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UC3842GP-S08-R Fiches technique(PDF) 6 Page - Unisonic Technologies

No de pièce UC3842GP-S08-R
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLER
PDF  7 Pages
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Fabricant  UTC [Unisonic Technologies]
Site Internet  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3842GP-S08-R Fiches technique(HTML) 6 Page - Unisonic Technologies

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UC3842G
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 7
www.unisonic.com.tw
QW-R103-036.D
CURRENT SENSE CIRCUIT
5
3
1
2R
R1V
C
Rs
R
Is
Error Amplifier
Current Sense Comparator
Peak current (IS) determined by the formula: ISMAX=1V/Rs. A small RC filter be required to suppress switch
transients.
OSCILLATOR AND STANDBY MODE
We can judge the state of output load through the voltage of Pin 1. In order to reduce the standby power, it will
reduce the OSC frequency at right load. When VCOMP≤2.2V, the OSC frequency begins to reduce. The normal
frequency is 52KHz, the minimum frequency is 22KHz.
2.2V
1.2V
Standby mode
Minimum frequency :14KHz
Normal
Frequency: 52KHz
Normal
Frequency: 52KHz
VCOMP
Increase
OSC triangle wave



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