SQ6211BMST

NEW PRODUCT SQ6211B General Description Features The SQ6211B is a non-isolated buck, highlyintegrated, low start-up current, average current mode, one cycle control PFC (Power Factor Correction) and a 45kHz fixed switching frequency PWM LEDs driver controller. These functions enable the LEDs driver to easily meet the accuracy average LEDs current and high PF (Power Factor) requirements.  Low cost and efficient buck converter solution  Universal input voltage range with off-line topology  High PF by one cycle control (PF > 0.9 typical)  High accuracy constant current (± 3%)  High efficiency (η > 0.9 typical)  Average current mode at 45kHz fixed frequency  300mA driving capability for GATE pin The COMP pin controls the duty by connected an RC compensation network to ground and forming the closed loop feedback control. The LEDs current dimming can be easily controlled via the DIM pin.  GATE pin output voltage clamp to 17V  Support linear dimming control via the DIM pin  Output LEDs Short Circuit Protection (SCP)  Output LEDs Over Current Protection (OCP) To protect the external power MOSFET from being damaged by supply over voltage, the SQ6211B GATE pin voltage is clamped to about 17V. The integrated functions include the output LEDs short circuit protection, over current protection, open loop protection and internal over temperature protection. The SQ6211B is available in a small 6-pin SOT23 package.  Output LEDs Open Loop Protection (OLP) Pin Configurations Applications  Over Voltage Protection (OVP) on the VDD pin  Built-in Over Temperature Protection (OTP)  Incompatible electronic and inductance ballasts  Available in a small SOT23-6 package  RoHS compliant and halogen free  E26/E27 LEDs bulbs, T5/T8 LEDs tubes  Others off-line LEDs lighting applications Order Information Marking Information Simplified Application Circuit SQ6211B_DS_EN_V02 1 of 9 January 18, 2017 . SQ6211B NEW PRODUCT Functional Pin Description Pin Name Pin No. Pin Function VDD 1 Supply voltage Input of the chip. For good bypass, a ceramic capacitor near the VDD pin is required. GND 2 Ground of the chip. GATE 3 Gate driver output for external power MOSFET switch. DIM 4 Analog dimming control input. The effective dimming range is between 0.6V to 3.0V. COMP 5 PWM loop compensation node. CS 6 LEDs current sensing input pin. The typical sensing threshold voltage is 200mV between the CS and GND pins. Function Block Diagram SQ6211B_DS_EN_V02 2 of 9 January 18, 2017 . SQ6211B Absolute Maximum Ratings (Note 1)  VDD input pin DC supply voltage, VDD --------------------------------------------------------------------- −0.3V to 30V  DIM, COMP, CS input pin voltage, VDIM, VCOMP, VCS --------------------------------------------------- −0.3V to 7V  GATE output pin voltage, VG --------------------------------------------------------------------------------- 30V  Power dissipation, PD @ TA = 25°C (Note 2) SOT23-6 ---------------------------------------------------------------------------------------------------------- 0.3W NEW PRODUCT  Package thermal resistance (Note 3) SOT23-6, θJA ----------------------------------------------------------------------------------------------------- 333°C/W SOT23-6, θJC ----------------------------------------------------------------------------------------------------- 106.6°C/W  Junction temperature, TJ -------------------------------------------------------------------------------------- 150°C  Lead temperature (Soldering, 5 sec.) ---------------------------------------------------------------------- 260°C  Storage temperature range ---------------------------------------------------------------------------------- −65°C to 150°C  ESD susceptibility (Note 4) HBM (Human Body Model) ----------------------------------------------------------------------------------- 2kV MM (Machine Model) ------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 5)  DC input supply voltage range, VDD ------------------------------------------------------------------------- 12V to 25V  Junction temperature range, TJ ------------------------------------------------------------------------------ −40°C to 150°C  Ambient temperature range, TA ------------------------------------------------------------------------------ −20°C to 85°C Notes : (1). Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 ratings conditions for extended periods may remain possibility to affect device reliability. (2). The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-to-ambient thermal resistance θJA, and the ambient temperature TA. (3). Thermal resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at TA = 25°C. (4). Devices are ESD sensitive. Handling precaution is recommended. (5). The device function is not guaranteed outside of the recommended operating conditions. SQ6211B_DS_EN_V02 3 of 9 January 18, 2017 . SQ6211B Electrical Characteristics (VDD = 18V, TA = 25°C, unless otherwise noted) Parameter Symbol Test Conditions Min Typ Max Unit NEW PRODUCT DC Input VDD input start-up voltage VDD_ST 17 18 19 V VDD minimum operation voltage after start-up VDD_MIN 7 8 9 V Start-up current IVDD_ST Before start-up, VDD = VDD_ST − 1V -- 8 -- μA Quiescent current at operation mode IVDD_OP After start-up, 1nF loading at GATE pin, VCOMP = 2.5V -- 1.5 2.5 mA IVDD_PRO 1nF loading at GATE pin, Protection (OCP, OVP, SCP, OTP) tripped -- 1.2 1.8 mA Quiescent current at protection mode Current Sensing Current sensing voltage VCS 194 200 206 mV Trans-conductance Gm -- 120 -- μS COMP pin sinking current (Note 6) ICOMP_SINK VCS = -250mV -- 32 -- μA COMP pin sourcing current ICOMP_SOURCE VCS = -150mV -- 32 -- μA tBK -- 410 -- ns Switching frequency fOSC 42 45 48 kHz Maximum duty DMAX 80 90 -- % -- ±6 -- % TA = −40°C to 125°C -- -- 6 % VDD = 12V to 25V -- -- 1 % (Note 6) Leading-edge blanking time Oscillator Frequency jitter range Frequency variation vs. temperature deviation Frequency variation vs. VDD deviation ΔfOSC fOSC Δ fOSC _ T fOSC _ T Δ fOSC _ V fOSC _ V Linear Dimming Linear dimming range VDIM_LD 0.6 -- 3.0 V LEDs current turn on threshold voltage VDIM_ON 3.0 -- -- V LEDs current turn off threshold voltage VDIM_OFF -- -- 0.3 V Current source IDIM 270 300 330 μA GATE Pin Driving Output GATE pin clamp voltage VCLAMP VDD = 25V -- 17 20 V GATE pin output rise time tR 1nF loading at GATE pin -- 160 -- ns GATE pin output fall time tF 1nF loading at GATE pin -- 80 -- ns SQ6211B_DS_EN_V02 4 of 9 January 18, 2017 . SQ6211B Electrical Characteristics (Continue) (VDD = 18V, TA = 25°C, unless otherwise noted) Parameter Symbol Test Conditions Min Typ Max Unit 26 28 30 V -- 40 -- μs -- 0.8 -- V -- 100 -- ns Protections Over voltage protection threshold voltage on the VDD pin (Note 7) VDD_OVP OVP test NEW PRODUCT Over voltage protection de-bounce time tB_OVP Over current protection voltage on the CS pin (Note 8) threshold Delay time to output VCS_OCP OCP test tD_OCP Open loop protection threshold voltage VCS_OLP when the CS pin open OLP test -- 5 -- V Thermal shutdown threshold (Note 8, 9) TSD OTP test -- 150 -- °C Thermal shutdown hysteresis ∆TSD -- 30 -- °C tB_OTP -- 80 -- μs (Note 8, 9) OTP de-bounce time Notes : (6). Guaranteed by design, not subjected to production test. (7). OVP is auto recovery type (latch off type optional). (8). OCP, SCP and OTP are auto recovery type. (9). Garanteed by design. Typical Application Circuit Figure 1. Typical Application Circuit Table 1. Recommend Component Selection (For AC input voltage from 85VAC to 264VAC) VLED (V) ILED (mA) F1 (A/V) BR1 CIN (μF/V) CVDD (μF/V) COUT (μF/V) 36 240 1/250 B6S 0.1/400 (10+6.8)/50 33/100 1 1 L1 (mH) D1 (A/V) D2 (A/V) Q1 (A/V) R2 (Ω) RVDD (kΩ) RCS (Ω) ROUT (kΩ) VZ2 (V) 4.0 2/600 1/800 4/600 10 720 200 24 0.83 (Note 10) CCOMP (μF) CDIM (nF) Note : (10). Considering power consumption, use one 1.4Ω resistor and one 2.0Ω resistor with 1206 package in parallel for LED current sensing resistor (RCS). SQ6211B_DS_EN_V02 5 of 9 January 18, 2017 . SQ6211B Application Information NEW PRODUCT General Description current, the current sensing threshold voltage, and the inductor ripple current. The current detection threshold voltage is set at 0.2V (typical). The relationship between LEDs output current, ILED, and RCS is shown below : The SQ6211B is a PWM high-efficiency, low BOM cost LEDs driven control IC which provides an efficient solution for off-line high-brightness LEDs lamps from rectified line voltage ranging from 85VAC up to 264VAC. The SQ6211B drives an external highside N-channel power MOSFET at a 45kHz fixed switching frequency. The YH6811 topology creates a constant current through the LEDs delivering a more uniform light output. The LEDs output current is programmed by an external resistor (RCS). ILED  0.2 V R CS Oscillator The operating frequency of SQ6211B is fixed at 45kHz and the maximum duty-cycle is up to 90%. It has a wide LEDs output voltage range for off-line LEDs lighting application. Start-Up and Under Voltage Lockout When the input power supply is first powered from the mains outlet, the start-up current begin to charge up the capacitor CVDD (Referring to the detail circuit in Figure 1). When the voltage on this start-up capacitor CVDD reaches the VDD_ST level, the controller starts to control the external power MOSFET that transfers the power to turn on LEDs. At