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参数资料
| 型号： | PJ3800CA |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 4/8页 |
| 文件大小： | 330K |
| 代理商： | PJ3800CA |
PJ3800
Low Voltage Switching Regulator Controller
4-8
2003/04.rev.A
1. Soft Start
At power on, the capacitor CPE connected to the SCP pin starts charging. The PWM comparator compares the soft start setting
voltage as a proportion of the voltage at the SCP pin with the saw tooth waveform. The comparison controls the ON duty of the
OUT pin, causing the soft start operation. On completion of soft start operation, the voltage at the SCP pin stays low, the soft
start setting voltage stays high, and the circuit enters the output short circuit detection wait state.
Soft start time (The time until the output ON duty reaches approximately 50%)
tS [s]
0.35 × CPE [μF]
2. Short Circuit Protection
If the switching regulator output suddenly drops due to load effect, the error amplifier output (FB pin) is fixed at VOM + and
capacitor CPE starts charging. When the voltage at the SCP pin reaches approximately 0.8V, the output pin is set low and the
SCP pin stays low.
Once the protection circuit operates, the circuit can be restored by resetting the power supply.
Short circuit detection time
tPE [s]
0.8 × CPE [μF]
DIAGRAM
HOW TO SET THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION
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