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AL1793 Datasheet(PDF) 3 Page - Diodes Incorporated |
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AL1793 Datasheet(HTML) 3 Page - Diodes Incorporated |
3 / 18 page AL1791/1792/1793/1794 Document number:37957 Rev. 3 - 2 3 of 18 www.diodes.com September 2015 © Diodes Incorporated AL1791/1792/1793/1794 Typical Applications Circuit (continued) EN PWM1 PWM2 PWM3 FAULTB REF GND LED1 LED2 LED3 3.3V RFAULT RSET1 VIN VLED1 Wireless/Color management MCU AP3983C AC-DC Conversion 85~265Vac AL1793 LEDPG RLEDPG VIN adjustment signal VLED2 G R B EN PWM1 FAULTB REF GND LED1 VIN AL1791 LEDPG 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 Channel 1 Channel 2 Channel 3 Channel 4 Total IC Current AL1791 1.0A X X X 1.0A AL1792 0.5A 0.5A X X 1.0A AL1793 0.5A 0.5A 0.5A X 1.5A AL1794 0.5A 0.5A 0.375A 0.125A 1.5A Table 1 Recommended Maximum Channel Current and Total IC Current for AL179x AL179x Channel 1 Channel 2 Channel 3 Channel 4 Total IC Current AL1791 0.2A X X X 0.2A AL1792 0.1A 0.1A X X 0.2A AL1793 0.1A 0.1A 0.1A X 0.3A AL1794 0.1A 0.1A 0.075A 0.025A 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. |
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