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| AP1511 PWM Control 5A Step-Down Converter Features - 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-16L Pb-Free Package. General Description AP1511 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1511 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-16L 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 -Microprocessor core supply -Networking power supply -LCD MNT, TV power supply -Telecom power supply Pin Assignments Pin Descriptions Pin Description No. 1 GND pin 2 GND pin 3 Feedback pin H: Normal operation EN 4 L: Step-down operation stopped Add an external resistor to set max OCSET 5 output current. Vcc 6 Signal Vcc Output 7 Switch output pin Output 8 Switch output pin Output 9 Switch output pin Output 10 Switch output pin PVcc 11 Power Vcc VC 12 Voltage clamp pin NC 13 Not connected NC 14 Not connected GND 15 GND pin GND 16 GND pin Pin Name GND GND FB (Top View) GND GND FB EN OCSET Vcc Output Output 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND GND NC NC VC PVcc Output Output AP1511 SOP-16L 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. 1.5 1/5 Apr 10, 2006 AP1511 PWM Control 5A Step-Down Converter Ordering Information AP 1511 X X Package S: SOP-16L Packing Blank : Tube A : Taping Block Diagram Output Vcc Oscillation Circuit Vccp Driver Thermal Shutdown VEN VC EN OCSET Vss PWM - Switched Control Circuit + FB CT Reference Voltage Source with Soft Start 100 uA Absolute Maximum Ratings Symbol VCC VFB VEN VOUTPUT PD TOPR VCC Pin Voltage VOUT Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation (Note) Operating Temperature Range Parameter Rating VSS - 0.3 to VSS + 25 VSS - 0.3 to VCC VSS - 0.3 to VCC + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -20 to +125 Unit V V V V mW o o C TSTG Storage Temperature Range -40 to +150 C Caution: 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. Note: Due to the IC and SBD and Inductor were hot in high current, if you need to reduce the operation temperature that you must increase the component space or thermal dissipation space. Anachip Corp. www.anachip.com.tw 2/5 Rev. 1.5 Apr 10, 2006 AP1511 PWM Control 5A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25C, unless otherwise specified) Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off Conditions --IOUT=0.1A -VEN=0V VIN = 3.6V~23V IOUT = 0 to 5A Measure waveform at SW pin Measure waveform at SW pin Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin ----VIN=5V, VFB=0V VIN=12V, VFB=0V VIN = 12V, VOUT = 5V IOUT = 5A Min. 3.6 0.784 5.5 240 10 2.0 75 0.3 Typ. 0.8 0.1 10 1 0.5 300 20 -10 90 2 70 50 90 50 Max. 23 0.816 0.5 2 1 360 0.8 105 5 100 70 o Unit V V A A A % % KHz KHz V A A A ms m % C/W VOUT Line Regulation /VOUT VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH Power-Off Pin Input Voltage VSL Power-Off Pin Input Leakage ISH Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI JA Efficiency Thermal Resistance Junction-to-Ambient Typical Application Circuit VIN 2.2 ROCSET 3K CIN 680uF REN 20K CEN 0.1uF COCSET C 0.1uF Vcc FB PVcc L1 15uH OUTPUT CC Optional RA 6.8K COUT 470uF RB 1.3K C 0.1uF VOUT AP1511 OCSET VC EN VSS D1 CVcc 0.1uF Note: VOUT = VREF x (1+RA/RB) RB=1K~10K ohm VOUT L1 Value VIN=12V, IMAX=5A 2.5V 3.3V 10uH 12uH 5V 15uH Anachip Corp. www.anachip.com.tw 3/5 Rev. 1.5 Apr 10, 2006 AP1511 PWM Control 5A Step-Down Converter Typical Performance Characteristics Efficiency (Vin=+5V) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Efficiency (Vin=+12V) Efficiency (%) Efficiency (%) Vout:3.3V Vout:5.0V Vout:3.3V 1.0 2.0 3.0 4.0 5.0 6.0 Iout (A) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Iout (A) Test Circuit Oscillation open PVcc OUTPUT VCC OCSET A FB open A + PVcc OUTPUT VCC OCSET EN FB EN VSS - VSS Enable function test Feedback function test PVcc OUTPUT VCC + - FB OCSET EN VSS + V Operation function test Function Description PWM Control The AP1511 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1511, 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. Anachip Corp. www.anachip.com.tw 4/5 Rev. 1.5 Apr 10, 2006 AP1511 PWM Control 5A Step-Down Converter Marking Information ( Top View ) 16 9 Logo Part No. AP1511 YY WW X 1 8 ID code: internal Xth week: 01~52 Year: "01" = 2001 "02" = 2002 ~ SOP-16L Package Information Package Type: SOP-16L E H L VIEW "A" 7o(4X) D 0.015x45o A2 A 7o(4X) A1 y Symbol A A1 A2 B C D E e H L 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 9.80 9.90 10.00 3.80 3.90 4.00 1.27 5.80 6.00 6.20 0.38 0.71 1.27 0 8 Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.010 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.0098 0.386 0.390 0.394 0.150 0.154 0.157 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0 8 Anachip Corp. www.anachip.com.tw 5/5 C e B VIEW "A" Rev. 1.5 Apr 10, 2006 |
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