AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER General Description Features • • • • • • • • • AP1510 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, and internal PMOS. Input voltage: 3.6V to 23V Output voltage: 0.8V to VCC Duty ratio: 0% to 100% PWM control Oscillation frequency: 300KHz typ. Soft-start, Current Limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOS SOP-8L Pb-Free Package Lead Free Finish/RoHS Compliant (Note 1) AP1510 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP–8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Applications • • • • • • • • • • Cellular Phones PC Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply Ordering Information A P 1 5 10 X X X Package Lead-Free S : SOP-8L L : Lead-Free Packing -U : Tube -13 : Taping Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device (Note 2) Package Code Packaging AP1510S S SOP-8L Tube Part Number Quantity Suffix 100 -U 13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel Lead-free Note: 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. AP1510 Rev. 1 1 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated -13 AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER Pin Descriptions Pin Assignments 8 Vss 7 Vss OCSET 3 6 Output VCC 4 5 Output FB 1 EN 2 Name FB EN AP1510 OCSET VCC Output VSS Pin Description 1 Feedback pin. Power-off pin H: Normal operation 2 (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set 3 max output current. 4 IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize 5, 6 trace area at this pin to reduce EMI. 7, 8 GND Pin Block Diagram Output Oscillation Circuit Reference Voltage Source with Soft Start Vcc + PWM-Switched Control Circuit FB - Thermal Shutdown VEN EN AP1510 Rev. 1 2 of 8 www.diodes.com 100uA Vss OCSET JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER Absolute Maximum Ratings Symbol VCC VFB VEN VOUT PD TOPR TSTG Caution: Parameter VCC Pin Voltage Feedback Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Rating VSS - 0.3 to VSS + 25 VSS - 0.3 to VCC VSS - 0.3 to VIN + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -20 to +125 -40 to +150 Unit V V V V mW o C o C The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Electrical Characteristics ( VIN = 12V, Ta = 25°C, unless otherwise specified ) Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off ∆VOUT Line Regulation /VOUT ∆VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH EN Pin Input Voltage VSL ISH EN Pin Input Leakage Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI θJA Efficiency Conditions Min. 3.6 0.784 3.5 Typ. 0.8 0.1 - Max. 23 0.816 0.5 - Unit V V µA A VEN = 0V - 10 - µA VIN = 5V~23V, IOUT = 0.2A - 1 2 % IOUT = 0.1 to 3A - 0.2 0.5 % Measure waveform at SW pin 240 300 360 KHz Measure waveform at SW pin 10 - - KHz Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin ----VIN = 5V, VFB = 0V VIN =12V, VFB = 0V VIN = 12V, VOUT = 5V IOUT = 3A 2.0 75 0.3 - 20 -10 90 2 110 70 0.8 105 5 150 100 - 91 - - 65 - -IOUT = 0.1A IOUT = 0.1A -- Thermal Resistance Junction-to-Ambient AP1510 Rev. 1 3 of 8 www.diodes.com V µA µA µA ms mΩ % o C/W JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER Typical Application Circuit Vcc V IN R OCSET C OCSET 3.9K Option C IN CVcc 0.1uF R EN 100K 22uH CC Optional AP1510 RA 6.8K + FB OCSET 470uF VOUT =5V/3A L1 Output V SS EN D1 C + 0.1uF - C OUT 470uF RB 1.3K CEN 0.1uF Note: V OUT = V FB x (1+R A/R B) R B=0.7K~5K ohm Figure 1. VOUT L1 Value VIN=12V, IMAX=3A 2.5V 3.3V 15uH 18uH 5V 22uH Function Description PWM Control The AP1510 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1510, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. RDS(ON) Current Limiting The current limit threshold is setting by the external resistor connecting from VCC supply to OCSET. The internal 100uA sink current crossing the resistor sets the voltage at pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an over-current condition is triggered. ILOAD × RDS(ON) = IOCSET × ROCSET See above formula for setting the current limit value. Under Voltage Lockout The under voltage lockout circuit of the AP1510 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V. AP1510 Rev. 1 4 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER AP1510 Vin vs. Frequency (Vout=3.3V; Iout=0.2A) 350 345 340 335 330 325 320 315 310 305 300 FB (V) Fosc (KHz) Typical Performance Characteristics 0 5 10 15 Vin (V) 20 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 0 25 AP1510 Line Regulation (Vout=3.3V; Iout=0.2A) 3.40 3.35 Vout (A) Vout(V) 3.30 3.25 3.20 3.15 3.10 0 5 10 Vin(V) 15 20 AP1510 Vin vs. FB (Vout=3.3V; Iout=0.2A) 25 5 10 15 20 Vin (V) 25 AP1510 Load Regulation (Vin=12V) 5.10 5.09 5.08 5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 0.0 1.0 2.0 3.0 4.0 Iout (A) Efficiency (%) AP1510 Efficiency 100 90 80 70 60 50 40 30 20 10 0 Vout:5.0V Vout:3.3V 0.0 AP1510 Rev. 1 1.0 Iout (A) 2.0 3.0 5 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER Typical Performance Characteristics ( Continued ) AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=3A) AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=0.1A) Test Circuit VCC OUTPUT FB Oscillation open open OCSET A EN VCC + - A + - VSS OUTPUT VCC OUTPUT OCSET EN FB VSS FB OCSET EN VSS + V - AP1510 Rev. 1 6 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER Marking Information (1) SOP-8L ( Top View ) 8 5 Logo Part no. AP1510 YY WW X 4 Device Package AP1510S Package Information ~ 1 ID code: internal Xth week: 01~52 Year: "01" =2001 "02" =2002 Identification Code SOP-8L AP1510 ( in mm ) 0.254 0.08/0.25 5.79/6.20 3.70/4.10 Package Type: SOP-8L Gauge Plane Seating Plane 0.38/1.27 Detail "A" 7°~9° 0.20typ 1.75max. 1.30/1.50 0.35max. 45° 0.3/0.5 1.27typ 7°~9° Detail "A" 3.70/4.10 4.80/5.30 AP1510 Rev. 1 7 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1510 PWM CONTROL 3A STEP-DOWN CONVERTER 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. AP1510 Rev. 1 8 of 8 www.diodes.com JANUARY 2007 © Diodes Incorporated DIODES科技大陸代理商： 景淩達(香港)有限公司 GOLDLIGHT(HONGKONG) CO.,LTD 深圳市景淩達電子有限公司 SHENZHEN GOLDLIGHT ELECTRONICS CO.,LTD Govin(龍曉飛) TEL:0755-28132705(EXT:8688) 61331851(EXT:8688) 83263976 FAX:0755-83263978 28132705(EXT:88) Mobile:13802560427 MSN:[email protected] Http://www.anachip.net Http://www.anachipCN.com Http://www.diodes.com E-mail: [email protected] E-mail: [email protected] ADD:深圳市福田區振華路桑達電子區華明大廈318室