AN201

AN201
2-Channel Tunable White / 1-Channel Dimmable White Smart Connected Light Bulb
Reference Design
“AP3983 (PSR Switcher) + AL1792 (2-Channel Linear CCR LED Driver)”
Jason Lo, Lighting Business Unit, Diodes Inc.
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 an A19 10W ZigBee-Enabled 2-channel
Tunable White SCL (2-ch TW SCL) bulb, capable of generating white light in the Correlated Color
Temperature (CCT) ranging from 2,700K to 6,500K. It serves as a good starting point for system designers
to further customize SCL bulb design to their desired performance and cost consideration. Driving emitter
strings with AL179X (multiple-channel LED driver) family, the 1-ch DW light bulb is a derivative design by
not populating components specifically for 2-ch TW (e.g. CCT emitters) and replacing AL1792 (2-ch LED
driver IC) with a pin-to-pin compatible AL1791 (1-ch LED driver IC).
KEY SPECIFICATION

Model:
A19-DD-UB-LO-2TW

Lamp Shape:
A19

Operating Power:
10W

Operating Voltage: 100V-240V

Frequency:
50/60Hz

Average Lifetime:
25,000Hrs

Bulb Base:
E26/E27

Lumen:
800 lm

CCT Range:
2,700K to 6,500K

CRI:
80Ra

Wireless:
ZigBee Module

Dimension (L*D):
113mm x 62mm
AN1101 2-Channel Tunable White Light
Bulb Reference Design
Document number: Rev 1.0
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FUNCTIONAL BLOCK DIAGRAM
AC
AC-DC Power
Conversion and
Power Management
Constant
Voltage
LED Driver Circuit
Constant Current and
PWM Controller
< PWM Control
Status >
3.3V DC
Wireless Command
Input
Constant
Current
LED
Emitter
Module

ACDC- AP3983C

LED Driver- AL1792

LDO- AP2204
Wireless Connectivity Module
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.
AN201 2-Channel Tunable White Light Bulb
Reference Design
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COMPLETE DESIGN SCHEMATICS
R3
L
C2
F1
D6
C1
BD1
R5
+ C4
1
VDR1
CX1
4
-
~
1
PT1
R9
D1
C5
D2
+
R4
3
D4
R11
C11
2
L1
D8
2
R6
~
N
R2
C3
PT2
R7
CN1
PT4
D5
3
+ C6
D3
4
D7
2
+ C7
1
C10
3
PT3
C9
LED+
LED1+
Gnd
R12
CON3*1_2mm
VCC
3
T1
U1
AP3983C/DIP-7
D
5,6
R8
R10
R13
R16
4
FB
2
CS
GND
7
CY 1
R15
1
CPC
R14
C8
Figure 2.a - AP3983C Power Board Schematics
LED+
R2
3.3V
R1
CN1
LED1+
Gnd
U2
3
2
1
U1 AP2204K-3.3TRG1
5
VIN
VOUT
1
3
C1
EN
GND
LED+
R3
1
2
ADJ/NC
2
CON3*1_2mm
4
C2
3
1.0uF
4
5
6
CN2
Wireless_Module (1.27mm)
3.3V
3.3V
GND
PWM1
PWM2
ANT
PWM4
EN
1
2
VIN
PWM4
REF
PWM3
FAULTB
PWM2
LEDPG
PWM1
LED4
LED1
LED3
LED2
GND
14
13
12
R4
11
R5
C3
10
9
8
AL1792AEF-13
3
4
5
6
7
A+
A-
ANT_G
PWM3
7
EN
LED1-
LED-
LED2- LED3-
ANT
CN3
(2.54mm)
3.3V
GND
PWM1
PWM2
PWM3
PWM4
EN
1
2
3
4
5
6
7
Figure 2.b - LED Driver - AL1792+M56 ZigBee Module Schematics
AN201 2-Channel Tunable White Light Bulb
Reference Design
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AN201
LED+
D1
D5
2700K
2700K
D2
D6
2700K
2700K
D3
D7
2700K
2700K
D4
D8
2700K
2700K
D9
2700K
D10
2700K
D11
2700K
D12
2700K
D13
6500K
D14
6500K
D15
6500K
D16
6500K
D17
6500K
D18
6500K
D19
6500K
D20
6500K
D21
6500K
D22
6500K
D23
6500K
D24
6500K
A1
ANTENNA
R1
0R
R2
0R
R3
0R
LEDLED2-
LED1LED1-
ANT
Figure 2.c - LED Emitter Module Schematics
AN201 2-Channel Tunable White Light Bulb
Reference Design
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APPLICATION DESCRIPTION

