RT6010 RICHTEK | Alldatasheet
Document overview
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Technical content
Features
zzzzz Fast Average Current Control T2C (T1/T2 Average Current Control) zzzzz Dual MOSFET Drives for Asynchronous Buck Topology zzzzz Provide High Efficiency > 95% and High Accuracy ±±±±±3% Channel to Channel Variation zzzzz Provide LED w/o Binning zzzzz Programmable PWM Constant Off Time zzzzz Support both PWM and Analog Dimming zzzzz PWM Dimming Duty Down to 1% zzzzz OVP for Bar Short with VIN zzzzz UVP for Bar Open/Short to GND with programmable Fault Delay zzzzz Support SPD (Smart Phase Shift Dimming) for Multiple Channel Dimming Solution zzzzz VIN POR Detection with EN Pin to Prevent Malfunction zzzzz SOP-16 Package zzzzz RoHS Compliant and Halogen Free
Applications
z LCD TV, MNT Display Backlight z DC/DC or ACDC LED Driver Application z General Purpose Constant Current Source z LED Signage and Display z Architectural and Decorative LED Lighting z LED Street Lighting Pin Configurations (TOP VIEW) SOP-16 VSS PWM_OUT EN RT_OUT CS2 GATE2 GATE1 VCC DIM/PWM_IN RT D_OSC F_DELAY FAULT NC CS1DPS Package Type S :SOP-16 RT6010 Lead Plating System G : Green (Halogen Free and Pb Free)
©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. 1 VCC Power Supply for PWM Controller. 2 DIM/PWM_IN Dimming PWM Pulse Input or Analog Voltage Input. 3 RT Constant off time setting by connecting proper resistor to VSS.
4 D_OSC
5 F_DELAY Define FAULT pin output delay by connecting to a proper capacitor to prevent false
6 FA ULT Open drain output fault including UVP , OVP , and OTP (Active Low). 7 NC No Internal Connection. 8 DPS Smart Phase Shift Dimming Disable Pin. Pull DPS high to disable function. 9 CS1 Channel 1 Current Sense Input. 10 GATE1 Channel 1 Current Gate Driver Output. 1 1 GATE2 Channel 2 Current Gate Driver Output. 12 CS2 Channel 2 Current Sense Input. voltage divider to guarantee VIN power ready to prevent from PWM malfunction. 14 RT_OUT Output for the next RT6010 RT.
15 PWM_OUT SPD (Smart Phase Shift Dimming) output for slave to synchronize dimming phase
Figure 3. Synchronization for Multiple Channel_Analog
DS6010-00 March 2012www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Function Block Diagram GATE1 GATE2 Average Control Logic Average Control Logic Dimming Control Protection OTP Bar open Bar short to VIN Bar short to GND OSC CS1, CS2 PWM_OUT RT_OUT VCC VSS Off_time control10µA 2V Enable EN_PWM1 EN_PWM2 CS1 EN CS2 DIM/PWM_IN D_OSC DPS RT F_DELAY FAULT
DS6010-00 March 2012 www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation.
