Datenblatt-pdf.com


AL1794 Schematic ( PDF Datasheet ) - Diodes

Teilenummer AL1794
Beschreibung Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver
Hersteller Diodes
Logo Diodes Logo 




Gesamt 18 Seiten
AL1794 Datasheet, Funktion
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






AL1794 Datasheet, Funktion
AL1791/1792/1793/1794
Pin Descriptions
Pin
Name
EN
PWM4/GND
PWM3/GND
PWM2/GND
PWM1
LED1
LED2/GND
GND
LED3/GND
LED4/GND
LEDPG
FAULTB
REF
VIN
Exposed PAD
Part Number
U-DFN4030-14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Exposed PAD
Descriptions
Active-high to Enable, Internally Pulled Down
PWM Signal Input for channel 4, Internally Pulled Down for AL1794. GND for AL1791, AL1792,
and AL1793.
PWM Signal Input for channel 3, Internally Pulled Down for AL1793 and AL1794. GND for AL1791
and AL1792.
PWM Signal Input for channel 2, Internally Pulled Down for AL1792, AL1793, and AL1794. GND
for AL1791.
PWM Signal Input for channel 1, Internally Pulled Down (Tied to GND when this channel is NOT
used).
Channel 1 LED Cathode
Channel 2 LED Cathode for AL1792, AL1793, and AL1794. GND for AL1791.
Ground
Channel 3 LED Cathode for AL1793 and AL1794. GND for AL1791 and AL1792.
Channel 4 LED Cathode for AL1794. GND for AL1791, AL1792, and AL1793.
LED Power Good Indication. Asserted Low to report insufficient headroom. Needs an external pull-
up resistor.
Fault Report. Asserted Low to report faulty conditions. Needs an external pull-up resistor.
Reference Current Setting through External Resistor (RSET)
Voltage Input
Exposed pad. Internally connected to GND.
It should be externally connected to GND and thermal mass for enhanced thermal impedance.
It should not be used as electrical conduction path.
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
6 of 18
www.diodes.com
September 2015
© Diodes Incorporated

6 Page









AL1794 pdf, datenblatt
Typical Performance Characteristics (cont.)
AL1791/1792/1793/1794
Figure 24 PWM Linearity (10KHz)
Figure 25 PWM Linearity (10KHz, sub-10%)
Figure 26 PWM Linearity (10KHz, sub-2%)
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
12 of 18
www.diodes.com
September 2015
© Diodes Incorporated

12 Page





SeitenGesamt 18 Seiten
PDF Download[ AL1794 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AL1791Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED DriverDiodes
Diodes
AL1792Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED DriverDiodes
Diodes
AL1793Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED DriverDiodes
Diodes
AL1794Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED DriverDiodes
Diodes

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche