AN204

AN204
AP3983 (PSR Switcher) + AL1794 (4-Channel Linear CCR LED Driver)
3-Channel Warm Dimming (WD) / 3-Channel Tunable Color (TC)
Smart Connected Light Bulb (SCL) Reference Design
GENERAL DESCRIPTION
The emerging Smart Connected Light (SCL) Bulbs, as Internet Of Things (IoT) devices in Smart Home
environment, are characterized by integration of wireless-connectivity microcontroller (MCU) in LED light
bulbs. Users can manage LED light bulbs through smart phone APPs to achieve the following needs:

Energy saving (through dimming of brightness) - 1-channel Dimmable White (1-ch DW)

Light quality management – 2-channel Tunable White (2-ch TW)

Entertainment lighting – 3-channel Tunable Color (3-ch TC) or 4-channel White+RGB (4-ch W+RGB)
Typical functional block diagram of SCL bulbs consists of:

AC-DC Power Conversion

LED Driver

Emitter Module

Wireless MCU Connectivity
This application note describes the complete reference design of a 6.5W PAR16 ZigBee-Enabled 3channel Warm Dimming (WD) and Tunable Color (TC) SCL bulbs for both commercial and residential
lighting applications. It serves as a good starting point for system designers to further customize SCL bulb
design to their desired performance and cost consideration for similar products.
KEY SPECIFICATION

Model_#1:
Model_#2:
P16-DD-LE-LO-LD-3WD
P16-DD-LE-LO-LD-3TC

Lamp Shape:
PAR16

Operating Power:
6.5W

Operating Voltage: 100V-240V

Frequency:
50/60Hz

Average Lifetime:
25,000Hrs

Bulb Base:
E26/E27

Lumen:
> 250 lumens

CCT Range:
Warm Dimming
Tunable Color
1,900K to 3,000K (WD)
2,000K to 5,500K (TC)

CRI:
90Ra

Wireless:

Dimension (L*D):
ZigBee (Atmel SAM R21)
50mm x 73.5mm
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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AN204
FUNCTIONAL BLOCK DIAGRAM
LED Emitter
AC
AC-DC Power
Conversion and
Power Management
Constant
Voltage
LED Driver Circuit
Constant Current and
PWM Controller
Constant
Current
Module
< PWM Control
Status >
3.3V DC
Wireless Command
Input
Wireless Connectivity Module
q ACDC Controller
– AP3983C
q LED Driver and PWM
Dimming – AL1794
q ULDO Regulator
– AP2204K
Figure 1 - Functional Block Diagram for Smart Connected Light Bulb
A typical SCL bulb (Figure 1) consists of four major functional blocks:
1) AC-DC Power Conversion - It converts AC input to one or multiple desired output DC Constant Voltages
(CV). For a SCL bulb, two or more CVs might be required to better support various DC power requirements
from Emitters and Wireless Connectivity MCU.
2) LED Driver - Taking CV inputs to relevant LED driver channels, the LED driver circuitry generates one or
more Constant Current (CC) to drive associated LED emitters.
3) Wireless Connectivity Module - The Wireless Connectivity Module consists of an intelligent MCU and RF
circuitry to connect a SCL bulb either directly with smartphones or indirectly through WiFi/ZigBee hub, based
on a communication protocol (e.g. Bluetooth/BLE, ZigBee, etc.)
4) LED Emitter Module - This is the light source for the SCL bulb. Driven by PWM dimming signal(s) from
Wireless Connectivity MCU, emitters on the LED Emitter Module are properly mixed to generate desired light
output - either brightness adjustment, Corellated Color Temperature (CCT) tuning, or color mixing.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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APPLICATION DESCRIPTION
 Power Board (PB) Application Description
The PB design (Figure 2) is based on AP3983C PSR AC/DC Switcher IC (with integrated MOSFET referred in
the Key Component Section) to be capable of power rating up to 7.5W (SO-7 Package). To support both emitter
strings and attached MCU power, the PB outputs two CVs:

Warm Dimming (WD) Lamp
1) VLED1 - 8.2V for for driving emitter strings of RED, 3-die- in-serial
2) VLED2 – 7.4V for driving emitter strings of GW (Green-ish White), 2-die-in-seiral and BW (Blue-ish
White), 2-die-in-serial, Emitters

Tunable Color (TC) Lamp
1) VLED1 - 11.0V for driving emitter strings of G (Lime-Green White), 3-die-in-serial
2) VLED2 – 7.4V for driving emitter strings of RED, 2-die- in-serial, and for emitter stings of Blue, 2die-in-serial.
Note that VLED1 and VLED2 supply constant voltages to attached emitter strings with sufficient voltage
headroom (LEDx) for voltage regulation of AL179X (LED Driver IC) to properly function. The maximum VF
(Forward Voltage) for Red, Green-ish White and Blue-ish White emitters is 3.5V for 350mA maximum channel
current. The maximum VF for RED emitters is 2.6V for 350mA maximum channel current. For 350mA channel
current, the maximum LEDx (voltage headroom) is 0.4V. The rqeuired constant voltage to drive wireless MCU
(3.3V) is generated from an LDO (AL2204) with input from VLED2 (7.4V).
Figure 2 - AP3983C Power Board (42mm x 30mm, Power Boards)
For the design principles and design examples of AP3983C power board (e.g. Swithcing Frequency, Transformer
Design, Feedback Resistors Nework Design), please refer to Diodes' Application Note of AP3983.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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 Emitter Module Board (EMB) Application Description
Two types of Emitters matching specific needs of WD and TC applications:
 WD EMB (Figure 3.a) - Suitable for CCT range 3,000K to 1,900K.

