TN7D51 Ordering number : ENA0866 SANYO Semiconductors DATA SHEET ExPD (Excellent-Performance Power & RF Device) TN7D51 Separately-Excited Step-Down Switching Regulator (12V Output type) Features • • • • • • High efficiency (ON resistance 80mΩ). Over current protection function (Self recovery type). Under voltage protection function. Over temperature protection function (Self recovery type). Soft start function (Variable subject to externally-connected capacitor). Stand-by mode function (Compatible with soft start terminal). Specifications Absolute Maximum Ratings at Ta=25°C Parameter Symbol Conditions Ratings Unit Maximum Input Voltage VIN max 57 Maximum Output Current IO max 7 V A SW Pin Application Reverse Voltage VSW --1.5 V FB Pin Maximum Input Voltage Vfb VSS 15 V SS Pin Maximum Input Voltage Allowable Power Dissipation PD Operating Temperature Topr Junction Temperature Tj Storage Temperature Tstg Tc=25°C 7 V 2.0 W 20 W --25 to +125 °C 150 °C --55 to +150 °C Recommend Operating Conditions Parameter Input Voltage Output Current Operating Temperature Range Symbol Conditions Ratings Unit VIN Ta=25°C 20 to 48 IOUT Ta=25°C 0 to 7 A --10 to +85 °C Topr rec V Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 82907IQ TI IM TC-00000851 No. A0866-1/11 TN7D51 Electrical Characteristics at Ta=25°C, See Specified Test Circuit Parameter Symbol Output Voltage VOUT Conditions η VIN=30V, IOUT=3A VIN=30V, IOUT=3A Switching Frequency RDS(on) Freq ISW=7A VIN=30V, IOUT=3A Maximum Duty Duty max VIN=30V, Vfb=0V Line Regulation ∆Vline VIN=20 to 40V, IOUT=3A ∆Vload Efficiency Drain-to-Source On Resistance Load Regulation Output Voltage Temperature Coefficient *1 Under-Voltage-Protection-Operation -Threshold Voltage Under-Voltage-Protection-Operation Release Voltage Under-Voltage-Protection Hysteresis Voltage Over-Temperature-Protection-Operation -Threshold-Current *1 Over-Temperature-Protection-Operation Release Temperature *1 Over-Temperature-Protection Hysteresis Temperature *1 SS Terminal Current Standby Current 12.0 12.4 92 80 120 mΩ 180 kHz 96 % mV VIN=30V, IOUT=0.7 to 7A 100 200 VIN=30V, IOUT=3A, Ta= --25 to +125°C ±1.2 mV / °C 7.1 10.5 A Vuvlo on 7.2 8.0 8.8 V Vuvlo off 8.1 9.0 9.9 V VIN=30V 88 150 V % 360 mV Vuvlo hys 1.0 V Ttsd on 165 °C Ttsd off 140 °C Ttsd hys 25 °C 10 µA ISS Vstb on Standby Operating Voltage 11.7 Unit max 92 Iocp -Threshold Current typ 180 ∆VO / ∆Ta Over-Current-Protection-Operation Ratings min Istb VIN=30V VIN=30V VIN=30V, VSS=0V 0.3 V 500 µA Note: the values with "*1" are our targeted values, but not guaranteed. Package Dimensions unit : mm (typ) 7527-001 10.0 4.5 3.2 1.6 16.0 7.2 3.5 2.8 1 2 3 4 (5.9) 0.9 0.5 12.5 14.0 2.4 5 1.27 0.7 3.81 2.54 1.27 2.54 2.75 1 : VIN 2 : GND 3 : SWOUT 4 : FB 5 : SS SANYO : TO-220FI5H-HB No. A0866-2/11 TN7D51 Block Diagram VIN 1 3 SWOUT Low Voltage Protect Thermal Shut Down Protect Over Current Protect SENSE Pch MOSFET OUTPUT -COMP + OSC SS 5 SOFTSTART Band Gap + AMP -- 4 FB GND 2 Pin Functions Pin No. Symbol 1 VIN Power Supply Input (Maximum 57V) Function 2 GND GND 3 SWOUT 4 FB Feedback from Output Voltage 5 SS For Soft Start Capacitor Connection and Standby Mode Switching Pulse Voltage Output Application Circuit Example 1 VIN SWOUT 3 VOUT VIN 5 SS + FB 4 + 2 GND GND GND No. A0866-3/11 TN7D51 PD -- Ta 2.0 No 1.5 he at sin PD -- Tc 25 Allowable Power Dissipation, PD -- W Allowable Power Dissipation, PD -- W 2.5 k 1.0 0.5 0 20 15 10 5 0 0 20 40 60 80 100 120 140 Ambient Temperature, Ta -- °C 0 160 