JW7727SOTB#TR

JW7727 Synchronous Rectifier Controller Preliminary Specifications Subject to Change without Notice DESCRIPTION FEATURES JW ®7727 is a synchronous rectifier controller, used for the secondary side rectification of isolation topologies, such as Active Clamp Flyback and CCM/QR/DCM Flyback. By driving an external MOSFET, JW7727 is able to significantly improve the efficiency comparing with the conventional Diode rectifier.  When JW7727 senses Vds of MOSFET less than -150mV, it turns on the MOSFET. Once the Vds is greater than -10mV, JW7727 turns off the MOSFET. JW7727 supports multiple operation modes, such as DCM, CrCM, CCM and Quasi-Resonant. By implementing the Joulwatt proprietary technology, JW7727 is able to handle CCM operation.      Supports Active Clamp Flyback, DCM, Quasi-resonant, and CCM Flyback Support High-side and Low-side Rectification Output Voltage Directly Supply VCC Low Quiescent Current Fast Driver Capability for CCM Operation SOT23-6 Package APPLICATIONS    Active Clamp Flyback Converters Adaptor LCD and PDP TV and Flyback JW7727 is available in SOT23-6 package. Company’s Logo is Protected, “JW” and “JOULWATT” are Registered Trademarks of JoulWatt technology Inc. TYPICAL APPLICATION Vo Co Vin Ro Cin GT VO SW VCC VT GND JW7727 JW7727 Typical Application for Low-side. JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 1 JW7727 JoulWatt Vo Vin Cin GT SW GND VT VCC VO Ro JW7727 JW7727 Typical Application for High-side. JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 2 JW7727 JoulWatt ORDER INFORMATION DEVICE1) PACKAGE JW7727SOTB#TR SOT23-6 TOP MARKING2) ENVIRONMENTAL3) JWJX□ YW□□□ Green Notes： JW # TR 1) JW 2) Line1: Tape and Reel (If TR is not shown, it means Tube) Package Code Part No. YW Lot number Product code Line2: Week code Joulwatt LOGO Year code 3) All Joulwatt products are packaged with Pb-free and Halogen-free materials and compliant to RoHS standards. PIN CONFIGURATION TOP VIEW VO 1 6 SW 2 5 GT VT 3 4 VCC GND SOT23-6 ABSOLUTE MAXIMUM RATING1） SW PIN .......................................................................................................................................-1 to 150V VO PIN .......................................................................................................................................-0.3 to 30V VCC, GT PIN...............................................................................................................................-0.3 to 10V VT PIN......... ....... ........................................................................................................................-0.3 to 7V Junction Temperature 2) 3)....................................................................................................................150ºC Lead Temperature …..........................................................................................................................260ºC Storage Temperature….........................................................................................................-65ºC to150ºC Continuous Power Dissipation(TA=+25℃)4) SOT23-6…....…............................................................0.56W ESD Susceptibility (Human Body Model) ............................................................................................. 2kV JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 3 JW7727 JoulWatt RECOMMENDED OPERATING CONDITIONS SW Pin....................................................................................................................................4.7V to 130V VO Pin......................................................................................................................................4.7V to 27V VCC, GT PIN...............................................................................................................................4V to 8V Operation Junction Temperature(TJ)................................................................................... -40ºC to 125ºC THERMAL PERFORMANCE5） θJA θJc SOT23-6..............................................................................................................................220 ...130ºC/W Note： 1) 2) 3) 4) 5) Exceeding these ratings may damage the device. These stress rating do not imply function operation of the device at any other conditions beyond those indicated under RECOMMENDED OPERATING CONDITIONS. Continuous operation over the specified absolute maximum operating junction temperature may damage the device. The device is not guaranteed to function outside of its operating conditions. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)-TA)/ θJA. Measured on JESD51-7, 4-layer PCB. JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 4 JW7727 JoulWatt ELECTRICAL CHARACTERISTICS TA = 25ºC, unless otherwise stated Item Symbol Condition Min. Typ. Max. Units 7.5 8 8.5 V VCC Section VCC Voltage VCC SW=40V, VCC=2.2uF VCC Startup Voltage VCC_Startup 4.5 V VCC UVLO VCC_UVLO 3.9 V GT=5nF,VCC=2.2uF 900 uA VCC=4.5V, VCC=2.2uF 110 uA Operation Current (GT On) IVCC Quiescent Current Iq Gate Section Gate Turn on Threshold VMOS_ON -150 mV Gate Turn off Threshold VMOS_OFF -10 mV VCC V Gate Turn on Voltage VGT SW=32V, VCC=2.2uF Maximum Gate Pull Up Current 6) IGU 0.6 A Maximum Gate Pull Down Current 6) IGD 4.0 A Gate Minimum on Time TMIN_ON 1.1 uS Absolutely Minimum off Time TMIN_OFF 350 nS Turn-on Total Delay 6) TDON CLOAD=4.7nF 50 nS Turn-off Total Delay 6) TDOF CLOAD=4.7nF 20 nS SW=40V, VCC=6V 80 mA -40 mV -160 mV SW and VO Section VCC Charge Current SW Regulation Voltage ISW_CHG VMOS_REG VMOS_REG_MA SW Control Voltage MAX X VO Enable Charge Voltage VO_EN VCC=4V, SW=0V, rising 4.6 V VO Disable Charge Voltage VO_DIS VCC=4V, SW=0V, falling 4.5 V VO Charge Current IVO_CHG 40 mA SW=0V, VCC=6V， VO=12V 6) Guaranteed by design. JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 5 JW7727 JoulWatt PIN DESCRIPTION Part No. SOT23-6 Name Description 1 VO Output voltage sensing and charging to VCC. 2 GND 3 VT 4 VCC 5 GT Drive the external MOSFET. 