Datasheet

CCRACGEVB
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2
The CCRACGEVB is set up with multiple jumpers to
allow reuse of circuit components in the different
topologies. There are test points at all the major nodes to
enable the collection of circuit performance data and also
allow engineers to insert their own components for circuit
variations.
The components for CCRACGEVB were selected to
allow evaluation over a large input voltage range. Designers
should review their specific application requirements and
determine if smaller or lower cost parts could be selected in
place of those used here.
The application note is broken up into sections covering
the different circuits. A brief circuit description for each
topology will be provided with the jumpers selected together
with data collected at multiple voltages.
CCRACGEVB Features:
Input Voltage
• 12 VAC to 250 VAC
CCRs
• NSIC2020BT3G 120 V 20 mA SMB
• NSIC2030BT3G 120 V 30 mA SMB
• NSIC2050BT3G 120 V 50 mA SMB
• NSI50150ADT4G 50 V 150−350 mA DPAK
Topologies
• Straight No Dimming, With Output Capacitance,
With Triac Dimming
• Cap−Drop No Dimming, With Triac Dimming
• Chopper No Dimming, With Triac Dimming
Inrush Current Limiter
LED Board (supplied with CCRACGEVB)
• 10x XLAMP MX−6S LEDs
Figure 2. Straight Non−dimmable LED Driver (120 VAC example)
Straight LED Driver, Non−dimming (120 VAC Example):
The Straight LED driver circuit is the simplest with the
lowest BOM and highest PF.
To setup the CCRACGEVB for the Straight LED driver
non-dimming topology, place jumpers according to Table 1.
Table 1. JUMPERS PLACED ONTO THE EVB
Jumpers in Place Reference Data
J1, J13, J18, J19, J20, J22, J26 Appendix A
The AC input is rectified using an AC bridge (D1 – D4).
A CCR (CCR3, 4, 5 or 6) controls the current through the
LED string. The LEDs will be turned on at twice the AC
frequency (120 Hz in the USA). The duty cycle is about
60%. Figure 2 depicts the schematic with the evaluation
board reference designators.
V
F- Total
LEDs
The maximum forward voltage drop across the LED
string is determined by the minimum input peak voltage
minus the minimum regulating voltage for the CCR.
Assuming −10% tolerance of AC mains:
MAXV
F*Total
LEDs + AC Vin
MINPeak
*V
AKMIN
(eq. 1)
MAXV
F*Total
LEDs + 120 V 1.414(*10%)*3V+
+ 150 V
The minimum forward voltage drop across the LED string
is determined by the maximum input peak voltage minus the
breakdown voltage of the CCR.
Assuming +10% tolerance of AC mains:
MINV
F*Total
LEDs + AC Vin
MAXPeak
*V
AKMAX
(eq. 2)
MINV
F*Total
LEDs + 120 V 1.414()10%)*120 V +
+ 67 V