1507-12

AP1507_08 DIODES | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 11

Technical content

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 1 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Lead-free Features General Description The AP1507 is a monolithic IC designed for a step-down DC/DC converter and is capable of drivi ng a 3A load without an external transistor. Due to reducing the number of external components, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes the feedback control have good line and load regulation without an external design. Regarding the protected function, the thermal shutdown is to prevent over temperature operating from damaging the device, and current limit is against over current operating of the output switch. If the current limit function occurred and V FB is down to 0.5V below, the switching frequency will be reduced. The AP1507 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed + 4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included a fixed 3.3V, 5V, 12V, and an adjustable type. AP 1507 is available in a 5-lead TO-252 lead-free package.

• Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version
• Adjustable Version Output Voltage Range, 1.23V to 18V+
• 150KHz +15% Fixed Switching Frequency
• Voltage Mode Non-Synchronous PWM Control
• Thermal-Shutdown and Current-Limit Protection
• ON/OFF Shutdown Control Input
• Operating Voltage can be up to 22V
• Output Load Current: 3A
• Lead Free Package: TO252-5L
• Low Power Standby Mode
• Built-in Switching Transistor On Chip
• Lead Free Package: TO252-5L
• Lead Free Finish/ RoHS Compliant (Note 1)

Applications

• Simple High-Efficiency Step-Down Regulator
• On-Card Switching Regulators
• Positive to Negative Converter

Ordering Information

D5 : TO252-5L Output Version AP1507 - XX XX X X Packing -U : Tube -13 : Tape & Reel Blank : Adjustable 33 : 3.3V 50 : 5.0V 12 : 12V Lead Free L : Lead Free Tube/Bulk 13” Tape and Reel Device Package Code Packaging (Note 2) Quantity Part Number Suffix Quantity Part Number Suffix AP1507-XXD5 D5 TO252-5L 80 -U 2500/Tape & Reel -13 2. Pad layout as shown on Diodes Inc. suggested pad la yout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf .

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 2 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated (Top View) TO252-5L 5 SD 4 FB

3 GND

2 Output

1 VIN

VIN Operating Voltage Input Output Switching Output GND Ground FB Output Voltage Feedback Control SD ON /OFF Shutdown Block Diagram Current Source Bias 1.235V Reference 2.5V Regulator 150kHz OSC. Start Up Thermal Shutdown Pre- Driver Comp Comp GND Output VIN SD FB 220mV200mV Switch _ _Amp Comp Frequency Compen- sation Pin Assignments Pin Descriptions

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 3 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit ESD HBM Human Body Model ESD Protection 2 KV ESD MM Machine Model ESD Protection 200 V VCC Supply Voltage +24 V VSD ON/OFF Pin Input Voltage -0.3 to +18 V VFB Feedback Pin Voltage -0.3 to +18 V VOUT Output Voltage to Ground -1 V PD Power Dissipation Internally Limited W TST Storage Temperature -65 to +150 oC TJ Operating Junction Temperature -40 to +125 oC Recommended Operating Conditions Symbol Parameter Min Max Unit IOUT Output Current 0 3 A VOP Operating Voltage 4.5 22 V TA Operating Ambient Temperature -20 85 oC

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 4 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Electrical Characteristics (All Output Voltage Versions) Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V for the 12V version. ILO = 0.5A AD Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Symbol Parameter Conditions Min. Typ. Max. Unit -50 IFB Feedback Bias Current VFB = 1.3V ( Adjustable Version Only ) -10 -100 nA 127 150 173 FOSC Oscillator Frequency 110 173 KHz FSCP Oscillator Frequency of Short Circuit Protect When current limit Occurred and VFB < 0.5V, Ta = 25 oC 10 30 50 KHz 1.6 VSAT Saturation Voltage IOUT = 3A No Outside Circuit VFB = 0V Force Driver On 1.4 1.7 V Max. Duty Cycle (ON) VFB = 0V Force Driver On 100 DC Min. Duty Cycle (OFF) VFB = 12V Force Driver Off 0 % 5.5 ICL Current Limit Peak Current No Outside Circuit V FB = 0V Force Driver On 3.6 4.5 6.5 A Output = 0V No Outside Circuit V FB =12V Force Driver Off -200 uA ILEAK Output = -1V Output leakage current V IN = 22V -5 mA IQ Quiescent Current VFB = 12V Force Driver Off 5 10 mA

150 ISTBY Standby Quiescent

ON/OFF Pin = 5V V IN = 22V 70 200 uA VIL Low (Regulator ON) - 0.6 VIH ON/OFF Pin Logic Input Threshold Voltage High (Regulator OFF) 2.0 1.3 - V IH ON/OFF Pin Logic Input Current V LOGIC = 2.5V (OFF) -0.01 IL ON/OFF Pin Input Current VLOGIC = 0.5V (ON) -0.1 -1 uA θJA Thermal Resistance TO252-5L Junction to Case 10 oC/W θJC Thermal Resistance with copper area of approximately 2cm ×2cm TO252-5L Junction to Ambient 50 oC/W

