Features
Document overview
- Manufacturer or author: gigabyte
- PDF pages: 8
Technical content
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated OBSOLETE – PART DISCONTINUED Lead-free 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 SOP-8L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) 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
13 : Tape & Reel G : Green S : SOP-8L L : Lead Free Device Package Code Packaging (Note 2) 13” Tape and Reel Quantity Part Number Suffix AP2008SL-13 S SOP-8L 2500/Tape & Reel -13 AP2008SG-13 S SOP-8L 2500/Tape & Reel -13 Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemp tions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be foun d on our website at http://www.diodes.com/datasheets/ap02001.pdf. Features General Description PART OBSOLETE - NO ALTERNATE PART
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Pin Assignments OUT SSCOMP SCP VCC GND CT FB ( Top View ) SOP-8L Pin Descriptions Pin Name Description OUT PWM Output VCC Supply Voltage COMP Feedback Loop Compensation FB Voltage Feedback SCP Short Circuit Protection SS Soft-Start. CT Timing Capacitor GND Ground
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Block Diagram Bandgap Reference OUT PWM Amplifier FB VCC SCP CT Error Amplifier COMP UVLO GND 0.7V 1.5V + 2.5V Internal use0.77V Iss VCC Oscillator 10K-300KHz / CT value SS Absolute Maximum Ratings Symbol Parameter Rating Unit VCC Supply voltage 22 V VI Amplifier input voltage 20 V VO Collector output voltage VCC-1.0V V ISOURCE Source current 200 mA ISINK Sink current 200 mA TOP Operating temperature range -20 to +85 oC TST Storage temperature range -65 to +150 oC Recommended Operating Conditions Symbol Parameter Min Max Unit VCC Supply voltage 3.6 20 V VI Amplifier input voltage 1.05 1.45 V VO Collector output voltage Vcc-1.5 V IFB Current into feedback terminal 45 µA RF Feedback resistor 100 kΩ CT Timing capacitor 100 6800 pF FOSC Oscillator frequency 10 300 KHz
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Electrical Characteristics (TA=25ºC, VCC=6V, f=200 Khz) Reference (REF) Symbol Parameter Conditions Min Typ. Max Unit VREF Comp connect to FB 0.755 0.770 0.785 V Output voltage change with temperature TA = 25ºC ~ 85ºC -0.2 ±1 % Under voltage lockout (UVLO) Symbol Parameter Conditions Min Typ. Max Unit VUT Upper threshold voltage (VCC) IO(REF) = 0.1mA TA = 25ºC 2.9 V VLWT Lower threshold voltage (VCC) 2.4 V VHT Hysteresis (VCC) 500 mV Short-circuit protection (SCP) control Symbol Parameter Conditions Min Typ. Max Unit VIT Input threshold voltage TA = 25ºC 0.60 0.67 0.75 V VSTB Standby voltage No pull up 100 130 160 mV VLT Latched input voltage No pull up 50 100 mV ISCP Input (source) current VI = 0.7V, TA = 25ºC -10 -15 -20 µA VCT Comparator threshold voltage (COMP) 1.5 V Oscillator (OSC) Symbol Parameter Conditions Min Typ. Max Unit FOSC Frequency CT =270 pF 200 KHz ΔFOSC Standard deviation of frequency CT =270 pF 10 % Frequency change with voltage VCC=3.6V ~ 20V 1 Error-amplifier Symbol Parameter Conditions Min Typ. Max Unit VIO Input offset voltage VO (FB)=0.77V ±6 mV IIO Input offset current VO (FB)=0.77V ±100 nA IIB Input bias current VO (FB)=0.77V 160 500 nA VCM Common-mode input voltage range VCC=3.6V ~ 20V 1.05 1.45 V AV Open-loop voltage amplification RF=200 kΩ 70 80 dB GBW Unity-gain bandwidth 1.5 MHz CMRR Common-mode rejection ratio 60 80 dB VOH Max. output voltage Vref-0.1 V VOL Min. output voltage 1 V IOI Output (sink) current (COMP) VID = -0.1V, VO = 0.77V 0.5 1.6 mA IOO Output (source) current (COMP) VID = 0.1V, VO = 0.77V -45 -70 µA