Emitter Structure - R (3 dies in serial), GW (2 dies in serial ) and BW (2 dies in serial) in parallel
strings
Figure 3.a - 3-Ch WD Emitter Module
 TC EMB (Figure 3.b) - Suitable for CCT range 6,500K to 2,000K.

Emitter Structure - R (2 dies in serial), G (3 dies in serial ) and B (2 dies in serial) in parallel strings
Figure 3.b - 3-Ch TC Emitter Module
For detailed emitter specification, please refer to Appendix II (LED Engin Emitters)
 Lens Application Description
PAR16 lamps feature dierctional lighting with narrow beam angle. To create a narrow beam angle as well as to
provide much superior color mixing, a Lens is used for achieving both goals (Figure 4).
The key parameters of the lens are as shown below:


FWHM CBCP -
Full Width at Half Maximum
Center Beam Candlepower
FWHM
FW10%
Efficiency
CBCP (cd/lm)
27°
57°
94%
2.6
Figure 4 - Lens for PAR16 Lamp
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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
LED Driver and ZigBee Board (LZB) Application Description
A ZigBee IC, Antenna as well as LED driver (AL1794, 4-Channel Linear CCR LED driver) co-exist in the same
PCB (Figure 5). In this 3-Ch WD/TC SCL bulb design, the REF (reference current setting resistor) for LED Driver
circuit is 8.5KΩ to regulate a total channel current around 350mA for both Channel 1 and Channel 2 and 262.5mA
for Channel 3.
Figure 5 - Wireless & LED Driver Board (41.2mm Outside Ring, 18mm Inside Ring)
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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PERFORMANCE TESTING
Though with different target CCT Ranges and quality of white light, the PAR16 3-ch WD is comparable to
OSRAM's PAR16 2-Channel Tunable White Lightify lamp
(http://led.osram.com/led_com/lightify/index.jsp?mkturl=lightify).
The key feature competitive analysis is summarized in Table 1a.
Similarly, the PAR16 3-ch TC is comparable to Philips' HUE Tunable Color lamp
(http://www2.meethue.com/en-us/the-range/hue/).
A key feature competitive analysis is summarized in Table 1b.
PAR16 WARM DIMMING LAMP COMPETITIVE ANALYSIS
NO
Benchmark Item
LIGHTIFY TUNABLE WHITE
LiteON PAR16 (Warm Dimming)
1
Input AC Voltage (V)
220 - 240
90 - 260
2
Power (W)
6
6.5
3
Power Factor
0.56 (230Vac)
0.85 (120Vac) 0.77 (230Vac)
5
Standby Power (W)
0.44W (230Vac)
0.15W (120Vac) 0.4W (230Vac)
6
Start-Up Time (Second)
N/A from Wall Switch
0.4 second from Standby Mode
1.2 second from Wall Switch
0.4 second from Standby Mode
7
Emitter Module
Individual Emitters
(2,700K W + 6,500K W)
7mm x 7mm 7-die single Emitter
8
CCT Range (°K)
2,700K - 6,500K
1,900K - 3,000K
9
CCT White
10
CRI
81 @ 2,800K
90 @ 3,000K
11
Luminous Flux Φv (lm)
481lm @ 2,800K (RT)
428lm @ 2,800K (hot)
300lm (RT)
12
Beam Angle (°)
32
27
13
Iluminance Ev (Flux 2
lm/m )
966 @ 2,800K
884
14
Efficacy (lm/W)
80 lm/W @ 2,800K
46 lm/W @ 3,000K
15
Wireless Connectivity
ZigBee
ZigBee
16
Dimension (L x D in mm)
58x50
73.5x50
Mixing 2,700K+ 6,500K White - Linear Warm Dimming - True White by Mixing
Approximation
Wg-Wb-R
Table 1a - Competitive Analysis Summary of PAR16 3-ch WD SCL Bulbs
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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PAR16 TUNABLE COLOR LAMP COMPETITIVE ANALYSIS
NO Benchmark Item
HUE Tunable Color PAR16
PAR16 (Tunable Color)
1
Input AC Voltage (V)
120
90 - 260
2
Power (W)
6.5
6.5
3
Power Factor
0.55
0.856 (120Vac) 0.772 (230Vac)
5
Standby Power (W)
0.45W
0.31W (120Vac) 0.47W (230Vac)
6
Start-Up Time (Second)
2.0second from Wall Switch
0.5 second from Standby Mode
1.2 second from Wall Switch
0.4 second from Standby Mode
7
Emitter Module
Individual Emitters (G3-R2-B2)
7mm x 7mm 7-die single Emitter
8
CCT Range (°K)
2,000K - 6,500K
2,000K - 5,500K
9
CCT White
Mixing RGB
Mixing RGB
10 CRI
>80 CRI, 2,000K - 4,000K
90 @ 2,000K
89 @ 2,700K
85 @ 3,000K
77 @ 4,000K
71 @ 5,500K
11 Luminous Flux Φv (lm)
*1 195 lm @ 2,700K (Default StartUp)
*2 145 lm @ 2,000K,
*3 210 lm @ 3,000K,
*4 300 lm @ 4,000K,
*5 230 lm @ 6,500K
(estimate) (6.5W)
*1 228 lm @ 2,700K
*2 190 lm @ 2,000K,
*3 233 lm @ 3,000K,
*4 245 lm @ 4,000K,
*5 255 lm @ 5,500K
(measured)
175lm @ 4000K (4.5W)
12 Beam Angle (°)
38
27
13 Efficacy (lm/W)
38 lm/W @ 4,000K
38 lm/W @ 4,000K (estimate)
14 Wireless Connectivity
ZigBee
ZigBee
15 Dimension (L x D in mm)
50.8x50.8
73.5x50
Table 1b - Competitive Analysis Summary of PAR16 3-ch TC SCL Bulbs
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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SYSTEM DESIGN CONSIDERATIONS AND TRADE-OFFS
When design a production-worthy SCL bulb, the system designers have many considerations:
1) Input Voltage Range
2) Power Factor (PF)
3) Efficiency
4) Standby Power
5) Start-Up Time
6) Improving Lumen Output
7) Thermal Management
While 3-ch WD/TC SCL bulbs are designed for full range voltage input, system designs could optimize
components for single voltage application (e.g. 120V or 230V). For example, more cost-effective components
could be used for 120V-only SCL bulb, including:
1) BD201 (MB06S, see Figure 9 on Page 11)
2) Passive Valley Fill (PVF) Circuit: C201, C202, D201, D202 and D203 (see Figure 9 on Page 11).
+ C201
AC
D203
BD201
D202
D201
+ C202
Figure 6 - Bridge and Valley Fill Circuit
AP3983C (SO-8), with integrated MOSFET switch, has its advantages of supporting a cost-effective power board
design. The relative small ripple of output voltage for CVs of AP3983C (Vpeak-to-peak ripple < 2.9% of the CV of
Emitter Strings) is ideal to support linear Constant Current Regulation (CCR) based LED driver, such as AL1792,
with optimal voltage headroom for attached LED emitter strings.
Per Energy Star Compliance requirement, the Power Factor (PF) for over 5W light bulb need to be over 0.7. As
the AP3983C does not have built-in Active Power Factor circuitry, a PVF Circuit, consists of C201, C202. D201,
D202 and D203 is designed to achieve desired PF over 0.7. A high PF value could be achieved by using larger
capacitors (C201 and C202), but at the expenses of longer start-up time, PCB space and cost. The system
designers need to select the right balance for the PF value and other considerations.
The system efficiency of 6.5W typical 3-ch PAR16 WD/TC bulbs need to be above 70% based on the proposed
two-stage designs. For the Power stage (first stage) efficiency, it is designed to achieve over 75%. While fixedCCT on-off LED light bulb will have no power consumption when turned off at standby mode, a SCL bulb
consumes non-trivial standby power due to constant-on for wireless module connectivity. To save energy
consumed during the standby mode, it recommded to stay within 0.5W when in the standby mode for the entire
SCL bulb.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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Key relevant circuitry which impact efficiency and standby power consuption include:
1) CV Output Voltages (PV1, PV2 - used to generate 3.3V for MCU Power).
2) Pre-loading circuit (R213, R214 and R216, see Figure 9 on Page 11) to prevent spurious output voltage
at no load situation for one CV output, but sudden current is drawn by the other CV output.
3) Low VF Drop Super Barrier Rectifier (D211 and D212, see Figure 9 on Page 11)
4) Start-Up Circuit R201 (see Figure 9 on Page 11).
An alternative quick dynsmic startup circuit can be used to replace the resistor start-up circuit to shorten start-up
time without static standby power consumptino (Figure 7). During the AC power initial input, Transistor Q1 is
turned ON to charge VCC input to AP3983C. Q1 will be shut off after initial start-up time until shut off by returning
path from the auxiliary winding when VCC is highter than one threshold voltage below 18V where the Zener diode
is clamped at.
HV
R2
R1
Q1
BSS127
ZD1
DFLZ18
VCC
Figure 7 - Dynamic Fast Start-Up Circuit