Power Board (PB) Application Description
The PB design (Figure 3) is based on AP3983C PSR AC/DC Switcher IC (integrated MOSFET switch) (refer to the
Key Component Section) to be capable of power rating up to 12W. To support both emitter strings and attached
MCU power, the PB outputs two CVs:

LED+ : 25V for driving emitter strings with adequate voltage headroom to Forward Voltage Drop (VF) and
AL1792 LED driver regulator (Refer to the Key Component Section)

LED1+ : 4.5V for deriving power to Wireless MCU
CN1
Figure 3 - AP3983C Power Board (58mmx27mm)
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.
Pin#
Pin Name
Functions
1
GND
2
LED1+
4.5V for driving power to Wireless MCU
3
LED+
25V for driving emitter strings and supplying AL1792
Ground
Note: Pin#1 is the one close to the edge of the PCB (long side).
CN1 - Pin Functions (Connected to LED Driver Board)
AN201 2-Channel Tunable White Light Bulb
Reference Design
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
Emitter Module Board (EMB) Application Description
The 2-Ch TW EMB (Figure 4) adopts two types of CCT Emitters, arranged in parallel-serial strings (3P4S - 3
Parallel and 4 Serial Emitters) as follows:
 2,700K CCT White Emitters (total of 12 Emitters 4S3P), CCTwarm
 6,500K CCT White Emitters (total of 12 Emitters 4S3P), CCTcold
The Forward Voltage Drop (VF) per emitter, with two 0.5W emitter dies in serial, is around 6.0V and the toal VF per
emitter sting is 24.0V (refer to Appendix II Emitter Spec). The cathodes of CCTwarm and CCTcold emitter strings are
attached to LED1 and LED2 pins of AL1792 IC, respectively.
The choices of numbers of emitters, emitter structure arrangement , and driving current are based on meeting the
required system specification (above 800 lumens for the finished light bulb).
Figure 4 - 2-Ch TW Emitter Module (Diameter - 46mm)
Pin#
Pin Name
Functions
LED+
+25V
LED1-
6500K LED-
The soldering pad is attached to the cathode of LED(6500K)
emitter string.
LED-
2700K LED-
The soldering pad is attached to the cathode of LED(2700K)
emitter string.
A1
Antenna
The soldering pad is attached to the common anode of
LED(6500K) and LED(2700K) emitter strings.
The soldering pad is attached to the Antenna chip.
Output / Input Pin Functions
AN201 2-Channel Tunable White Light Bulb
Reference Design
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
LED Driver Board (LDB) Application Description
In this 2-Ch TW SCL bulb design, the REF (reference current setting resistor) for LED Driver circuit is 9.1KΩ (R4 in
Figure 2.b) to regulate a total channel current around 330mA for both LED1 and LED2 of AL1792. The LED input
power for each fixed CCT emitter strings is around 8.0W (24V*330mA). By applying suitable PWM signal patterns
to both CCTwarm and CCTcold emitter strings (2,700K and 6,500K), CCT tuning ranging from 2,700K to 6,500K can
be achieved.
Note that an wireless chip antenna (A1) is placed on the EMB for wireless connectivity.
CN1
CN2
CN3
Figure 5 - AL1792 LED Driver Module (30mmx24mm)
Pin#
Pin Name
Functions
1
GND
2
LED1+
4.5V input, supplying LDO for Wireless MCU.
3
LED+
25V input, for driving emitter strings and supplying
AL1792
Ground.
CN1 - Pin Functions (Connected to Power Board)
Pin#
Pin Name
1
3.3V
This Pin is attached to the output 3.3V of LDO,
For M56 ZigBee module VDD input.
2
GND
Ground
3
PWM1
This pin is attached to the PWM1 of U2_AL1792,
Connected to PWM_01 of M56 ZigBee Module, for controlling
6500K emitter string.
4
PWM2
This pin is attached to the PWM2 of U2_AL1792,
Connected to PWM_02 of M56 ZigBee Module, for controlling
2700K emitter string.
5
PWM3
This pin is attached to the PWM3 of U2_AL179X,
Connected to PWM_03 of M56 ZigBee Module.
AN201 2-Channel Tunable White Light Bulb
Reference Design
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Functions
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6
PWM4
7
EN
This pin is attached to the PWM4 of U2_AL179X,
Connected to PWM_04 of M56 ZigBee Module
This pin is attached to the EN of U2_AL1792,
Connected to GPIO of M56 ZigBee, to control on/off function of
U2_AL1792.
CN2 and CN3- Pin Functions (Connected to ZigBee Module)
Pin#
Pin Name
Functions
LED+
+25V
25V, for driving emitter strings.
LED1+
+4.5V
4.5V, (Reserved for future use)
LED1-
6500K LED-
This soldering pad is attached to the LED1 pin of U2_AL1792,
and connected to the cathode terminal of LED1- (6,500K).
LED-
2700K LED-
This soldering pad is attached to the LED2 pin of U2_AL1792,
and connected to the cathode terminal of LED- (2,700K).
LED2-
LED3
This soldering pad is attached to the LED3 pin of
U2_AL179X,Connected to LED cathode terminal (Reserved for
future use)
LED3-
LED4
This soldering pad is attached to the LED4 pin of
U2_AL179X,Connected to LED cathode terminal (Reserved for
future use)
Output / Input Pin Functions ( Connected LED Emitter Board)

