Datasheet

Primary
Powerand
Switches
Power
Transformer
ToSupply
Monitor
ToPWM
Controller
RFCoupling
Transformer
STATUS
DRIVERB
DRIVERA
U2901
EXTCLK
CT
Oscillator
X4
10%
-/+
+/-
E/A
1.5V
Reference
RT
V
IN
-
+
V
IN
COMP
INV
NI
VREF
GND
Supply
Output
SUPPLY
CURRENT
PRIMARY POWER
ANDSWITCHES
POWER
TRANSFORMER
TO
SUPPLY
MONITOR
TOPWM
CONTROLLER
OPTICAL
COUPLER
STATUS
DRIVERB
DRIVERA
EXTCLK
CT RT
OSCILLATOR
1.5V
REFERENCE
10%
X4
E/A
-
+
-/+
+/-
UC2901
V
IN
COMP
INV
NI
VREF
GND
V
IN
UC2901-EP
SLUS709A DECEMBER 2006REVISED MARCH 2010
www.ti.com
Figure 5. Feedback-Coupled at Switching Frequency
Figure 6. Optically-Coupled DC Feedback
6 Submit Documentation Feedback Copyright © 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): UC2901-EP