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LA5774MC-BE Datenblatt(PDF) 4 Page - ON Semiconductor |
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LA5774MC-BE Datenblatt(HTML) 4 Page - ON Semiconductor |
4 / 6 page 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 |
Ähnliche Teilenummer - LA5774MC-BE |
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Ähnliche Beschreibung - LA5774MC-BE |
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