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 5 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Electrical Characteristics (Continued) Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Symbol Parameter Conditions VMin Typ. VMax Unit FBV Output Feedback 5V < VIN < 22V 0.2A < ILOAD < 3A VOUT Programmed for 3V 1.193 1.18 1.23 1.267 1.28 V AP1507-ADJ η Efficiency V IN = 12V, ILOAD = 3A 74 % OUTV Output Voltage 5.5V < VIN < 22V 0.2A < ILOAD < 3A 3.168 3.135 3.3 3.432 3.465 V AP1507-3.3V η Efficiency V IN = 12V, ILOAD = 3A 75 % OUTV Output Voltage 8V < VIN < 22V 0.2A < ILOAD < 3A 4.8 4.75 5 5.2 5.25 V AP1507-5V η Efficiency V IN = 12V, ILOAD = 3A 80 % OUTV Output Voltage 15V < VIN < 22V 0.2A < ILOAD < 3A 11.52 11.4 12 12.48 12.6 V AP1507-12V η Efficiency V IN = 16V, ILOAD = 3A 89 %

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 6 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Typical Performance Characteristics AP1507 Efficiency vs. Temperature (Vin = 12V, Vout = 5V, Io = 3A) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Efficiency (%) AP1507 Efficiency vs. Temperature (Vin = 12V, Vout = 3.3V, Io = 3A) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Efficiency (%) AP1507 Saturation Voltage vs. Temperature (V cc = 12V, Vfb = 0V, VSD = 0) 0.7 0.8 0.9 1.1 1.2 1.3 1.4 1.5 1.6 -50 -25 0 25 50 75 100 125 Temperature (TA) (°C) Saturation Voltage (V) 0.5A AP1507 Switch Current Limit vs. Temperature (Vcc = 12V, Vfb = 0V) 3.5 4.5 5.5 - 5 0 - 3 0 - 1 0 1 03 05 07 09 0 Temperature (TA) (°C) Switch Current Limit (A) AP1507 Supply Current vs. Temperature (Vcc = 12V, No Load, Von/off = 0V (Switch ON), Von/off = 5V (Switch OFF)) -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Supply Current (mA) Switch ON -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Supply Current (uA) Switch OFF

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 7 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) AP1507 Threshold Voltage vs. Temperature ( V cc = 12V, Io = 100mA) 0.8 0.9 1.1 1.2 1.3 1.4 1.5 1.6 1.7 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Threshold Voltage (V) AP1507 ON/OFF Current vs. ON/OFF Voltage (Vin= 12V) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3 6 9 12 15 18 21 ON/OFF Voltage (V) ON/OFF Current (nA) AP1507 Frequency vs. Temperature (Vcc = 12V, Io = 500mA, Vout = 5V) 140 145 150 155 160 165 170 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Frequency (KHz) AP1507 Feedback Current vs. Temperature (Vcc = 12V, Vout = 5V, Vfb = 1.3V) -50 -40 -30 -20 -10 -50 -30 -10 10 30 50 70 90 110 130 150 Temperature (TA) (°C) Feedback Current (nA) AP1507 Output Voltage vs. Temperature (Vin = 12V, Io = 3A) 2.9 2.95 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 -40 -20 0 20 40 60 80 100 120 140 160 Temperature (TA) (°C) Vout (V)

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 8 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Typical Application Circuit (1) Fixed Type Circuit 412V DC Input Cin Capacitor FB SD D1 Schottky Diode Vin GND OutputAP1507 -33 Co Capacitor Inductor 33uH 3.3V/3A Output Load (2) Adjustable Type Circuit 412V DC Input Cin Capacitor FB SD D1 Schottky Diode Vin GND OutputAP1507 Co Capacitor 47uH 5V/ 3A Output Load R2 R1 Vout = VFB × (1 + R1 ) VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit 412V DC Input Cin Capacitor FB SD D1 Schottky Diode Vin GND OutputAP1507 Co Capacitor 47uH 5V/ 3A Output Load R2 R1 CDELAY 0.1uF 10K RDELAY

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 9 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Applications Information Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+V IN – VSAT) and approximately – 0.5V, with a duty cycle of approximately V OUT / V IN. To minimize coupling to sensitive circuitry, the PC board copper ar ea connected to this pin should be kept at a minimum. Feedback (FB) Senses the regulated output voltage to complete the feedback loop. ON/OFF (SD) Allows the switching regulator ci rcuit to be shutdown using logic level signals thus dropping the to tal input supply current to approximately 150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, the ON/OFF pin can be wired to the ground pin. Thermal Considerations The TO-252 surface mount package tab is designed to be soldered to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in , and ideally should have 2 or more square inches of 2 oz. additional copper area which improves the thermal characteristics. Wi th copper areas greater than approximately 6 in , only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or airflow will be recommended. The AP1507 (TO-252 package) junction temperature rises above ambient temperature with a 3A load for various input and output voltages. This data was taken wi th the circuit operating as a buck-switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curv e can be used for a quick check for the approximate junction tem perature for various conditions, but there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (One exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are trace width, total printed circuit copper area, copper thickness, single or doubl e-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 10 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated Marking Information (1) TO252-5L 1507 - XXOutput Type : Blank : Adjustable 1507-50 : 5.0V 1507-12 : 12V Logo Internal code Xth Week : 01~52 Year : ( Top view ) "08" = 2008 "07" = 2007 YY WW X X L : Lead Free 1507-33 : 3.3V Package Information (All Dimensions in mm) (1) Package Type: TO252-5L

150KHz, 3A PWM BUCK DC/DC CONVERTER AP1507 Rev. 2 11 of 11 FEBRUARY 2008 www.diodes.com © Diodes Incorporated 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.