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LA5774MC-BE Datenblatt(PDF) 4 Page - ON Semiconductor

Teilenummer LA5774MC-BE
Bauteilbeschribung  Switching Regulator
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LA5774MC-BE Datenblatt(HTML) 4 Page - ON Semiconductor

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LA5774MC
No.A2191-4/6
1.5V
0.62V
PWM wave
Application Circuit Example
Description of Functional Settings
1. Calculation equation to set the output voltage
This IC controls the switching output so that the VOS pin voltage becomes 1.26V (typ).
The equation to set the output voltage is as follows:
The VOS pin has the inrush current of 1
μA (typ). Therefore, the error becomes larger when R1 and R2 resistance
values are large.
2. Start delay function
The SS pin has the internally-connected 22
μA (typ) constant-current supply. When the voltage of SS pin exceeds the
threshold voltage, the regulator starts operation. As the threshold voltage is 0.62V (typ), the start delay time can be
calculated as follows:
ex. For setting at 1
μF
3. Soft start function
The internal PWM waveform has the voltage value as shown in the right.
If down-conversion from the voltage of VIN = 15 V to VIN = 3.3V is to be
made, for example, the PWM-ON duty has the value as shown below.
(Note that calculation is made with Vsat = 1V and VF = 0.2V)
The output voltage of error amplifier, which is 3.3 V, is the value with PWM = 25%, as calculated in the above
equation, so that this voltage is determined as follows:
Ver = (
ΔVPWM) × PWMduty + VPWML = 0.88V × 0.25 + 0.62V = 0.84V
(
ΔVPWM is the PWM amplitude value or 0.88V(typ) while VPWML is the lower limit voltage of PWM
waveform or 0.62V(typ))
VIN
SWOUT
VOS
GND
SS
R1
R2
LA5774MC
C3
L1
C1
C4
D1
C2
VO = 1+
× 1.26V(typ)
R2
R1
Td =
=
= 28.2 ms
C
× V
i
1
μF × 0.62
22
μA
PWMduty =
= 25 %
VOUT + VF
VIN − Vsat + VF


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