UC2843B
Preliminary
APPLICATION INFORMATION
Error amplifier (EA) configuration circuit:
LINEAR INTEGRATED CIRCUIT
2.5V
VFB
Z1
COMP
Z2
Note: Error amplifier can source or sink up to 0.5mA.
Current-sense circuit:
EA
Error
Amplifier
0.5mA
Notes: 1. Peak current (IS) is determined by the formula: IS(max) = 1 V/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
The frequency is calculated as followed:
f = 1 / RTCT
For RT > 5kΩ:
f = 1.72 / RTCT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-048.a