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U3848BL-D08-T Datasheet(PDF) 7 Page - Unisonic Technologies

Part # U3848BL-D08-T
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

U3848BL-D08-T Datasheet(HTML) 7 Page - Unisonic Technologies

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U3848/A/B/C
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 13
www.unisonic.com.tw
QW-R103-033,B
FUNCTIONAL DESCRIPTION
The internal reference voltages and bias circuit work at VCC>12.6V, and shutdown at VCC< 8.1V.
(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 5.1V, 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, here soft-start phase Tsoft-start
should more than VOUT start-up phase Tstart-up, otherwise, IC will enter false OLP protection state. Because after the
soft-start phase end, if VOUT remain in lower voltage, VFB more than 4.6V, then IC enter false OLP state.
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.
Finally soft-start also set OVP active phase. OVP active phase between VSS=0 and VSS=3.8V, OVP will not be
sensed after VSS reach 3.8V.The Soft-start phase TSS：
6 ms
(CSS=0.05uF)
TSS =
12 ms
(CSS=0.1uF)
120 ms
(CSS=1uF)
t
VOUT
VFB
t
t
Driver
4.6V
TSTRAT-UP
VSS
t
5.1V
TSOFT-START
FIG.3 Soft-start phase


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