uc3842g-s08-t Unisonic Technologies, uc3842g-s08-t Datasheet - Page 7

• Manufacturer Part Number: uc3842g-s08-t
• Description: High Performance Current Mode Controller
• Manufacturer: Unisonic Technologies

UC3842G
We can judge the state of output load through the voltage of PIN1. In order to reduce the standby power, it will
reduce the OSC frequency at right load. When V
frequency is 52KHz, the minimum frequency is 14KHz.
Peak current (I
transients
CURRENT SENSE CIRCUIT
OSCILLATOR AND STANDBY MODE
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Frequency: 52KHz
S
Rs
) determined by the formula: I
Normal
R
Is
C
1
3
5
Error Amplifier
SMAX
COMP
OSC triangle wave
Minimum frequency :14KHz
=1V/Rs. A small RC filter be required to suppress switch
≤2.2V, the OSC frequency begins to reduce. The normal
2R
Standby mode
R
1V
LINEAR INTEGRATED CIRCUIT
Current Sense Comparator
V
COMP
Frequency: 52KHz
Normal
QW-R103-036,A
Increase
7 of 8
2.2V
1.2V