HT7L5610 Primary Side Regulation Off Line LED Driver with Active PFC Features General Description • Primary-side current sensing and regulation without an opto-coupler The HT7L5610 is a single-stage, isolated, primaryside offline LED lighting controller that has the benefits of high power factor and a fully integrated power MOSFET. Control of this power MOSFET is implemented by regulating a constant LED current accurately from the primary-side. This can significantly simplify the LED lighting system design by eliminating the secondary-side feedback components and the usually required opto-coupler. The extremely low start-up current and quiescent current reduces the total power consumption to provide a high efficiency solution for lighting applications. • Integrated 650V MOSFET • Wide AC input range - from 85VAC to 265VAC • High Power Factor of >0.9 without additional circuitry • Accurate constant current (< ±3%) • Low start-up current which reduces power dissipation • Full protection functions for enhanced safety ♦♦ Gate driver output voltage clamp ♦♦ VCC over voltage protection - VCC OVP ♦♦ VCC under-voltage lockout with hysteresis - VCC UVLO ♦♦ Output LED string over current protection ♦♦ Output LED string short / open protection ♦♦ On-chip over temperature protection - OTP The device provides several protection functions, which include VCC Under Voltage Lockout (UVLO), Over Current Protection (OCP), Output LED String Open Protection, Output LED String Short Protection, VCC Over Voltage Protection (OVP) and LeadingEdge Blanking (LEB) for current sensing. Additionally and to ensure system reliability, the device includes a fully integrated thermal protection function. • 8-pin DIP package The high level of functional integration minimises the external component count giving major advantages in terms of cost and circuit board area. The device is supplied in an 8-pin DIP package. Applications • General illumination • E26/27, T5/T8 LED Lamp • Other LED Lighting Applications Application Circuits VOUT+ ACIN VOUT- SOURCE DRAIN DRAIN CS GND VCC COMP ZCD HT7L5610 Rev. 1.00 1 September 08, 2015 HT7L5610 Block Diagram Reference & Bias UVLO VCC Starter VCC OVP OTP OCP Logic Control ZCD Comparator Min Off Time EA Driver OCP PWM Generator COMP OTP OTP ZCD OVP ZCD DRAIN LEB OCP S&H SOURCE 0.3V GND CS Pin Assignment SOURCE CS GND COMP 1 8 2 7 3 6 4 5 DRAIN DRAIN VCC ZCD HT7L5610 8 DIP-A Pin Description Pin No. Symbol Description 1 SOURCE Internal high voltage power MOSFET source terminal 2 CS Current sense pin. A resistor is connected to sense the MOSFET current. 3 GND Ground pin 4 COMP Loop compensation pin. A capacitor is placed between COMP and GND. 5 ZCD Connected to a resistor divider from an auxiliary winding to sense the output voltage. 6 VCC Power supply pin DRAIN Internal high voltage power MOSFET drain terminal 7,8 Rev. 1.00 2 September 08, 2015 HT7L5610 Absolute Maximum Ratings Parameter Range Internal MOSFET Drain Source Voltage -0.3V to 650V VCC Supply Voltage -0.3V to 27V Input Voltage to CS Pin -0.3V to 6V Output Voltage at COMP Pin -0.3V to 6V Maximum Current at ZCD Pin 3mA (source), 3mA (sink) Maximum Operating Junction Temperature 150°C Storage Temperature Range -55°C to 150°C Recommended Operating Ranges Parameter Range VCC Supply Voltage 10V~20V Operating Junction Temperature -40°C~125°C 13.8W@240mA, 90~265VAC 21.8W@365mA,180~265VAC Output Power Electrical Characteristics Symbol Parameter (VCC=12V, Ta=25°C) Test Condition Min Typ Max Unit Power Supply (VCC Pin) VCCON UVLOON — — 18 — V VCCOFF UVLOOFF — — 7.5 — V V VCCHYS UVLO Hysteresis — 10 — — VOVP1 VCC OVP Trip Point — 21.5 24.0 26.5 V ISTART Start-up Current Before turn-on, @VCC=UVLOON-1V — 10 20 μA IQ Quiescent Current