CM2596S
3A S
TEP
D
OWN
V
OLTAGE
R
EGULATOR
Note 1:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system
performance. Refer to Application Information for details.
Note 2:
The oscillator frequency reduces to approximately 11KHz in the event of fault conditions, such as output short or
overload. And the regulated output voltage will drop approximately 40% from the nominal output voltage. This self-protection
feature lowers the average power dissipation by lowering the minimum duty cycle from 5% down to approximately 2%.
Note 3:
For these parameters, FB is removed from V
OUT
and connected to +12V to force the output transistor OFF.
Note 4:
V
OUT
pin sourcing current. No diode, inductor or capacitor connect to V
OUT
.
Note 5:
FB is removed from V
OUT
and connected to 0V.
BLOCK DIAGRAM
Vin
1
150KHz
Thermal Shutdown
&
Current Limit
Requlator
With
Enable
FB
4
R2*
Oscillator
5
ENABLE
Comparator
-
+
.
+
.
.
.
.
.
.
R1*
.
-
Error Amplifier
Driver
2
Vout
1.23V
Reference
GND 3
.
Reset
2006/11/27 Rev 1.0
Champion Microelectronic Corporation
Page 4
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
