FA7703

FA7703/04 FA7703/7704 FUJI Power Supply Control IC DC/DC Power Supply control IC FA7703/7704 Application Note June-2010 Fuji Electric Systems Co.,Ltd. Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 1 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 WARNING 1. This Data Book contains the product specifications, characteristics, data, materials, and structures as of June 2010. The contents are subject to change without notice for specification changes or other reasons. When using a product listed in this Data Book, be sure to obtain the latest specifications. 2. All applications described in this Data Book exemplify the use of Fuji's products for your reference only. No right or license, either express or implied, under any patent, copyright, trade secret or other intellectual property right owned by Fuji Electric Co., Ltd. is (or shall be deemed) granted. Fuji makes no representation or warranty, whether express or implied, relating to the infringement or alleged infringement of other's intellectual property rights, which may arise from the use of the applications, described herein. 3. Although Fuji Electric is enhancing product quality and reliability, a small percentage of semiconductor products may become faulty. When using Fuji Electric semiconductor products in your equipment, you are requested to take adequate safety measures to prevent the equipment from causing a physical injury, fire, or other problem if any of the products become faulty. It is recommended to make your design fail-safe, flame retardant, and free of malfunction. 4.The products introduced in this Data Book are intended for use in the following electronic and electrical equipment, which has normal reliability requirements. • Computers • OA equipment • Communications equipment (terminal devices) • Measurement equipment • Machine tools • Audiovisual equipment • Electrical home appliances • Personal equipment • Industrial robots etc. 5.If you need to use a product in this Data Book for equipment requiring higher reliability than normal, such as for the equipment listed below, it is imperative to contact Fuji Electric to obtain prior approval. When using these products for such equipment, take adequate measures such as a backup system to prevent the equipment from malfunctioning even if a Fuji's product incorporated in the equipment becomes faulty. • Transportation equipment (mounted on cars and ships) • Trunk communications equipment • Traffic-signal control equipment • Gas leakage detectors with an auto-shut-off feature • Emergency equipment for responding to disasters and anti-burglary devices • Safety devices 6. Do not use products in this Data Book for the equipment requiring strict reliability such as (without limitation) • Space equipment • Aeronautic equipment • Atomic control equipment • Submarine repeater equipment • Medical equipment 7. Copyright © 1995 by Fuji Electric Co., Ltd. All rights reserved. No part of this Data Book may be reproduced in any form or by any means without the express permission of Fuji Electric. 8. If you have any question about any portion in this Data Book, ask Fuji Electric or its sales agents before using the product. Neither Fuji nor its agents shall be liable for any injury caused by any use of the products not in accordance with instructions set forth herein. Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 2 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 CONTENTS FA7703/7704 Page 1. Description ......................................................... 4 2. Features ............................................................. 4 3. Outline ................................................................ 4 4. Block diagram .................................................... 5 5. Selection Guide ................................................... 5 6. Pin assignment .................................................. 5 7. Ratings and characteristics ................................ 6 8. Characteristics curves.......................................... 9 9. Description of each circuit .................................. 13 10. Design advice .................................................... 