NCP1606 ON Semiconductor, NCP1606 Datasheet - Page 19

• Manufacturer Part Number: NCP1606
• Description: Cost Effective Power Factor Controller
• Manufacturer: ON Semiconductor

BOOST DESIGN EQUATIONS
RMS Input Current
Maximum Inductor Peak
Current
Inductor Value
Maximum On Time
Off Time
Frequency
Pin 3 Capacitor
Boost Turns to ZCD Turns
Ratio
Resistor from ZCD wind-
ing to the ZCD pin (pin 5)
Boost Output Voltage
Maximum V
prior to OVP activation and
the necessary R
R
Minimum output voltage
necessary to exit under-
voltage protection (UVP)
Bulk Cap Ripple
Inductor RMS Current
Boost Diode RMS Current
MOSFET RMS Current
OUT2
.
OUT
voltage
OUT1
and
I
M(rms)
f
SW
Components are identified in Figure 1
Id
+
MAX(rms)
Vripple
+ 4
V
Vac
2 @ L @ P
OUT(max)
V
3
L v
OUT
N
R
@
V
R
B
OUT1
(rms)
OUT
R
Ct w
(pk−pk)
ZCD
: N
V
(UVP)
h @ Vac
Icoil
+ 4
OUT2
t
t
I
OFF
ON(max)
pk(max)
OUT
P
I
2
+ 2.5 V @
ac(rms)
ZCD
OUT
2 @ Vac
3
+
+ V
w
OUT
@ h
RMS
h @ Vac
+
@
+
2 @ P
+
@ Vac @ I
+
V
I
v
CL_NEG
@
http://onsemi.com
R
LL
OUT(max)
OUT(nom)
Vac (rms) @ sin(q) @ 2
+
C
V
+
+
2 @ 2
OUT1
+
V
OUT(nom)
bulk
2
OUT
2.5 V @ R
2
1 *
2 @ 2 @ P
OUT
p
@
Vac
2 @ L @ P
RMS
h @ V
R
@
3 @ Vac
h @ Vac
V
R
h @ Vac
OUT
@ 2 @ p @ f
2 @ P
OUT2
pk(max)
) R
@ (N
OUT1
V
@ L @ I
t
P
I
@
ON
Vac
* Vac
HL
OUT
19
1 *
2
V
OVP
* V
OUT
) R
2
ac(rms)
h @ Vac
@ V
R
ZCDH
P
@ 2
B
* 2.5 V
OUT2
OUT
OUT2
* Vac
(rms)
) R
OUT
OUT1
LL
LL
OUT
: N
LL
charge
OUT(nom)
CTMAX
OUT
@ f
OUT1
* 1
HL
2
8 @ 2 @ Vac
@ h
V
line
3 @ p @ V
ZCD
SW(min)
P
@ V
@ | sin q | @ 2
OUT2
OUT
@ 2
OUT
LL
@ I
@ V
)
UVP
@ V
OVP
OUT
OUT
OUT
LL
h (the efficiency of only the Boost
PFC stage) is generally in the range
of 90 − 95%
I
age.
f
ing frequency. The maximum L must
be calculated at low line and high
line.
The maximum on time occurs at the
lowest line voltage and maximum
output power.
The off time is greatest at the peak of
the AC line voltage and approaches
zero at the AC line zero crossings.
Theta (q) represents the angle of the
AC line voltage.
I
NCP1606 specification table.
The turns ratio must be low enough
so as to trigger the ZCD comparators
at high line.
R
the shutdown comparator is not inad-
vertently activated.
I
cation table. I
NCP1606B, then for the NCP1606A
version.
V
fication table.
Use f
universal lines. The ripple must not
exceed the OVP level for V
pk(max)
(min)
charge
OVP
UVP
ZCD
is given in the NCP1606 specifi-
LINE
is the minimum desired switch-
must be large enough so that
is given in the NCP1606 speci-
and V
occurs at the lowest line volt-
= 47 Hz for worst case at
CTMAX
OVP
is lower for the
are given in the
OUT
.