TEA1792ATS GreenChip synchronous rectifier controller Rev. 1 — 10 August 2012 Objective data sheet 1. General description The TEA1792ATS is a member of the new generation of Synchronous Rectifier (SR) controller ICs for switched mode power supplies. Its high level of integration allows the design of a cost-effective power supply with a very low number of external components. The TEA1792ATS is a controller IC dedicated to synchronous rectification on the secondary side of discontinuous conduction mode and quasi-resonant flyback converters. The TEA1792ATS is fabricated in a Silicon-On-Insulator (SOI) process. 2. Features and benefits 2.1 Distinctive features Accurate synchronous rectification functionality Wide supply voltage range (8.5 V to 38 V) High level of integration, resulting in a very low external component count High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon Selectable regulation level for driver stage 2.2 Green features Low current consumption High system efficiency from no load to full load 2.3 Protection features UnderVoltage Protection (UVP) 3. Applications The TEA1792ATS is intended for adapters. The device can also be used in all other discontinuous conduction mode systems and quasi-resonant flyback systems that demand a highly efficient and cost-effective solution. TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 4. Ordering information Table 1. Ordering information Type number Package TEA1792ATS/N1 Name Description Version TSOP6 plastic surface-mounted package; 6 leads SOT457 5. Block diagram 9&& $ 6(/5(* '(7(&7,21 6833/< $1'%,$6 89/2 FRQWURO 656(16( 5 4 6 4 7,0(5 '5,9(5 P9 P9 P9 P9 GULYHU ,& *1' See Table 2 for details on the pinning. (1) 0.8 s and 0.95 s. Fig 1. TEA1792ATS block diagram TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 2 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 6. Pinning information 6.1 Pinning SRSENSE 1 GND 2 VCC 3 IC 6 DRIVER 5 n.c. 4 SELREG aaa-001385 Fig 2. TEA1792ATS pin configuration (TSOP6) 6.2 Pin description Table 2. TEA1792ATS Objective data sheet Pin description Symbol Pin Description SRSENSE 1 synchronous timing input GND 2 ground VCC 3 supply voltage SELREG 4 selection input for driver regulation level n.c 5 not connected DRIVER 6 driver output for SR MOSFET All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 3 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 7. Functional description 7.1 Introduction The TEA1792ATS is the controller for synchronous rectification used in discontinuous conduction mode and quasi-resonant flyback converters. 7.2 Start-up and UnderVoltage LockOut (UVLO) The IC leaves the undervoltage lockout state and activates the synchronous rectifier circuitry when the voltage on the VCC pin is above 8.5 V (typical). When the voltage drops below 8.0 V (typical), the undervoltage lockout state is entered again and the SR driver output is actively kept low. 7.3 Synchronous rectification After a negative voltage lower than Vact(drv) (220 mV typical) is sensed on the SRSENSE pin, the driver output voltage is driven HIGH. Then the external MOSFET is switched on. As soon as the SRSENSE voltage rises to Vreg(drv) (42 mV/30 mV) the driver output voltage is regulated to maintain the Vreg(drv) on the SRSENSE pin. When the SRSENSE voltage is above the Vdeact(drv) level (12 mV typical), the driver output is pulled to ground. After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked during the tact(sr)(min) (0.8 s typical). This action eliminates false switch-off due to high frequency ringing at the start of the secondary stroke. When the voltage on the SRSENSE pin is Vreg(drv), the driver output voltage is reduced. This reduction enables the external power switch to be switched off quickly when the current through the switch reaches zero. The zero current switch-off removes the need for a separate Standby mode to maintain high efficiency during the no-load operation. The zero current is detected by sensing a Vdeact(drv) (12 mV typical) level on the SRSENSE pin (see Figure 3). TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 4 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller VSRSENSE 0V Vdeact(drv) (-12 mV typ.) Vreg(drv) (-42 mV/-30 mV typ.) Vact(drv) (-220 mV typ.) primary current 0A secondary current 0A VDRIVER 0V aaa-000137 Fig 3. Synchronous rectification signals The level of the driver regulation voltage Vreg(drv) can be selected using the SELREG pin. When this SELREG pin is grounded, the typical Vreg(drv) equals 42 mV. When the SELREG pin is left open, the Vreg(drv) level equals 30 mV. Internally, the SELREG pin has a pull-up current source of 10 A. When this pin is short circuited to ground, the pin selects the lowest Vreg(drv). If the pin is left open, the highest Vreg(drv) value is selected. If the secondary stroke of the flyback converter is shorter than tact(sr)(min) short time (0.8 s typical), the driver output is disabled. This action guarantees stable operation for very low duty cycles. When the secondary stroke increases above tact(sr)(min), long time (0.95 s typical), the driver output is again enabled. 