B3800P Просмотр технического описания (PDF) - Bay Linear

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B3800P

Switching Regulator Controller Step Up Low Voltage (BIPOLAR)

Bay Linear 

B3800

HOW TO SET THE TIME CONSTANT FOR SOFT

START AND SHORT CIRCUIT DETECTION

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 sawtooth 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 [mF]

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 [mF]

APPLICATION DIAGRAM

B3800

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

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