|
|
PDF AL9910A-5 Data sheet ( Hoja de datos )
| Número de pieza | AL9910A-5 | |
| Descripción | UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AL9910A-5 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
AL9910/ AL9910A/ AL9910-5/ AL9910A-5
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
Description
The AL9910/A high voltage PWM LED driver-controller provides an
efficient solution for offline high brightness LED lamps from rectified
line voltages ranging from 85VAC up to 277VAC. The AL9910 drives
external MOSFETs at switching frequencies up to 300kHz, with the
switching frequency determined by a single resistor. The AL9910
topology creates a constant current through the LEDs providing
constant light output. The output current is programmed by one
external resistor and is ultimately determined by the external
MOSFET chosen and therefore allows many low current LEDs to be
driven as well as a few high current LEDs.
The LED brightness can be varied by both Linear and PWM dimming
using the AL9910’s LD and PWM_D pins respectively. The PWM_D
input operates with duty ratio of 0-100% and frequency of up to
several kHz.
The AL9910 can withstand input voltages up to 500V which makes it
very resilient to transients at standard mains voltages. As well as
standard SO-8 package the AL9910 is available in the thermally
enhanced SO-8EP package.
Pin Assignments
(Top View)
VIN
CS
GND
GATE
1
2
3
4
AL9910
8 ROSC
7 LD
6 VDD
5 PWM_D
SO-8
(Top View)
VIN
CS
GND
GATE
1
2
3
4
AL9910
8 ROSC
7 LD
6 VDD
5 PWM_D
SO-8EP
Features
• >90% Efficiency
• Universal Rectified 85 to 277VAC Input Range
• Input Voltage Up to 500V
• Internal Voltage Regulator Removes Start-Up Resistor
7.5V MOSFET Drive – AL9910
10V MOSFET Drive – AL9910A
• Tighter Current Sense Tolerance: 5% AL9910-5, AL9910A-5
• Drives LED Lamps with Both High and Low Current LEDs
• LED Brightness Control with Linear and PWM Dimming
• Internal Thermal Protection (OTP)
• Available in SO-8 and SO-8EP Packages
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• LED Offline Lamps
• High Voltage DC-DC LED Driver
• Signage and Decorative LED Lighting
• Back Lighting of Flat Panel Displays
• General Purpose Constant Current Source
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AL9910/ AL9910A/ AL9910-5/ AL9910-5A
Document number: DS35103 Rev. 9 - 2
1 of 15
www.diodes.com
May 2014
© Diodes Incorporated
1 page  
Typical Characteristics
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-40
-15 10 35 60
AMBIENT TEMPERATURE (°C)
85
Change in Current Sense Threshold vs. Ambient Temperature
10 0
90
80
ILED = 281mA
VIN = 264V
TA = 23.5C
70
60
50
40
30
20
10
0 0 50 100 150 200 250 300
VLD DIMMING CONTROL (mV)
IOUT MAX vs. VLD Dimming Control
1.5
1.0
0.5
0.0 ROSC = 226kΩ
-0.5
-1.0
ROSC = 1MΩ
-1.5
-2.0
-40 -15
10
35
60 85
AMBIENT TEMPERATURE (°C)
Change in Oscillation Frequency vs. Ambient Temperature
AL9910/ AL9910A/ AL9910-5/ AL9910A-5
46 0
44 0
42 0
VIN = 400V
40 0
38 0
VIN = 15V
36 0
34 0
32 0
30 0
28 0
-40
-15 10 35 60
AMBIENT TEMPERATURE (°C)
Input Current vs. Ambient Temperature
45 0
ILED(NOM) = 180mA
40 0
85
35 0
30 0
25 0
20 0
15 0
85 105 125 145 165 185 205 225 245 265
INPUT VOLTAGE (VRMS)
180mA LED Driver Short Circuit Output Current vs. Input Voltage
AL9910/ AL9910A/ AL9910-5/ AL9910-5A
Document number: DS35103 Rev. 9 - 2
5 of 15
www.diodes.com
May 2014
© Diodes Incorporated
5 Page 
AL9910/ AL9910A/ AL9910-5/ AL9910A-5
Applications Information (cont.)
DC-DC Buck LED Driver
The design procedure for an ac input buck LED driver outlined in the previous chapters equally applies DC input LED drivers.
When driving long LED chains care should be taken not to induce SBO – maximum LED chain voltage should be less half of VIN. So either
maximum duty cycle should be kept below 50% or use of constant off-time removes this issue.
DC-DC Boost LED Driver
Due to the topology of the AL9910 LED driver-controller it is capable of being used in boost configurations – at reduced accuracy. The accuracy
can be improved by measuring the LED current with an op amp and use the op amp’s output to drive the LD pin.
A Boost LED driver is used when the forward voltage drop of the LED string is higher than the input supply voltage. For example, the Boost
topology can be appropriate when input voltage is supplied by a 48V power supply and the LED string consists of twenty HB LEDs, as the case
may be for a street light.
C1
VIN
C2
L1
VDD
VIN
AL9910/A
Q1
PWM_D
GATE
LD
ROSC
GND
CS
ROSC
RSENSE
D1
C3
Figure 5. Boost LED Driver
In a Boost converter, when the external MOSFET is ON the energy is stored in the inductor which is then delivered to the output when the external
MOSFET switches OFF. If the energy stored in the inductor is not fully depleted by the next switching cycle (continuous conduction mode) the
DC conversion between input and output voltage is given by:
VOUT
=
VIN
1− D
Î
D=
VOUT − VIN
VOUT
From the switching frequency, fOSC, the on-time of the MOSFET can be calculated:
t ON
=
D
fOSC
From this the required inductor value can be determined by:
L
=
VIN ∗ tON
0.3 ∗ILED
The Boost topology LED driver requires an output capacitor to deliver current to the LED string during the time that the external MOSFET is on.
In boost LED driver topologies if the LEDs should become open circuit damage may occur to the power switch and so some form of detection
should be present to provide Over-voltage detection/protection.
AL9910/ AL9910A/ AL9910-5/ AL9910-5A
Document number: DS35103 Rev. 9 - 2
11 of 15
www.diodes.com
May 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AL9910A-5.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AL9910A-5 | UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER | Diodes |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |