AL1677
Document overview
- Manufacturer or author: Diodes Incorporated
- PDF pages: 13
Technical content
Features
> 90% Efficiency Valley Detection to Minimize Switching Loss Universal 85 to 277 VAC Input Range Internal MOSFET up to 500V Tight Current Sense Tolerance: ± 3% Low Startup Current: 170µA Low Operation Current: 100µA (Static) Standard Inductor (no auxiliary winding) Internal Protections - Undervoltage Lockout (UVLO) - Leading-Edge Blanking (LEB) - Cycle-by-cycle Overcurrent Protection(OCP) - Output Open/Short Protection(OVP/OSP) - Open-Load and Reload Detection - Thermal Foldback Function(TFP) - Over-Temperature Protection(OTP) SO-8 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Pin Assignments (Top View) GND ROVP NC VCC D D CS CS SO-8
Applications
Retrofit LED Lamps High Voltage DC-DC LED Driver General Purpose Constant Current Source Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s defin itions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. PART OBSOLETE - NO ALTERNATE PART
Document number: DS37526 Rev. 2 - 4 2 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Typical Applications Circuit OUT+ VCC CS GND U1 AL1677 C3 R1 AC Input DB1 ROVP NC CS D D 4 5 Pin Descriptions Pin Number Pin Name Function
1 GND Ground
2 ROVP Setting the Open Voltage of the Output
3 NC No Connection
4 VCC Power Supply for the Device
5,6 D Internal High Voltage MOSFET’s Drain 7,8 CS Current Sensing Functional Block Diagram VCC Management Fault Management VCC Clamp OSP OVP STOP LEB Constant Current Control Max Ton Limit STOP R S Q Toff Detection (ZCD) OVP OVP VCC CS GND ROVP 5,6 7,8 NC 3 D VOVP_REFTOFF OSP TOFF VOVP_REF VREFOTP UVLO OFF
Document number: DS37526 Rev. 2 - 4 3 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Absolute Maximum Ratings (@TA = +25° C, unless otherwise specified.) (Note 4) Symbol Parameter Rating Unit VCC Power Supply Voltage 18 V VD Voltage on D Pin AL1677-05BS-13 500 V AL1677-08BS-13 500 V AL1677-10BS-13 500 V AL1677-20BS-13 500 V ID Continuous Drain Current Tc = +25°C AL1677-05BS-13 0.5 A AL1677-08BS-13 0.8 A AL1677-10BS-13 1.0 A AL1677-20BS-13 2.0 A VCS Voltage on CS Pin -0.3 to 7 V VROVP Voltage on ROVP Pin -0.3 to 7 V TJ Operating Junction Temperature -40 to +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 10 seconds) +260 °C PD Power Dissipation and Thermal Characteristics (TA = +50°C) 0.65 W JA Thermal Resistance (Junction to Ambient) 190 °C/W ESD (Human Body Model) 2,000 V ESD (Machine Model) 200 V Note: 4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Condi tions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Symbol Parameter Min Max Unit TA (Note 5) Ambient Temperature -40 +105 °C Note: 5. The device can operate normally at +125°C ambient temperature under the condition that the junction temperature is less than +150°C.
Document number: DS37526 Rev. 2 - 4 4 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Electrical Characteristics (@TA = +25° C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit UVLO Section VTH (ST) Startup Threshold — — 14.5 — V VOPR(Min) Minimal Operating Voltage After Turn On — 8.5 — V Vcc_clamp Vcc Clamp Voltage — — 16.2 — V Standby Current Section IST Start-Up Current VCC = VTH (ST)-0.5V, Before Start Up — 170 — µA ICC (OPR) Operating Current Static — 100 — µA Internal High Voltage MOSFET RDS(on) Drain-Source On-State Resistance AL1677-05BS-13 — 24 26 Ω AL1677-08BS-13 — 16 20 AL1677-10BS-13 — 10 12 AL1677-20BS-13 — 5.4 6 IDS Continuous Drain-Source Current AL1677-05BS-13 — — 0.5 A AL1677-08BS-13 — — 0.8 AL1677-10BS-13 — — 1.0 AL1677-20BS-13 — — 2.0 VDS Drain-Source Voltage AL1677-05BS-13 500 — — V AL1677-08BS-13 500 — — AL1677-10BS-13 500 — — AL1677-20BS-13 500 — — IDSS Drain-Source Leakage Current AL1677-05BS-13 — — 1 µA AL1677-08BS-13 — — 1 AL1677-10BS-13 — — 1 AL1677-20BS-13 — — 1 ROVP Section VROVP Reference Voltage of ROVP pin — — 0.5 — V Current Sense Section VCS-REF Current Sense Reference — 0.388 0.400 0.412 V tON_MIN Minimum tON — 400 — 700 ns tON_MAX Maximum tON — — 35 — µs tOFF_MAX Maximum tOFF — — 200 — µs tOFF_MIN Minimum tOFF (Note 6) — — 6 — µs Thermal Foldback and Over Temperature Protection Section TREG Overheating Temperature Regulation — Shutdown Temperature (Notes 6 & 7 & 8) — — +170 — °C Notes: 6. These parameters, although guaranteed by design, are not 100% tested in production. 7. The device will latch when OTP happen and the device won’t operate constantly at this temperature. 8. This regulation temperature is junction temperature.