7.4 Supply management All internal reference voltages are derived from a temperature compensated, on-chip band gap circuit. 7.5 Driver The driver circuit to the external power MOSFET gate has a typical source capability of 400 mA and a typical sink capability of 2.7 A. These capabilities permit fast switch-on and switch-off of the power MOSFET for efficient operation. The source stage is coupled to the timer (see Figure 1). When the timer has finished, the source capability is reduced to a small current (5 mA typical) capable of keeping the driver output voltage at its level. TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 5 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller The output voltage of the driver is limited to 10 V (typical). This high output voltage drives all MOSFET brands to the minimum on-state resistance. During start-up conditions (VCC < Vstartup) and undervoltage lockout the driver output voltage is actively pulled low. 8. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured with respect to ground (pin 2); positive currents flow into the chip. The voltage ratings and current ratings are valid provided the other ratings are not violated. Symbol Parameter Conditions Min Max Unit VCC supply voltage continuous 0.4 +38 V VSRSENSE voltage on pin SRSENSE continuous - 120 V VSELREG voltage on pin SELREG continuous 0.4 5 V IDRIVER current on pin DRIVER duty cycle < 10 % 0.8 +3 A ISRSENSE current on pin SRSENSE 3 - mA - 0.27 W 55 +150 C 40 +150 C 2 +2 kV 500 +500 V Voltages Currents General Ptot total power dissipation Tstg storage temperature Tj junction temperature VESD electrostatic discharge voltage Tamb < 80 C human body model; JEDEC Class 2; all pins charged device model; JEDEC Class 3; all pins [1] [1] Equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor. 9. Thermal characteristics Table 4. TEA1792ATS Objective data sheet Thermal characteristics Symbol Parameter Conditions Typ Unit Rth(j-a) thermal resistance from junction to ambient JEDEC test board 259 K/W Rth(j-c) thermal resistance from junction to case JEDEC test board 152 K/W All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 6 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 10. Characteristics Table 5. Characteristics Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit 8.2 8.5 8.8 V 0.35 0.5 0.65 V 0.2 0.25 0.4 mA 0.8 1 1.2 mA 260 220 180 mV resistance between pins SELREG and GND < 15 k 55 42 30 mV resistance between pins SELREG and GND > 700 k 38 30 22 mV Supply voltage management (pin VCC) Vstartup start-up voltage Vhys hysteresis voltage ICC(oper) operating supply current [1] VCC = 8 V (VCC < Vstartup) under normal operation; no load on pin DRIVER Synchronous rectification sense input (pin SRSENSE) Vact(drv) driver activation voltage Vreg(drv) driver regulation voltage Vdeact(drv) driver deactivation voltage - 12 - mV td(act)(drv) driver activation delay time 50 75 100 ns tact(sr)(min) minimum synchronous rectification active time short time 0.6 0.8 1 s long time 0.7 0.95 1.2 s VSELREG = 2.5 V 12 10 8 A during minimum synchronous rectification time 0.45 0.4 0.35 A minimum synchronous rectification time has ended 6 5 4 mA voltage on pin DRIVER = 2 V 1 1.4 - A voltage on pin DRIVER = 9.5 V 2.2 2.7 - A 9 10 12 V Io(SELREG) output current on pin SELREG Driver (pin DRIVER) Isource VCC = 15 V; voltage on pin DRIVER = 2 V sink current Isink Vo(max) [1] source current VCC = 15 V maximum output voltage VCC = 15 V The VCC stop voltage is Vstartup Vhys. TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 7 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 11. Application information A switched mode power supply with the TEA1792ATS consists of a primary side discontinuous conduction mode flyback controller, a transformer and an output stage with a feedback circuit. A MOSFET (Qsec) is used for low conduction losses in the output state. The TEA1792ATS controls this MOSFET. The timing for the synchronous rectifier switch is derived from the voltage sensed on the SRSENSE pin. The resistor in the SRSENSE connection protects the TEA1792ATS from excessive voltages. The RSRSENSE resistor is typically 1 k. Higher values can impair correct timing, lower values do not provide sufficient protection. TR Qsec Vo VIN RDRIVER CVCC GND RSRSENSE SELREG DRIVER Qprim PRIMARY SIDE CONTROLLER Cout IC VCC SRSENSE aaa-000138 Fig 4. Application diagram high side rectification TR VIN Vo RSRSENSE PRIMARY SIDE CONTROLLER SRSENSE VCC Qprim Qsec RDRIVER Cout IC DRIVER SELREG GND aaa-000139 Fig 5. TEA1792ATS Objective data sheet Application diagram low side rectification