MC44608P100 ON Semiconductor, MC44608P100 Datasheet - Page 10

• Manufacturer Part Number: MC44608P100
• Description: IC PWM FLYBCK ISO VM 8DIP
• Manufacturer: ON Semiconductor

Specifications of MC44608P100

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 110kHz
• Duty Cycle: 86%
• Voltage - Supply: 6.6 V ~ 13 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -25°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency-max: 110kHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MC44608P100OS

EQUATION 7
EQUATION 8
where: k1 = I
k2 = I
k
k
SMPS stand−by mode.
EQUATION 9
where: V
I
R
R
EQUATION 10
EQUATION 11
where: Y
Taking into account the circuit propagation delay (dt
EQUATION 12
cs
S/Stup
S/L
S
cs
Equations 9, 10, 11 and 12 allow the calculation of the Rcs value for the desired maximum current peak value during the
is the CS internal current source
is the sensing resistor
is the resistor connected between pin 2 and R
= (UVLO1−UVLO2)/(V
ccL/
d
d
Ipk
Ipk
Ipk
Ipk
BM
BM
= (V
I
cs−th
cs−stby
stby
stby
stby
stby
stup
+
+
stup
ccs
+
+ V
+ V
+
is the CS comparator threshold
1 )
1 )
−UVLO2)/(V
/I
= I
stup
V
cs
cs–th
cs–th
cs–th
V
I
/V
cs–th
ccS
I
cs−th
k1 )
stup
* (R cs
) I
R
stup
1 * R cs
1 * (R cs
stup
G
S
I
1 * (R cs
stup
I
PULSED MODE CURRENT SENSE CLAMPING LEVEL
G
−UVLO1)
−UVLO1)
k
I cs )
S Stup
R
R
S
S
R
Y
k
S
cs–stby
S Stup
V
Y
cs–th
cs–stby
I cs
1
)
1
)
k
) (k
S
S L
)
cs
http://onsemi.com
) and the Power Switch reaction time (dt
S L
)
MC44608
V
I
ccL
in
10
I
k2)
stup
) I
(dt cs ) dt ps )
pin3
L p
1
I
I
pin3
stup
)
ps
):