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| AP2008 PWM BUCK CONTROLLER Features * * * * * * * * * * PWM Buck Control Circuitry Operating voltage can be up to 20V Under voltage Lockout (UVLO) Protection Short Circuit Protection (SCP) Soft-start circuit Variable Oscillator Frequency -- 300Khz Max 0.77V voltage reference Output 8-pin SOP package Lead Free Finish/ RoHS Compliant for Lead Free and "Green" products (Note 1) SOP-8L: Available in "Green" Molding Compound (No Br, Sb) General Description The AP2008 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions include an on-chip 0.77V reference output, an error amplifier, an adjustable oscillator, a soft-start, UVLO, SCP circuitry, and a push-pull output circuit. Switching frequency is adjustable by trimming CT. During low VCC situation, the UVLO makes sure that the outputs are off until the internal circuit is operational normally. Applications * * * * Backlight inverter LCD Monitor XDROM, XDSL Product DC/DC converters in computers, etc. Ordering Information AP2008 X X X Package S: SOP-8L Lead-Free L : Lead Free G : Green Packing -U : Tube -13 : Taping 13" Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 Device (Note 2) AP2008S Package Packaging Code S SOP-8L Tube or Bulk Part Number Quantity Suffix 100 -U Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP2008 Rev. 2 1 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Pin Assignments ( Top View ) OUT VCC COMP FB 1 2 3 4 Pin Descriptions . Name 8 Description PWM Output Supply Voltage Feedback Loop Compensation Voltage Feedback Short Circuit Protection Soft-Start. Timing Capacitor Ground AP2008 7 6 5 GND CT SS SCP OUT VCC COMP FB SCP SS CT GND SOP Block Diagram VCC SS CT 10K-300KHz / CT value 0.77V Bandgap Reference 2.5V Internal use UVLO Oscillator VCC Iss PWM Amplifier FB + + Error Amplifier COMP 1.5V + 0.7V + OUT SCP GND AP2008 Rev. 2 2 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Absolute Maximum Ratings Symbol VCC VI VO ISOURCE ISINK TOP TST Supply voltage Amplifier input voltage Collector output voltage Source current Sink current Operating temperature range Storage temperature range Parameter Rating 22 20 VCC-1.0V 200 200 -20 to +85 -65 to +150 Unit V V V mA mA o o C C Recommended Operating Conditions Symbol VCC VI VO IFB RF CT FOSC TOP Supply voltage Amplifier input voltage Collector output voltage Current into feedback terminal Feedback resistor Timing capacitor Oscillator frequency Operating free-air temperature 100 100 10 -20 6800 300 85 Parameter Min. 3.6 1.05 Max. 20 1.45 Vcc-1.5 45 Unit V V V A k pF KHz C AP2008 Rev. 2 3 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Electrical Characteristics (T =25C, V A CC =6V, f=200 Khz) Reference (REF) Symbol Parameter Comp connect to FB VREF Output voltage change with temperature Under voltage lockout (UVLO) Symbol Parameter VUT Upper threshold voltage (VCC) VLWT Lower threshold voltage (VCC) VHT Hysteresis (VCC) Short-circuit protection (SCP) control Symbol Parameter VIT Input threshold voltage VSTB Standby voltage VLT Latched input voltage ISCP Input (source) current Comparator threshold voltage VCT (COMP) Oscillator (OSC) Symbol Parameter FOSC Frequency Standard deviation of frequency FOSC Frequency change with voltage Error-amplifier Symbol Parameter VIO Input offset voltage IIO Input offset current IIB Input bias current Common-mode input voltage VCM range Open-loop voltage AV amplification GBW Unity-gain bandwidth CMRR Common-mode rejection ratio VOH Max. output voltage VOL Min. output voltage IOI Output (sink) current (COMP) Output (source) current IOO (COMP) Conditions