M56 Zigbee Module (ZM) Application Description
For the wireless connectivity, it is enabled by embedding M56 ZigBee Module (Appendix III) inside the 2-ch TW
SCL bulb by piggybacking on the other side of the AL1792 LED driver board. Embedded ZigBee Light Link (ZLL) in
the flash memory, M56 ZigBee module will communicate ZLL commands with a ZLL-capable Gateway Hub.
This ZigBee module board is piggybacking on the LED driver board on the side opposited to the Power Board.
Pin1~7 Connected to CN2.
7 6 5 4
3 2 1
Figure 6 - M56 ZigBee Module (15mm x 15mm)
AN201 2-Channel Tunable White Light Bulb
Reference Design
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Output Assembly Description

CN2
CN1
LEDs
Common Anode
Antenna cable
2700K cathode
6500K cathode
CN3



Figure 7 - Power Board + LED Driver Board + M56 ZigBee board
Two green wires connected to AC input
Three wires for Emitter:
1.
Yellow wire connected to LED’s Common Anode
2.
Black wire connected to LED_ 2700K cathode
3.
White wire connected to LED_ 6500K cathode
Antenna Cable from M56 Zigbee Module connected to A1 ”Antenna Chip” of Emitter board
AN201 2-Channel Tunable White Light Bulb
Reference Design
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PERFORMANCE TESTING
The key system performance parameters of 2-ch TW SCL bulb are summarized in Table 1 below.
10W A19 2-Channel Tunable White Reference Light Bulb
Item No
Parameter
Condition
Test Result
1
Input Voltage Range
100-240VAC ~ 50/60Hz
2
Power Factor
> 0.7
(LED1: 330mA, LED2: No Load)
110VAC: 0.85
230VAC: 0.73
3
Efficiency - PB Only
~ 85%
(at LED1: 330mA, LED2: No Load)
110VAC: 82.15%
230VAC: 84.9%
4
Standby Power
< 0.5Watt (M56 ZigBee module
Operating Current is about 33mA )
110VAC/60Hz: 378mW;
230VAC/50Hz: 450mW
5
Start-Up Time
from Wall Switch
110VAC
(1.1MΩ+1.1MΩ Startup Resistor)
1.33 Sec
6
Output Ripple Voltage
(Vpeak-to-peak)
Test Condition at 230 VAC
LED1: 330mA
LED2: 40mA
LED+_25V: 90mV (±1.9%)
LED1+_5V: 56mV (±1.2%)
7
THD (Total Harmonic
Distortion)
Test Condition
LED1: 330mA
LED2: No Load
110VAC/60Hz: 51.58%
230VAC/50Hz: 72.21%
8
Temperature of AL1792
< 105°C
70°C (Open Cover)
9
Line Regulation
LED+_25V = 26.06~24.93V
LED1+_5V = 5.46~5.09V
10
Load Regulation
LED+_25V = 26.06~22.7V
LED1+_5V = 5.46~3.8V
Table 1 - System Performance Testing of 2-ch TW SCL Bulb
AN201 2-Channel Tunable White Light Bulb
Reference Design
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Using a light measurment device (e.g. Integrating Sphere), key parameters of light outputs for a 2-Ch TW SCL bulb
is measured and summarized in Table 2.
Based on the measured results, we could conclude that:
A19 10W 2-Ch TW SCL bulb could deliver desired output (over 800 lumens) at reasonable light quality (CRI > 80)
and achieve a CCT Tuning with range from 2,700K to 6,500K with acceptable result (Duv < 0.006). The metric
"Duv" is primarily used in connection with the expression of a “generally white” chromaticity in terms of CCT and
Planckian locus offset.
No.
1
2
3
4
5
6
7
8
9
10
11
PWM cold (%)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
