HT7L2102 Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Green Mode and Integrated Protections Feature General Description • Frequency Jitter for EMI Restriction • Over-Voltage-Protection(OVP) on VCC Pin The HT7L2102 is an advanced, highly integrated LED Lighting driver using an AC-DC isolation topology. The device provides many protection functions and uses ultra low power circuit design, and is optimized to restrict EMI. By integrating a Non-Audible Noise Green Mode Control Structure, users can implement a single circuit for different LED load levels for various series/parallel configurations but still maintain high efficiency for different load conditions. This device also integrates various protection functions for LED Lighting requirements such as Cycle-by-Cycle Current Limiting, Short-Circuit Protection (SCP), Over-Voltage Protection (OVP), Over-Temperature Protection (OTP) for external thermistor sensing, and a Soft-Start function to reduce inrush currents during LED power system initialization for the prevention of device burn-out. • Over-Temperature-Protection(OTP) on TS pin for External Thermistor Sensing The HT7L2102 provides a 1~99% PWM Dimming Range with duty-cycle scale precision lower than 1%. • Integrated Soft-Start Function • Very Low Operating Current and Start-up Current (<20mA) for satisfying Energy-Star 2.0 "No-Load Mode" (Stand-by) Power standard • ±5% Trimmed Oscillator for Precise Frequency • Non-Audible-Noise Green Mode Control to maintain efficiency for both Light and Heavy Loads • LEB (Leading-Edge Blanking) on CS Pin • Internal Slope Compensation • Cycle-by-Cycle Current Limiting • Short-Circuit-Protection(SCP) for Short-Circuit and Over-Load Condition • 1~99% PWM Dimming Range • 8-pin SOP package Applications • Isolation AC-DC LED Lighting • AC-DC Switching Power Supply/Adapter Application Circuits L Vac=85V~265V T1 BD1 R7 C2 N D1 Vout 7 1 R3 C4 C14 R4 8 D4 U1 C15 Vref 3 D3 VCC 4 C12 5 Q1 GD RT R20 R19 R11 ISENSE TS Rts COMP/FB GND R28 U2 C19 Q3 Rev. 1.00 1 November 4, 2011 HT7L2102 Block Diagram Pin Assignment VREF 8 VCC 7 UVLO OVP 32V RT Internal Bias & Vref VCC Driver Stage Green Mode OSC 4 107uA TS 2 FB/PDM 1 ISENSE 3 Temperature Sense 6 GD 5 GND S Q R Soft-Start 14V / 8V Frequency Jitter Slope Compensation Constant Current Controller LEB 350ns FB Compare Level = 2.5V OTP SCP OCP OCP Level = 1V Pin Description Pin No. Pin Name Description 1 FB/PDM Voltage Feedback Pin. Connected to a Photo-Coupler for closed-loop control. This pin also can be used as a PWM Dimming Pin. 2 TS Temperature Sense Pin. Connected to an external thermistor as a sense system hot point. This pin also can be used for an external System-Latch. 3 ISENSE A voltage proportional to the inductor current is connected to this input. The Constant Current Controller uses this voltage information to keep the system output current within a narrow range. 4 RT The oscillator frequency is programmed by connecting a resistor RT between this pin and ground. A maximum frequency of 500KHz is possible. 5 GND 6 GD 7 VCC Positive Supply. 8 VREF A Temperature-Independent Voltage Reference output. Combined control circuitry and power ground. Power MOSFET gate driver output. Absolute Maximum Ratings Supply Voltage VCC�������������������������������������������������������������������������������������������������������������������������������� -0.3V~30.0V FB/PDM, RT, ISENSE, TS Pins���������������������������������������������������������������������������������������������������������������� -0.3V~5.5V Junction Temperature������������������������������������������������������������������������������������������������������������������������������������������ 150°C Operating Ambient Temperature��������������������������������������������������������������������������������������������������������������� -40°C~85°C Storage Temperature