TA = -20C ~ 25C TA = 25C ~ 85C Conditions IO(REF) = 0.1mA TA = 25C Min. 0.755 Typ. 0.770 -0.1 -0.2 Typ. 2.9 2.4 500 Typ. 0.67 130 50 -15 1.5 Max. 0.785 1 1 Max. Unit V % % Unit V V mV Unit V mV mV A V Min. Conditions TA = 25C No pull up No pull up VI = 0.7V, TA = 25C Min. 0.60 100 -10 Max. 0.75 160 100 -20 Conditions CT =270 pF CT =270 pF VCC=3.6V ~ 20V Conditions VO (FB)=0.77V VO (FB)=0.77V VO (FB)=0.77V VCC=3.6V ~ 20V RF=200 k Min. Typ. 200 10 1 Typ. Max. Unit KHz % Min. 160 1.05 70 60 Vref-0.1 80 1.5 80 Max. 6 100 500 1.45 Unit mV nA nA V dB MHz dB V V mA A 1 VID = -0.1V, VO = 0.77V VID = 0.1V, VO = 0.77V 0.5 -45 1.6 -70 AP2008 Rev. 2 4 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Electrical Characteristics (Continued) (T =25C, V A CC =6V, f=200 Khz) Output section Symbol ILEAK IDRV VSAT Parameter Leakage current Sink current Source current Output saturation voltage Conditions VO = 20V VIN= 12V VIN= 12V IO = 10 mA VO = 6V Conditions CT=6800pF Maximum duty cycle Conditions CT = 270pF Conditions Min. Typ. 200 200 1.0 120 Max. 10 Unit A mA mA 1.5 V mA ISC Short-circuit output current PWM comparator Symbol Parameter VT0 VT100 Total device Symbol ICCA Soft Start Symbol VSS ISS Input threshold voltage at f = 10 KHz (COMP) Parameter Average supply current Parameter Soft-start Voltage Constant Charge Current Min. 1.2 Min. Typ. 0.6 1.3 Typ. 6 Max. 0.7 Unit V V Max. 10 Max. Unit mA Unit V A Min. Typ. 2.3 20 Typical Application Circuit R3 30K C2 10nF (Optional) 1 OUT GND 8 2 VCC CT 7 3 COMP SS 6 FB SCP 5 C4 270pF C5 50nF C6 220nF 4 Vcc = 12V Q1 P mos C1 470uF L1 10uH R1 1K R2 4K Output C4 50nF (Optional) 1V/5A 5A C3 470uF Step-Down DC/DC converter AP2008 Rev. 2 5 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Typical Characteristics REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE 0.785 0.78 0.775 0.77 0.765 0.76 0.755 AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 5 Icc-Average Supply Current (mA) VrefReference Output Voltage (V) 4 3 2 1 0 0 4 8 12 16 20 4 6 8 10 12 14 16 18 20 Vcc-Power Supply Voltage (V) Vcc - Power-Supply Voltgae (V) VCT(min) VCT(max) AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE 7 6 5 4 3 2 -50 -25 0 25 50 75 100 VCT vs. FREQUENCY 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 100 200 ICC - Average Supply Current (mA) VCT (V) 300 TA - Ambient Temperature () Frequency (KHz) 350 OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE tscp-SCP Time-out Period (ms) fosc - Frequency (KHz) 300 250 200 150 100 50 0 100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600 35 30 25 20 15 10 5 0 45 SCP TIME-OUT PERIOD vs. SCP CAPACITANCE 90 135 180 225 270 315 360 405 450 495 CT-Timing Capacitor (pF) Cscp - SCP Capacitance (nF) AP2008 Rev. 2 6 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Typical Characteristics (Continued) 30 25 SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css) Ts (mS) 20 15 10 5 0 25 50 75 100 125 150 175 200 Css (nF) Marking Information (1) SOP-8L (Top view) 8 5 Part Number AP2008 YY WW X X 1 4 Logo L : Lead Free G : Green Internal code Xth week: 01~52 Year: "01" =2001 "02" =2002 ~ AP2008 Rev. 2 7 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated AP2008 PWM BUCK CONTROLLER Package Information ( unit in mm ) SOP-8L 3.70/4.10 5.79/6.20 0.08/0.25 0.254 0.38/1.27 Detail "A" 0.35max. 45 Gauge Plane Seating Plane 7~9 7~9 1.30/1.50 1.75max. 0.20typ Detail "A" 1.27typ 4.80/5.30 0.3/0.5 3.70/4.10 IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP2008 Rev. 2 8 of 8 www.diodes.com DECEMBER 2006 (c) Diodes Incorporated |
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