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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： | 7/8页 |
| 文件大小： | 330K |
| 代理商： | PJ3800CA |
PJ3800
Low Voltage Switching Regulator Controller
7-8
2003/04.rev.A
3. Other Functions
(1) Soft start and short circuit detection
Soft start operation is set by connecting capacitor CPE to the SCP pin (pin 2). Soft start prevents a current spike on start-up.
On completion of soft start operation, the SCP pin (pin 2) stays low and enters the short circuit detection wait state. When an
output short circuit occurs, the error amplifier output is fixed at VOM+ and capacitor CPE starts charging. After charging to
approximately 0.8 V, the output pin (pin 5) is set low and the SCP pin (pin 2) stays low.
Once the protection circuit operates, the circuit can be restored by resetting the power supply. (See “n HOW TO SET THE TIME
CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION”.)
(2) Circuit to prevent malfunction at low input voltage
Transients when powering on or instantaneous glitches in the supply voltage can lead to malfunction of the control IC and cause
system damage or failure. The circuit to prevent malfunction at low input voltage detects a low input voltage by comparing the
supply voltage to the internal reference voltage. On detection, the circuit fixes the output pin to low.
The system recovers when the supply voltage rises back above the threshold voltage of the malfunction prevention circuit.
1. Do not apply an input voltage greater than the maximum rating.
Do not input voltages greater than the maximum rating as this can cause damage to the LSI
2. Use in accordance with the recommended operating conditions.
The electrical characteristics of the LSI are not guaranteed if the input voltage is greater than the maximum. Also, LSI operation is
unstable if the input voltage is less than the minimum. Therefore, always use in accordance with the recommended operating
conditions.
3. Use a wide ground line on the printed circuit board.
As the LSI uses a high frequency and therefore can generate high frequency noise, make the ground line as wide as possible.
4. Take anti-static precautions.
Use a holder for inserting the semiconductor which is anti-static or conductive.
After mounting the device on a printed circuit board, store or transport the board in a conductive bag or container.
Earth work benches, tools, and measuring equipment.
Ensure that maintenance personnel have a resistance of 250 kW to 1 MW in series between their body and earth.
APPLICATION EXAMPLE
USAGE PRECAUTIONS
PJ3800
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