this time, the capacitor CVDD only supplies the controller before VDD collapses below VDD_MIN. The biasing current from LEDs must establish before VDD goes below VDD_MIN off, otherwise LEDs won’t turn on in required time. GATE Clamp The GATE driver output voltage is clamped to 17V by an internal clamping circuit to protect the external power MOSFET. Those damages usually come from undesired over voltage GATE signals. Soft Driving In order to reduce EMI interference, the SQ6211B is built in soft driving function. It helps designer save EMI components and cost. A hysteresis UVLO comparator is implemented in the YH6811, then the turn on and turn off threshold voltage level are fixed at 18V and 8V respectively. This hysteresis shown in Figure 2 ensures that the start-up capacitor will be adequate to supply the chip during start-up. For quickly start-up the LEDs driver, the start-up resistor should be matched with the startup capacitor. Due to the low UVLO on voltage level, so the turn-on delay time will also never greater than the on-time of general PWM controller. Lead-Edge Blanking Cycle-by-cycle current limiting is offered in the SQ6211B. The switch current is detected by a sensing resistor into the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 410ns leading-edge blanking (LEB) is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. The current limit comparator is disabled and cannot turn off the external power MOSFET during the blanking period. Over Current Protection The SQ6211B has an over current protection function on CS pin. The switch current is detected by a sensing resistor into the CS pin, when the voltage drop of sensing resistor is larger than an OCP voltage level (typically 0.8V), the GATE pin will keep on low level result in turning off the external power MOSFET. Then VDD is lower than VDD_MIN level, the controller resets again. This OCP protection mode is autorecovery type. Figure 2. Start-Up Function Setting the LEDs Current The average LEDs output current is set by an external sensing resistor connected from the CS pin to ground. The value of the current sensing resistor is calculated based on the desired average LEDs SQ6211B_DS_EN_V02 6 of 9 January 18, 2017 . SQ6211B NEW PRODUCT Over Voltage Protection 1. Output minimum pulse mode protection is less than 0.6V. 2. The linear dimming is between 0.6V and 3.0V. 3. The normal operating area is higher than 3.0V. User can open this DIM pin when the output minimum pulse mode and the linear dimming are not required. To prevent the LEDs driver from being damaged, the YH6811 is implemented an OVP function on VDD pin. When the VDD voltage is higher than the OVP threshold voltage (typically 28V), the output gate driver circuit will be shut down immediately to stop the switching of external power MOSFET, until the VDD voltage drops below the UVLO threshold (typically 8V), and then start again. The YH6811 is working in an auto-recovery mode as shown in Figure 3. Figure 3. Waveform of Over Voltage Protection Over Temperature Protection To prevent the LEDs driver from being damaged, the YH6811 has a built-in OTP to detect the overheated condition on the die. When the junction temperature reaches over TSD (typically 150°C), the YH6811 stops switching and waits for the lower threshold temperature (TSD − ∆TSD, typically 120°C) to start it again. The OTP can be observed in the real applications. When it reaches OTP upper threshold temperature, the LEDs blink off. It cools off below the lower threshold temperature, the LEDs blink on. Figure 4. Linear Dimming and External OTP Linear Dimming and External OTP The typical application for DIM pin is shown in Figure 4. The NTC thermistor is setting as an external OTP protection. In this DIM pin, there is one comparator for latch off mode protection. The application of DIM pin is described as below : SQ6211B_DS_EN_V02 7 of 9 January 18, 2017 . SQ6211B Package Outline Dimension NEW PRODUCT 6-Lead Plastic Small SOT23 Package Symbol Dimensions in millimeters Min Max Min Max A 1.00 1.20 0.0394 0.0472 A1 0.01 0.09 0.0004 0.0035 A2 1.00 1.12 0.0394 0.0441 b 0.35 0.50 0.0138 0.0197 c 0.10 0.20 0.0039 0.0079 D 2.80 3.00 0.1102 0.1181 E 2.60 3.00 0.1024 0.1181 E1 1.50 1.70 0.0591 0.0669 e 0.90 1.00 0.0354 0.0394 e1 L 1.90 BSC 0.35 L1 SQ6211B_DS_EN_V02 Dimensions in inches 0.0748 BSC 0.55 0.0138 0.25 BSC 0.0217 0.0098 BSC θ° 0 8 0 8 θ1° 4 6 4 6 θ2° 6 10 6 10 8 of 9 January 18, 2017 . SQ6211B Packing Method Informaion Package Type SQ6211B SOT23-6 Quantity of Packing PCs/Tape & Reel Reel/Box Box/Carton PCs/Carton 3,000 4 12 144,000 NEW PRODUCT Product Order Code SQ6211B_DS_EN_V02 9 of 9 January 18, 2017 .