NCP1608BDR2G ON Semiconductor, NCP1608BDR2G Datasheet - Page 17

• Manufacturer Part Number: NCP1608BDR2G
• Description: IC PFC CTLR/PRECONVERTER 8-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1608BDR2G

• Mode: Critical Conduction (CRM)
• Frequency - Switching: Adjustable
• Current - Startup: 24µA
• Voltage - Supply: 8.8 V ~ 12.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Switching Frequency: 70 KHz
• Maximum Power Dissipation: 450 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

V
control range. Figure 38 compares V
to a device with a 3 V control range for an application with
the following parameters:
P
L = 200 mH
h = 92%
Vac
Vac
larger than the 3 V control range device. The 50% increase
enables the NCP1608 to prevent inadvertent skipping at
high input voltages and high output power.
out
V
Control
V
The wide control range of the NCP1608 increases
Figure 38 shows that V
ZCD(TRIG)
ZCD(ARM)
V
LL
HL
Ct
V
CL(NEG)
= 250 W
V
Control
(offset)
DRV
Ct(off)
V
= 85 Vac
= 265 Vac
Figure 37. Ct Pin Noise Induced On Time
ZCD
V
and V
Ct
Reduction and Pulse Skipping
Ct(off)
t
t
on(loop)
on
in comparison to devices with less
Noise Induced Voltage Spike
Ct(off)
DRV Remains Off
is Not Exceeded
V
ZCD(ARM)
t
of the NCP1608 is 50%
start
Low V
Low V
Ct(off)
V
Control
Ct(off)
Control
of the NCP1608
Voltage
Voltage
− Ct
0 V
(offset)
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17
Startup
line and V
startup current consumption (< 35 mA) enables minimized
standby power dissipation and reduced startup durations.
When V
logic of the NCP1608 are enabled. The controller includes
an undervoltage lockout (UVLO) feature that ensures that
the NCP1608 is enabled until V
V
auxiliary winding to supply V
power supply (SMPS), it is generally preferable for the
SMPS controller to startup first. The SMPS then supplies
the NCP1608 V
NCP1230 or NCP1381, control the enabling of the PFC
stage (see Figure 40) and achieve optimal system
performance. This sequence eliminates the startup resistors
and improves the standby power dissipation of the system.
V
CC(off)
Generally, a resistor connected between the rectified ac
When the PFC pre-converter is loaded by a switch−mode
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
CC
Figure 38. Comparison of Ct Charging Threshold
0
25
Figure 39. Typical V
. This hysteresis ensures sufficient time for the
CC
CC
V
in
exceeds V
charges the V
= 265 Vac
75
P
CC
out
vs. Output Power
. Advanced controllers, such as the
, OUTPUT POWER (W)
CC(on)
125
CC
V
V
CC(off)
CC(on)
CC
, the internal references and
capacitor to V
CC
Startup Waveform
CC
(Figure 39).
175
decreases to less than
NCP1608
3 V Control
Range
CC(on)
225
. The low
275