Precautions – Epson Power Supply S1F70000 User Manual

Page 222

S1F77200Y Series

5–22

EPSON

S1F70000 Series

Technical Manual

S1F

77210Y

PRECAUTIONS

Short cut current on the S1F77210 (CMOS output voltage detector)

Since the S1F77200Y series employs CMOS output, as an input voltage nears the detection voltage range, short cut
current is flown between V

and V

. The short cut current is voltage sensitive, and approximately 2 mA flows at

5V level or so (our products are not check for short cut current after volume production has been started).
Although duration of the short cut current depends on operating conditions (such as type the circuit used and supply
impedance), normally it is assumed to continue several usec to several dozens of usec.
If a load with high impedance is inserted across the power supply, oscillation can be introduced by the short cut
current. In order to reject this trouble, the following measures should be considered:
(1) Reduce the resistance value.
(2) Insert a capacitor.
(3) Replace with the S1F77200Y series (it employs N-channel open drain approach).