APR34709

Document overview

  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 13

Technical content

Features

  • Synchronous Rectification for DCM Operation Flyback
  • Eliminate Resonant Ring Interference
  • Fast Detector of Supply Voltages
  • Fewest External Components  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-Q100/101/104/200, 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 SO-8EP DRISR VDET AREF VCC DRAIN GND GND VDD Top View Note: The DRAIN pin of internal MOSFET is exposed PAD, which is at the bottom of IC (the dashed box). The secondary current should flow from GND (pins 7 and 8) to this exposed PAD.

Applications

  • Adapters/chargers for cell/cordless phones, ADSL modems, MP3 and other portable apparatus
  • Standby and auxiliary power supplies 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 definitions of Halogen - and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as thos e which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) an d <1000ppm antimony compounds. NOT RECOMMENDED FOR NEW DESIGN CONTACT US

Document number: DS41354 Rev. 5 - 3 2 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Typical Applications Circuit C21 C22 APR34709 VCC AREF DRAINDRAIN GND GND VDET DRISR RAREF C23 R21 C24VDD CAREFC23 Pin Descriptions Pin Number Pin Name Function

1 AREF Program a voltage reference with a resistor from AREF to GND, to enable synchronous

rectification MOSFET drive signal. 2 DRISR Synchronous rectification MOSFET drive. 3 VDD Internal power supply. It provides bias voltage for the internal logic circuit and th e MOSFET driver. Connect this pin to a capacitor. 4 VCC Power supply, connected with system output. Input of internal LDO and system output voltage sensing circuit. 5 DRAIN Drain pin of internal MOSFET. The drain voltage signal can be obtained from this pin.

6 VDET Synchronous rectification sense input and dynamic function output, connected to DRAIN

through a resistor. 7, 8 GND Source pin of internal MOSFET, connected to Ground. Exposed PAD DRAIN Drain pin of internal MOSFET. The secondary current should flow from GND (pins 7 and 8) to this DRAIN pad.

Document number: DS41354 Rev. 5 - 3 3 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Functional Block Diagram VTHON LEB Time VTHOFF Test Mode Fault Mode Gate Monitor Integrator ∫(VDET-VCC)dt VCC IAREF S R Q S R Q Drive DRISR AREF VDET VDD GND 7,8 Light Load Control 5, EP DRAIN PLR VDET LDO VREF VCC

Document number: DS41354 Rev. 5 - 3 4 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Absolute Maximum Ratings (Note 4) Symbol Parameter Value Unit VCC Supply Voltage -0.3 to 28 V VDET, VDRAIN Voltage at VDET, DRAIN Pins (Note 5) -2 to 60 V VAREF, VDRISR Voltage at AREF, DRISR Pins -0.3 to 7 V ID Continuous Drain Current 20 A IDM Pulsed Drain Current 80 A PD Power Dissipation at TA = +25°C 2.2 W θJA Thermal Resistance (Junction to Ambient) (Note 6) 54 °C/W θJC Thermal Resistance (Junction to Case) (Note 6) 11 °C/W TJ Operating Junction Temperature +150 °C TSTG Storage Temperature -65 to +150 °C TLEAD Lead Temperature (Soldering, 10s) +300 °C Notes: 4. Stresses greater than those listed under Absolute Maximum Ratings can cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to Absolute Maximum Ratings for extended periods can affect device reliability. 5. VDET pin is ESD sensitive. 6. Test condition: Device mounted on FR-4 substrate PC board, 2oz copper, with 1inch2 cooling area. Recommended Operating Conditions Symbol Parameter Min Max Unit VCC Supply Voltage 3.3 16 V TA Ambient Temperature -40 +85 °C

Document number: DS41354 Rev. 5 - 3 5 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Electrical Characteristics (@TA = +25°C, VCC = 5V, unless otherwise specified.) Symbol Parameter Condition Min Typ Max Unit Supply Voltage ( VCC Pin ) ISTARTUP Startup Current VCC = VSTARTUP-0.1V — 150 — µA IOP Operating Current VDET Pin Floating VCC = 5V — 150 — µA VSTARTUP Startup Voltage — — 2.4 — V VUVLO UVLO Voltage — — 2.2 — V VDD_ENABLE VDD Enable Falling Threshold at VCC Pin — — 4.6 — V VDD_DISABLE VDD Disable Rising Threshold at VCC Pin — — 4.75 — V VDD_HYS VDD Disable Hysteresis at VCC Pin — — 150 — mV VDD Pin VDD_MAX Internal Power Supply — — 5.5 — V Gate Driver VTHON Gate Turn On Threshold — 0 — 1 V VTHOFF Gate Turn Off Threshold — — — 0 mV tDON Turn On Delay Time From VTHON to VDRISR = 1V — 70 180 ns tDOFF Turn Off Propagation Delay Time From VTHOFF to VDRISR = 4V — 100 150 ns tRG Turn On Rising Time From 1V to 4V, VCC = 5V CL = 4.7nF — 50 100 ns tFG Turn Off Falling Time From 4V to 1V, VCC = 5V CL = 4.7nF — 20 100 ns tON_MIN Minimum On Time — 1.2 1.6 2 µs tOFF_MIN Minimum Off Time — — 2 — µs VDRISR SR Drive Voltage VCC < 4.6V — — VDD-0.1 V 4.75V < VCC < 5.5V — — VCC-0.1 VCC > 5.5V — — VDD_MAX -0.1 Kqs (Note 7) — — 0.42 — mA*μs VS_MIN Synchronous Rectification (SR) Minimum Operating Voltage (Note 8) — — — 4.5 V Green Mode (Note 9) tLL Minimum Off Time to Enter Green Mode — — 600 — μs Notes: 7. This item is used to specify the value of RAREF. 8. This item specifies the minimum SR operating voltage of VIN_DC, VIN_DC ≥ NPS*VS_MIN. 9. The parameter is guaranteed by design and characterization.