Document number: DS37526 Rev. 2 - 4 5 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED -40 -20 0 20 40 60 80 100 12070 100 110 120 130 140 Operating Current (A) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 12012.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 Start-up Voltage (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 1206.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 Minimal operating voltage (V) Ambient Temperature ( o Performance Characteristics (Note 9) Start-up Voltage vs. Ambient Temperature Start-up Current vs. Ambient Temperature Minimal Operating Voltage vs. Ambient Temperature Operating Current vs. Ambient Temperature VCS Reference vs. Ambient Temperature VROVP Reference vs. Ambient Temperature -40 -20 0 20 40 60 80 100 120 0.20 0.25 0.30 0.35 0.40 0.45 0.50 VCS Reference (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 1200.30 0.35 0.40 0.45 0.50 0.55 0.60 VROVP Reference (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 120 130 140 150 160 170 180 Start-up Current (A) Ambient Temperature ( o
Document number: DS37526 Rev. 2 - 4 6 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Performance Characteristics (continued) (Note 9) VCC Clamp Voltage vs. Ambient Temperature Vcs Reference vs. Ambient Temperature Note: 9. These electrical characteristics are tested under DC condition. The ambient temperature is equal to the junction temperature of the device. -40 -20 0 20 40 60 80 100 120 VCC Clamp Voltage (V) Ambient Temperature ( o -40 -20 0 20 40 60 80 100 120 140 160 1800.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Vcs reference (V) Ambient Temperature ( o
Document number: DS37526 Rev. 2 - 4 7 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED
Application Information
The AL1677 is designed for single-inductance buck application and is an extremely low BOM cost solution widely used in non-isolated situations. The AL1677 operates at boundary conduction mode (BCM) which can get good EMI performance. The device internally integrates a 500V high - voltage MOSFET. The AL1677 adopts a novel method to detect the tOFF time and achieve an extremely low operation current, so the device does not need the auxiliary winding for V CC supply and detect ing the t OFF time. It also has good constant current control which can guarantee the system current accuracy. OUT+ VCC CS GND U1 AL1677 C3 R1 AC Input DB1 ROVP NC CS D D 4 5 Figure 1 Typical Application Circuit Start-up and Supply Voltage Before start-up, the VCC capacitor C2 is charged by the startup resistors (R1, R2) from the high voltage mains. W hen the start-up voltage is reached, the AL1677 starts switching. During normal operation, the VCC supply is provided by s tart-up resisters (R1, R2) and internal source driver circuit. The AL1677 has an internal VCC clamp voltage (typical 16.2V), which is limited by one internal active Zener diode. When VCC voltage drops to b elow the under voltage lockout (UVLO), switching is stop, the IC can restart when the voltage on VCC pin is exceeding the startup voltage (VTH (ST)). Protections Under Voltage Lockout (UVLO) When the voltage on the VCC pin drops to below V OPR(Min), the IC stops switching. The IC can restart when the voltage on VCC is exceeds the startup voltage (VTH(ST)) Leading-Edge Blanking (LEB) To prevent false detection of the peak current of the inductor, a blanking time following switch-on is designed. When the internal switch turns on, a short current spike can occur because of the capacitive discharge of the voltage over the drain and source. It is disregarded during the LEB time (tON_MIN). Cycle-by-cycle Over Current Protection (OCP) The AL1677 has a built-in peak current detector. It triggers when the voltage on CS pin reaches the peak level VCS_CLAMP. The R5 is connected to the CS pin to sense the current of the inductor. The maximum peak current (IPEAK(MAX)) of the inductor can be calculated as below: _ REF CS PEAK VI R The detection circuit is activated after the LEB time. When the detection circuit sense the CS voltage is higher than 0.4V, the IC will turn off the switching to limit the output current. It automatically provides protection for the maximum LED current during operation. A propagation delay exists between over current detection and actual source-switch off, so the actual peak current is a little higher than the OCP level set by the R5. Output-Short Protection (OSP) When LED is shorted, the device cannot detect the tOFF time, and the device controls the system operation at 5kHz low frequency.
Document number: DS37526 Rev. 2 - 4 9 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Application Information (continued) R VI REFCS peak Where, VCS_REF is the reference of the current sense, and the typical value is 0.4V. R5 is the current sense resistor. In no PF buck topology, the system operates at boundary conduct mode. The output current is: peakmeano II 2 Therefore, the current sense resistor R5 is determined: meano REFCS I VR 15 Inductance Selection (L1) The AL1677 controls the system operating at boundary conduction mode, and the systems’ operating frequency does not keep constant because of the fluctuation of the bus voltage. Set the minimum switching frequency fmin at the maximum bus voltage, and the buck inductance value L1 can be calculated by: min__ 5)2(1 fVV VRVVL rmsinrefcs oormsin Where, Vo is the output voltage. Vin_rms is the RMS value of the input voltage. According to the Faraday’s Law of Induction, the winding number of the inductance can be calculated by: 11 _ RBA VL BA ILN me REFCS me peak L Where, Ae is the core effective area. Bm is the maximum magnetic flux density. The AL1677 has designed the minimum tON time and maximum tON time. The tON_MIN is about 700ns and the tON_MAX time is about 35µs. In buck topology we can get the equation Vin_rms-VO=L*Ipeak/tON. If the inductance is very small, leading the tON to become smaller, when the system’s tON is smaller than tON_MIN, the device cannot detect the peak current of the system, leading to incorrect output current. If the inductance is very large, leading tON to become larger when the system’s tON is larger than the tON_MAX, the system’s output current will decrease because of the limit of the tON_MAX. Therefore, the suitable value of the inductance is very important. The AL1677 tOFF_MIN time is about 6µS and tOFF_MAX time is about 200µs. In buck topology we use the equation VO=L*Ipeak/tOFF. If the inductance is very small, leading the tOFF to become much smaller when the system’s tOFF is smaller than tOFF_MIN, the system will enter DCM mode, and the output current will be incorrect. If the inductance is very la rge, leading tOFF to become much larger when the system ’s tOFF is larger than the tOFF_MAX, the system will enter CCM mode, and the output current will also be incorrect. Therefore, the suitable value of the inductance is very important. Consider these parameters, two examples of the typical application inductance is recommended as below: System Spec. Inductance Value System Frequency TON Min TOFF 60V/150mA (185~265VAC) 2.3mH 60K(230 VAC) 2.5µS(265 VAC) 11.5µS 42V/100mA (85~265 VAC) 2.5mH 62K(230 VAC) 1.7µs(265 VAC) 12.1µS
Document number: DS37526 Rev. 2 - 4 10 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Application Information (continued) Recommended Applications The AL1677 integrates different MOSFETs to adapt different wattage applications. The output current is limited by the internal integrated MOSFET, and the SO -8 package’s heat dissipation capability. The minimum output voltage is limited by the LEB tim e, and is recommended to 15V. The recommended application is given below: Device Output Power Coverage Maximum Output Current (Note 10) Minimum Output Voltage AL1677-05BS-13 ≤5W ≤100mA 15V AL1677-08BS-13 ≤8W ≤120mA 15V AL1677-10BS-13 ≤10W ≤180mA 15V AL1677-20BS-13 ≤15W ≤240mA 15V Note: 10. The higher output current is possible with extra power dissipation solution.
Document number: DS37526 Rev. 2 - 4 11 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED
Ordering Information
08 : 0.8A AL1677–XX X XX–13 Mosfet VoltageCurrent Option B: 500V S : SO-8 Package Packing 13 :13" Tape & Reel 10 : 1.0A 20 : 2.0A 05 : 0.5A Part Number Package Code Package 13” Tape and Reel Quantity Part Number Suffix AL1677-05BS-13 S SO-8 4,000/Tape & Reel -13 AL1677-08BS-13 S SO-8 4,000/Tape & Reel -13 AL1677-10BS-13 S SO-8 4,000/Tape & Reel -13 AL1677-20BS-13 S SO-8 4,000/Tape & Reel -13 Marking Information 1677- ZZZ (Top View) YY WW X X Part Number 1677-05B for 0.5A/500V 1677-08B for 0.8A/500V 1677-10B for 1.0A/500V 1677-20B for 2.0A/500V Logo WW : Week : 01~52; 52 YY : Year : 15,16,17 ~ X X : Internal Code 8 7 6 5 1 2 3 4 represents 52 and 53 week
Document number: DS37526 Rev. 2 - 4 12 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED Package Outline Dimensions (All dimensions in mm (inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. SO-8 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SO-8 SO-8 Dim Min Max A - 1.75 A1 0.10 0.20 A2 1.30 1.50 A3 0.15 0.25 b 0.3 0.5 D 4.85 4.95 E 5.90 6.10 E1 3.85 3.95 e 1.27 Typ h - 0.35 L 0.62 0.82 0° 8° All Dimensions in mm Dimensions Value (in mm) X 0.60 Y 1.55 C1 5.4 C2 1.27 X Y
Document number: DS37526 Rev. 2 - 4 13 of 13 www.diodes.com June 2020 © Diodes Incorporated AL1677 OBSOLETE – PART DISCONTINUED IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries r eserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability a rising out of the application or u se of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applic ations shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and i ts representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may b e covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as criti cal components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or s upport that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2020, Diodes Incorporated www.diodes.com