Improve Lumen Output with Unused Channel 4
AL1794, a 4-channel LED driver, has a fixed channel current ratio of 1:1:0.75:0.25 for Channel 1, 2, 3 and 4
respectively. In the current reference design of PAR16 lamps, only the first 3 LED driver channels of AL1794 are
used. The Channel 4 LED driver can be used in parallel to Channel 1, 2 or 3 to enhance lumen output to desired
effects. For example, enhancing GREEN channel with Channel 4 driver will enhance the overall lumen output of
the TC lamp. Adding Channel 4 to the RED channel will result in stronger warm light output.

Thermal Management Design Suggestion
Thermal management is a critical design consieration as it impacts safety and reliability of the SCL bulbs. Among
many good practices used in the power board design for managing thermal issues of SCL bulbs, system
designers also need to fine tune the CV output to compensate for VF fluctuation due to temperature effect.
Depending on thermal characteristics of emitters, V F drops around 5% to 10% range when temperature is
increased from 25°C to 125°C. The proposed design is based on a low-cost open-loop CV fine tuning approach
by adopting a Negative Temperature Coeffient (NTC) resistor 10K (RT201, Figure 9).
Pin4 of Transformer T201
AP3983C
R209
FB
R205
RT201
R210
R206
Figure 8 - Thermal Management Circuit
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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Also, VF matching resistors are used to help matching VF matching between strings attached to a CV source (R3
and R4, see Figure 11.b Page 13). The main purpose is to distribute unused LED power between the resistor and
AL1794 less the unused LED power is all absorbed by AL1794 only.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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COMPLETE DESIGN SCHEMATICS
R211 C211
L
F201
L201
D211
10R,1WS
C203
1
1
MOV1
CX201
4
-
~
R203
+ C201
+
7
D203
C213
3
R213
PV1
9
D202
2
BD201
R201
GND
R212 C212
3
2
N
J1A
1
2
~
R216
D204
R204
D205
PV2
4
VADJ
+ C202
D201
D212
4
10
5
6
CON4*1_2mm
+ C204
C214
R209
CS
R205
CPC
RT201
2
R210
7
GND
R208
R206
1
R207
C251
5,6
D
FB
4
R214
3
VCC
U201
AP3983C/SO-7
T201
EE13/5P+5P
CY 201
C205
Figure 9 - AP3983C Power Board Schematics
PV2
GND
PV2
VADJ
C3
C4
VIN
1
3
2
3
EN
U1
VOUT
GND
C1
PV1
2
1
J1
ADJ/NC
5
4
P3V3
PV1
C5
AP2204K-3.3TRG1
R1
P3V3
4
PV1ADC
2417SJ-04
R2
LEDPG
NTC
FAULTB
R3
U2 AL1794AFE-13
1
LEDEN
2
PWM4
3
PWM3
R4
C6
4
PWM2
5
PWM1
6
R5
C7
VIN
PWM4
REF
PWM3
FAULTB
PWM2
LEDPG
PWM1
LED4
LED1
LED3
LED2
GND
14
13
J2
12
8
R6
C2
11
7
10
6
9
5
8
4
15
7
EN
PGND
LEDPG
R7
3
2
1
NTC
GND
LED4
LED3
LED2
LED1
PV2
PV1
A2002WV2-8P
Figure 10.a - LED Driver - AL1794 Schematics
AN204 3-Ch WD/TC SCL Bulb
Reference Design
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Xtal
XTAL2
XTAL1
U3
P3V3
C10
C11
0.022 nF/50 V 2.2 uF/10 V
GNDA
GNDA
8
PWM1
11
PWM2
12
6
C23
100 nF/16 VGND
14
PWM3
15
PWM4
16
G
Q
C20
C21
@0.022 nF/50 V @0.022 nF/50 V
2 RF50B
1
2
G
R
G
1
7
13
CON1
MS-156C
3
4
2
0.022 nF/50 V
6
AVDD
R80 10 Kohm
10
T1
3
GND
G
ANT1
@SC-251B
C19
5
P3V3A
P3V3
5
GNDA
1 RF50A
GNDA
R79 10 Kohm
9
C14
C15
0.022 nF/50 V 100 nF/16 V