PWM warm (%)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Lumen
824
826
843
872
883
882
892
886
878
870
864
Efficacy
(Lumen/Watt)
78.40
79.19
80.98
83.77
84.74
84.56
85.60
85.03
84.18
83.49
82.52
CCT (K)
2675
2874
3094
3331
3600
3909
4243
4637
5098
5622
6243
CIE x
0.4634
0.4446
0.4274
0.4119
0.3969
0.3824
0.3692
0.3558
0.3424
0.3297
0.3168
CIE y
0.4136
0.4039
0.3953
0.3875
0.3796
0.3719
0.3652
0.3579
0.3502
0.3434
0.3366
CIE u'
0.2634
0.2556
0.2482
0.2414
0.2348
0.2284
0.2223
0.2162
0.2102
0.2041
0.1978
CIE v'
0.529
0.5225
0.5164
0.5109
0.5053
0.4997
0.4947
0.4893
0.4836
0.4783
0.4729
0.0008 -0.0010 -0.0022 -0.0028 -0.0031 -0.0029 -0.0021 -0.0010 0.0004
0.0024
0.0050
Duv
Ra
81.4
83.1
84.6
85.8
86.6
87.0
87.0
86.8
86.2
85.6
84.2
Input Power (W)
10.51
10.43
10.41
10.41
10.42
10.43
10.42
10.42
10.43
10.42
10.47
PF
0.883
0.883
0.883
0.883
0.883
0.882
0.882
0.882
0.882
0.883
0.883
V LED+ (V)
24.7
24.7
24.7
24.7
24.7
24.7
24.7
24.7
24.7
24.7
24.7
I LED+ (mA)
344
342
342
342
342
342
342
342
342
342
342
1.28
1.14
1.14
1.14
1.02
0.98
0.90
0.86
0.82
1.02
N/A
N/A
1.00
0.84
0.84
0.84
0.84
0.84
0.84
0.88
0.98
0.98
Headroom (2700K)
V_LED- _ON [V]
Headroom (6500K)
V_LED1- _ON [V]
Table 2 - Light Output Measurement of 2-Ch TW SCL Bulb @110VAC
AN201 2-Channel Tunable White Light 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) Thermal Management
While 2-ch TW SCL bulb is 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) BD1 (DF06S)
2) Passive Valley Fill (PVF) Circuit: C4, C6, D1, D3 and D4 (see figure 2.a on page 3)
AP3983C, 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 Start Compliance requirement, the Power Factor (PF) for over 5W light bulb need to be over 0.70. As
the AP3983C does not have built-in Active Power Factor circuitry, a PVF Circuit, consists of C4, C6. D1, D3 and
D4 is designed to achieve desired PF over 0.7. A high PF value could be achieved by using larger capacitors (C4
and C6), however the trade-offs will be a 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 10W typical 2-ch TW SCL bulb needs to be above 75% based on the proposed two-stage
designs. For the Power stage (first stage) efficiency, it is designed to achieve 85%. The factors impacting power
board efficiency include:
1) CV Output Voltage
2) Pre-loading circuit (D8, R4, R9 and R12, see figure 2.a on page 3) 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 (D6, D7, see figure 2.a on page 3)
While fixed-CCT 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.
In the 2-ch TW SCL bulb design, the standby power consumption is measured with estimated breakdown as
follows:
1) AL1792 IC 50 mW (Quiescent Supply Current of AL1792 EN Enable)
2) Dummy Loading 50 mW (Added 22V zener diode between LED+ and LED1+)
3) Start-up Resistor Circuit - 50 mW (R5 and R6 are 1M/1206 resistor)
4) ZigBee Module 300 mW (UBEC M56 ZigBee Module standby current is 35mA)
5) Others Power Loss50 mW (AP3983, Snubber and Switching Loss)
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Reference Design
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
Improved Power Consumption Suggestion