No switching — 0.7 1.0 mA 291 300 309 mV Error Amplifier VFB Feedback Reference Voltage Ta=25°C Current Sense Comparator tLEB Leading Edge Blanking Time — — 400 — ns VOCP Current Limit Threshold — — 1.55 — V VSCP ZCD Pin Short Circuit Protection Threshold — — 0.40 — V — 6.1 — V — -0.7 — V — 150 — mV mV Zero Current Detector VZCDH Upper Clamp Voltage IZCD=2.5mA IZCD= -2.5mA VZCDL Lower Clamp Voltage VZCDA Positive-going Edge — VZCDT Negative-going Edge — — 50 — VOVP2 ZCD pin OVP Level — 2.88 3.20 3.52 V tB_OVP OVP Detection Blanking Time — — 1 — μs tSTART Start Timer Period — — 40 — μs tOFF Minimum Off Time — — 6.4 — μs — — 150 — °C — 4.3 — Ω 650 — — V Starter Over Temperature Protection OTP Over Temperature Trip Point Power MOSFET RDS Power MOSFET Switch ON Resistance @ VGS=10V, IDS=0.5A BVDSS Power MOSFET Drain-Source Voltage Rev. 1.00 @ VGS=0V, IDS<250μA 3 September 08, 2015 HT7L5610 16 1.6 14 1.5 operating current (mA) 1.4 12 1.3 10 1.2 8 1.1 6 4 -40 -20 0 20 40 60 tem perature (℃ ) 80 100 1 0.9 -40 120 20 40 60 tem perature (℃ ) 80 100 19 8.4 18.6 8 18.2 17.8 17.4 -20 0 20 40 60 tem perature (℃ ) 80 100 7.2 6.8 6.4 -40 120 120 7.6 Figure 3. UVLO_on vs. Temperature -20 0 20 40 60 tem perature (℃ ) 80 100 120 Figure 4. UVLO_off vs. Temperature 3.5 26 25.5 3.4 25 24.5 ZCD_OVP (V) VCC_OVP (V) 0 Figure 2. Operation Current vs. Temperature 17 -40 24 23.5 23 3.3 3.2 3.1 3 22.5 22 -40 -20 0 20 40 60 tem perature (℃ ) 80 100 2.9 -40 120 Figure 5. VCC_OVP vs. Temperature VFB (mV) -20 Figure 1. Start-up Current vs. Temperature UVLO_off (V) UVLO_on (V) start up current (uA) Typical Performance Characteristics 309 308 307 306 305 304 303 302 301 300 299 298 297 296 295 294 293 292 291 -40 -20 0 20 40 60 tem perature (℃ ) 80 100 0 20 40 60 tem perature (℃ ) 80 100 120 Figure 6. ZCD_OVP vs. Temperature 120 Figure 8. Temperature vs. Wide AC Voltage Figure 7. VFB vs. Temperature Rev. 1.00 -20 4 September 08, 2015 HT7L5610 Figure 9. Temperature vs. High AC Voltage Functional Description VCC Under Voltage Lockout – UVLO The HT7L5610 is a single-stage primary-side offline LED controller designed for isolated LED lighting applications. The device can achieve high Power Factor values and low THD without resorting to additional external circuits and can also generate high accuracy LED drive currents with very few external components. The device includes a UVLO feature which has about 10V of hysteresis. The PWM controller turns on when VCC is higher than 18V and turns off when VCC is lower than 7.5V. The hysteresis characteristics guarantee that the device can be powered by an input capacitor during start-up. When the output voltage increases to a certain value after start-up, VCC will be charged by an output through an auxiliary winding. Start-up Current Boundary Conduction Mode – BCM A very low start-up current, ISTART, allows the selection of a large value start-up resistor which reduces power dissipation. High power factor values are achieved by constant on-time operation. To implement constant on-time control, a 0.47µF capacitor is placed between the COMP pin and ground. The power MOSFET is turned on by inductor current zero-crossing detection. The current zero-crossing can be detected by a ZCD voltage. When the inductor current is at the zero crossing point, the voltage on the ZCD pin will drop rapidly. The HT7L5610 then detects the falling edge and turns on the Power MOSFET. The boundary conduction mode provides low turn-on switching losses and high conversion efficiency. Constant Current Control LEB on CS – Leading-Edge Blanking Power Factor Correction The device accurately regulates the LED current by sensing the primary-side information. The LED current can be easily set using the following formula: I OUT ≈ Each time the internal power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid faulty triggering, a 400ns leadingedge blank time is generated. During this blanking period, the current-limit comparator is disabled and can therefore not switch off the gate driver. 