrease. As the
overcurrent protection start current is approximately 4.5 A,
attention must be paid to the heating of the coil by magnetic
saturation due to overload. To reduce the output ripple, the
inductor may be increased at the expense of excessive
board area and cost.
Output Voltage Adjustable Resistors (R2 and R3).
The output voltage is adjusted by R2 and R3. 500
Ω for
R3 is recommended.
R2 = (V
O – Vref)/(Vref/R3)
C1
220 µF/63 V
C2
470 µF/25 V
C3
0.1 µF
C4
1000 pF
C5
0.1 µF
C6
0.047 µF
C7
0.1 µF
C8
0.1 µF
C9
6800 pF
R1
47
L1
47 µH
D1
Sanken SPB-G56S
Determination of DC Input Voltage. The minimum
value of dc input voltage is 8 V when the output is less than
5 V, VO + 3 V when the output voltage is more than 5 V.
The recommended maximum value is 50 V when the output
value is more than 2.5 V, derated linearly to 30 V when the
output is 1 V.
Typical Application


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