Range�������������������������������������������������������������������������������������������������������������������� -65°C~150°C Package Thermal Resistance (8-Pin SOP)����������������������������������������������������������������������������������������������������� 160°C/W ESD Protection: Human Body Model��������������������������������������������������������������������������������������������������������������������������������������3kV Machine Model�������������������������������������������������������������������������������������������������������������������������������������������200V Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings” may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. Rev. 1.00 2 November 4, 2011 HT7L2102 Electrical Characteristics Unless otherwise stated, this specifications apply for 0°C ≤ Ta ≤ 70°C, VCC=15V, RT=10kW Symbol Parameter Test Condition Min. Typ. Max. Unit Supply Voltage (VCC Pin) IST Startup Current ICC Operating Current VTL UVLO (Off) VTH UVLO (On) VCC OVP Trip Level VD-OVP OVP Strobe Time VCC=12.9V — 12 30 mA VFB/PDM=0V — 2.0 3.0 mA — 2.5 — mA 7 8 9 V V VFB/PDM=3V — — VCC(Over Voltage Protection) — 13 14 15 26.5 28.0 29.5 V — 100 — ms Reference Section (VREF Pin) VREF Output Voltage Tj=25°C, IO=1mA — 5.5 — V ∆VREF Line Regulation 12V ≤ VCC ≤ 25V — 3 20 mV ∆VREF Load Regulation 1mA ≤ IO ≤ 10mA — 4 25 mV Current Sensing (ISE NSE Pin) VIS(OFF) Maximum Input Voltage, Vcs(off) — 0.9 1.0 1.1 V tLEB Leading Edge Blanking Time — — 350 — ns Delay to Output — — 100 — ns Oscillator (RT pin) fOSC ∆fOSC ∆TA ∆fOSC ∆VREF DMAX Oscillator Frequency Tj=25°C, RT=10kW to GND 49 52 55 kHz Temperature Stability -40°C ~105°C — 5 — % Voltage Stability VCC=10V~25V — 0.2 1.0 %/V Maximum Duty — — 75 — % Frequency Jitter — — ±4 — % — — 1 V Gate Drive Output (GD Pin) VOL Output Low Level VCC=15V, Isink=20mA VOH Output High Level VCC=15V, Isource=20mA 9 — — V tr Rising Time Tj=25°C, Load Capacitance=1nF — 50 150 ns tf Falling Time Tj=25°C, Load Capacitance=1nF — 50 150 ns Voltage Feedback (FB/PDM Pin) ISINK Short Circuit Current VFB/PDM=0V — 1.5 2.2 mA VFB/PDM Open Loop Voltage FB/PDM pin open — 5.5 — V SCP Trip Level VFB/PDM (SCP) — 4.7 — V SCP Delay Time (See Note) fS=52kHz — 75 — ms Soft-Start Time RT=10kW — 10 — ms V SCP (Short Circuit Protection) VFB/PDM Soft-Start tSTART External OTP(Over Temperature Protection, TS Pin) VOTP-On OTP Enable Trigger Level 0.95 1.00 1.05 VOTP-Reset OTP Disable Trigger Level — 1.2 — V ITS Pull up Current Source 96 107 118 mA Note: These Parameters, although guaranteed, are not 100% tested in production. Rev. 1.00 3 November 4, 2011 HT7L2102 Typical Performance Characteristics 15.5 10 9.5 UVLO (off)(V) UVLO (on)(V) 15 14.5 14 13.5 13 12.5 8 7.5 7 12 11.5 9 8.5 6.5 -40 -20 0 20 40 60 80 100 6 120 -40 10 60 Figure 1. UVLO (on) (V) vs. Temperature Figure 2. UVLO (off) (V) vs. Temperature 57 56 55 54 53 52 51 50 49 48 47 -40 57 56 55 54 53 52 51 50 49 48 47 11 -20 0 20 40 60 80 100 120 13 15 17 Temperature (degree C) -20 0 20 40 60 80 100 23 25 31 29 27 25 23 21 19 17 15 11 120 Temperature (degree C) 13 15 17 19 21 23 25 Vcc (V) Figure 6. Green Mode Frequency vs. VCC Figure 5. VFB/PDM for SCP vs. Temperature Rev. 1.00 21 Figure 4. Frequency vs. VCC Green Mode Frequency (KHz) 4.9 4.85 4.8 4.75 4.7 4.65 4.6 4.55 4.5 4.45 4.4 -40 19 Vcc (V) Figure 3. Frequency vs. Temperature Vcomp (V) 110 Temperature (degree C) Frequency (KHz) Frequency (KHz) Temperature (degree C) 4 November 4, 2011 HT7L2102 Application Information Operation Overview The HT7L2012 is a highly functionally integrated PWM controller for LED lighting and is optimized to restrict EMI. The device offer a dimming precision of less than 1% and has a dimming range of 1% to 99%. Its integrated features include Green mode (NonAcoustic-Noise), internal slope compensation, high efficiency under different load conditions within a wide operating temperature range