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參數(shù)資料
| 型號： | UPS602 |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE POWER SWITCH |
| 中文描述： | 高性能電流模式電源開關(guān) |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 268K |
| 代理商： | UPS602 |
UPS602
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
QW-R119-005,A
6 of 12
FUNCT IONAL DES CRIPT ION
The internal reference voltages and bias circuit work at V
CC
>12.6V, and shutdown at V
CC
< 8.1V.
(1) Soft-Start
When every IC power on, driver output duty cycle will be decided by voltage V
SS
on soft-start capacitor and V
CS
on
current sense resistor at beginning. After V
SS
reach 5.1V, the whole soft-start phase end, and driver duty cycle
depend on V
FB
and V
CS
. The relation among V
SS
, V
FB
and V
OUT
as followed FIG.3, here soft-start phase T
soft-start
should more than V
OUT
start-up phase T
start-up
, otherwise, IC will enter false OLP protection state. Because after the
soft-start phase end, if V
OUT
remain in lower voltage, V
FB
more than 4.6V, then IC enter false OLP state.
Furthermore, soft-start phase should end before V
CC
reach V
CC(MIN)
during V
CC
power on. Otherwise, if soft-start
phase remain not end before V
CC
reach V
CC(MIN)
during V
CC
power on, IC will enter auto-restart phase and not set up
V
OUT
.
Finally soft-start also set OVP active phase. OVP active phase between V
SS
=0 and V
SS
=3.8V, OVP will not be
sensed after V
SS
reach 3.8V.The Soft-start phase T
SS
6 ms (C
SS
=0.05uF)
T
SS
= 12 ms (C
SS
=0.1uF)
120 ms (C
SS
=1uF)
t
V
OUT
V
FB
t
t
Driver
4.6V
T
STRAT-UP
V
SS
t
5.1V
T
SOFT-START
FIG.3 Soft-start phase
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| UPS602_11 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE POWER SWITCH |
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| UPS603 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE POWER SWITCH |
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