ANT
4
U
G6
G2 G5
BA BB
6
5
GNDA
4
RFP
2450BM15A0015E
RFN
GNDA
17
18
19
20
R81 10 Kohm
21
R82 10 Kohm
22
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
R83 10 Kohm
23
R84 10 Kohm
24
49
GNDA
AIN10/Y8/SC5_0PB02
XTAL2
SC1_3/TCC1_1PA31
XTAL1
SC1_2/TCC1_0/SWCLKPA30
GNDANA5
VDDIN
VDDANA
VDDCORE
AVDD
GND42
GNDANA8
SC3_1 PA28
VREFB/AIN4/AIN0/Y2/SC0_0/TCC0_0
PA04
RESET_
AIN5/AIN1/Y3/SC0_1/TCC0_1
PA05
AIN6/AIN2/Y4/SC0_2/TCC1_0
PA06
AIN7/AIN3/Y5/SC0_3/TCC1_1
PA07
VDDIO13
SC3_0 PA27
SC5_3 PB23
SC5_2 PB22
VDDIO36
GND14
GND35
AIN16/X0/SC0_0/SC2_0/TCC0_0/FEC0
SC3_3/SC5_3/TC5_1/TCC1_3/USB_DPPA25
AIN17/X1/SC0_1/SC2_1/TCC0_1/FEC1
PA09 SC3_2/SC5_2/TC5_0/TCC1_2/USB_DMPA24
PA08
GNDANA17X11/SC3_1/SC5_1/TC4_1/TCC0_5PA23
RFP
X10/SC3_0/SC5_0/TC4_0/TCC0_4PA22
RFN
DVDD
GNDANA20
GND29
SC2_0/TCC2_0/FEC2
PA12
X7/SC1_3/SC3_3/TC3_1/TCC0_3PA19
SC2_1/TCC2_1/FEC3
PA13
X6/SC1_2/SC3_2/SC3_0/TCC0_2PA18
SC2_2/TC3_0/FEC4
PA14
X5/SC1_1/SC3_1/TCC2_1/TCC0_1PA17
SC2_3/TC3_1/FEC5
PA15
X4/SC1_0/SC3_0/TCC2_0/TCC0_0PA16
47
NTC
3
46
SWDIO
45
SWDCLK
44
P3V3
43
VDDCORE
42
Y1
E2SB16.0000F09G11
GND
R86 10 Kohm
40
RESET_
39
LEDEN
38
FAULTB
37
LEDPG
C12
100 nF/16 V
C16
100 nF/16 V
P3V3
C13
2.2 uF/10 V
Debug
J3
GND
1
VTREF SWDIO
3
RXD
33
C22
100 nF/16 V
TXD
GND3 SWDCLK
5
7
32
VADJ
31
C9
GND
GND
GND
34
GND
P3V3
36
35
GND
C8
P3V3
GND
41
1
0.01 nF/50 V
0 ohm
3
XTAL1
SC1_1/TCC2_1
PA01
AIN11/Y9/SC5_1PB03
PV1ADC
0.01 nF/50 V
R10
XTAL2
PA00
48
4
R78 10 Kohm
2
SC1_0/TCC2_0
2
R77 10 Kohm
1
9
GND
R85 10 Kohm
GND5
NC6
NC7
NC8
NC9
RESET_
2 SWDIO
4 SWDCLK
6 R87
0 ohm RXD
8 R88
0 ohm TXD
10 RESET_
222804-00205
30
Cortex Debug
DVDD
29
GND
28
EESCLK
27
EEMOSI
26
EESS_
25
EEMISO
C18
100 nF/16 V
R8
100 Kohm
P3V3
GND
GND
PAD
ATSAMR21G18A-MF
GND
P3V3
SPI Flash
GND
Connect all GND pins to center pad. Connections not in netlist, use plain
lines.
Connect all GNDA pins to center
pad.
GNDA
P3V3
R9
100 Kohm
GND
EESS_
EEMISO
1
2
3
4
P3V3
C17
100 nF/16 V
U4
MX25L4006EM1I-12G
8
GND
/CS
VCC 7
DO /HOLD 6 EESCLK
/WP
CLK 5 EEMOSI
GND
DI
GND
Figure 10.b - LED Driver - Atmel SAM R21 ZigBee Module Schematics
JP3
5
5
6
7
8
D3K_R
25
D4A_B
19
20
NC19
D4K_B
21
D5A_R
B
G
D7A_G
NC13
NC7
t
D3A_R
R
PAD
7
RT1
NTC
22
R
R2
HDR200P8
NC22
NC16
R1
6
D2K_B
D1K_R
NC4
D6K_G
17
16
15
14
13
NC12
4
G
B
18
12
NTC
D2A_B
D7K_G
GND
4
11
LED4
3
NC10
LED3
JP5
3
JP2
NC18
R
10
LED2
2
D1A_R
D5K_R
PV2
LED1
1
9
2
PV1
D6A_G
J1
NC1
8
1
24
E1
LZ7-WD322
23
JP4
JP6
JP7
JP1
Figure 11.a - 3-Ch Warm Dimming Emitter Module Schematics
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
12 of 28
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AN204
JP3
J2
2
D2A_B
4
4
19
20
NC19
D4K_B
21
D3K_G
22
NC22
D2K_B
R
B
3
NC4
G
D3A_G
G
6
25
D4A_B
B
PAD
NC13
R2
7
NC7
A2002WV2-8P
RT1
NTC
t
D7K_R
17
16
15
14
13
NC12
8
D5K_G
18
12
6
7
R
D7A_R
5
D6A_R
NC16
R1
5
JP2
NC18
G
11
NTC
D1K_G
NC10
GND
3
10
LED4
JP6
D5A_G
LED3
JP8
JP4
9
LED2
JP7
2
D6K_R
PV2
LED1
1
NC1
8
PV1
D1A_G
1
24
E1
LZ7-CT232
23
JP5
R3
R4
JP1
Figure 11.b - 3-Ch Tunable Color Emitter Module Schematics
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
13 of 28
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AN204
KEY COMPONENTS

