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參數(shù)資料
| 型號： | 44608P40 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| 中文描述： | 很少的外部元件的可靠靈活二七二三六七六七高電壓PWM控制器 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 266K |
| 代理商： | 44608P40 |
MC44608
http://onsemi.com
10
EQUATION 7
d
BM +
1
)
I
ccS)
I
G
I
stup
k
S Stup )
k
S L
I
stup
I
ccL)
I
pin3
EQUATION 8
d
BM +
1
)
k1
)
I
G
I
stup
k
S Stup )
(k
S L
1
k2
)
I
pin3
I
stup
)
where: k1 = Iccs/Istup
k2 = IccL/Istup
kS/Stup = (Vstup–UVLO2)/(Vstup–UVLO1)
kS/L = (UVLO1–UVLO2)/(Vstup–UVLO1)
PULSED MODE CURRENT SENSE CLAMPING LEVEL
Equations 9, 10, 11 and 12 allow the calculation of the Rcs value for the desired maximum current peak value during the
SMPS stand–by mode.
EQUATION 9
Ipk
stby +
V
cs–th *
(Rcs
Ics)
R
S
where: Vcs–th is the CS comparator threshold
Ics is the CS internal current source
RS is the sensing resistor
Rcs is the resistor connected between pin 2 and RS
EQUATION 10
Ipk
stby +
V
cs–th
1
* Rcs
Ics
V
cs–th
R
S
EQUATION 11
Ipk
stby +
V
cs–th
1
* (Rcs Y
cs–stby
)
R
S
where: Ycs–stby = Ics/Vcs–th
Taking into account the circuit propagation delay (
dtcs) and the Power Switch reaction time (dtps):
EQUATION 12
Ipk
stby +
V
cs–th
1
* (Rcs Y
cs–stby
)
R
S
)
V
in
(
dtcs ) dtps)
Lp
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