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UC3848G-S08-R Datasheet(PDF) 5 Page - Unisonic Technologies

Part No. UC3848G-S08-R
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3848G-S08-R Datasheet(HTML) 5 Page - Unisonic Technologies

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UC3848
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 11
www.unisonic.com.tw
QW-R103-033.F
FUNCTIONAL DESCRIPTION
The internal reference voltages and bias circuit work at VCC> VTHD (ON), and shutdown at VCC<VCC (MIN).
(1) Soft-Start
When every IC power on, driver output duty cycle will be decided by voltage VSS on soft-start capacitor and VCS
on current sense resistor at beginning. After VSS reach 4.2V, the whole soft-start phase end, and driver duty cycle
depend on VFB and VCS. The relation among VSS, VFB and VOUT as followed FIG.3.
Furthermore, soft-start phase should end before VCC reach VCC (MIN) during VCC power on. Otherwise, if soft-start
phase remain not end before VCC reach VCC (MIN) during VCC power on, IC will enter auto-restart phase and not set up
VOUT. So the value of CSS should be between 0.1μFand 4.7μF.
Finally soft-start also set OVP1 active phase. OVP1 active phase between 0 and VSS(DEACT), OVP1 will not be
sensed after VSS reach VSS(DEACT).The Soft-start phase TSS:TSS = 23.8×CSS (ms) (Example: CSS=0.47μF, then
TSS=23.8×0.47=11.2ms).
FIG.3 Soft-start phase


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