AP3983C - AC/DC Controller
AP3983C IC PIN OUT ASSIGNMENT

Primary Side control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry

Built-In HV power MOSFET with 650V BVDSS

Valley-turn on to reduce switching loss

Up to 80KHz operating frequency at full load for compact size application

Piece-wise frequency reduction to enhance conversion efficiency and suppress audio noise

±5% constant voltage accuracy

±7% constant current accuracy

Open Circuit Protection (OCP), Overall Voltage Protection (OVP), Over Temperature Protection (OTP)

Short Circuit Protection (SCP) with hiccup

3-Segment Drive Current for Radiative EMI Suppression
Pin Name
Symbol
Descriptions
SO-7 / PDIP-7
CPC
1
This pin is connected a capacitor to GND to serve as a cable compensation
function. Additional resistor in parallel with the capacitor will weaken cable
compensation to meet cable-less applications.
FB
2
The voltage feedback is from Auxiliary winding.
VCC
3
This pin receives rectified voltage from the Auxiliary winding of the transformer.
CS
4
It is used for current sense from primary side of the transformer.
D
5, 6
GND
7
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
The pin is connected with an internal power MOSFET's drain.
The pin is the signal reference ground.
14 of 28
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AN204

AL1791/2/3/4 - LED Driver Controller
AL1791/2/3/4 IC PIN OUT ASSIGNMENT
EN
1
14
VIN
PWM4/GND
2
13
REF
PWM3/GND
3
12
FAULTB
PWM2/GND
4
11
LEDPG
PWM1
5
10
LED4/GND
LED1
6
9
LED3/GND
LED2/GND
7
8
GND

Input Voltage Range: 6.5V to 30V

1/2/3/4-channel LED drivers: independent Analog or PWM dimming control for each channel

Reference Current: Adjustable by an external reference resistor

Ratio-optimized currents for 4 independent LED channels (AL1794 only): Suitable for Tunable White and
Tunable Color

Low Standby Power: With EN pin

E-flicker free High Frequency PWM dimming with Deep Dimming Capability: Support 10KHz down to 1.0%,
4KHz down to 0.4%, or 1KHz down to 0.1%

Internal Protections: Under Voltage Lockout (UVLO), LED string open/short protection

Over temperature protection (OTP): Thermal shut down and auto thermal recovery

Fault Reporting: UVLO, OTP, Open, and Short

LED Power Good Reporting

Low system BOM cost

Ambient Temperature Range -40°C to +125°C (Automotive Grade)

U-DFN4030-14: Available in “Green” Molding Compound (No Br, Sb)

Totally Lead-Free & Fully RoHS Compliant

Halogen and Antimony Free. “Green” Device
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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AN204