Electrical Characteristics
(TA = 25 °C, unless otherwise specified) Recommended Operating Conditions (Note 4) Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) z ESD Susceptibility (Note 3) Parameter Symbol T est Conditions Min Typ Max Unit Supply Input Supply Current I VCC VBOOT = 12V, VDIM/PWM_IN = 5V , VCSx = 0.3V -- 4 -- mA Shutdown Current I SHDN Without HV LDO Æ lower shut down current 1mA -- -- 1 mA UVLO Threshold V UVLO 7 8 9 V UVLO Hysteresis ΔVUVLO -- 1 -- V Logic-High V IH 2 -- -- DIM/PWN_IN Threshold Voltage Logic-Low V IL -- -- 0.6 V Logic-High V OH 2.4 -- -- PWM_OUT Threshold Voltage Logic-Low V OL -- -- 0.4 V EN Threshold -- 2 -- V EN Hysteresis -- 0.2 -- V PWM Controller CS VREF -- 500 -- mV On-Time t ON Recommend 2 8 20 μs Constant Off-Time t OFF Set up by RT(set 66.6k Ω) 0.8 1 1.2 μs Duty Recommend customer application duty 40 85 90 %
DS6010-00 March 2012www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Note 1. Stresses beyond those listed “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 conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. θ JA is measured at T A = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit PWM Frequency Defined by t OFF 50 100 300 kHz Channel-to-Channel Accuracy -- 1.6 -- % Protection OVP LED string short -- 1 -- V UVP LED string no connection -- 100 -- mV F_DELAY Detect Voltage Bar open, Bar short to GND, Bar short to VIN & OTP 0.9 1 1.1 V F_DELAY Current Source -- 10 -- μA FAULT Open Drain Ability -- -- 100 Ω UVP/OVP Blanking Time -- 500 -- ns UVP Delay Time To gate off -- 250 -- ns OTP -- 160 -- °C OTP Hysteresis -- 20 -- °C Dimming PWM Dimming Frequency 100 -- 600 Hz Min Dimming Pulse 5 -- -- μs Forced Dimming Delay Time (High) Force dimming to H when DIM/PWM_IN goes H for too long -- 25 -- ms High-Level V IH When operating at analog dimming, we recommend DIM below 2.4V -- 2.5 -- D_OSC Input Low-Level V IL When operating at analog dimming, we recommend DIM above 1.1V -- 1 -- V D_OSC Sourcing Current -- 10 -- μA D_OSC Sinking Current -- 10 -- μA Driver Capability Gate Driver Source V CC = 12V , VGATEX = 9V -- 80 -- mA Gate Driver Sink V CC = 12V , VGATEX = 3V -- 200 -- mA
DS6010-00 March 2012 www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. Typical Operating Characteristics LED Current vs. Analog Dimming Voltage 100 120 Analog Dimming Voltage (V) LED Current (mA) ILED1 VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs ILED2 Efficiency vs. Input Voltage 100 110 120 130 140 150 160 170 180 190 200 Input Voltage (V) Efficiency (%) VOUT1 = VOUT2 = 90V, 56LEDs, ILED1 = ILED2 = 100mA, RRT = 180kΩ LED Current vs. Output Voltage 100 102 104 106 108 110 60 65 70 75 80 85 90 95 100 Output Voltage (V) LED Current (mA) ILED1 ILED2 VIN = 120V, ILED1 = ILED2 = 100mA, RRT = 180kΩ LED Current vs. Input Voltage 100 102 104 106 108 110 110 120 130 140 150 160 170 180 190 200 Input Voltage (V) LED Current (mA) ILED1 VOUT1 = VOUT2 = 90V, 56LEDs, ILED1 = ILED2 = 100mA, RRT = 180kΩ ILED2 LED Current vs. Temperature 102 106 110 -50 -25 0 25 50 75 100 125 Temperature (°C) LED Current (mA) ILED1 VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs, ILED1 = ILED2 = 100mA, RRT = 180kΩ ILED2 LED Current vs. PWM Duty Cycle 100 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Duty Cycle (%) LED Current (mA) ILED1 VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs, RRT = 180kΩ, COUT = 0.22μF ILED2
DS6010-00 March 2012www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. PWM Dimming Response Time (50 μs/Div) ILED1 (100mA/Div) PWM (5V/Div) ILED2 (100mA/Div) COUT = 0.22μF, ILED1 = ILED2 = 100mA VIN = 120V, VOUT1 = 100V, 31LEDs VOUT2 = 80V, 25LEDs, PWM = 300Hz Time (1ms/Div) Non-SPD Function ILED1 (100mA/Div) IIN (100mA/Div) VIN_AC (500mV/Div) ILED2 (100mA/Div) PWM = 300Hz, PWM Duty = 30% VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs SPD Function Time (1ms/Div) ILED1 (100mA/Div) IIN (100mA/Div) VIN_AC (500mV/Div) ILED2 (100mA/Div) PWM = 300Hz, PWM Duty = 30% VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs PWM Dimming Response Time (50 μs/Div) VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs, PWM = 300Hz, COUT = 0.22μF, ILED1 = ILED2 = 100mA ILED1 (100mA/Div) PWM (5V/Div) ILED2 (100mA/Div) LED Current vs. PWM Duty Cycle 100 0 2 04 06 08 0 1 0 0 Duty Cycle (%) LED Current (mA) ILED1 ILED2 VIN = 120V, VOUT1 = 100V 31LEDs, VOUT2 = 80V, 25LEDs PWM = 300Hz, COUT = 0.22μF
DS6010-00 March 2012 www.richtek.com ©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation.
