Datasheet

UCC284–5, UCC284–12, UCC284–ADJ, UCC384–5, UCC384–12, UCC384–ADJ
LOW-DROPOUT 0.5-A NEGATIVE LINEAR REGULATOR
SLUS234D – JANUARY 2000 – REVISED FEBRUARY 2002
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
IOUT=0A
IOUT (NOM)
IOVER
IPEAK
VOUT = 0V
VOUT
=(IPEAK)(RL)
VOUT NOM. (–V)
CT = 0V
CT (NOM) = – 1.6V
CT = – 2.6V
NOTE: CURRENT FLOW IS INTO THE DEVICE
t
ON
t
OFF
t
ON
t
OFF
t
ON
UDG–99031
~40 x t
ON
~40 x t
ON
Figure 5. Short Circuit Timing
UCC384 short circuit timing
During normal operation the output voltage is in regulation and the SD/CT pin is held to –1.5 V via a 50-kΩ
internal-source impedance. If the output-current rises above the overcurrent threshold, the CT capacitor is
charged by a 40-µA current sink. The voltage on the SD/CT pin moves in a negative direction with respect to
GND.