AL1791/2/3/4 Pin Descriptions
Pin Number
Pin Name
Descriptions
U-DFN4030-14
EN
1
Active-high to Enable, Internally Pulled Down
PWM4/GND
2
PWM Signal Input for channel 4, Internally Pulled Down for AL1794. GND for AL1791, AL1792,
and AL1793.
PWM3/GND
3
PWM Signal Input for channel 3, Internally Pulled Down for AL1793 and AL1794. GND for
AL1791 and AL1792.
PWM2/GND
4
PWM Signal Input for channel 2, Internally Pulled Down for AL1792, AL1793, and AL1794. GND
for AL1791.
PWM1
5
PWM Signal Input for channel 1, Internally Pulled Down (Tied to GND when this channel is NOT
used).
LED1
6
Channel 1 LED Cathode
LED2/GND
7
Channel 2 LED Cathode for AL1792, AL1793, and AL1794. GND for AL1791.
GND
8
Ground
LED3/GND
9
Channel 3 LED Cathode for AL1793 and AL1794. GND for AL1791 and AL1792.
LED4/GND
10
Channel 4 LED Cathode for AL1794. GND for AL1791, AL1792, and AL1793.
LEDPG
11
LED Power Good Indication. Asserted Low to report insufficient headroom. Needs an external
pull-up resistor.
FAULTB
12
Fault Report. Asserted Low to report faulty conditions. Needs an external pull-up resistor.
REF
13
Reference Current Setting through External Resistor (RSET)
VIN
14
Voltage Input
Exposed pad. Internally connected to GND.
Exposed PAD
Exposed PAD
It should be externally connected to GND and thermal mass for enhanced thermal impedance.
It should not be used as electrical conduction path.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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AN204
BILL-OF-MATERIAL – ACDC Poweer Board
Item
QTY
1
1
2
Reference
Part
Package
BD201
SMD
RH06
1
CX201
DIP
RP
RP 0.1uF/450V
3
1
CY201
DIP
Y-CAP
Y1 102M/500V
4
2
C202, C201
DIP
8X10mm
5
1
C203
SMD
C1206
1nF/1000V,NPO
6
1
C204
SMD
C1206
10uF/25V,X7R
7
1
C205
SMD
C0603
100nF/25V,X7R
8
1
C211, C212
SMD
C0805
470pf /100V,X7R
9
1
C251
SMD
C0805
NC
10
2
C213, C214
DIP
8X12mm
11
5
D201, D202,
D203, D204, D205
SMD
SOD-123F
12
2
D211, D212
SMD
SOD-123
13
1
U201
SMD
SO7
14
1
MOV1
DIP
Varistor
07D471K
15
1
RT201
SMD
R0603
NTC Resistor 10K,TSM1A103F34D1RZ
16
1
R201
SMD
R1206
600K/500V, 1%,1/8W
17
1
R203
SMD
R1206
150K, 5%, 1/4W
18
1
R204
SMD
R0603
10R, 5%, 1/10W
19
1
R205
SMD
R0603
45.3K, 1%,1/10W (49.2K for TC)
20
1
R206
SMD
R0603
12.7K 1%,1/10W (14K for TC)
21
1
R209
SMD
R0603
47K, 1%,1/10W
22
1
R210
SMD
R0603
12.1K, 1%,1/10W (20K for TC)
23
1
R207
SMD
R0805
2.7R, 1%,1/8W
24
1
R208
SMD
R0805
1.54R, 1%,1/8W
25
2
R211, R212
SMD
R0805
22R, 5%,1/8W
26
1
R213
SMD
R0805
3.9K, 5%,1/8W
27
1
R214
SMD
R0805
8.2K, 5%,1/8W
28
1
R216
SMD
R0805
15K, 5%,1/8W (20K for TC)
29
1
T201
DIP
EE13 5+5Pin
EE13
30
1
L201
DIP
(Color-coded
inductor)
3.3mH,120mA
31
1
F201
DIP
Fuse
10R,1WS,5%
32
-
PCB
FR4 PCB
TOTAL
39
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
Description
Supplier
Bridge,600V/0.5A,MB6S
Diodes, Inc.
E.C,CD11GD,105°C,6000H,10uF/200V,
8X9mm
E.C,RS,105°C,7000H,470uF/16V,
8X12mm
S1MWF 1A-1000V
Diodes, Inc.
SBR2A40P1,40V/2A
Diodes, Inc.
AP3983C IC
Diodes, Inc.
30.5*42*1mm 2Layers 1oz by Lead free
tin
Power Board Electronic Parts
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AN204
BILL-OF-MATERIAL – LED Drive Board (LED Driver and ZigBee)
LED Driver System BOM
#
Name
QTY
Part Number
Manufacturer
1
U1
1
AP2204K-3.3TRG1
Diodes, Inc.
2
U2
1
AL1794AFE-13
Diodes, Inc.
3
R1
1
100K
Wide input voltage range, 150mA ULDO regulator,
SOT23-5
Quad Channel Current-Ratio-Optimized LED
Driver with Analog and PWM Dimming U-DFN4030-14
Voltage Divider Resistor, Full Voltage input 11.0V
4
R2
1
10K
Voltage Divider Resistor, feedback 1.0V to
PV1ADC
5
R3
1
10K
Voltage Divider Resistor, for Adjusting CV Output
from Power Stage
6
R4
1
10K
Voltage Divider Resistor, for Adjusting CV Output
from Power Stage
7
R5
1
100K
Pull-down Resistor to EN Pin from GPIO of MCU
8
R6
1
6.04K
Reference Channel Current Resistor, to generate
500mA (Maximum Channel current)
9
R7
1
23.2K
Pull-up resistor for NTC (3.3V)
10
C1, C3, C5
3
10uF/25V
11
C2, C4, C6, C7
4
