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LA5735MC Arkusz danych(PDF) 5 Page - ON Semiconductor

Numer części LA5735MC
Szczegółowy opis  Separately-Excited Step-Down Switching Regulator
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LA5735MC
No.A2022-5/6
Part selection and set
1. Resistors R1 and R2
R1 and R2 are resistors to set the output voltage. When the large resistance value is set, the error of set voltage
increases due to the VOS pin current. The output voltage may also increases due to the leak current of switching
transistor at light load. In consequence, it is essential to see R1 and R2 currnet to around 500
μA.
R1=
1.23V
500
μA ≈
2.4k
Ω
We recommend values in the range 2.0 to 2.4k
Ω
R2=
VOUT
1.23V
-1
× R1
The following equation gives the output voltage set by R1 and R2.
VO= (1+
R2
R1
)
× 1.23V (typ)
2. Capacitor C1, C2 and C3
The large ripple current flows through C1 and C2, so that the high-frequency low-impedance product for switching
power supply must be used. Do not use, for C2, a capacitor eith extremely small equivalent series resistance (ESR),
such as ceramic capacitor, tantalum capacitor. Otherwise, the output waveform may develop abnormal oscillation.
The C2 capacitance and ESR value stabilization conditions are as follows:
1
2
× π × C2 × ESR ≤
20kHz
C3 is a capacitor for phase compensation of the feedback loop. Abnormal oscillation may occur when the C2
capacitance value is small or the equivalent series resistance is small. In this case, addition od the capacitance of C3
enables phase compensation, contributing to stabilization of power supply.
3. Input capacitor: Effective-value current
The AC ripple currents flowing in the input capacitor is large than that in the output capacitor. The equation
expressing the effective-value current is as follows. Use the capacitor within the rated current range.
IC1=
)
IR
12
1
)
Vin
Vout
1
(
Iout
(
Vin
Vout
2
2
Δ
×
+
[Arms]
4. Output capacitor: Effective-value current
The AC ripple current flowing in the output capacitor is the triabgular wave. Therefore, its effective value is
obtained from the following equation. Select the output capacitor so that it does not exceed the allowable ripple
current value.
IC2 =
1
2
√3 ×
VOUT (VIN - VOUT)
L
× fsw × VIN
[Arms]
fsw = Switching frequency
300kHz
5. Choke coil L1
Note that choke coil heating due to overload or load shorting may be a problem.The inductance value can be
determined from the following equation once the input voltage, output voltage, and current ripple conditions are
known.
ΔIR indicates the ripple current value.
Reference example : VIN = 12V, VOUT = 5V, ΔIR = 150mA
L =
VIN - VOUT - Vsat
ΔIR
× Ton
=
12 - 5.0 - 1.0
0.15
× 1.58 × 10-6
≈ 68μH
Ton =
T
((VIN - VOUT - Vsat)/(VOUT + VF)) + 1
Toff = T - Ton
t : Switching repetition period ··· 3.33
μs is assumed for the calculation
VF : Schottky diode forward voltage0.4V is assumed for the calculation


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