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PDF AL1792 Data sheet ( Hoja de datos )

Número de pieza AL1792
Descripción Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver
Fabricantes Diodes 
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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

1 page




AL1792 pdf
Detailed Description (cont.)
AL1791/1792/1793/1794
Analog Dimming Control
With the same PWMx pins, analog dimming can be facilitated to control the brightness of each LED channel. When no PWM signal with frequency
ranging from 500Hz and above during startup is present at PWMx pins, the device is determined in analog dimming mode. In this mode, the
signals at PWMx pins are interpreted as analog dimming signals. The meaningful dimming voltage should range from 0.4V to 1.5V. When the
voltage is 0.4V or below, the current-sink turns off the LED string. When the voltage is 1.5V or above, it turns the current level on to 100%. For any
voltage between 0.4V to 1.5V, the current level is linearly prorated to its full scale.
Undervoltage Lockout
The Undervoltage lockout function (UVLO) guarantees that the device is initially off during start-up. The UVLO functions only when the device is
enabled. Even if the AL179x is enabled, the device is not turned ON until the power supply has reached 6.3V. Whenever the input voltage falls
below approximately 6V, the device is turned off. The UVLO circuit has a hysteresis of 300mV. During UVLO, a FAULTB status will be reported.
Over-Temperature Protection
Thermal protection prevents the IC from damage when the die temperature exceeds safe margins. The AL1791/1792/1793/1794 features Over-
Temperature Protection (OTP). When the junction temperature reaches +160°C, the device will enter thermal shutdown mode in which all current
sinks are shut down and no current flows to the LED strings. The normal current level can be automatically restored to its set current from OTP by
triggering a Soft Start when the temperature lowers down below +100°C. Thermal Shut Mode will also be reported as a FAULTB.
LED Open and Short Protection
AL179x detects the LED status by continuously monitoring the current and voltage status of the LED strings. When an abnormal condition occurs
(LED Open or LED Short), FAULTB is asserted low. In the case of LED Short, all output channels will be turned off. In the case of LED Open, all
non-affected channels remain in the normal operating condition.
Fault Reporting
Fault reporting serves as a good communication channel between LED drivers and intelligent MCU unit. AL179x detects and reports the FAULTB
status upon the occurrence of Thermal Shutdown in OTP, LED Short, LED Open, and UVLO. FAULTB pin is an open-drain output design. Multiple
devices can share a single FAULTB signal by connecting all FAULTB pins together with an external pull-up resistor. Any FAULTB assertion from
any device pulls the signal down and informs MCU of the faulty condition.
LED Power Good Reporting
The Input Voltage to drive all attached Emitter Strings needs to maintain voltage level over required total VF of emitter string plus a minimum
voltage headroom (VLED_REG). On the other hand, excessive voltage headroom provided needs to be absorbed by AL179x, which increases
heat dissipation to complicate thermal management. Power Good reporting serves as a mechanism to detect the LED power supply condition and
adjusts the supply voltage to LEDs through MCU in order to minimize unnecessary overdrive voltage to the regulator and optimize the efficiency.
AL179x constantly detects and reports VLEDx (voltage measured at Pin LEDx) output headroom condition by asserting LEDPG pin. If the VLEDx in
any channel is lower than or close to the dropout voltage required by the regulator (VLED_REG) while the channel is enabled with PWMx and EN,
LEDPG pin will be pulled down to ground. During PWMx low period, internal LEDPG will not report insufficient headroom for that channel. Internal
LED Power Good logics are ANDed together before brought out to the pin. Any channel’s insufficient headroom condition will trigger a logic Low at
LEDPG pin. This signal can then be used by MCU to wisely adjust the LED power and thus the voltages to the LEDx pins to minimize power
consumption on AL179x. LEDPG needs to be connected with an external pull-up resistor. Multiple AL179x devices can also share a single pull-up
resistor to create a unified LEDPG signal.
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
5 of 18
www.diodes.com
September 2015
© Diodes Incorporated

5 Page





AL1792 arduino
Typical Performance Characteristics (cont.)
AL1791/1792/1793/1794
Figure 18 PWM Linearity (1KHz)
Figure 19 PWM Linearity (1KHz, sub-10%)
Figure 20 PWM Linearity (1KHz, sub-1%)
Figure 21 PWM Linearity (4KHz)
Figure 22 PWM Linearity (4KHz, sub-10%)
Figure 23 PWM Linearity (4KHz, sub-1%)
AL1791/1792/1793/1794
Document number:37957 Rev. 3 - 2
11 of 18
www.diodes.com
September 2015
© Diodes Incorporated

11 Page







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