100nF/16V
12
J1
1
Connector
TOTAL
17
Description
LD Board-Driver Electronic Parts
ZigBee Module System BOM (Key Parts only)
#
Name
QTY
Part Number
Manufacturer
1
U3
1
ATSAMR2118A-MF
Atmel
2
T1
1
2450BM15A0015E
3
U4
1
MX25L4006EM1I12G
4
Y1
1
E2SB16.0000F09G1
1
5
TOTAL
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
ANT1 @SC-251B
-
-
Description
ZigBee 2.4GHz IC
SPI Flash
Crystal OSC
Embedded Antenna
LD Board-ZigBee Electronic Parts
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AN204
BILL-OF-MATERIAL – Emitter Board
Tunable Color Emitter Module System BOM
#
Name
QTY
Part Number
Manufacturer
Description
1
E1
1
LZ7-CT232
2
R1
1
0R/1206
Jumper to connected LED4 to LED1, for enhancing
LED1 Channel Current by 25%
3
R2
0
-
Not fitted. (For AL1794_LED4 pin grounding)
4
R3, R4
2
1R/1206
VF (Forward Voltage) Matching Resistor
5
JP1,JP2,JP4,JP5,JP8
5
0R/0603
Jumpers
6
JP3,JP6,JP7
3
0R/1206
Jumpers, JP3 and JP6 are also for VF matching
resistors
7
J1
1
HDR200P8
Jumper from Emitter Module to Driver PCB
8
NTC1
1
10K/1%/0603/NTC
Thermal management detector component
TOTAL
LED Engin
14
LZ7-07T200-0000 (Tunable Color)
Tunable Color Emitter Board Electronic Parts
Warm Dimming Emitter Module System BOM
#
Name
QTY
Part Number
Manufacturer
Description
1
E1
1
LZ7-CT322
2
R1
1
0R1206
Jumper to connected LED4 to LED2, for
enhancing LED2 Channel Current by 25%
3
R2
0
-
Not fitted. (For AL1794_LED4 pin grounding)
4
JP5,JP6,JP7
3
0R/1206
Jumpers and VF (Forward Voltage) matching
resistors
5
JP1,JP2,JP4
3
0R/0603
Jumpers
6
JP3
1
0R/1206
Jumper
7
J1
1
HDR200P8
Jumper from Emitter Module to Driver PCB
8
NTC1
1
10K/1%/0603/NTC
Thermal management detector component
TOTAL
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
LED Engin
11
LZ7-07T100-0000 (Warm Dimming)
Warm Dimming Emitter Board Electronic Parts
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AN204
APPENDIX I - EE13 TRANSFORMER SPEC
A.
Transformer Pin & Wire Description (PAR16 WD)
Circuit:
Primary
Cross sectional view:
Secondary
3Ts
1
7
Over core
L1
2Ts
L3
L5
3
2Ts
9
L4
L4
2Ts
2
L2+L3
10
4
2Ts
L2
F1 Wire Shilding
L5
2Ts
6
5
Start
Teflon Tube
F1
5
L1
Pin definition
(StartEnd)
Wire (φ)
Turn (Ts)
Layers
Layers of Tape
L1
Pin3 to Pin1
2UEW-B 30#AWG x 1P
67
3
2Ts
F1
Pin5 -- Floating
2UEW-B 36#AWG x 1P
full layer
1
2Ts
L2
Pin10 to Pin6
Triple wire-B 28#AWG x 1P
7
0.8
L3
Pin7 to Pin9
Triple wire-B 28#AWG x 1P
1
0.2
2Ts
L4
Pin2 to Pin3
2UEW-B 30#AWG x 1P
51
2
2Ts
L5
Pin4 to Pin5
2UEW-B 34#AWG x 1P
18
1
2Ts
OVER CORE
3Ts
Note.
1.
2.
B.
#
EE13 Bobbin 5+5Pin
Output for Warm Dimming (7.4V + 6.7V turn Ratio)
Electrical Characteristic :
Test Item
Winding
Pin
Rating
Tolerance
Remark
2.1
Inductance
L1+L4
#1 to #2
0.8mH
+/-5%
1KHz / 0.4V
2.2
Leakage Inductance
L1+L4
#1 to #2
100uH
Max
10KHz / 0.4V
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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AN204
C.
Transformer Pin & Wire Description (PAR16 CT)
Circuit:
Primary
Cross sectional view:
Secondary
1
3Ts
7
Over core
L1
2Ts
L3
3
L5
9
2Ts
L4
L4
2Ts
2
L2+L3
10
2Ts
4
L2
F1 Wire Shilding
L5
2Ts
6
5
L1
Start
Teflon Tube
F1
5
Pin definition
(StartEnd)
Wire (φ)
Turn (Ts)
Layers
Layers of Tape
L1
Pin3 to Pin1
2UEW-B 30#AWG x 1P
67
3
2Ts
F1
Pin5 -- Floating
2UEW-B 36#AWG x 1P
full layer
1
2Ts
L2
Pin10 to Pin6
Triple wire-B 28#AWG x 1P
7
0.7
L3
Pin7 to Pin9
Triple wire-B 28#AWG x 1P
3
0.3
2Ts
L4
Pin2 to Pin3
2UEW-B 30#AWG x 1P
51
2
2Ts
L5
Pin4 to Pin5
2UEW-B 34#AWG x 1P
18
1
2Ts
OVER CORE
3Ts
Note.
1. EE13 Bobbin 5+5Pin
2. Output for Tunable Color (9.8V + 6.7V turn Ratio)
D.
#
Electrical Characteristic :
Test Item
Winding
Pin
Rating
Tolerance
Remark
2.1
Inductance
L1+L4
#1 to #2
0.8mH
+/-5%
1KHz / 0.4V
2.2
Leakage Inductance
L1+L4
#1 to #2
100uH
Max
10KHz / 0.4V
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
21 of 28
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AN204
APPENDIX II - LED ENGIN 3-CHANNEL WD and TC EMITTERS

