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參數(shù)資料
| 型號(hào)： | UPS601-D08-T |
| 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)： | 7/12頁 |
| 文件大?。?/td> | 268K |
| 代理商： | UPS601-D08-T |
UPS601
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
QW-R119-003,A
7 of 12
FUNCT IONAL DES CRIPT ION(Cont.)
(2) Switch Frequency Set
The maximum switch frequency decided by an external resistor R
T
connected between pin R
T
and ground. Then
the maximum switch frequency will depend on user requirement. The relation curve between f
SW
and R
T
as followed
FIG.5 under the condition of P
OUT
/P
OUTmax
=50%. The equation between f
SW
and R
T
as followed (1-2):
f
SW
= -0.61*R
T
+115.7--------------------------(1-2)
After R
T
connected, switch frequency is also modulated by output power P
OUT
during IC operating. So lower switch
frequency at lower load, which more and more improve IC’s efficiency at light load. Switch frequency is decreased
minimum at no load, then the UPS601 will operate at Power-Saving mode for Lower standby power. The relation
curve between f
SW
and P
OUT
/P
OUTmax
as followed FIG.4 under the condition of R
T
=75k
.
90
60
10
70
80
50
40
30
20
1% 2% 3%
6%
8%
0
9% 10%
P
OUT
/P
OUTmax
(R
T
=75K
)
f
220V
110V
5%
4%
7%
FIG.4 The relation curve between f
SW
and output power P
OUT
f
60
20
10
55
60
65
70
75
80
85
90
RT (k
)
(P
OUT
/P
OUTmax
=50%)
70
80
50
40
30
95
90
100
FIG.5 The relation curve between f
SW
and R
T
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