Startup Circuit
For low-cost implementation, a simple start-up circuity is adopted (R5 and R6, see figure 2.a on page 3). Tradeoffs involved are start-up time (time when LED light could be turned on upon instruction to actual light output) and
standby power consumption. Increasing the value of resistance of R5 and R6, the standby power will decrease at
the expense of longer start-up time (Table 3).
Values of R5 & R6
startup time at 110VAC
(after fully whole circuit discharged)
Standby Power at 230VAC
LED OFF Mode (<0.5W)
two 1.1M = 2.2MΩ
1.33 Sec
450 mW
two 510K = 1020KΩ
0.62 Sec
470 mW
two 392K = 784KΩ
0.20 Sec
508 mW
*Vcc cap(C7)=4.7uF/50V
Table 3 - Start-Up Resistor Circuit on Startup Time and Standby Power
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 consumption (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

AL1792 Standby consumption
MCU can enable/disable the “EN” (Enable Pin) to save power while the AL1792 IC is in standby mode.
Input AC
AL1792 Standby Power
With EN Enable
AL1792 Standby Power
With EN Disable
Improved Power Saving
At 110VAC
378mW
350mW
28mW
At 230VAC
450mW
425mW
25mW
Table 4 - AL1792 Enable/Disable Power Consumption
AN201 2-Channel Tunable White Light Bulb
Reference Design
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
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, VF 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 (The Circuit is not shown). The CV output of The 2-ch TW SCL bulb
design is in the range of 25V down to 23.5V.
1
PT1
VCC
3
2
U1
AP3983C/DIP-7
PT2
5,6
D
R10 10K
(NTC)
4
R16
2
FB
CS
47K
R8 5.6K
3
PT3
7
GND
R15
13K
T1
EE16
1
CPC
4
Figure 8 - Thermal Management Circuit
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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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), Over Voltage Protection (OVP), Over Temperature Protection (OTP)

