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參數資料
| 型號： | MC44608P75 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 82 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 266K |
| 代理商： | MC44608P75 |
MC44608
http://onsemi.com
9
EQUATION 1
Start–up Phase Duration:
tstart–up
CVcc
(Vstup
Istup
UVLO2)
where: Istup is the start–up current flowing through VCC pin
CVcc is the VCC capacitor value
EQUATION 2
Switching Phase Duration:
tswitch
CVcc
(Vstup
IccS
UVLO1)
IG
where: IccS is the no load circuit consumption in switching phase
IG is the current consumed by the Power Switch
EQUATION 3
Latched–off Phase Duration:
tlatched
off
CVcc
(UVLO1
IccL
UVLO2)
Ipin3
where: IccL is the latched off phase consumption
Ipin3 is the current drawn from pin3 adding a resistor
EQUATION 4
Burst Mode Duty Cycle:
dBM
tswitch
tswitch
tstart
up
tlatched
off
EQUATION 5
dBM
CVcc
(Vstup
IccS
(Vstup
IccS
UVLO1)
IG
CVcc
(Vstup
Istup
UVLO2)
CVcc
UVLO1)
IG
CVcc
(UVLO1
IccL
UVLO2)
Ipin3
EQUATION 6
dBM
1
1
kS Stup
IccS
IG
Istup
kS L
IccS
IccL
IG
Ipin3
where: kS/Stup = (Vstup – UVLO2)/(Vstup – UVLO1)
kS/L = (UVLO1 – UVLO2)/(Vstup – UVLO1)
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