AL8843Q DRIVER Datasheet

AL8843Q Datasheet, PDF, Equivalent


Part Number

AL8843Q

Description

AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LED DRIVER

Manufacture

Diodes

Total Page 18 Pages
Datasheet
Download AL8843Q Datasheet


AL8843Q
AL8843Q
AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LED DRIVER
Description
The AL8843Q 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 3A. Depending
upon supply voltage and external components, this converter can
provide up to 60W of output power.
The AL8843Q 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 0.3V or lower to the CTRL
pin will shut down the power switch.
The AL8843Q is available in the thermally enhanced SO-8EP package
and automotive compliant, qualified to AEC-Q100 Grade 1, supports
PPAP documentations.
Pin Assignments
(Top View)
GND 1
GND 2
SET 3
NC 4
EP
SO-8EP
8 SW
7 SW
6 VIN
5 CTRL
Applications
Automotive Daytime Running Lights
Automotive Front and Rear Fog Lights
Automotive Turn/Stop Lights
Automotive Dimmable Interior Lights
Features
Qualified to AEC-Q100 Grade 1
Wide Input Voltage Range: 4.5V to 40V
Output Current up to 3A
Internal 40V NDMOS Switch
Typical 4% Output Current Accuracy
Single Pin for On/Off and Brightness Control by DC Voltage or
PWM Signal
Recommended Analog Dimming Range: 10% to 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
SO-8EP Package Available in Green Molding Compound (No Br,
Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The AL8843Q suitable for automotive applications requiring
specific change control; this part is AEC-Q100 qualified,
PPAP capable, and manufactured in IATF 16949 certified
facilities.
https://www.diodes.com/quality/product-definitions/
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Refer to https://www.diodes.com/quality/.
AL8843Q
Document number: DS41943 Rev. 2 - 2
1 of 18
www.diodes.com
October 2019
© Diodes Incorporated

AL8843Q
Typical Applications Circuit
VIN: 4.5V to 40V
RSET
AL8843Q
VIN SET
C1
CTRL
AL8843Q
D1
GND
SW
L1
Pin Descriptions
Pin Number
1, 2
3
4
Pin Name
GND
SET
NC
5 CTRL
6 VIN
7, 8 SW
EP EP
Function
Ground of IC
Set Nominal Output Current Pin. Connect resistor RSET from this pin to VIN pin to define nominal
average output current.
No Connection
Multi-Function On/Off and brightness control pin:
Leave floating for normal operation.
Drive to voltage below 0.3V to turn off output current.
Drive with DC voltage (0.4V < VCTRL < 2.5V) to adjust output current from 10% to 100% of
IOUT_NOM.
Drive with an analog voltage > 2.6V output current will be 100% of IOUT_NOM.
A PWM signal (Low level voltage < 0.3V, High level voltage > 2.6V, transition time less than 1µs)
allows the output current to be adjusted over a wide range up to 100%.
Connect a capacitor from this pin to ground to increase soft-start time.
(Default soft-start time = 0.1ms. Additional soft-start time is approximate 1.5ms/1nF).
Input Voltage (4.5V to 40V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to
device.
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
Exposed pad/TAB. Connect to GND and thermal mass for enhanced thermal impedance.
AL8843Q
Document number: DS41943 Rev. 2 - 2
2 of 18
www.diodes.com
October 2019
© Diodes Incorporated


Features AL8843Q AUTOMOTIVE COMPLIANT 40V 3A STEP -DOWN LED DRIVER Description The AL884 3Q is a hysteresis mode DC-DC step-down converter, designed for driving single or multiple series connected LEDs effi ciently from a voltage source higher th an the LED voltage. The device can oper ate from an input supply between 4.5V a nd 40V and provide an externally adjust able output current up to 3A. Depending upon supply voltage and external compo nents, this converter can provide up to 60W of output power. The AL8843Q integ rates the power switch and a high-side output current sensing circuit, which u ses an external resistor to set the nom inal average output current. Dimming ca n be realized by applying an external c ontrol signal to the CTRL pin. The CTRL pin will accept either a DC voltage si gnal or a PWM signal. The soft-start ti me can be adjusted by an external capac itor from the CTRL pin to Ground. Apply ing a voltage of 0.3V or lower to the C TRL pin will shut down the power switch. The AL8843Q is availab.
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