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Diodes Semiconductor Electronic Components Datasheet

AL1791 Datasheet

Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver

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AL1791 pdf
AL1791/1792/1793/1794
Description
Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver
with Analog and PWM Dimming
U-DFN-4030-14
Pin Assignments
The AL1791/1792/1793/1794 (or collectively AL179x), a single/multi-
channel LED driver with analog and PWM dimming control, is
targeted for Tunable White/Color Smart Lighting application. It serves
as the LED driving element along with AC-DC Power Conversion
Block and Intelligent wireless MCU as an emerging smart-connected
lighting system configuration. The key merits attribute to cost-
effectiveness, dimming performance, low standby power, ease of
system implementation, and great scalability. AL1791, AL1792,
AL1793, and AL1794 are 1-channel, 2-channel, 3-channel, and 4-
channel LED drivers, respectively.
Top View
(U-DFN4030-14)
EN 1
PWM4/GND 2
PWM3/GND 3
PWM2/GND 4
14 VIN
13 REF
12 FAULTB
11 LEDPG
The IC is available in U-DFN-4030-14 package.
PWM1 5
10 LED4/GND
LED1 6
9 LED3/GND
LED2/GND 7
8 GND
Features
Input Voltage Range: 6.5V to 30V
1/2/3/4-channel LED drivers: independent Analog or PWM
dimming control for each channel
Reference Current: Adjustable by an external reference resistor
Ratio-optimized currents for 4 independent LED channels
(AL1794 only): Suitable for Tunable White and Tunable Color
Low Standby Power: With EN pin
E-flicker free High Frequency PWM dimming with Deep Dimming
Capability: Support 10KHz down to 1.0%, 4KHz down to 0.4%,
or 1KHz down to 0.1%
Internal Protections: Under Voltage Lockout (UVLO), LED string
open/short protection
Over-temperature protection (OTP): Thermal shutdown and auto
thermal recovery
Fault Reporting: UVLO, OTP, Open, and Short LED Power
Good Reporting
Low system BOM cost
Ambient Temperature Range -40°C to +125°C
U-DFN4030-14: 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)
Applications
1-Channel Dimmable Smart Connected Light (SCL)
Bulbs
2-Channel Tunable White SCL Bulbs
3-Channel Tunable White or Color SCL Bulbs
4-Channel Tunable White+Color SCL Bulbs
Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling
Lights
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.
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
1 of 18
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL1791 Datasheet

Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver

No Preview Available !

AL1791 pdf
Typical Applications Circuit
AL1791/1792/1793/1794
85~265Vac
VIN adjustment
signal
AP3983C
AC-DC
Conversion
VLED1
VIN
3.3V
RFAULT
RLEDPG
Wireless/Color
management
MCU
AL1791
FAULTB
LEDPG
EN
PWM1
2700K
X8
LED1
REF
GND
RSET
Figure 1. 1-Channel Dimmable White
85~265Vac
VIN adjustment
signal
AP3983C
AC-DC
Conversion
VLED1
VIN
3.3V
RFAULT
RLEDPG
Wireless/Color
management
MCU
AL1792
FAULTB
LEDPG
EN
PWM1
PWM2
2700K
X8
LED1
LED2
REF
GND
6500K
X8
RSET
Figure 2. 2-Channel Tunable White
VLED2
85~265Vac
VIN adjustment
signal
AP3983C
AC-DC
Conversion
VLED1
VIN
3.3V
RFAULT
RLEDPG
Wireless/Color
management
MCU
AL1794
FAULTB
LEDPG
EN
PWM1
PWM2
PWM3
PWM4
LED1
LED2
LED3
LED4
REF
GND
Figure 3. 3-Channel Tunable Color
G RB
RSET
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
2 of 18
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL1791 Datasheet

Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver

No Preview Available !

AL1791 pdf
AL1791/1792/1793/1794
Typical Applications Circuit (continued)
VLED2
85~265Vac
VIN adjustment
signal
AP3983C
AC-DC
Conversion
VLED1
VIN
3.3V
RFAULT
RLEDPG
Wireless/Color
management
MCU
AL1793
FAULTB
LEDPG
EN
PWM1
PWM2
PWM3
LED1
LED2
LED3
REF
GND
G RB
VIN
RSET1
AL1791
LED1
FAULTB
LEDPG
EN
PWM1
REF
GND
W
RSET2
Figure 4. 4-Channel White+Tunable RGB
Detailed Description
The AL1791, AL1792, AL1793, and AL1794 are single-channel, dual-channel, triple-channel, and four-channel, respectively, ratio-optimized
constant-current regulators optimized for Tunable White and Tunable Color, Smart Lighting applications. The maximum current channel can drive
up to 500mA with a total driving current up to 1.0A, 1.5A, and 1.5A for AL1792, AL1793, and AL1794 respectively. The maximum current for
AL1791 is 1A (refer to Table 1 below). The minimum channel current is recommended as in Table 2 in order to meet channel current accuracy and
short protection specifications. Each channel can still be individually controlled by either digital PWM dimming down to 0.10%@1KHz,
0.4%@4KHz, or 1.0%@10KHz or analog dimming. The integrated low-side current sinks allow LED common-anode connections for cost
effectiveness or different anode voltages for efficiency optimization.
AL179x
AL1791
AL1792
AL1793
AL1794
Channel 1
1.0A
0.5A
0.5A
0.5A
Channel 2
X
0.5A
0.5A
0.5A
Channel 3
X
X
0.5A
0.375A
Channel 4
X
X
X
0.125A
Total IC Current
1.0A
1.0A
1.5A
1.5A
Table 1 Recommended Maximum Channel Current and Total IC Current for AL179x
AL179x
AL1791
AL1792
AL1793
AL1794
Channel 1
0.2A
0.1A
0.1A
0.1A
Channel 2
X
0.1A
0.1A
0.1A
Channel 3
X
X
0.1A
0.075A
Channel 4
X
X
X
0.025A
Total IC Current
0.2A
0.2A
0.3A
0.3A
Table 2 Recommended Minimum Channel Current and Total IC Current for AL179x
The device detects fault conditions and reports its status on FAULTB pin. It features LED open detection, LED short detection, Over-Temperature
Protection (OTP), and Undervoltage Lockout (UVLO). The AL179x provides supreme current matching between channels and devices. Along with
bus-mode fault reporting, multiple devices can be employed together to increase current driving capability or channel count versatility.
Enable and Soft-Start
The AL179x is enabled when the voltage at EN pin is greater than approximately 2.5V, and disabled when it is lower than 0.4V. When EN pin is
asserted high and VIN pin is ramped up beyond minimum operation voltage, a soft-start will be performed with a slew-rate-controlled current ramp
over 100μS at LEDx output pins to minimize current overshoot through LED strings for optimal system reliability.
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
3 of 18
www.diodes.com
September 2015
© Diodes Incorporated




Part Number AL1791
Description Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver
Maker Diodes
Total Page 18 Pages
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