6 SW External power MOSFET drain voltage sensing. Charging to VCC. Ground. Set the voltage-second product. Power supply. Bypass a capacitor between VCC and GND. BLOCK DIAGRAM VO LDO Voltage Detection UVLO & Regulator SW LDO GND Voltage Detection & Regulation Minimum off Time Control Logic Driver VCC GT Voltagesecond Set VT JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 6 JW7727 JoulWatt FUNCTIONAL DESCRIPTION Operation Turn On Phase JW7727 is a synchronous rectifier controller which combined with external MOSFET can replace the Schottky Barrier Diode. It supports all operations, such as DCM, CrCM, (Quasi-Resonant) and CCM when adopted in Active Clamp Flyback and Flyback converters. There are two conditions for the JW7727 to turn on the SR, i.e. VSW, voltage-second value on SW pin when primary side switch is on, and the turn on phase is shown in Fig. 1. Startup During the startup period, when the VCC is charged up by the two internal LDOs connected to SW and VO pin respectively. When VO is lower than 4.5V (falling), JW7727 can power itself through the internal LDO connected to SW pin during the SR turn-off period, which means primary the primary side MOSFET is turned on and SW presents a positive voltage. A capacitor between VCC and GND is required to store the energy and supply to IC during the SR turn-on period. When VO is above 4.6V (rising), the VO pin charges VCC pin. Once the VCC voltage exceeds VCC_Startup, the JW7727 exits the UVLO. If VCC is lower than VCC_UVLO, the external MOSFET is turned off. The current flows though body diode before the VCC reaches to the startup voltage Vcc_startup. 1) VSW: when the synchronous MOEFET is conducting, current flows through the body diode of MOSFET, which generates a negative voltage VSW across it. When VSW is lower than VMOS_ON, the part will pull the gate high to turn on the synchronous MOSFET after turn on delay time TDON if the other condition is met. 2) Volt-second of SW: in DCM and QR operation, there are parasitic oscillations. In some applications, the drain resonant voltage may fall below the SR turn on threshold, especially for the first couple rings. SR could be falsely turned on, which may cause shoot through issue and result in high power loss. The volt-second value of SW pin can be used to distinguish the parasitic ring from normal primary side switch on. The threshold can be set by the resistance at VT pin. The curve is shown in Fig. 2. ISR VSW Under-Voltage Lockout (UVLO) VO 1V When the VCC is below UVLO threshold, the external MOSFET is turned off and pulled low internally. Once the VCC exceeds the startup voltage Vcc_startup, the parts is activated again. -10mV -40mV -150mV TDOFF_PRO VGT 2V~3V 1V t0 t1 t2 t4 TDON t6 t8 TDOFF Fig. 1 Turn on delay and turn off delay JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 7 JW7727 JoulWatt The VSW rises when the current follow through the MOSFET decreases. The gate voltage will be decreased to increase its on resistance and regulate the VSW around -40mV. voltage-second value vs. VT resistance 45 40 35 V*us 30 25 20 15 10 5 0 0 50 100 150 200 250 300 350 VT resistance (kΩ) Fig. 2 Volt-second value vs. VT resistance Minimum On Time (MOT) It should be noted that the typical regulation threshold (-40mV) during MOSFET on time is not fixed, it can be internally changed to ensure the proper operation under CCM mode. Turn Off Phase After synchronous MOSFET conducting, once When the synchronous MOSFET is turned on, the voltage VSW touches the MOSFET turn off there is a minimum on time for the SR. The VSW threshold (-10mV), the gate is pulled to low after voltage may have a parasitic ring when the a turn off delay time TDOFF. A 350nS blanking synchronous MOSFET turns on. So, a minimum time is necessary to avoid error trigger. The on time (MOT) is very important to avoid the banking time is reset once VSW rises above MOSFET turn off threshold is false triggered. 2.5V. Conducting Phase Output Voltage Detection When the synchronous MOSFET is turned on, the drain source voltage VSW it is determined by its on resistance and the current through it. The part adjusts the gate voltage and regulates the VSW to a internal threshold (typical -40mV) after the synchronous MOSFET turn on. When the VSW is lower than -40mV, the gate keep its maximum voltage. And the synchronous MOSFET is fully on. JW7727 Rev.0.12 2021/02/23 The JW7727 has output voltage detection function via VO pin. VCC is charged from VO pin when VO is higher than 4.6V to save power loss caused by the LDO when charging from SW pin to VCC pin. When VO drops below 4.5V, the JW7727 is powered from SW pin. JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 8 JW7727 JoulWatt PACKAGE OUTLINE SOT23-6 UNIT: mm D MILLIMETER SYMBOL MIN A2 A NOM MAX 1.05 — 1.25 A1 0 — 0.15 A2 1.00 1.10 1.20 b 0.30 — 0.50 θ A L A1 E1 E c 0.10 — 0.20 D 2.820 2.926 3.026 E 2.60 2.80 3.00 E1 1.500 1.626 1.726 0.95 BSC e L 0.30 0.40 0.60 θ 0° — 8° Pin #1 b e QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPAE Sprocket Holes 1 2 1 2 1 2 3 4 3 4 3 4 Procket Quadrants JW7727 Rev.0.12 2021/02/23 Package Type Pin1 Quadrant SOT23-6 3 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 9 JW7727 JoulWatt IMPORTANT NOTICE  Joulwatt Technology Inc. reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein.  Any unauthorized redistribution or copy of this document for any purpose is strictly forbidden.  Joulwatt Technology Inc. does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Copyright © 2020 JW7727 Incorporated. All rights are reserved by Joulwatt Technology Inc. JW7727 Rev.0.12 2021/02/23 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. This document contains information of a product under development. Joulwatt reserves the right to change this product without notice. 10