Reference Design
AL9910EV8
Non-Dimmable 120V
AC
Evaluation Board
Case #1:
(Input=120V
AC
; Output=48V/90mA)
Case #2:
(Input=120V
AC
; Output=96V/45mA)
Applications:
B10
Light Bulbs
-Customer: Cree-
Date: October 27, 2011
This document contains Diodes confidential and proprietary information
AL9910EV8 120V
AC
ND Ref Design Report
October 2011
Table of Contents
1.
2.
2.1
2.2
2.3
2.4
2.5
3.
4.
4.1
4.2
5.
P
URPOSE
................................................................................................................... 3
E
VALUATION
B
OARD
I
NFORMATION
.............................................................................. 4
AL9910 Pin Assignment and Description
..................................................... 4
Evaluation Board Schematic
.......................................................................... 5
Evaluation Board BOM List
............................................................................ 6
Evaluation Board Layouts
.............................................................................. 8
Evaluation Board Snapshots
......................................................................... 9
LED O
UTPUT
........................................................................................................... 10
E
VALUATION
B
OARD
T
ESTING
S
UMMARY
................................................................... 11
Testing Results (case #1):
............................................................................ 11
Testing Results (case #2):
............................................................................ 12
C
ONCLUSION
............................................................................................................ 13
AL9910-EV8 (10/27/2011)
Page 2 of 14
AL9910EV8 120V
AC
ND Ref Design Report
October 2011
1. P
URPOSE
Introduction
We are using our AL9910 Non-Dimmable board to evaluate two test condition requirements using high-
power LEDs from Cree for functional performance.
1) Test condition requirement #1: VIN=120V
AC
; OUT=48V/90mA.
2) Test condition requirement #2: VIN=120V
AC
; OUT=96V/45mA.
Customer:
Cree
Features
Non-Dimmable
Selectable 5W-8W output power
Active PFC with power factor >0.9
No electrolytic capacitor
High temperature operation
Long operating life
Typical Applications: Retrofit B10/E27 LED Light Bulbs
Specifications
Parameter
AC Input Voltage
DC Output Voltage
Output Current
Output Power
Power Factor
Efficiency
Operating Ambient temperature
Operating Junction Temperature
ROHS Compliance
Units
V, AC
V, DC
mA
W
NA
%
C
C
NA
Value
90 - 140
40 – 98
45 - 90
3–6
>0.9
87%-90%
-40 to +85
-40 to +125
Yes
Test conditions:
Input Voltage:
120V
AC
, 60Hz
Output Voltage:
40V
DC -
98V
DC
Operating Ambient Temperature: -40°C to 85°C
Connection Instructions:
AC+ Input: Red – Hot
AC- Input: Black - Neutral
DC LED+ Output: LED+ (Red)
DC LED- Output: LED- (Black)
Board Dimension
(components included):
WxLxH (in mm) = 18mm x 25mm x 13mm
AL9910-EV8 (10/27/2011)
Page 3 of 14
AL9910EV8 120V
AC
ND Ref Design Report
October 2011
2. E
VALUATION
B
OARD
I
NFORMATION
2.1
AL9910 Pin Assignment and Description
AL9910 Pin Assignment
(Top View)
V
IN
CS
GND
Gate
1
2
3
4
SO-8
AL9910
8
7
6
5
Rosc
LD
V
DD
PWM_D
AL9910 Pin Description
Pin Name
V
IN
CS
GND
Gate
PWM_D
V
DD
LD
R
OSC
Pin Number
1
2
3
4
5
6
7
8
Description
Input voltage
Senses LED string current
Device ground
Drives the gate of the external MOSFET
Low Frequency PWM Dimming pin, also Enable input. Internal 100kΩ pull-down to
GND
Internally regulated supply voltage. 7.5V nominal for AL9910. Can supply up to 1 mA
for external circuitry. A sufficient storage capacitor is used to provide storage when
the rectified AC input is near the zero crossings
Linear Dimming by changing the current limit threshold at current sense comparator
Oscillator control. A resistor connected between this pin and ground sets the PWM
frequency.
AL9910-EV8 (10/27/2011)
Page 4 of 14
AL9910EV8 120V
AC
ND Ref Design Report
October 2011
2.2
Evaluation Board Schematic
2.1.1
Case #1
=> Test conditions: V
IN
=120V
AC
; OUT=48V/90mA
Figure 1: Evaluation Board Schematic (Case#1)
2.1.2
Case #2
=> Test conditions: V
IN
=120V
AC
; OUT=96V/45mA
Figure 2: Evaluation Board Schematic (Case#2)
AL9910-EV8 (10/27/2011)
Page 5 of 14
