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奇力VAS1106规格书

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标    签:高压线性恒流IC分段线性调光

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奇力调光芯片VAS1106是一款分段恒流、支持可控硅调光;调光吸顶灯、球泡、灯丝灯最佳方案选择;设计极简、无电解、高PF、过EMI;去电源化:LED与IC一起焊在铝基板上,去掉冗杂的电源;模块化:并联IC即可实现更大功率与光通量。高效率LED可控硅调光驱动方案VAS1106:

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Technology 奇力科技 VAS1106 Triac Dimmable Offline LED Driver General Description The VAS1106 is a constant current controller designed to be compatible with triac dimmers. A string of series/parallel LEDs is tapped at three locations, three integrated high voltage switches track the input sine wave voltage and turn on/off automatically. Voltage across each switch is minimized when conducting, providing high efficiency. The VAS1106 includes a bleeder circuit to ensure proper triac operation by allowing current flow while the line voltage is low to enable proper firing of the triac. An input voltage detecting circuit ensures high efficiency by shutting down bleeder current when voltage is high enough to hold the triac operating. VAS1106 is available in a SOP8-e package. Automatically adapt 1,2, 3 segments LEDs Up to 8W output 85% efficiency > 0.95 power factor Temperature Compensation Low conducted EMI without filters SOP8-e package Ordering Information Order Number Package Type Temp. Range VAS1106ID08E SOP8-e -40 °C to 105°C I: Industry, -40~85°C 08: Pin Number D: SOP E: ROHS Pin Configuration SOP8-e Application • LED Lighting Features Fit Triac Dimming No magnetics, no aluminum capacitors Automatically detect LED forward voltage Typical Application Circuit AC GND T1 SET1 T2 VAS1106 T3 SET2 SNS T4 VAS1106, ver1.2 1 http://www.chip-lead.com Technology 奇力科技 Block Diagram VAS1106 SNS 1.2V LED1 LED2 LED3 T1 T2 T3 T4 M1 M2 M3 Logic Control HV LDO 5V 1.2V Reference 0.65V SET1 PIN Description PIN NO. 1 2 3 4 5 6 7 8 EP GND SET2 Name GND SET2 SET1 Description Ground Current set for current regulator, connect a resistor to GND to set the LED current. ILED = VSET 2 RSET 2 , VSET2=650mV. If the IC temperature rise up to 120°C, the SET2 voltage will drop to reduce current. The SET2 voltage will drop to 350mV @160°C. Provide a bleeder current to ensure proper firing of the triac dimmer. IBleeder = VSET 1 RSET1 + RSET 2 , VSET1=500mV. SNS T4 T3 T2 T1 GND The input voltage sense pin Current regulator outputs. Connect to taps along the LED string Connect to Ground VAS1106, ver1.2 2 http://www.chip-lead.com Technology 奇力科技 VAS1106 Absolute Maximum Ratings (Note1) Parameters Maximum Ratings T1~T4 to GND SET1,SET2,SNS,VCC to GND Operating temperature range Junction temperature -0.3V to 500V -0.3V to 6V -40°C to +105°C -40°C to +150°C Storage temperature range -65°C to +150°C ESD human body model 2000V Note1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (Note2) Symbol Parameter Condition SPEC Min. Typ. Max. Unit VSUP Input voltage range 500 V ICC Quiescent current VT1=310V 300 µA VSET2 IACCU SET pin voltage Current accuracy VT1=310V 0.627 0.65 ±5 0.683 V % TSD RƟJA OTP threshold Thermal resistance SOP8-e 160 °C 60 °C/W Note 2: Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified over other temperature range, are guaranteed by design, characterization and process control. VAS1106, ver1.2 3 http://www.chip-lead.com Technology 奇力科技 Typical Performance Characteristics VAS1106 T4 LED current vs. T4 pin voltage LED current vs. Die temperature VAS1106, ver1.2 4 http://www.chip-lead.com Technology 奇力科技 VAS1106 Application Information 1. Operating Theory The AC main voltage waveform is a sine-wave, the rectifier bridge transfer the AC voltage to DC voltage, see (B) and (C). Figure (A) show typical triac dimmed voltage waveform. Vin (A) VRB (B) Vsin (C) Voltage Waveforms After Triac Dimming Without Bleeder Circuit Voltage Waveforms After Triac Dimming With Bleeder Circuit In order to emulate an incandescent light bulb with any LED driver, the existing triac will require a small amount of holding Vin current throughout R1 GND T1 the AC line cycle. An C1 R2 RSET1 NM1 SET1 T2 VAS1106 T3 SET2 external resistor (RSET1, RSET2) and internal M0 perform this SNS T4 function. However the external holding current R3 RSET2 may reduce the circuit efficiency, the external current should be shutdown when the line voltage is high enough. An external series pass regulator (R1, R2, R3) translates the rectified line voltage to a level where can be sensed by the SNS pin on the VAS1106. The SNS pin voltage compare with the threshold voltage of 1.2V to determine whether the external current should be shutdown or not. NM1 is used to delay enable LED driver for preventing LED flash when dimmer just turn on. Without triac dimmer the voltage after rectifier bridge is half-wave with 310V peak voltage for 220V AC (155V for 110V AC). The VAS1106 integrated 3 high voltage switches, named M1 to M3, each of their drain and source connect one LED string, named LED1 to LED3. Initially, all the switches are on. If the half-wave voltage is higher than the LED1+LED2 forward voltage, M1 turn off, thus the current VAS1106, ver1.2 5 http://www.chip-lead.com Technology 奇力科技 VAS1106 flow through LED1 and LED2. If the half-wave voltage is higher than the LED1+LED2+LED3 forward voltage, M2 turn off, thus the current flow through LED1, LED2 and LED3. For example, the LEDs are divided as 3 segments, each of them voltage is 150V, 60V and 60V. When the voltage rising to 150V+60V=210V, the LED1 and LED2 are fully turn-on, M1 turn-off. When the voltage rising to 150V+60V+60V=270V, the LED1, LED2 and LED3 are all fully turn-on, M2 turn off. 2. Set LED Current The VAS1106 feature a programmable LED current using a resistor RSET2. Use the following equation to calculate the sense resistor: I LED = 0.65V RSET 2 Change the value of RSET can obtain the required constant current. The chip power consumption is ILED *VD , VD is LED cathode voltage. In order to get the higher accuracy of the LED output current ,an 1% or more high precision resistor is commented. If the environment temperature changes a lot, such as change in ‐25°C to 85°C, use the low temperature coefficient resistance to ensure that the resistance value is almost constant. 3. Set Bleeding Current Resistors RSET1 and RSET2 are used to set bleeding current. I Bleeder = 0.5V RSET1 + RSET 2 4. Over-Heating Issue As the AC mains voltage rises, the LED cathode voltage will follow up, this will cause the chip overheating. The VAS1106 solve the issue by: 1) If the VAS1106 die temperature rise to 120°C (IC surface temperature is about 90°C), LED current started to decrease gradually, as the temperature reach 160°C, LED current dropped by half, this feature avoid the LED blinking. 2) If the temperature continues to increase to 160°C, VAS1106 enter thermal shutdown mode. When the temperature dropped to 120°C, VAS1106 re-start to work VAS1106, ver1.2 6 http://www.chip-lead.com Technology 奇力科技 Package Information (SOP8-e) VAS1106 VAS1106, ver1.2 7 http://www.chip-lead.com Technology 奇力科技 Classification Reflow Profiles Profile Feature Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) Average ramp-up rate (Tsmax to Tp) Liquidous temperature (TL) Time at liquidous (tL) Peak package body temperature (Tp)* Time (tp)** within 5°C of the specified classification temperature (Tc) Average ramp-down rate (Tp to Tsmax) Time 25°C to peak temperature VAS1106 Pb-Free Assembly 150°C 200°C 60-120 seconds 3°C/second max. 217°C 60-150 seconds Max 260°C Max 30 seconds 6°C/second max. 8 minutes max. VAS1106, ver1.2 Classification Profile 8 http://www.chip-lead.com Technology 奇力科技 CAUTION VAS1106 Storage Conditions 1) This product should be used within 12 months after delivered. Store in manufacturer’s package keeping the seal of aluminum coated baggage or tightly re-closed box with the following conditions. [Temperature:8°C...30°C,Humidity:30%...70% R.H.] 2) Keep the seal of aluminum coated baggage immediately before usage. 3) After breaking the seal of aluminum coated baggage, this product should be used within 1 week on the following conditions. [Temperature:≤30°C, Humidity: ≤60% R.H.] VAS1106, ver1.2 9 http://www.chip-lead.com

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