Short Circuit Protection (SCP) with hiccup

3-Segment Drive Current for Radiative EMI Suppression
Pin
Symbol
Name
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
Descriptions
The pin is connected with an internal power MOSFET's drain.
The pin is the signal reference ground.
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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AN201

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
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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
AL1791/2/3/4 Pin Descriptions
Pin
Part Number
Name
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
Descriptions
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.
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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Bill of Material – ACDC Board
#
Name
QTY
Part Number
Manufacturer
Description
1
U1
1
AP3983C/DIP-7
Diodes, Inc.
ACDC PSR converter (Build in 650V MosFET)
2
BD1
1
DF06S
Diodes, Inc.
600V/1A Bridge Diode
3
D1, D2, D3,
D4, D5
5
4
D6
1
SBR1U200P1
Diodes, Inc.
1A200V Surface mount super barrier rectifier
POWERDI® 123
5
D7
1
DFLS160-7
Diodes, Inc.
1.0A/60V surface mount Schottky barrier rectifier
POWERDI® 123
6
C4,C6
2
10uF/200V/8*14
Without Valley Fill. C4 and C6 need to be changed
to 4.7uF/400V.
7
C5
1
470uF/35V/10*16
LED+ output filter capacitor
8
C9
1
220uF/16V/6.3*11
LED1+ output filter capacitor
9
C7
1
4.7uF/50V/5*11
AP3983C startup and VCC hold-up capacitor
10
C8
1
0.1uF/50V/0603
AP3983C output cable compensation
11
C1,C2
2
1nF/1KV/1206
Snubber capacitor
12
C3
0
-
Not fitted. (Snubber capacitor)
13
C10
0
-
Not fitted. (Snubber capacitor)
14
C11
1
0.22uF/450V
EMI filter
15
CX1
1
0.047uF/275VAC
EMI filter
16
CY1
1
1000pF/Y1
EMI capacitor
17
R5,R6
2
1.1M/1206
Startup resistor (must for high voltage
stress >200V)
18
R1
1
0R/0805
Jumper resistor
19
R2
1
100K/1206
Snubber resistor
20
R3
1
10R/1206
Snubber resistor
21
R7
1
2R/0805
Snubber resistor
22
R8
1
5.6K/0603
AP3983C voltage feedback resistor
23
R10
1
10K/0603
AP3983C voltage feedback resistor
24
R16
1
47K/0603
AP3983C voltage feedback resistor
25
R15
1
13K/0603
AP3983C voltage feedback resistor
26
R13, R14
2
2R/1206
AP3983C current sense resistor
27
D8
1
BZT52C22-7-F
28
R4,R9,R12
0
-
Not fitted. (For dummy load)
29
R11
0
-
Not fitted. (Snubber resistor)
30
T1
1
EE16
31
F1
1
T1A-T250V
32
CN1
1
CON3*1_2mm
DFLR1600,
Diodes, Inc.
POWERDI 123
1.0A surface mount glass passivated rectifier
NO need for D1, D3, D4 for low PF (< 0.7) design
Valley Fill Input Bulk Capacitor