Document number: DS41354 Rev. 5 - 3 6 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Electrical Characteristics (@TA = +25°C, unless otherwise specified.) (continued) MOSFET Static Characteristics Symbol Parameter Conditions Min Typ Max Unit VDSS(BR) Drain to Source Breakdown Voltage VGS = 0V, ID = 0.25mA 60 — — V VGS(TH) Gate Threshold Voltage VDS = VGS, ID = 0.25mA 0.7 1.3 2 V IDSS Zero Gate Voltage Drain Current VDS = 60V, VGS = 0V — — 1 µA IGSS Gate to Source Leakage Current VGS = 4.5V, VDS = 0V — — ±50 µA RDS(ON) Drain to Source On-State Resistance VGS = 4.5V, ID = 3A — 8 — mΩ MOSFET Dynamic Characteristics Symbol Parameter Conditions Min Typ Max Unit Ciss Input Capacitance VGS = 0V, VDS = 25V f = 1MHz — 1872 — pF Coss Output Capacitance — 506 — Crss Reverse Transfer Capacitance — 43 — Qgs Gate to Source Charge VGS = 0V to 10V, VDD = 25V ID = 15A — 3.1 — nC Qgd Gate to Drain Charge (Miller Charger) — 4.8 — Qg Total Gate Charge VGS = 4.5V — 15 — Rg Gate Resistance — — 1.8 — Ω

© 2022 Copyright Diodes Incorporated. All Rights Reserved. MOSFET drain pin has moderate voltage ringing at this moment, whic h maybe impact on the VDET voltage and resulting in the turning-off fault. In Figure 1, the turn on blanking time tONMIN is to prevent the MOSFET drain-to-source voltage ringing effect. The DCM operation of the SR is described with timing diagram shown in Figure 1. threshold voltage VTHOFF, the APR34709 pulls the drive signal down after a turn-off delay (tDOFF). Figure 1. Typical Waveforms of APR34709 in DCM

© 2022 Copyright Diodes Incorporated. All Rights Reserved. keeping the controlled MOSFET on for at least the minimum on time. During the minimum on time, the turn off threshold is totally blanked. turning on the synchronous MOSFET. is to determine the volt-second product threshold. The APR34709 has a parameter, Kqs, which converts RAREF value to volt-second product. Incorporated’s PSR design, the Area1 value changes with primary peak current value and Area3 value generally keeps constant at all conditions. Figure 2. AREF Function will not begin and the SR driver will be disabled.

Document number: DS41354 Rev. 5 - 3 9 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Synchronous Rectification Principle Description (continued) Recommended Application Circuit Parameters The CAREF is suggested to parallel with the AREF resistor to keep the volt-second product threshold stable. And the recommended value of CAREF is 20nF. The recommended value of C24 is 100nF. The value of VDD capacitor C23 is 4.7µF. Green Mode at Light Load When the system is running with light load, rectifier conduction loss no l onger dominates the secondary-side power loss, in which condition it is preferred the SR MOSFET keeps off to save the driver loss. The APR34709 can sense the non-switching duration cycle by cycle , when the non-switching duration keeps longer than the inte rnal light load timing tLL, the IC will shut down the gate driver and keep it off for the next two cycles. VDD The VDD is the output of Pulse Linear Regulator and the internal linear regulator. It provides bias voltage for the controller. A capacitor (C23, typical 4.7µF) should be connected between the VDD pin and GND pins. A Pulse Linear Regulator is integrated in the controller to provided voltage to the VDD pin of the APR34709, so that the APR34709 can operate at Constant Current (CC) Mode, in which the system output voltage may drop to as low as 2V . The bias voltage is disabled when system output voltage is higher than 4.75V, in that case the system output provides voltage to VDD pin of the APR34709 through its internal LDO.

Document number: DS41354 Rev. 5 - 3 10 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709

Ordering Information

SP: SO-8EP 13 : 13" Tape and Reel Product Name Packing Part Number Part Number Suffix Package Temperature Range Marking ID Packing Qty. Carrier APR34709SP-13 -13 SO-8EP -40 to +85°C APR34709 4000 13” Tape and Reel Marking Information SO-8EP APR34709 (Top View) YY WW X X Logo WW : Week : 01 to 52; 52 YY : Year X X : Internal Code 8 7 6 5 1 2 3 4 represents week 52 and 53Marking ID

Document number: DS41354 Rev. 5 - 3 11 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Package Outline Dimensions (All dimensions in mm(inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8EP 5.800(0.228) 6.200(0.244) 1.270(0.050) 0.400(0.016) 3.800(0.150) 4.000(0.157) 0.150(0.006) TYP 0.250(0.010) 0.150(0.006) 1.350(0.053) 1.550(0.061) 2.110(0.083) 2.710(0.107) 2.750(0.108) 3.402(0.134) 5.100(0.201) Note: Eject hole, oriented hole and mold mark is optional. 0.300(0.012)

Document number: DS41354 Rev. 5 - 3 12 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. (1) Package Type: SO-8EP G E X Y Y1 Z Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) (mm)/(inch) (mm)/(inch) E (mm)/(inch)

Document number: DS41354 Rev. 5 - 3 13 of 13 www.diodes.com June 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. APR34709 IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who d esign with Diodes’ products. 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