MC33260DG ON Semiconductor, MC33260DG Datasheet - Page 17

• Manufacturer Part Number: MC33260DG
• Description: IC PFC CONTROLLER DCM 8SOIC
• Manufacturer: ON Semiconductor
• Series: GreenLine™r

Specifications of MC33260DG

• Mode: Discontinuous Conduction (DCM)
• Current - Startup: 100µA
• Voltage - Supply: 11 V ~ 16 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAIN DESIGN EQUATIONS
3. The preconverter design requires the following characteristics specification:
rms Input Current (I
Maximum Inductor Peak Current ((I
Output Voltage Peak to Peak 100Hz (120Hz) Ripple ((ΔVo)pk--pk):
Inductor Value (L
Maximum Power MOSFET Conduction Losses ((p
Maximum Average Diode Current (I
Current Sense Resistor Losses (pR
Over Current Protection Resistor (R
Oscillator External Capacitor Value (C
--Traditional Operation
-- Follower Boost:
Feedback Resistor (R
-- (V
-- (ΔV
-- P
-- V
-- V
-- V
ac
acLL
o
FB
o
: desired output power
)
: ac rms operating line voltage
o
reg
: Feedback Pin voltage
)
: minimum ac rms operating line voltage
pk--pk
: desired output voltage regulation level
(P on ) max ≈ 1
: admissible output peak to peak ripple voltage
p
):
C
ac
T
)
o
):
≥ − C
V o =
L p =
R o =
(ΔV o )
3
pR cs = 1
(I
× (Rds)on × (I
pk
R o
2 × t ×
int
2
R
pk–pk
(V o ) reg − V
) max =
(Note 3)
OCP
+
×
(I
pk
d
d
cs
V o × V
6
OCP
2 × K osc × L p × (P

I
):
I ac =
) max =
regH
)max):
):
× (Rds)on × (I
T
=
≈

):
):
K osc × L p × P
V o

2 × 2
2π × f ac × C o × V o
R cs × (I
2
acLL
η × V ac
C
− V
FB
pk
T
η × V
 × (P
P o
(P o ) max
) max
(V o ) min
0.205
≈
+ C
acLL
× (I
pk
200
on
V o
P o
acLL
int
2
)max):
) max
V
pk

pk
×
o ) max
2
ac
× V
) max
)
in

2
in
http://onsemi.com
1 −
max
× V
) max × I
acLL
pk
1.2 × V
2
V o
17
2
regL
acLL
(kΩ)
(MΩ)

 (preconverter efficiency) is generally in the
range of 90 -- 95%.
(I
f
t is the maximum switching period.
(t = 20ms) for narrow range are generally
used.
(Rds)on is the MOSFET drain source on--time
resistor.
In Follower Boost, the ratio (V
higher. The on--time MOSFET losses are then
reduced.
The Average Diode Current depends on the
power and on the output voltage.
This formula indicates the required dissipation
capability for R
The overcurrent threshold is adjusted by R
at a given R
R
The Follower Boost characteristic is adjusted
by the C
The Traditional Mode is also selected by C
C
The output voltage regulation level is adjusted
by R
ac
(t = 40 ms) for universal mains operation and
pk
cs
int
is the ac line frequency (50 or 60Hz).
)max is the maximum inductor current.
can be a preconverter inrush resistor.
is the oscillator pin internal capacitor.
o
.
T
choice.
cs
.
cs
(current sense resistor).
acLL
/V
o
) is
OCP
T
.