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
Diodes, Inc.
Emax
Fitted a 22V zener diode, for pre load of "LED+"
EE16 Transformer
(NP:NA:NS_25V:NS_5V=118: 19: 23: 6; 0.82mH)
Fuse
CviLux
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Output connector
October 2015
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AN201
(CH1101S)
33
L1
1
1.0mH/6Φ I core
EMI filter inductance
34
VDR1
1
471K
Surge Absorber
TOTAL
38
Power Board Electronic Parts
Bill of Material – LED Driver Board
#
Name
QTY
Part Number
Manufacturer
Description
1
U1
1
AP2204K3.3TRG1
Diodes, Inc.
Wide input voltage range, 150mA ULDO regulator,
SOT23-5
2
U2
1
AL1792AFE-13
Diodes, Inc.
Dual channel LED driver with analog and PWM
dimming U-DFN-4030-14
Replace AL1792 with AL1791 for 1-ch DW
3
R4
1
9.1K/1206
AL1792 LED current setup resistor
4
R5
0
-
Not fitted
5
R1,R2,R3
3
10K/1203
6
R9,R10
2
0R/0603
7
R6,R7
2
0R/0603
8
C1
1
1.0uF/50V/0805
9
C2
1
4.7uF/6.3V/0805
10
C3
1
0.1uF/50V/0805
11
CN2
1
12
CN3
0
TOTAL
Pitch 1.27mm
7Pin (CH0101S)
Pitch 2.54 7pin,
(CH3101S)
CviLux
For M56 ZigBee module
CviLux
Being used for CDK module
14
LD board electronic parts
Bill of Material – Emitter Board
#
Name
QTY
Part Number
Manufacturer
Description
D1, D2, D3, D4, D5,
1
D6, D7, D8, D9, D10,
12
LTW3030DZL27
LITEON, Inc.
12
LTW3030DZL65
LITEON, Inc.
LTW-3030DZL Emitter Series
D11, D12
D13, D14, D15, D16, D17
2
D18, D19, D20, D21, D22
D23, D24
LTW-3030DZL Emitter Series
(NO need for 1-ch DW light bulb)
3
R1
1
0R/0805
Jumper
4
R2, R3
2
0R/1206
Jumper(Reserved for future use)
1
ANT3216LL11R
2400A
5
A1
TOTAL
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
28
LD Board Electronic Parts
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AN201
APPENDIX I - EE16 TRANSFORMER SPEC
EE16 transformer with (Appendix X).
A. Transformer Pin & Wire Description:
Circuit：
Primary
Cross sectional view：
Secondary
1
3Ts
PT1
Over core
L1
2Ts
L5
L2
8
2Ts
PT2
L3
L2
2Ts
L4+L5
2
PT4
L5
4
2Ts
L4
F1 Wire Shilding
L3
1T
PT3
3
Start
Teflon Tube
F1
3
L1
Pin definition
(StartEnd)
Wire (φ)
Turn (Ts)
Layers
Layers of Tape
L1
1 8
2UEW-B 0.21mm x 1P
72
2
1T
F1
3
2UEW-B 0.1mm x 1P
75
1
2Ts
L5
PT2 PT1
Triple wire-B 0.35mm x 1P
23
1.5
L4
PT3 PT4
Triple wire-B 0.35mm x 1P
6
0.5
2Ts
L3
3 4
2UEW-B 0.2mm x 1P
19
1
2Ts
L2
8 2
2UEW-B 0.21mm x 1P
46
2
2Ts
OVER CORE
B.
Electrical Characteristic :
#
2.1
Test Item
Winding
Pin
Rating
Unit
Tolerance
Remark
Inductance
L1 and L2
1→2
0.82
mH
+/-5%
@ 100KHz / 1V
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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AN201
APPENDIX II - LITEON OPTO 2-CHANNEL TW EMITTER MODULE