of -40°C to 85°C. The devices also includes a range of protection functions, SCP, OVP, UVLO, current limit, LEB, soft start, OTP for external thermistor sensing. These features not only enhance system performance, but also ensure high stability of the whole circuit application even under extreme environmental conditions such as high temperature or high EMI levels. Advanced Precision Oscillator for Green-Mode Switching and Non-Acoustic Noise Requirement A Trimmed Precision Green Mode Oscillator is implemented in the device to enhance the conversion efficiency under light load conditions. As Fig. 7 shows, the efficiency difference between light loads and heavy loads is less than 1%, while the average efficiency is only 89.5%, the peak efficiency is 90%. Figure 8. Oscillator Behavior Compared with HT7L2102 and Other Green Mode PWM Controller Frequency Jitter for EMI Restriction EMI restriction is accomplished using a Frequency Jitter function, which spreads the energy over a wider frequency range than the bandwidth measured by the EMI test equipment. An internal Frequency Jitter circuit changes the switching frequency between +4% and -4% of the central frequency with a period of 4ms. Figure 7 HT7L2102 Efficiency Performance between Light-Load and Heavy-Load The Green Mode Oscillator types supplied by other PWM Controller providers are plagued by AcousticNoise problems. This is because, under light load conditions, the frequency will keep decreasing through the Human Acoustic Range (from 20Hz to 20kHz), and these audio frequencies may create audible noise in the transformer. Holtek’s HT7L2102 patented Green Mode Oscillator designed using an advanced Non-Acoustic Noise structure prevents the generation of frequencies in the audio frequency band, thus eliminating any transformer noise. Rev. 1.00 Figure 9 Frequency Jitter Function Spreads Energy Over a Period to Accomplish EMI Restraining 5 November 4, 2011 HT7L2102 Under Voltage Lockout (UVLO) Internal Slope-Compensation An UVLO comparator is implemented in to ensure that the device is fully functional before the output stage is enabled. As shown in Fig. 10, hysteresis is provided to prevent the PWM Controller from shutting down during any voltage dips which might occur during startup. The turn-on and turnoff threshold levels are set at 16.0V and 10.0V, respectively. An important issue with current mode control structures is instability due to Sub-Harmonic Oscillation when the Duty-Cycle > 50%. To prevent this problem from occurring, a Slope-Compensation function is always necessary. In traditional currentmode PWM Controller application, many external components are necessary to implement a Slope-Compensation function. However in the HT7L2102, the internal Slope-Compensation eliminates the need for these external components resulting in a simplified the application circuit design. Short-Circuit Protection (SCP) and Over-Load Protection (OLP) To protect all the devices in a system from being damaged due to over load or short circuit conditions, a smart SCP function is implemented in the device. Here the feedback system will force the voltage loop to move toward a saturation value and then pull up the voltage on the COMP pin. Whenever the VCOMP increases to the SCP threshold of 4.7V and remains there for longer than 40mS, the protection scheme will activate and then turn off the gate output to stop the power circuit switching. By using such a protection mechanism, the average input power can be reduced to a very low level so that component temperature and stress can be controlled within safe operating levels. Figure 10. UVLO Scheme and Start-Up Current Current Sense and Leading-Edge Blanking (LEB) A Leading-Edge Blanking Scheme is integrated in the device to prevent false triggering due to feedback current spikes which may appear on the CS pin, further eliminating the need for an R-C filter which is always