UTC L2800
LINEAR INTEGRATED CIRCUIT
(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.
APPLICATION EXAMPLE
18kΩ
22μH
V
O
5V
-IN
V
IN
3V
SCP
Vcc
33μF
2kΩ
BR/CTL
0.1μF
1
2
3
4
8
7
6
5
FB
OSC
GND
OUT
10μF
390Ω
270pF
3kΩ 0.1μF
CTL
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
9
QW-R121-010,A
UTC-IC [ UNISONIC TECHNOLOGIES ]