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Electrical Characteristics (Continued) (TA=25ºC, VCC=6V, f=200 Khz) Output section Symbol Parameter Conditions Min Typ. Max Unit ILEAK Leakage current VO = 20V 10 µA IDRV Sink current VIN= 12V 200 mA Source current VIN= 12V 200 mA VSAT Output saturation voltage IO = 10 mA 1.0 1.5 V ISC Short-circuit output current VO = 6V 120 mA PWM comparator Symbol Parameter Conditions Min Typ. Max Unit VT0 Input threshold voltage at f = 10 KHz (COMP) CT=6800pF 0.6 0.7 V VT100 Maximum duty cycle 1.2 1.3 V Total device Symbol Parameter Conditions Min Typ. Max Unit ICCA Average supply current CT = 270pF 6 10 mA Soft Start Symbol Parameter Conditions Min Typ. Max Unit VSS Soft-start Voltage 2.3 V ISS Constant Charge Current 20 µA Typical Application Circuit 10uH 470uF Output Step-Down DC/DC conv erter 10nF (Optional) Vcc = 12V P mos 5 4 OUT FB VCC COMP GND SCP SS CT C6 220nF C5 50nF C4 270pF 470uF R3 30K 50nF (Optional) 1V/5A
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Typical Characteristics REFERENCE OUTPUT VOLTAGE vs. POWER-SUPPLY VOLTAGE 0.755 0.76 0.765 0.77 0.775 0.78 0.785 4 6 8 10 12 14 16 18 20 Vcc-Power Supply Voltage (V) Vref- Reference Output Voltage (V) AVERAGE SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 0 4 8 12 16 20 Vcc - Power-Supply Voltgae (V) Icc-Average Supply Current (mA) AVERAGE SUPPLY CURRENT vs. AMBIENT TEMPERATURE -50 -25 0 25 50 75 100 TA - Ambient Temperature (℃) ICC - Average Supply Current (mA) VCT vs. FREQUENCY 0.2 0.4 0.6 0.8 1.2 1.4 1.6 0 100 200 300 Frequency (KHz) VCT (V) VCT(min) VCT(max) OSCILLATOR FREQUENCY vs. TIMING CAPACITANCE 100 150 200 250 300 350 100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600 CT-Timing Capacitor (pF) fosc - Frequency (KHz) SCP TIME-OUT PERIOD vs. SCP CAPACITANCE 45 90 135 180 225 270 315 360 405 450 495 Cscp - SCP Capacitance (nF) tscp-SCP Time-out Period (ms)
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Typical Characteristics (Continued) SOFT-START TIME (Ts) vs. SOFT-START CAPACITOR (Css) 25 50 75 100 125 150 175 200 Css (nF) Ts (mS) (1) SOP-8L ( Top View ) AP2008 YY WW X X Logo Part Number WW : Week : 01~52; 52 YY : Year : 08, 09,10~ G : Green X : Internal Code represents 52 and 53 week L : Lead Free Marking Information
Document number: DS31047 Rev. 3 - 4 www.diodes.com © Diodes Incorporated Package Information (All Dimensions in mm) (1) Package Type: SOP- 8L 1.27typ 0.3/0.5 7°~ 9° 4.85/4.95 3.85/3.95 5.90/6.10 0.15/0.25 7°~ 9° 0.62/0.82 0.10/0.20 Gauge Plane 0.254 Se ating Plane 0.35max.45° De tail "A" De tail "A" 1.30/1.50 1.75max. Land Patte rn Re comme ndation (Unit: mm) 6x- 1.27 8x- 1.55 8x- 0.60 5.4 0°/8° IMPORTANT NOTICE LIFE SUPPORT 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. 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.