20 40 60 80 100 120 Case Temperature, Tc -- °C IT12620 140 160 IT12671 Specified Circuit for Electrical Characteristics [Circuit] L1 IC1 VIN VOUT R3 1 2 3 4 5 + C1 + C3 GND D1 C2 C6 GND IT12637 [Components] Symbol Component Specification C1 Electrolytic Capacitor 3000 to 3600µF C2 Electrolytic Capacitor 2000 to 2200µF C3 Capacitor 0.1µF C6 Ceramic Capacitor 1000pF R3 Metal Oxide Film Resistor 47Ω / 2W L1 Choke Coil 100µH D1 Schottky Barrier Diode SBT250-06J * When measuring ripple noise voltage, put 47µF (electrolytic capacitor) and 0.1µF (ceramic or film capacitor) into measuring point. No. A0866-4/11 TN7D51 Evaluation Board [Circuit] L1 F1 VIN IC1 FUSE R3 C4 R1 VOUT 1 2 3 4 5 C1A + C1B + C1C + C2A + C3 D1 C6 C5 R2 GND GND IT12638 [Components] Symbol F1 Component Specification Maker Remark Fuse 4A Littelfuse 452 004 C1A Electrolytic Capacitor 1200µF / 80V Nippon Chemi-Con Corp. KZE C1B Electrolytic Capacitor 1200µF / 80V Nippon Chemi-Con Corp. KZE C1C Electrolytic Capacitor 1200µF / 80V Nippon Chemi-Con Corp. KZE C2A Electrolytic Capacitor 2200µF / 35V Nippon Chemi-Con Corp. KMG C3 Film Capacitor 0.1µF / 100V Matsushita Electronic Components Corp. ECQ-B C4 N.C. 1000pF Murata Manufacturing Co., Ltd Matsushita Electronic Components Corp. C5 N.C. C6 Ceramic Capacitor R1 Jumper Line R2 N.C. R3 Metal Oxide Film Resistor 47Ω / 2W L1 Choke Coil HK-12S120-1010 TOHO ZINC CO.,LTD D1 Schottky Barrier Diode SBT250-06J SANYO Semiconductor Co., Ltd 100µH No. A0866-5/11 TN7D51 Recommended PWB Pattern TO-220FI5H-HB Specification Silk Printing (Top View) TO-220FI5H-HB Specification Pattern (Perspective View) No. A0866-6/11 TN7D51 Output Voltage -- Output Current Efficiency -- Output Current 100 12.3 VIN=20V 12.1 Efficiency -- % Output Voltage -- V 12.2 VIN=40V 30V 12.0 20V 40V 90 30V 80 11.9 70 11.8 0 1 2 3 4 5 6 Output Current -- A 0 7 2 3 4 5 6 Output Current -- A Characteristic of Output Current Protection 7 IT12673 Output Voltage -- Input Voltage 12.2 14 VIN=40V 12 20V 12.1 10 Output Voltage -- V Output Voltage -- V 1 IT12672 8 6 4 A =3 T U IO 12.0 7A 11.9 11.8 2 0 11.7 0 2 4 6 8 10 12 Output Current -- A 0 14 20 Power Loss -- W Input Current -- A 5 T =7 A 3 2 50 IT12675 =7A I OUT 8 IO U 40 Power Loss -- Input Voltage 10 6 4 30 Input Voltage -- V Input Current -- Input Voltage 7 10 IT12674 6 4 3A 3A 2 1 0 0 0 10 20 30 40 Input Voltage -- V 50 0 10 20 30 Output Voltage -- Tc 180 12.3 VIN=30V Oscillation Frequency -- kHz Output Voltage -- V IO UT= 3A 12.1 12.0 50 IT12677 Oscillation Frequency -- Tc VIN=30V 12.2 40 Input Voltage -- V IT12676 170 160 3A I OUT= 150 140 130 11.9 --25 0 25 50 Case Temperature, Tc -- °C 75 100 IT12678 120 --25 0 25 50 Case Temperature, Tc -- °C 75 100 IT12679 No. A0866-7/11 TN7D51 Input Reduced-Voltage Characteristic 14 Output Voltage -- V 13 IOUT=3A 12 7A 11 10 9 0 10 20 30 Input Voltage -- V 40 IT12680 Output Voltage Rising Characteristic IOUT=3A Output Voltage Falling Characteristic Input voltage: VIN=30V 5V / div 20ms Output voltage: VOUT=12V ON Input / Output Voltage -- V 5V / div Input / Output Voltage -- V IOUT=3A Input voltage: VIN=30V 20ms Output voltage: VOUT=12V IT12681 IT12682 Output Voltage Rising Characteristic IOUT=7A Output voltage: VOUT=12V ON Input / Output Voltage -- V 5V / div 20ms Capacitance of Soft Start Capacitor -Output Voltage Rising Characteristic IT12683 20ms Output voltage: VOUT=12V Capacitance of Soft Start Capacitor -Output Voltage Rising Characteristic I =3A Output voltage: VOUT=12V OUT 2V / div