a requirement in traditional current mode PWM Controller applications. Figure 12. SCP Function Behavior Figure 11. LEB with R-C Filter Removed Rev. 1.00 6 November 4, 2011 HT7L2102 VCC Pin Over-Voltage Protection (OVP) Oscillator Frequency Tuning VCC Over-Voltage Protection is integrated in the device to prevent component damage due to over voltage conditions on the VCC pin. The OVP is triggered when VCC reaches 28V and lasts for 100uS. The PWM pulses are disabled when OVP is enabled. By choosing an appropriate value of an external resistor between the RT Pin and GND, a suitable operating frequency can be generated. The relationship between the value of RT and the operating frequency is provided in Figure 13. TS Pin Over-Temperature Protection (OTP) An Over-Temperature Protection (OTP) function is integrated in the device.This function with external thermistor sensing will disable the PWM controller at 1V and supports high a temperature alert and prevents damage occurring in the application circuit. Figure 13. RT Resistor value vs. Operating Frequency Rev. 1.00 7 November 4, 2011 HT7L2102 Package Information 8-pin SOP (150mil) Outline Dimensions MS-012 Symbol Min. Nom. Max. A 0.228 ― 0.244 B 0.150 ― 0.157 C 0.012 ― 0.020 C' 0.188 ― 0.197 D ― ― 0.069 E ― 0.050 ― F 0.004 ― 0.010 G 0.016 ― 0.050 H 0.007 ― 0.010 α 0° ― 8° Symbol Rev. 1.00 Dimensions in inch Dimensions in mm Min. Nom. Max. A 5.79 ― 6.20 B 3.81 ― 3.99 C 0.30 ― 0.51 C' 4.78 ― 5.00 D ― ― 1.75 E ― 1.27 ― F 0.10 ― 0.25 G 0.41 ― 1.27 H 0.18 ― 0.25 α 0° ― 8° 8 November 4, 2011 HT7L2102 Reel Dimensions SOP 8N (150mil) Symbol Description Dimensions in mm A Reel Outer Diameter B Reel Inner Diameter 100.0±1.5 C Spindle Hole Diameter 13.0 +0.5/-0.2 D Key Slit Width T1 Space Between Flange T2 Reel Thickness Rev. 1.00 330.0±1.0 2.0±0.5 12.8 +0.3/-0.2 18.2±0.2 9 November 4, 2011 HT7L2102 Carrier Tape Dimensions SOP 8N (150mil) Symbol Description W Carrier Tape Width P Cavity Pitch E Perforation Position Dimensions in mm 12.0+0.3/-0.1 8.0±0.1 1.75±0.10 F Cavity to Perforation (Width Direction) 5.5±0.1 D Perforation Diameter 1.55±0.1 D1 Cavity Hole Diameter 1.50 +0.25/-0.00 P0 Perforation Pitch 4.0±0.1 P1 Cavity to Perforation (Length Direction) 2.0±0.1 A0 Cavity Length 6.4±0.1 B0 Cavity Width 5.2±0.1 K0 Cavity Depth t Carrier Tape Thickness C Cover Tape Width Rev. 1.00 2.1±0.1 0.30±0.05 9.3±0.1 10 November 4, 2011 HT7L2102 Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shenzhen Sales Office) 5F, Unit A, Productivity Building, No.5 Gaoxin M 2nd Road, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538, USA Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com Copyright© 2011 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek's products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. Rev. 1.00 11 November 4, 2011 盛群推出HT7L2102/7L2103通用隔离式LED照明驱动控制IC Search 下载DataSheet HT7L2102 HT7L2103 盛群推出HT7L2102/7L2103通用隔离式LED照明驱动控制IC 进一步信息 11/21/2011 与我们联络 盛群在相继推出AC-DC电源管理IC与非隔离式LED照明驱动IC后，积极的 整合了相关技术与经验，正式推出通用隔离降压型LED照明驱动控 制IC-HT7L2102与HT7L2103。 HT7L2102与HT7L2103都是逐周期电流控制、峰值电流控制法的脉宽调变 电源管理芯片。两者均支持完整的LED保护功能：短路保护(Short Circuit Protection, SCP)、过电压 保护(Over Voltage Protection, OVP)、软启动机制(Soft-Start)、以及过温度保护(Over Temperature Protection)。此外针对EMI的抑制加入 了Frequency Jitter功能，让EMI可以降低5~8dB，大幅节 省EMI成本。面对多样化的LED负载条件与串并 数，HT7L2102与HT7L2103都内建了先进的Green Mode节电 模式，使得用户可以只用一种电路设计便可以驱动各种不同 的LED负载串并数而不会降低转换效率，使得备料的成本大大降 低，并加快产品推出的速度。而在调光的支持上，两者都内建支 持PWM调光接口。 HT7L2102是针对T8/T9灯管的应用而设计，具备绝佳的恒流能 力，在全电压输入(Vac=90V~265V)的情况下可以将电流变动量 保持1%以下。而其过温度保护采用外部热敏电阻(External Thermistor)感知来驱动，可以将热敏电阻放在系统任何可能的发热点，达到最佳的过温保护效果。 HT7L2103是针对E26/E27球灯泡的应用而设计。因为E26/E27球灯泡的机构空间 小，所以HT7L2103整合更多功能，使得在有限的空间中可以做到隔离式的AC-DC电 源驱动功能，而其优秀的恒流能力可以在Primary-Side Feedback的架构下，全电压 输入(Vac=90V~265V)的使用条件下将电流变动量保持5%以下。HT7L2103的过 温保护不需要外部热敏电阻，内建在IC里，使得HT7L2103可以兼顾低成本的与高安 全性的过温度保护需求。 http://www.holtek.com.cn/china/news/products/111611-2.htm[2012-7-4 18:39:16]