LTW-3030DZL Emitter Series (LTW-3030DZL27 and LTW-3030DZL65) -

Typical Performance
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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AN201
SINGLE Voltage to Emitter Strings based on LiteON 10W Emitter Module
Item
Category
Channel 1 - Cold Channel 2 - Warm
CCT White
CCT White
1
Current (mA)
330.0
330.0
2
Voltage / Emitter (volts)
6.06
6.06
3
No. of Emitters
4
Total
660.0
Comment
Rset = 9.1KΩ for 330mA
(Channel 1 and 2)
Two Die in one Emitter,
VF/Emitter = 6.11V
8
* Two emitter strings (6,500K
and 2,700K), Each emitter has 3
parallel strings of 4 emitters in
serial.
4
4
VF of Emitter String
24.24
24.24
5
Voltage Supply LED+
(volts)
24.74
24.74
6
LED Input Power (Watt)
7.999
7.999
7
Luminous Flux / Spec
Drive Current
1,010.0
1,010.0
8
Spec Drive Current
120.0
120.0
* 3 Emitter string, each emitter
string has 4 serial emitters
9
Potential Luminous Flux
(lm)
925.8
925.8
* Linearly scale lumen to
110mA vs 120mA
10
Effective Lumen Output
(lm)
805.5
805.5
87.0%
11
Total Input Power to
Emitter + IC
8.164
8.164
8.164
12
Power Efficiency (%)
98.0%
98.0%
98.0%
* Assume +0.5V voltage
headroom
7.999
* Lm for one emitter (3 *
@120mA)
* Assuming 87% from emitters
to lamp lumens
Contact LiteON Opto (光寶科技)
Web Site: www.liteon.com/opto
Contact: Eddie Su ([email protected])
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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APPENDIX III - ZIGBEE MODULE M56 (UBEC)

Introduction and Specification
 M56 Module:
2.4GHz RF module which integrates UBEC’s low power 2.4GHz
IEEE802.15. 4 RFIC UZ2400D
 MCU:
ARM M0-Cotex Low Power Design
 Voltage Input:
2.7V ~ 3.6V
 TX Current (@3.3V, 32MHz):
37.09mA
 RX Current (@3.3V, 32MHz):
33.76mA
 Temperature Range:
-20°C ~ 105°C
 Dimension:
15mm x 15mm
Functions
Pin#
Pin Name
1
VDD
Connected to LED driver board - 3.3V
2
GND
Connected to LED driver board Ground
3
PWM_01
Connected to LED driver board – PWM1 of AL1792
To control 6,500K LED
4
PWM_02
Connected to LED driver board – PWM2 of AL1792
To control 2,700K LED
5
PWM_03
Connected to LED driver board – Reserved for future use
6
PWM_04
Connected to LED driver board – Reserved for future use
7
EN
Connected to AL1792 Pin#1-EN, Enable AL1792.
Output Pin Functions (Connected to LED Driver Board Module)
M56 ZigBee Module Outline Drawing
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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AN201

Schematic and Connection Definition
Pin#
Pin Name
Functions
Remark
1
TX
UART1 data transmitter output pin
Connected to GPB5
2
RX
UART1 data receiver input pin
Connected to GPB4
3
NRST
4
SWDAT
ICE_SWDAT
5
SWCLK
ICE_SWCLK
RST
J1 - Serial Wire Debug Port
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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AN201
Pin#
Pin Name
Functions
1
VDD
+3.3V
2
GND
Ground
3
PWM_01
PWM 0 channel 0 output, GPIO, (PA. 12)
6,500K
4
PWM_02
PWM 0 channel 1 output, GPIO, (PA. 13)
2,700K
5
PWM_03
PWM 0 channel 2 output, GPIO, (PA. 14)
6
PWM_04
PWM 0 channel 3 output, GPIO, (PA. 15)
7
EN
2
GPIO, I C 1 SDA, (PA. 10)
Remarks
EN
2
8
FAULTB
GPIO, I C 1 SCL, (PA. 11)
9
LEDPG
GPIO, ADC, (PA. 0)
10
TEM-D
Not Available
11
VADJI I/D
GPIO, DAC (PC. 7)
J2 - Application Usage
Contact UBEC:
Headquarters
Address: 6F-1, No. 192, Dongguang Rd., Hsinchu, 300 Taiwan
Tel: +886-3-5729898
Fax: +886-3-5718599
Website: http://www.ubec.com.tw
Sales Services
E-mail: [email protected]
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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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 © 2015, Diodes Incorporated
www.diodes.com
AN201 2-Channel Tunable White Light Bulb
Reference Design
Document number: Rev 1.0
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