Application Information
The RT6010 is a dual channel, high accuracy current control LED backlight buck controller. The controller is capable of providing efficiency higher than 95% for LED backlight use. Current Setting Current flow through the inductor during charging period is detected by a sensing resistor, R CS. The RT6010 provides average current mode by dynamically adjusting V REF. The LED average current can be set as : OUT CS 500mVI = R Constant Off-Time Setting The RT6010 is a constant off-time control IC. The off-time can be set via the external RT pin resistance, R RT. The switching frequency is usually designed to be between 50kHz to 300kHz, so the constant off-time must also meet the following condition : IN LED OFF IN OFF RT V - V50k 300kt x V t = 15p x R where tOFF is the constant off-time Smart Phase Shift Dimming The RT6010 provides dimming function selection via the DPS pin. If the pin is connected to VCC, the two dimming signals will be in sync for those two channels. On the other hand, if the pin is connected to GND, the two dimming signals will be separated. See Figure below. Figure 4 . Smart Phase Shift Dimming Via the DPS Pin DPS = VCC DIM/PWM_IN GATE1 GATE2 DPS = GND DIM/PWM_IN GATE1 GATE2 Analog Dimming Frequency Setting The RT6010 not only provides digital dimming, but also analog dimming as well. The analog dimming frequency is set via the D_OSC pin. Note that the minimum dimming duty is 6.667%. The dimming frequency is set according to the following equation : PWM D_OSCf = 1 0 μA / (C 3V) × where CD_OSC is the capacitor connected from the D_OSC pin to GND. Protection Functions The RT6010 provides various protection features to prevent damage to the IC during abnormal situations. The features include over voltage protection, under voltage protection, and over temperature protection. The protection flow chart is shown below. FLT Blanking Delay An FLT blanking delay function is available for setting the fault delay time to prevent false triggers for UVP and OTP. The delay time is set via the external capacitor connected from the F_DELAY pin to ground. The blanking delay time can be set according to below equation : F_DELAY 1Vt = C x 10μA where C F_DELAY is the capacitor connected from the F_DELAY pin to GND. After VF_DELAY > 1V, a fault signal will be sent to the FAULT pin. Over Voltage Protection The RT6010 provides Over Voltage Protection (OVP) when the LED cathode becomes shorted to VIN. The OVP threshold voltage of the CSx pin is approximately 1V. If OVP is triggered during gate-on period, the controller will turn off the MOSFET for 400 μs. If OVP occurs consecutively for more than 14 times, the RT6010 will send a fault signal to the FAULT Under Voltage Protection For situations where the LED cathode becomes open or shorted to GND, the RT6010 provides Under Voltage Protection (UVP). The threshold voltage of UVP is approximately 0.1V. If UVP occurs during gate-on period, the RT6010 will send a fault signal to the FAULT pin after the fault delay time.
©Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Ric htek Technology Corporation. PWM off-time, and IOUT is the LED average current. Figure 5. Protection Flow Chart for the RT6010 DS, rating and low gate charge. respond slowly. The typical value of the capacitor is 0.22μF.
DS6010-00 March 2012 www.richtek.com Richtek Technology Corporation 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnish ed by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of R ichtek or its subsidiaries. Outline Dimension F B C I H D A J M Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 9.804 10.008 0.386 0.394 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.178 0.254 0.007 0.010 I 0.102 0.254 0.004 0.010 J 5.791 6.198 0.228 0.244 M 0.406 1.270 0.016 0.050 16–Lead SOP Plastic Package