1 VFB N P × × 2 RCS N S Where N P is the primary winding and N S is the secondary winding; V FB (=300mV) is the internal voltage reference and R CS is the external current sensing resistor. Rev. 1.00 OVP on VCC – Over Voltage Protection In order to prevent PWM controller damage, the device includes an OVP function on VCC. Should the VCC voltage be higher than the OVP threshold voltage of 24V, the PWM controller will stop operating immediately. When the VCC voltage decreases below the UVLO off level, the controller will reset. 5 September 08, 2015 HT7L5610 LED Open Protection – ZCD OVP OCP – Over Current Protection The ZCD pin voltage is set by a resistor divider, RTOP (top resistor) and R BOT (bottom resistor), and an auxiliary winding due to the coupling polarity between the auxiliary winding and the secondary winding of the transformer. Once the ZCD voltage exceeds 3.2V after a blanking time about 1µs to allow the leakage inductance ringing to be fully damped, the ZCD OVP is triggered and the IC stops switching. It can be reset by re-starting the voltage on VCC pin. The OVP voltage can be adjusted using the following equation: The device includes an over current protection function on the CS pin. An internal circuit detects the current level and when the current is larger than the over current protection threshold level, VOCP/RCS, the gate output will remain at a low level. VOUT _ OVP = 3.2 × (1 + LED Short Protection – SCP The output voltage drops when a number of LEDs in a string are shorted resulting in a voltage drop at VCC. Once the VCC drops below 7.5V, the device will stop operating. Under such situations, the start-up operation will recharge the VCC pin through the startup resistor and the device will enter the UVLO hiccup mode. RTOP N ) × S + VD RBOT NA Where NS is secondary winding, NA is the auxiliary winding, V D is the forward bias voltage of the secondary diode. Rev. 1.00 Thermal Protection A thermal protection feature is included to protect the device from excessive heat damage. When the junction temperature exceeds a threshold of 150°C, the thermal protection function will turn off the drain source terminal terminal immediately. When the VCC decreases below the UVLO off level, the controller will reset. 6 September 08, 2015 HT7L5610 Package Information Note that the package information provided here is for consultation purposes only. As this information may be updated at regular intervals users are reminded to consult the Holtek website for the latest version of the package information. Additional supplementary information with regard to packaging is listed below. Click on the relevant section to be transferred to the relevant website page. • Further Package Information (include Outline Dimensions, Product Tape and Reel Specifications) • Packing Meterials Information • Carton information Rev. 1.00 7 September 08, 2015 HT7L5610 8-pin DIP (300mil) Outline Dimensions Symbol Min. Nom. Max. A 0.355 0.365 0.400 B 0.240 0.250 0.280 C 0.115 0.130 0.195 D 0.115 0.130 0.150 E 0.014 0.018 0.022 F 0.045 0.060 0.070 G — 0.100 BSC — H 0.300 0.310 0.325 I — — 0.430 Symbol Rev. 1.00 Dimensions in inch Dimensions in mm Min. Nom. Max. 10.16 A 9.02 9.27 B 6.10 6.35 7.11 C 2.92 3.30 4.95 D 2.92 3.30 3.81 E 0.36 0.46 0.56 F 1.14 1.52 1.78 G — 2.54 BSC — H 7.26 7.87 8.26 I — — 10.92 8 September 08, 2015 HT7L5610 Copyright© 2015 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 9 September 08, 2015