UC2843B
APPLICATION INFORMATION
Error amplifier (EA) configuration circuit:
LINEAR INTEGRATED CIRCUIT
2.5V
0.5mA
VFB
Z1
COMP
Z2
EA
Error
Amplifier
Note: Error amplifier can source or sink up to 0.5mA.
Current-sense circuit:
IS
(see Note A)
EA
Rf
RS
COMP
ISENSE
Cf
GND
2R
PWM
R
1V
Notes: 1. Peak current (IS) is determined by the formula: IS(max) = 1V/RS
2. A small RC filter formed by resistor RF and capacitor CF may be required to suppress switch transients.
The oscillator frequency is set using the circuit:
VREF
RT
RT/CT
CT
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 9
QW-R103-048.E