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AL8860

40V 1.5A BUCK LED DRIVER


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AL8860 pdf
AL8860
40V 1.5A BUCK LED DRIVER
Description
The AL8860 is a hysteresis mode DC/DC step-down converter,
designed for driving single or multiple series connected LEDs
efficiently from a voltage source higher than the LED voltage. The
device can operate from an input supply between 4.5V and 40V and
provide an externally adjustable output current up to 1A for TSOT25
package and 1.5A for MSOP-8EP package. Depending upon supply
voltage and external components, this converter can provide up to 40
watts output power.
The AL8860 integrates the power switch and a high-side output
current sensing circuit, which uses an external resistor to set the
nominal average output current.
Dimming can be realized by applying an external control signal to the
CTRL pin. The CTRL pin will accept either a DC voltage signal or a
PWM signal.
The soft-start time can be adjusted by an external capacitor from the
CTRL pin to ground. Applying a voltage of 0.2V or lower to the CTRL
pin can turn off the output and make the device enter into standby
state with low current consumption.
Features
Low BOM Counts
Wide Input Voltage Range: 4.5V to 40V
Output Current Up to 1.5A
Internal 40V NDMOS Switch
Typical 5% Output Current Accuracy
Single Pin for On/Off and Brightness Control by DC Voltage or
PWM Signal
Recommended Analog Dimming Range: 5% ~100%
Soft-Start
High Efficiency (Up to 97%)
LED Short Protection
Inherent Open-Circuit LED Protection
Over Temperature Protection (OTP)
Up to 1MHz Switching Frequency
Pb-Free TSOT25 and MSOP-8EP Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
TSOT25
(Top View)
MSOP-8EP
Applications
LED Retrofit for Low Voltage Halogen
Low Voltage Industrial Lighting
Illuminated Signs
External Driver with Multiple Channels
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.
AL8860
Document number: DS39014 Rev. 1 - 2
1 of 17
www.diodes.com
September 2016
© Diodes Incorporated



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AL8860 pdf
Typical Applications Circuit
AL8860
Pin Descriptions
Pin Number
TSOT25 MSOP-8EP
1 5,6
2 2,3
34
41
58
Pin Name
Function
SW
GND
CTRL
SET
VIN
Drain of NDMOS switch.
Ground (0V)
Multi-function On/Off and brightness control pin:
Leave floating for normal operation.
Drive to voltage below 0.2V to turn off output current
Drive with DC voltage (0.3V < CTRL< 2.5V) to adjust output current from 0 to 100% of IOUT_NOM
Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.
Linear adjustment range from 1% to 100% of IOUT_NOM for f < 500Hz
Connect a capacitor from this pin to ground to increase soft-start time.
(Default soft-start time = 0.1ms. Additional soft-start time is approx.1.5ms/1nF)
Connect resistor RS from this pin to VIN to define nominal average output current: IOUT_NOM = 0.1/Rs
Input voltage (4.5V to 40V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to
device.
Functional Block Diagram
VIN
5(8)
SET
4(1)
SW
1(5,6)
4.5V
VDD
Generator 4.5V_Drv
Current
Monitor
BG &
Reference
Ref
Hysteresis
Control
Comp
PWM Logic & Driver
AB
A for TSOT25
B for MSOP-8EP
CTRL
3(4)
AL8860
Document number: DS39014 Rev. 1 - 2
PWM/DC PWM
Dimming
OTP
OTP
AL8860
2 of 17
www.diodes.com
2(2,3)
GND
September 2016
© Diodes Incorporated



Part Number AL8860
Description 40V 1.5A BUCK LED DRIVER
Maker Diodes - Diodes
Total Page 17 Pages
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