LZ7-07T100-0000 Tunable White (Warm Dimming) LED Emitter
Key Features

Ultra-bright, ultra-compact tunable white emitter

Capable of high quality, high CRI white light

Typical emitter flux output 345lm@ 3000K, 6.4W

Typical efficacy 54lm/W

Based on LuxiGen LZ7-series 7-die high power density product platform

Small high density foot print – 7mm x 7mm

High luminous flux density with LES 6mm

Surface mount ceramic package

Exceptionally low thermal resistance with electrically neutral thermal path
 Lead (Pb) free and RoHS compliant - reflow soldering (up to 6 cycles)
Luminous Flux
Typical
Luminous Flux (ΦV) @ IF = 500mA
3 Red
2 GreenWhite
2 BlueWhite
210 lm
312 lm
294 lm
Notes:
 Luminous flux performance guaranteed with in published operating conditions. LED Engin maintains a
tolerance of +/- 10% on flux measurements.
Forward Voltage Bin
Typical
Forward Voltage (VF) @ IF = 500mA
3 Red
2 GreenWhite
2 BlueWhite
6.9 V
6.2 V
6.2 V
Notes:
 Forward Voltage is binned with all LED dies of a kind connected in series.
 LED Engin maintains a tolerance of +/-0.16V for forward voltage measurements for the LEDs.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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AN204
Tunable Emitter Chromaticity Coordinates
Plotted on excerpt from the CIE 1931 (2°) x-y Chromaticity Diagram.
Chromaticity Bin Coordinates
Typical
CIEX @ IF = 500mA
Red
GreenWhite
BlueWhite
0.681, 0.318
0.443, 0.533
0.342, 0.383
Notes:

LED Engin maintains a tolerance of +/-0.002 on x, y coordinates.
Dominant Wavelength Bins
Typical
Dominant Wavelength (λD) @ IF = 500mA
Red
GreenWhite
BlueWhite
616
571
561
Notes:

LED Engin maintains a tolerance of +/-1.0nm on dominant wavelength measurements
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
23 of 28
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AN204
Mechanical Dimensions (mm)
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
24 of 28
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AN204

LZ7-07T200-0000 Tunable Color (TC) LED Emitter
Key Features

Ultra-bright, ultra-compact tunable color emitter

Capable of simulating 16 million shades of color

Typical emitter flux output 388 [email protected], 7.5W

Typical efficacy 52 lm/w

Based on LuxiGen LZ7-series 7-die high power density product platform

Small high density foot print – 7mm x 7mm

High luminous flux density with LES 6mm

Surface mount ceramic package

Exceptionally low thermal resistance with electrically neutral thermal path

Lead (Pb) free and RoHS compliant – reflow soldering (up to 6 cycles)

Emitter available on 3-channel MCPCB (optional)
Luminous Flux
Typical
Luminous Flux (ΦV) @ IF = 500mA
2 Red
3 GreenWhite
2 BlueWhite
144 lm
480lm
63lm
Notes:
 Luminous flux performance guaranteed with in published operating conditions. LED Engin maintains a
tolerance of +/- 10% on flux measurements.
Forward Voltage Bin
Typical
Forward Voltage (VF) @ IF = 500mA
2 Red
3 GreenWhite
2 BlueWhite
4.9 V
9.3 V
6.2 V
Notes:
 Forward Voltage is binned with all LED dies of a kind connected in series.
 LED Engin maintains a tolerance of +/-0.16V for forward voltage measurements for the LEDs.
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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AN204
Tunable Emitter Chromaticity Coordinates
Plotted on excerpt from the CIE 1931 (2°) x-y Chromaticity Diagram
Chromaticity Bin Coordinates
Typical
CIEX @ IF = 500mA
Red
GreenWhite
BlueWhite
0.691, 0.308
0.445, 0.533
0.158, 0.040
Notes:

LED Engin maintains a tolerance of +/-0.002 on x, y coordinates.
Dominant Wavelength Bins
Typical
Dominant Wavelength (λD) @ IF = 500mA
Red
GreenWhite
BlueWhite
620
571
457
Notes:

LED Engin maintains a tolerance of +/-1.0nm on dominant wavelength measurements
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
26 of 28
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© Diodes Incorporated
AN204
Mechanical Dimensions (mm)
Package Outline Drawing
LED Engin
Web Site:
Contact:
www.ledengin.com
Cindy Xu ([email protected])
APPENDIX III - ZIGBEE MODULE Atmel SAM R21

Introduction and Specification
 ZigBee IC On board:
Atmel SAM R21
http://www.atmel.com/images/45067a-sam-r21_brochure_e_a4_021214_web.pdf
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
27 of 28
www.diodes.com
January 2016
© Diodes Incorporated
AN204
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall
assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes
Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify
and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of,
directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and
markings noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is
the final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the
express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause
the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems,
and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systemsrelated information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated
and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices
or systems.
Copyright © 2016, Diodes Incorporated
www.diodes.com
AN204 3-Ch WD/TC SCL Bulb
Reference Design
Document number: Rev 1.0
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January 2016
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