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© Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 1
1 Publication Order Number:
EVBUM2051/D
NCP1612GEVB
160-W, Wide Mains, PFC
Stage Driven by the
NCP1612 Evaluation Board
User's Manual
Introduction
Housed in a SO-10 package, The NCP1612 is designed to
drive PFC boost stages in so-called Current Controlled
Frequency Fold-back (CCFF). In this mode, the circuit
classically operates in Critical conduction Mode (CrM)
when the inductor current exceeds a programmable value.
When the current is below this preset level, the NCP1612
linearly decays the frequency down to about 20 kHz when
the current is nearly zero. CCFF maximizes the efficiency
throughout the load range. Incorporating protection features
for rugged operation, it is furthermore ideal in systems
where cost-effectiveness, reliability, low stand-by power
and high-efficiency are the key requirements.
Extremely slim, the NCP1612 evaluation board is
designed to be less than 13-mm high. This low-profile PFC
stage is intended to deliver 160 W under a 390 V output
voltage from a wide mains input. This is a PFC boost
converter as used in Flat TVs, High Power LED Street Light
power supplies, and all-in-one computer supplies. The demo
board embeds the NCP1612 B-version which is best
appropriate for the self-biased configuration. The board is
also configurable to have the NCP1612 powered from an
external power source. In this case, apply a V
CC
voltage that
exceeds the NCP1612B start-up level (18.2 V max) to
ensure the circuit start of operation or solder the NCP1612A
instead. The low V
CC
start-up level of the A-version
(11.25 V max.) allows the circuit powering from a 12-V rail.
Both versions feature a large V
CC
operating range (from
9.5 V up to 35 V).
Table 1. ELECTRICAL SPECIFICATIONS
Description Value Units
Input Voltage Range 90-265 Vrms
Line Frequency Range 45 to 66 Hz
Output Power 160 W
Minimum Output Load Current(s) 0 Adc
Number of Outputs 1
Nominal Output Voltage 390 Vdc
Maximum Startup Time < 3 s
Target Efficiency at Full Load (115 V
rms
) 95 %
Load Conditions For Efficiency Measurements (10%, 20%,..) 10-100 %
Minimum Efficiency At 20% Load, 115 V
rms
93 %
Minimum PF Over The Line Range At Full Load 95 %
Hold-Up Time (the output voltage remaining above 300 V) > 10 ms
Peak To Peak Low Frequency Output Ripple < 8 %
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EVAL BOARD USER’S MANUAL
