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参数资料
| 型号： | 44608P40 |
| 厂商： | 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灵活二七二三六七六七高电压PWM控制器 |
| 文件页数： | 16/16页 |
| 文件大小： | 266K |
| 代理商： | 44608P40 |
MC44608
http://onsemi.com
9
EQUATION 1
Start–up Phase Duration:
tstart–up +
C
Vcc
(Vstup * UVLO2)
Istup
where: Istup is the start–up current flowing through VCC pin
CVcc is the VCC capacitor value
EQUATION 2
Switching Phase Duration:
t
switch +
C
Vcc
(Vstup * UVLO1)
I
ccS )
I
G
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:
t
latched
*off +
C
Vcc
(UVLO1
* UVLO2)
I
ccL )
I
pin3
where: IccL is the latched off phase consumption
Ipin3 is the current drawn from pin3 adding a resistor
EQUATION 4
Burst Mode Duty Cycle:
d
BM +
t
switch
tstart*up ) tswitch ) tlatched*off
EQUATION 5
d
BM +
C
Vcc
(V
stup *
UVLO1)
I
ccS)
I
G
C
Vcc
(V
stup *
UVLO2)
I
stup
)
C
Vcc
(V
stup *
UVLO1)
I
ccS)
I
G
)
C
Vcc
(UVLO1
*UVLO2)
I
ccL)
I
pin3
EQUATION 6
d
BM +
1
) k
S Stup
I
ccS)
I
G
I
stup
) k
S L
I
ccS)
I
G
I
ccL)
I
pin3
where: kS/Stup = (Vstup – UVLO2)/(Vstup – UVLO1)
kS/L = (UVLO1 – UVLO2)/(Vstup – UVLO1)
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