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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 PDIP and SOP packages General Description The AP2008 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions included an on-chip 0.77V reference output, an error amplifier, an adjusted oscillator, a soft-start, UVLO, SCP circuitry, and a push-pull output circuit. Switching frequency can be 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. Pin Assignment ( Top View ) OUT VCC COMP FB 1 2 3 4 8 7 6 5 Pin Descriptions Name GND CT SS SCP Description Timing Capacitor Voltage Feedback Soft-Start. Feedback Loop Compensation PWM Output Ground Supply Voltage Short Circuit Protection CT FB SS COMP OUT GND VCC SCP PDIP/SOP Ordering Information AP2008 X Package N: PDIP-8L S: SOP-8L X X Lead Free Packing Blank : Tube Blank : Normal L : Lead Free Package A : Taping This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 1.0 Oct 11, 2004 1/8 AP2008 PWM Buck Controller 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 Absolute Maximum Ratings Symbol VCC VI VO ISOURCE ISINK TOP TST TLEAD Supply voltage Amplifier input voltage Collector output voltage Source current Sink current Operating temperature range Storage temperature range Lead temperature 1.6 mm(1/16 inch) from case for 10 seconds Parameter Rating 22 20 VCC-1.0V 200 200 -20 to +85 -65 to +150 260 Unit V V V mA mA o o o C C C Anachip Corp. www.anachip.com.tw 2/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller 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 =6V, f=200 KHz) Parameter Min. 3.6 1.05 Max. 20 1.45 Vcc-1.5 45 Unit V V V A k pF KHz C 100 100 10 -20 6800 300 85 Electrical Characteristics (T =25C, V A CC 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 Conditions TA = -20C ~ 25C TA = 25C ~ 85C Conditions IO(REF) = 0.1mA TA = 25C Conditions TA = 25C No pull up No pull up VI = 0.7V, 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. Min. 0.60 100 -10 Max. 0.75 160 100 -20 Conditions CT =270 pF CT =270 pF VCC=3.6V ~ 20V Min. Typ. 200 10 1 Max. Unit KHz % Anachip Corp. www.anachip.com.tw 3/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller Electrical Characteristics (Continued) (T =25C, V A CC =6V, f=200 KHz) 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) Output section Symbol Parameter ILEAK IDRV VSAT Leakage current Sink current Source current Output saturation voltage Conditions VO (FB)=0.77V VO (FB)=0.77V VO (FB)=0.77V VCC=3.6V ~ 20V RF=200 k Min. Typ. 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 Conditions VO = 20V VIN= 12V VIN= 12V IO = 10 mA VO = 6V Conditions CT=6800pF Maximum duty cycle Conditions CT = 270pF Conditions Min. 1.2 Min. Min. 200 200 1.0 120 Typ. 0.6 1.3 Typ. 6 Typ. 2.3 20 Max. 10 Max. Max. 0.7 1.5 0.5 -45 Min. 1.6 -70 Typ. Max. 10 Unit A mA mA V mA Unit V V Unit mA Unit V A 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 Anachip Corp. www.anachip.com.tw 4/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller 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 Typical Characteristics REFERENCE OUTPUT VOLTAGE v.s. POWER-SUPPLY VOLTAGE 0.785 0.78 0.775 0.77 0.765 0.76 0.755 AVERAGE SUPPLY CURRENT v.s. POWER-SUPPLY VOLTAGE Icc-Average Supply Current (mA) 5 4 3 2 1 0 0 4 8 12 16 20 VrefReference Output Voltage (V) 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 v.s. AMBIENT TEMPERATRUE 7 6 5 4 3 2 -50 -25 0 25 50 75 100 VCT v.s. 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 Temperatrure() Frequency (KHz) Anachip Corp. www.anachip.com.tw 5/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller Typical Characteristics (Continued) OSCILLATOR FREQUENCY v.s. TIMING CAPACITANCE tscp-SCP Timeout Period (ms) 350 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 v.s. SCP CAPACITANCE 90 135 180 225 270 315 360 405 450 495 CT-Timing Capacitor (pF) Cscp - SCP Capacitance (nF) 30 25 20 15 10 5 0 SOFT-START TIME (Ts) v.s. SOFT-START CAPACITOR (Css) Ts (mS) 25 50 75 100 125 150 175 200 Css (nF) Marking Information (Top View) 8 5 Logo Part No. AP2008 YY WW X X 1 4 ID code Blank: normal L: Lead Free Package Xth week: 01~52 Year: "01" =2001 "02" =2002 ~ PDIP/SOP Anachip Corp. www.anachip.com.tw 6/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller Package Information (1) PDIP-8L (Plastic Dual-in-line Package ) D E-PIN O0.118 inch E1 E 15 (4X) PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch 7 (4X) eB A2 A C L B S e B1 B2 Symbol A A1 A2 B B1 B2 C D E E1 e L eB S Dimensions in millimeters Min. Nom. Max. 5.33 0.38 3.1 3.30 3.5 0.36 0.46 0.56 1.4 1.52 1.65 0.81 0.99 1.14 0.20 0.25 0.36 9.02 9.27 9.53 7.62 7.94 8.26 6.15 6.35 6.55 2.54 2.92 3.3 3.81 8.38 8.89 9.40 0.71 0.84 0.97 A1 Dimensions in inches Min. Nom. Max. 0.210 0.015 0.122 0.130 0.138 0.014 0.018 0.022 0.055 0.060 0.065 0.032 0.039 0.045 0.008 0.010 0.014 0.355 0.365 0.375 0.300 0.313 0.325 0.242 0.250 0.258 0.100 0.115 0.130 0.150 0.330 0.350 0.370 0.028 0.033 0.038 Anachip Corp. www.anachip.com.tw 7/8 Rev. 1.0 Oct 11, 2004 AP2008 PWM Buck Controller Package Information (Continued) (2) SOP- 8L(JEDEC Small Outline Package) E H L VIEW "A" D 7 (4X) A2 A 0.015x45 7 (4X) A1 e B y C VIEW "A" Symbol A A1 A2 B C D E e H L y Dimensions In Millimeters Min. Nom. Max. 1.40 1.60 1.75 0.10 0.25 1.30 1.45 1.50 0.33 0.41 0.51 0.19 0.20 0.25 4.80 5.05 5.30 3.70 3.90 4.10 1.27 5.79 5.99 6.20 0.38 0.71 1.27 0.10 O 0 8O Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.100 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.010 0.189 0.199 0.209 0.146 0.154 0.161 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0.004 O 0 8O Anachip Corp. www.anachip.com.tw 8/8 Rev. 1.0 Oct 11, 2004 |
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