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參數(shù)資料
| 型號(hào)： | LA5772 |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, ZFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 66K |
| 代理商： | LA5772 |
LA5772
No.A0719-4/5
Td =
=
= 28.2 msec
C
× V
i
1
× 0.62
22
Tss =
=
C
× VPWM × PWMduty
i
C
× 0.88 × PWMduty
22
A
PWMduty =
= 27%
VOUT +VF
VIN - Vsat + VF
Tss =
= 10.8msec
1
× 0.88V × 0.27
22
A
Description of Functional Settings
1.Start delay function
The SS pin has the internally-connected 22
A (typ) constant-current supply. When the voltage of SS pin exceeds the
threshold voltage, the regulator starts operation. As the threshold is 0.62V(typ), the start delay time can be calculated
as follows:
ex. For setting at 1
F
2.Soft start function
The internal PWM waveform has the voltage value as shown in the right.
If down-conversion from the voltage of VIN=20V to 5V output 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 5V, is the value with PWM=27%, as calculated in the above equation,
so that this voltage is determined as follows:
Ver = (
VPWM) × PWMduty + VPWML = 0.88V × 0.27 + 0.62V=0.86V
(
VPWM is the PWM amplitude value or 0.88V(typ) while VPWML is the lower limit voltage of PWM
waveform or 0.62V(typ))
SS pin and error amplifier output voltages are designed to prefer the lower voltages, so that VOUT will reach the
designed regulation voltage in timing when the SS pin voltage exceeds the error amplifier output. Therefore, the soft
strt time is calculated as follows:
For the set conditions of C=1
F and PWMduty=27%:
1.5V
0.62V
PWM wave
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