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PDF AL8807B Data sheet ( Hoja de datos )
| Número de pieza | AL8807B | |
| Descripción | HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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1. AL8807B  Hay una vista previa y un enlace de descarga de AL8807B (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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AL8807B
HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER
Description
The AL8807B is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to 9 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 6V to 36V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8807B switches at frequency up
to 1MHz with controlled rise and fall times to reduce EMI. This
allows the use of small size external components, hence minimizing
the PCB area needed.
Maximum output current of AL8807B is set via an external resistor
connected between the VIN and SET input pins. Dimming is
achieved by applying a PWM signal at the CTRL input pin. An input
voltage of 0.4V or lower at CTRL switches off the output MOSFET
simplifying PWM dimming.
Pin Assignments
SET
GND
GND
CTRL
(Top View)
MSOP-8EP
VIN
N/C
SW
SW
Features
LED driving current up to 1.3A
Better than 5% accuracy
High efficiency up to 96%
Optimally controlled switching speeds
Operating input voltage from 6V to 36V
PWM input for dimming control
Open-Circuit LED protection
LED Chain Short Circuited
Over-Temperature Protection
MSOP-8EP Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
MR16 lamps
General illumination lamps
12V powered LED Lamps
24V powered LED Lamps
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.
Typical Application Circuit
D1 R1
VIN:
6 ~ 36V
C1 AL8807B
PWM Dimming
Input:
C2
L1
AL88070B
Document number: DS36191 Rev. 1 - 2
1 of 18
www.diodes.com
March 2014
© Diodes Incorporated
Free Datasheet http://www.0PDF.com
1 page  
Typical Performance Characteristics (cont.) (@TA = +25°C, unless otherwise specified.)
AL8807B
Figure 7 ILED vs. PWM Duty Cycle
Figure 8. Duty Cycle vs. Input Voltage
Figure 9. Efficiency vs. Input Voltage
Figure 10. On-time vs. Input Voltage
Figure. 11 SW Output Rise Time
AL88070B
Document number: DS36191 Rev. 1 - 2
5 of 18
www.diodes.com
Figure. 12 SW Output Fall Time
March 2014
© Diodes Incorporated
Free Datasheet http://www.0PDF.com
5 Page 
AL8807B
Applications Information (cont.)
Figures 35 and 36 show the PWM dimming performance of the AL8807B with a range of PWM frequencies with a nominal switching frequency of
530kHz.
Figure 35 PWM Dimming at 530kHz nominal switching frequency
Looking at difference between duty cycle and percentage of full scale LED current yields a “Linearity Error”:
Figure 36 PWM Dimming Non-Linearity at 530kHz nominal switching frequency
The accuracy of the PWM dimming is affected by both the PWM frequency and also the switching frequency of the AL8807B. For best
accuracy/resolution the switching frequency should be increased while the PWM frequency should be reduced.
The CTRL pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push pull
output stage.
AL88070B
Document number: DS36191 Rev. 1 - 2
11 of 18
www.diodes.com
March 2014
© Diodes Incorporated
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AL8807B.PDF ] | |
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