16 11. Application circuit ............................................... 21 Note • Parts tolerance and characteristics are not defined in all application described in this Data book. When design an actual circuit for a product, you must determine parts tolerances and characteristics for safe and stable operation. Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 3 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 1. Description FA7703/04 are the PWM type DC-DC converter control ICs with 2ch output that can directly drive power MOSFETs. FA7703/04 feature CMOS devices with high breakdown voltage and also low power consumption are achieved. By means of their small and thin package (1.1mm max.), and high frequency operation (to 1MHz), FA7703/04 are completely suitable for the use of very small DC-DC converters. Besides, you can select a Pch or Nch type of MOSFET directly driven by FA7703/04, and also you can practically design any kind of DC-DC converter circuit like a boost converter, a buck converter, a inverting converter, a fly-back converter, and so on. 2. Features Wide range of supply voltage FA7703 : VCC=2.5 to 30V FA7704 : VCC=2.5 to 20V Direct driving of MOSFET Switching Pch/Nch driving is available (channel 1 only) Low current consumption is achieved by CMOS process: 1.8mA (typ.) in operation 2ch PWM control IC High frequency operation is available: 50kHz to 1MHz Simple setting of operation frequency with a timing resistor Soft start setting is available Setting of the limitation of maximum output duty cycle is available in each channel Built-in protection function for undervoltage lockout Highly accurate reference voltage: VREF: 1.00V±1%, VB: 1.00V±2%, VREG: 2.20V±2% Built-in output timer latched short-circuit protection circuit Thin and small package: TSSOP-16, SOP-16 3. Outline TSSOP-16 (V) 5.0 ±0.1 SOP-16 (M) 5.3 ± 0.3 4 . 40 ± 0. 05 6 .4 ± 0.1 10.2 ±0.3 1.9 ± 0.2 1.10MAX 1.27 0.4 ±0.05 0.65 7.8 ± 0.2 units:mm Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 4 http://www.fujielectric.co.jp/fdt/scd/ 0 . 71 ± 0 . 1 FA7703/04 4. Block diagram REG 16 DT1 15 REF 14 FA7703/7704 IN113 FB1 12 SEL1 11 OUT1 10 VCC 9 Er.Am p1 Reference voltage 2.2V 1V I CS + + + PW M.Com p1 O N/O FF 1.3V UVLO S.C.P BIAS 1.5V Power G ood Signal BIAS S.C.DET + - 2.0V Er.Am p2 + + + PW M.Com p2 O N/OFF FA7704 OSC 1 RT 2 CS 3 DT2 4 IN2+ 5 IN2- 6 FB2 7 GND 8 OUT2 5. Selection Gide FA7703 FA7704 Ch.1(OUT1) Ch.2(OUT2) Ch.1(OUT1) Ch.2(OUT2) Buck, Boost, Fly-back Buck, Inverting (Pch driven) Buck, Boost, Fly-back Boost, Fly-back (Nch driven) 6. Pin assignment Pin Pin No symbol 1 RT 2 CS 3 DT2 4 IN2+ 5 IN26 FB2 7 GND 8 OUT2 9 VCC 10 OUT1 11 SEL 12 FB1 13 IN114 REF 15 DT1 16 REG Description Oscillator timing resistor Soft start, Timer latched short circuit protection, ON/OFF control Ch.2 Dead Time Adjustment Ch.2 non-inverting input to error amplifier Ch.2 inverting input to error amplifier Ch.2 output o error amplifier Ground Ch.2 output Power supply Ch.1 output Selection of type of driven MOSFET (OUT1) Ch.1 output o error amplifier Ch.1 inverting input to error amplifier Reference voltage Ch.1 Dead Time Adjustment Regulated voltage output Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 5 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 7. Ratings and characteristics The contents are subject to change without notice. When using a product, be sure to obtain the latest specifications. (1)Absolute maximum ratings Item Symbol Ratings Units Power supply voltage FA7703 30 VCC V FA7704 20 REF Terminal output current IREF 1 mA REG Terminal output current IREG 2 mA OUT1, OUT2 Terminal source current ISOpeak -400(peak) mA -50(continuos) mA ISOcont OUT1, OUT2 Terminal sink current ISIpeak +150(peak) mA +50(continuos) mA ISIcont RT,CS,REG,REF,IN1-,IN2+,IN2-,FB1, +2.5(max.) VLOGIC V FB2,DT1,DT2,SEL1 Terminal voltage -0.3(min.) Power dissipation TSSOP 300 Pd mW SOP 400 (Ta≤25°C)* Operating ambient temperature Ta -30 to +85 °C Operating junction temperature Tj +125 °C Storage temperature Tstg -40 to +150 °C *:Maximum dissipation curve at Ta≥25°C is shown under figure. Maximum power dissipation curve Maximum power dissipation Pd[mW] 500 SOP 400 300 200 100 0 -30 0 30 60 90 120 150 Ambient temperature Ta[°C] TSSO (2)Recommended operating conditions Item Symbol MIN. TYP. MAX. Units Supply voltage FA7703 2.5 6 28 Vcc V FA7704 2.5 6 18 DC feedback resistor of 100 RNF kΩ error amplifier VCC terminal capacitance* CVCC 0.1 μF REG terminal capacitance CREG 0.047 0.1 1 μF CS terminal capacitance CCS 0.01 10 μF Oscillation frequency fOSC 50 1000 kHz SEL1 terminal Pch,PNP driving VSEL1L Connect to GND voltage Connect to REG terminal Nch,NPN driving VSEL1H *Please select the proper value by input-output conditions of power supply. Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 6 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 (3)Electrical characteristics [Unless otherwise standard,Ta=25°C,Vcc=6V,RT=22kΩ] (1) Internal Bias Section (REF terminal voltage) Item Symbol Conditions MIN. TYP. MAX. Output Voltage REF terminal load current 0.990 1.000 1.010 VREF IREF=0mA Line Regulation FA7703:Vcc=2.5 to 28V,IREF=0mA ±1 ±5 VLINEF FA7704:Vcc=2.5 to 18V,IREF=0mA Load Regulation VLDF IREF=0 to 1mA -10 -3 Variation Ta=-30 to +85°C -0.8 to VTCF with temperature Change rate for value at 25°C +0.2 (2) Regulated Voltage for Internal Control Blocks Section (REG terminal voltage) Item Symbol Conditions MIN. TYP. Output Voltage REG terminal load current 2.156 2.200 VREG IREG=0mA Line Regulation FA7703:Vcc=2.5 to 28V,IREG=0mA ±4 VLINEG FA7704:Vcc=2.5 to 18V,IREG=0mA Load Regulation VLDG IREG=0 to 2mA -12 -2 Variation Ta=-30 to +85°C -0.8 to VTCG with temperature Change rate for value at 25°C +0.2 (3) Oscillator Section Item Oscillation frequency Line Regulation Variation With temperature Units V mV mV % MAX. 2.244 ±14 Units V mV mV % Symbol fOSC f LINE fTC1 fTC2 Conditions RT=22kΩ FA7703:Vcc=2.5 to 28V FA7704:Vcc=2.5 to 18V Ta=+25 to -30°C, f=50k to 1MHz Ta=+25 to +85°C, f=50k to1MHz MIN. 160 TYP. 190 ±0.1 ±2 ±3 MAX. 220 Units kHz % % % (4) Error Amplifier Section (Input:IN1-,IN2+,IN2-,Output:FB1,FB2 terminal) Item Symbol Conditions MIN. Reference Voltage VB IN1- terminal threshold voltage 0.980 (ch1) Input offset (ch2) VOFST (IN2+) - (IN2-) Common mode input 0.3 VIN voltage Input Current IIN -100 Open Loop Gain AVO 70 Unity Gain Bandwidth fT Output Source Current FB1,2 -220 IOHE terminal voltage=VREF-0.5V Output sink Current IOLE FB1,2 terminal voltage=0.5V 3 (5) Pulse Width Modulation Section (FB1,FB2 terminal) Item Symbol Conditions Input threshold voltage VFB0 Duty Cycle=0% Input threshold voltage VFB100 Duty Cycle=100% (6) Dead Time Adjustment Circuit Section (DT1, DT2 terminal) Item Symbol Conditions Input threshold voltage VDT0 Duty Cycle=0% Input threshold voltage VDT100 Duty Cycle=100% TYP. 1.000 - MAX. 1.020 ±10 1.4 +100 Units V mV V nA dB MHz μA mA 0 1.5 -160 6 -100 12 MIN. 0.550 1.000 TYP. 0.650 1.100 MAX. 0.750 1.200 Units V V MIN. 0.550 1.000 TYP. 0.650 1.100 MAX. 0.750 1.200 Units V V Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 7 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 (7) Under Voltage Lock-Out Section (VCC terminal) Item Symbol Conditions ON threshold VCCON OFF threshold VCCOF Hysteresis Voltage VCCHY Variation Ta=-30 to +25°C VCCHY with temperature Ta=+25to +85°C (8) Soft Start Section (CS terminal) Item Symbol Conditions CS=0V Output source current ICS Threshold Voltage1 VCS0 Duty Cycle=0% Threshold Voltage2 VCS50 Duty Cycle=50% (9) Short circuit Protection Section (FB terminal, CS terminal) Item Symbol Conditions Short Detection FB terminal voltage VFBTH Threshold Voltage Latched Mode CS terminal voltage VCSTH Threshold Voltage Latched Mode CS terminal voltage VCSRE Reset Voltage Latched Mode CS terminal voltage VCSHY Hysteresis CS terminal VCSCL1 FB terminal voltage1.65V (10) Output Stage Section (OUT1,OUT2 terminal,SEL1 terminal) Item Symbol Conditions High side on resistance RONH VCC=6V,Source Current=-50mA High side on resistance RONH VCC=2.5V,Source Current=-50mA Low side on resistance RONL VCC=6V,Sink Current=+50mA Low side on resistance RONL VCC=2.5V,Sink Current=+50mA Rise Time trn 330pF Load to GND terminal trp 330pF Load to VCC terminal Fall Time tfn 330pF Load to GND terminal tfp 330pF