All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 8 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 12. Package outline Plastic surface-mounted package (TSOP6); 6 leads D SOT457 E B y A HE 6 5 X v M A 4 Q pin 1 index A A1 c 1 2 3 Lp bp e w M B detail X 0 1 2 mm scale DIMENSIONS (mm are the original dimensions) UNIT A A1 bp c D E e HE Lp Q v w y mm 1.1 0.9 0.1 0.013 0.40 0.25 0.26 0.10 3.1 2.7 1.7 1.3 0.95 3.0 2.5 0.6 0.2 0.33 0.23 0.2 0.2 0.1 OUTLINE VERSION REFERENCES IEC JEDEC SOT457 Fig 6. JEITA SC-74 EUROPEAN PROJECTION ISSUE DATE 05-11-07 06-03-16 Package outline SOT457 (TSOP6) TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 9 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 13. Revision history Table 6. Revision history Document ID Release date Data sheet status Change notice Supersedes TEA1792ATS v.1 20120810 Objective data sheet - - TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 10 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 14. Legal information 14.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification. [1] Please consult the most recently issued document before initiating or completing a design. [2] The term ‘short data sheet’ is explained in section “Definitions”. [3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com. 14.2 Definitions Draft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet — A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. Product specification — The information and data provided in a Product data sheet shall define the specification of the product as agreed between NXP Semiconductors and its customer, unless NXP Semiconductors and customer have explicitly agreed otherwise in writing. In no event however, shall an agreement be valid in which the NXP Semiconductors product is deemed to offer functions and qualities beyond those described in the Product data sheet. 14.3 Disclaimers Limited warranty and liability — Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors. 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This document supersedes and replaces all information supplied prior to the publication hereof. TEA1792ATS Objective data sheet Suitability for use — NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. NXP Semiconductors and its suppliers accept no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk. Applications — Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customer(s). Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). NXP does not accept any liability in this respect. Limiting values — Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and conditions of commercial sale — NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NXP Semiconductors hereby expressly objects to applying the customer’s general terms and conditions with regard to the purchase of NXP Semiconductors products by customer. No offer to sell or license — Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 11 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NXP Semiconductors’ warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond NXP Semiconductors’ specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors’ standard warranty and NXP Semiconductors’ product specifications. 14.4 Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. GreenChip — is a trademark of NXP B.V. 15. Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] TEA1792ATS Objective data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 10 August 2012 © NXP B.V. 2012. All rights reserved. 12 of 13 TEA1792ATS NXP Semiconductors GreenChip synchronous rectifier controller 16. Contents 1 2 2.1 2.2 2.3 3 4 5 6 6.1 6.2 7 7.1 7.2 7.3 7.4 7.5 8 9 10 11 12 13 14 14.1 14.2 14.3 14.4 15 16 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1 Protection features . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 3 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional description . . . . . . . . . . . . . . . . . . . 4 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Start-up and UnderVoltage LockOut (UVLO) . . 4 Synchronous rectification . . . . . . . . . . . . . . . . . 4 Supply management. . . . . . . . . . . . . . . . . . . . . 5 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal characteristics . . . . . . . . . . . . . . . . . . 6 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application information. . . . . . . . . . . . . . . . . . . 8 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 10 Legal information. . . . . . . . . . . . . . . . . . . . . . . 11 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 11 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Contact information. . . . . . . . . . . . . . . . . . . . . 12 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. © NXP B.V. 2012. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] Date of release: 10 August 2012 Document identifier: TEA1792ATS