IT12684 I =7A Output voltage: VOUT=12V OUT 2V / div 10ms Input / Output Voltage -- V 10ms Input / Output Voltage -- V IOUT=7A Input voltage: VIN=30V Input voltage: VIN=30V 5V / div Input / Output Voltage -- V Output Voltage Falling Characteristic C=0.01µF C=0.1µF C=0.22µF ON IT12685 C=0.01µF C=0.1µF C=0.22µF ON IT12686 No. A0866-8/11 TN7D51 Example of Over-voltage Protection Circuit. Generally, in constant-voltage power supply circuit, output voltage will become higher than the specified value (overvoltage state) in case of any failures or PC board solderability defects. To minimize the damage caused by this over voltage, we recommend setting an over-voltage protection circuit. In designing, the following confirmations are necessary in actual circuit. 1) How the over-voltage protection circuit operates and its effects. 2) Is there any malfunction due to ambient temperature change of each device or exogenous noises? Over-voltage Protection Circuit Example F1 VIN Constant-voltage power supply FUSE VOUT ZD THYRISTOR C R GND GND IT12639 Example of Over-voltage Protection Circuit The thyristor will operate when it accept an over-voltage (VOUT) signal, then the fuse is melted and the input power is cut off, then the operation of IC1 is stopped. F1 VIN IC1 FUSE VOUT THYRISTOR 1 2 3 4 5 + + C GND ZD R GND IT12640 Continued on next page. No. A0866-9/11 TN7D51 Continued from preceding page. SS terminal (5 pin) also acts as standby mode switch. By setting SS terminal (5 pin) voltage to be equal or less than 0.3Vtyp, the output ON/OFF is able to be controlled by external signals. ON/OFF Control Circuit Example F1 VIN IC1 FUSE VOUT 1 2 3 4 5 + + NPN GND Signal GND IT12641 In addition, confirmation of the following points is necessary in actual circuit. 1) How the output ON/OFF control operates and its effects. 2) Is there any malfunction due to the ambient temperature change of each device or exogenous noises? Points to Remember in Pattern Designing 1) Transient large current flows to VIN terminal (1 pin), so we recommend the input capacitor should be 3000µF and above. In addition, (+) (-) terminals of the input capacitor should be set near to VIN terminal (1 pin) and GND terminal (2 pin). 2) Large current flows to C1A to C, VIN terminal (1 pin) of IC1, SWOUT terminal (3 pin), D1, L1, and C2A. So, the wiring should be thick and short. 3) FB terminal (4 pin) of IC1 is the feedback terminal from output voltage. It should be near to the output capacitor C2A. • For the purpose of ensuring the stability of oscillation, a capacitor should be inserted between SS terminal (5 pin) and GND terminal (2 pin). • The absolute maximum rated voltage of SS terminal (5 pin) is 7V. The absolute maximum rated voltage of FB terminal (4 pin) is within the range of 5 to 30V according to the output voltage type. When a voltage equal or higher than the rated value is applied to SS terminal (5 pin) or FB terminal (4 pin) in some cases such as abnormal test, protection measures like inserting fuses should be taken. • The built-in over-heat protection is a function to prevent the circuit from overheat state caused by transient temperature rise, but not a function to prevent from abnormal caused by a sudden heat generation. In addition, the reliability of over-heat protection function is not guarantee. No. A0866-10/11 TN7D51 SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of August, 2007. Specifications and information herein are subject to change without notice. PS No. A0866-11/11