NCL30051LEDGEVB ON Semiconductor, NCL30051LEDGEVB Datasheet - Page 2

• Manufacturer Part Number: NCL30051LEDGEVB
• Description: Power Management IC Development Tools 90-265VAC 60W ISO CC EVB
• Manufacturer: ON Semiconductor
• Type: Power Factor Correctionr

Specifications of NCL30051LEDGEVB

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: NCL30051
• Input Voltage: 90 VAC to 265 VAC
• Output Voltage: 35 V to 50 V
• Output Current: 1.5 A

demonstrating three types of dimming control:
•
•
•
optional plug−in DIM card. Without the card, the demo
board can be dimmed with a user provided PWM input
signal operating from 150 to 300 Hz. The maximum output
voltage can be adjusted via selection of a single resistor;
however, it is compliant enough to handle almost a 2:1
output voltage compliance range depending on the string
forward voltage and worst case high line voltage. The
default output current is set at 1 A, but a maximum DC
output current of 1.5 A is available by modifying a single
resistor value. Higher currents can be supported with
different transformer designs. The power level of this design
is targeted at applications operation below 60 Vdc
maximum and below 100 VA to be under the maximum
power requirements of IEC (EN) 60950−1 (UL1310
Class 2) supplies. The specification table below lists the key
design objectives.
Specifications
Universal Input:
Frequency
Power Factor:
Harmonic Content EN61000−3−2 Class C Compliance
Efficiency
Target
V
Constant Current
I
V
Current Tolerance
Cold Startup
Pout Maximum:
Dimming:
out
out
max
Beyond the power stage design, circuitry is provided for
These three dimming functions are incorporated on an
Analog dimming with a 0 to 10 V programming signal;
Bi−level dimming with a simple logic level input
signal;
PWM dimming using an onboard oscillator with
variable pulse width.
Range:
Compliance
Range:
> 0.9 (50−100% of Load with
Two Step Bi−level Analog Dimming
90 − 265 Vac (up to 305 Vac with
component changes)
47 − 63 Hz
dimming)
> 88% at 50 −100% of 50 W, I
/ V
UL1310 Class 2 Dry/Damp, isolated <
100 VA and < 60 V peak
35 to 50 Vdc (selectable by resistor
divider)
0.7 − 1.5 A, 1 A nominal (selectable by
resistor)
>50 to 100% of V
±2% or better
< 1 sec typical to 50% of load
60 W
PWM dimming with optional DIM
board
f
= 50 V
out
out
http://onsemi.com
= 1 A
2
Protection:
Primary Side Circuitry
It contains the PFC and resonant half−bridge along with the
associated bias, drive, and primary feedback circuitry. As
shown in the primary side schematic, the circuit grounds
should are segregated into three areas (logic, drive, and
power) and interconnected at strategic “star” or “tree” points
as shown to minimize ground loops and cross talk
interaction. For optimum circuit performance and stability,
it is critical that “star” grounding be used for the PCB layout.
Logic level timing and filter components such as C10, C12,
C14, C15, C17, and C16 should be located as close to main
controller U1 as possible.
facilitate testing the PFC and resonant half−bridge
separately. Jumper JMP3 can be used as a wire loop for a
clip−on current probe to check the current waveform profile
and tuning of the resonant half−bridge.
differential mode conducted EMI filter is incorporated at the
mains input. The leakage inductance of L1 in conjunction
with “X” capacitors C1 and C2 form a differential mode
filter. Common mode filtering is achieved via the coupled
inductance of L1 and “Y2” capacitor C27 which ac couples
the primary and secondary grounds. In this particular design,
the simple common mode filter indictor of L1 was sufficient
to pass EN55022, Level A for commercial applications. A
plot of the conducted EMI is shown in Figure 14 and the
harmonic line current profile is shown in Figure 15.
The primary side circuit schematic is shown in Figure 1.
Jumper JMP1 and test point terminals are provided to
Referring to Figure 1, a combination common and
PWM dimming frequency 160 Hz –
300 Hz with external signal input
(referenced to a secondary side signal
ground)
Dimming range > 10:1
0−10 V (100K) analog voltage input
dimming, 1 = minimum, 10 V is 100%
on (range dependent on nominal AC
input)
Short Circuit Protection
Open Circuit Protection < 60 V peak
Over Temperature – (optional)
Over Current Protection − Auto
recovery
Over voltage protection (input and
optional output)