Load to VCC terminal SEL1 terminal Input Pch-MOSFET, VSEL1L Voltage PNP transistor driving Nch-MOSFET, VSEL1H NPN transistor driving (11) Overall Section (VCC terminal) Item Symbol Conditions Operating mode Duty Cycle=0%,OUT1/2:open Supply Current ICC0 CS=0V, FB1,FB2≈VREG RT=22kΩ,f≈190kHz Duty Cycle=80%,OUT1/2:open ICC1 RT=22kΩ,f≈190kHz Duty Cycle=80%,OUT1/2:open ICC2 RT=3kΩ,f≈1MHz Latched mode CS>2.1V,FB1,FB2≈VREG, ICCLAT Supply Current RT=22kΩ,f≈190kHz MIN. 1.40 0.05 TYP. 2.00 1.85 0.15 +0.3 -0.1 MAX. 2.25 0.35 Units V V V mV/°C mV/°C MIN. -2.8 0.550 TYP. -2.2 0.650 0.880 MAX. -1.6 0.750 Units μA V V MIN. 1.350 1.900 TYP. 1.500 2.000 1.830 MAX. 1.650 2.100 Units V V V 30 1.200 2.120 170 1.270 2.200 300 1.340 2.280 mV V V MIN. TYP. 10 18 5 5 20 20 35 35 MAX. 20 36 10 10 0 VREG0.2 0.2 VREG Units Ω Ω Ω Ω ns ns ns ns V V MIN. TYP. 1.3 MAX. 1.9 Units mA 1.8 3.1 1.3 2.7 4.7 1.9 mA mA mA Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 8 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 8. Characteristics curves FA7703/7704 Timing resistor vs.Oscillation frequency 1000 Vcc=6V 195 194 Oscillation frequency vs.ambient temperature Vcc=6V,RT=22k Ω Oscillation frequency [kHz] Oscillation frequency [kHz] 193 192 191 190 189 188 187 186 100 10 1 10 Timing resistor RT[k Ω] 100 185 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 Regulated voltage vs.Supply voltage VCC 2.22 IREG=0A,RT=22k Ω 2.24 2.23 Regulated voltage vs.Ambient temperature IREG=0A,RT=22k Ω Regulated voltage VREG[V] 2.21 Regulated voltage VREG[V] 2.22 2.21 2.20 2.19 2.18 2.17 2.20 2.19 2.18 0 5 10 Supply voltage Vcc[V] 15 20 2.16 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 Reference voltage vs.Supply voltage VCC 1.010 IREF=0A,RT=22k Ω 1.02 Reference voltage vs.Ambient temperature IREF=0A,RT=22k Ω Reference voltage VREF[V] 1.005 Reference voltage VREF[V] 1.01 1.000 1.00 0.995 0.99 0.990 0 5 10 Supply voltage Vcc[V] 15 20 0.98 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 9 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 FB terminal voltage vs.Duty cycle 100 90 80 70 Duty cycle [%] 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 FB terminal voltage [V] fosc=190kHz Duty cycle [%] fosc=1MHz FA7703/04:OUT1 Nch driven (SEL1=REG) FA7704:OUT2 FB terminal voltage vs.Duty cycle 100 90 80 70 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 FB terminal voltage [V] fosc=190kHz fosc=1MHz FA7703/04:OUT1 Pch driven (SEL1=GND) FA7703:OUT2 DT terminal voltage vs.Duty cycle 100 90 80 70 Duty cycle [%] Duty cycle [%] FA7703/04:OUT1 Nch driven (SEL1=REG) FA7704:OUT2 DT terminal voltage vs.Duty cycle 100 90 FA7703/04:OUT1 Pch driven (SEL1=GND) FA7703:OUT2 fosc=1MHz 80 70 60 50 40 30 20 10 0 fosc=190kHz fosc=1MHz 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 DT terminal voltage [V] fosc=190kHz 0.5 0.6 0.7 0.8 0.9 1.0 DT terminal voltage [V] 1.1 1.2 CS terminal voltage vs.Duty cycle 100 90 80 70 Duty cycle [%] 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1.0 CS terminal voltage [V] 1.1 1.2 fosc=190kHz fosc=1MHz Duty cycle [%] FA7703/04:OUT1 Nch driven (SEL1=REG) FA7704:OUT2 CS terminal voltage vs.Duty cycle 100 90 80 70 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1.0 CS terminal voltage [V] 1.1 1.2 fosc=190kHz fosc=1MHz FA7703/04:OUT1 Pch drivenb (SEL1=GND) FA7703:OUT2 Fuji Electric Systems Co., Ltd. AN-057E Rev.1.0 Jun-2010 10 http://www.fujielectric.co.jp/fdt/scd/ FA7703/04 FA7703/7704 Duty cycle vs. Ambient temperature 94 92 90 duty cycle [%] 88 86 84 fosc=1MHz 82 80 78 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 fosc=190kHz duty cycle [%] FA7703/04:OUT1 Nch drive (SEL1=REG) FA7704:OUT2 Duty cycle vs. Ambient temperature 94 92 90 88 86 84 82 80 78 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 fosc=1MHz FA7703/04:OUT1 Pch drive (SEL1=GND) FA7703:OUT2 DT terminal voltage≈1.05V DT terminal voltage≈1.05V fosc=190kHz Operating mode supply current vs.Supply voltage 3.0 Operating mode supply current [mA] 2.5 CS terminal voltage [V] Duty=80%, IN(-)-FB:shorted CS terminal voltage vs.Ambient temperature 1.33 1.31 1.29 1.27 1.25 1.23 1.21 -40 -20 0 20 40 60 Ambient temperature Ta[°C] 80 100 FB1,FB2