FSP3122

FSP3122 FOSLINK | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 10

Technical content

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 1/10 FSP3122 „ PIN CONFIGURATION ( 1 ) T O 2 2 0 - 5 L ( 2 ) T O 2 5 2 - 5 L ( T o p V i e w ) ( T o p V i e w ) (3) TO263-5L (Top View) Symbol Name Descriptions

1 Vin Operating Voltage Input

2 Output Switching Output

3 Gnd Ground

4 FB Output Voltage Feedback Control

5 SD ON/OFF Shutdown

„ FEATURES z Output voltage: 3.3 V, 5.0V, 12V, and adjustable output version z Adjustable version output voltage range:1.23V to 37V±4% z 150KHz±15% fixed switching frequency z Voltage mode non-synchronous PWM control z Thermal-shutdown and current-limit protection z ON/OFF shutdown control input z Operating voltage can be up to 40V z Output load current: 3A z Low power standby mode z Built-in switching transistor on chip z TO220-5L ，TO252-5L and TO263-5L packages „ APPLICATIONS z Simple High-efficiency step-down regulator z On-card switching regulators z Positive to negative converter „ GENERAL DESCRIPTION The FSP3122 series are monolithic IC that design for a step-down DC/DC converter, and own the ability of driving a 3A load without additional transistor component. Due to reducing the number of external component, 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 feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. The FSP3122 series operates at a switching frequency of 150 KHz 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 fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO-220 package ， 5-lead TO252 package and a 5-lead TO-263 package. Metal Tab Gnd

1 VIN

2 OUTPUT

3 GND

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 2/10 FSP3122 „ BLOCK DIAGRAM „ ABSOLUTE MAXIMUM RATINGS Symbol Paramrter Rating Unit VCC Supply Voltage +45 V VSD ON/OFF Pin input Voltage -0.3 to +25 V VFB Feedback Pin Voltage -0.3 to +25 V VOUT Output Voltage to Ground -1 V PD Power Dissipation Internally Limited W TST Storage Temperature -65 to +150 ℃ TOP Operating Temperature -40 to +125 ℃ VOP Operating Voltage +4.5 to +40 V Source Frequency -Comp Current Limit 1.235V up SD Regulator OSC. Start Am p Comp4 +Comp Sw itchFB 3A 150KHz 220mV Thermal 220mV 2.5V Pre-driver Reference OUTPUT bias VI N compensation GND

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 3/10 FSP3122 „ ELECTRICAL CHARACTERISTICS (ALL OUTPUT VOLTAGE VERSIONS) Unless otherwise specified, VIN=12V for 3.3V,5V, adjustable version and VIN=24V for the 12V version. ILOAD=0.5A Symbol Paramrter Conditions Min. Typ. Max. Unit 50 IB Feedback bias current VFB=1.3V(Adjustable version only) 40 100 nA 127 150 173 FOSC Oscillator frequency 110 173 KHz VSAT Saturation voltage IOUT=3A no outside circuit V FB=0V force driver on 1.16 1.4 V Max.Duty Cycle(ON) V FB=0V force driver on 100 DC Min.Duty Cycle(OFF) V FB=12V force driver off 0 % ICL Current limit Peak current no outside circuit V FB=0V force driver on 3.6 6.9 A Output=0 no outside circuit VFB=12V force driver off 50 µA IL Output=-1 Output leakage current VIN=40V 5 30 mA IQ Quiescent Current V FB=12V force driver off 7.8 10 mA ISTBY Standby Quiesient Current ON/OFF Pin=5V VIN=40V 85 200 µA VIL Low(regultaor ON) 0.6 VIH ON/OFF pin logic input threshold voltage High(regultaor OFF) 2.0 1.4 V IH ON/OFF pin logic input current VLOGIC=2.5V(OFF) 6 15 IL ON/OFF pin input current VLOGIC=0.5V(ON) 0.02 5 µA TO252-5L 10 TO220-5L 2.5 θJC Thermal Resistence TO263-5L Junction to case 3.5 /W℃ TO252-5L 30 TO220-5L 28 θJA Thermal Resistence With copper area of approximately 3 in2 TO263-5L Junction to ambient /W℃ „ ELECTRICAL CHARACTERISTICS (CONTINUED) Symbol Parameter Conditions Typ. Limit Unit VFB Output Feedback 4.5V≤VIN≤40V 0.2A≤ILOAD≤3A VOUT programmed for 1.23 1.193/1.18 1.267/1.28 V VMIN VMAX FSP3122-ADJ η Efficiency V IN =12V, I LOAD =3A 72 % VOUT Output voltage 5V≤VIN≤40V 0.2A≤ILOAD≤3A 3.3 3.168/3.135 3.432/3.465 V VMIN VMAX FSP3122-3.3V η Efficiency V IN =12V, I LOAD =3A 72 % VOUT Output voltage 7V≤VIN≤40V 0.2A≤ILOAD≤3A 5 4.8/4.75 5.2/5.25 V VMIN VMAX FSP3122-5V η Efficiency V IN =12V, I LOAD =3A 79 % VOUT Output voltage 15V≤VIN≤40V 0.2A≤ILOAD≤3A 12 11.52/11.4 12.48/12.6 V VMIN VMAX FSP3122-12V η Efficiency V IN =15V, I LOAD =3A 90 % Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 4/10 FSP3122 „ TYPICAL PERFORMANCE CHARACTERISTICS -1.5 -1.0 -0.5 0.5 -50 -25 0 25 50 75 100 125 VIN=20V I LOAD=3A Normalixed at TJ=25℃ JUNCTION TEMPERATURE(℃) OUTPUT VOLTAGE CHANGE(%) Normalized Output Voltage 1.0 1.5 0.60 0.80 1.00 1.20 1.40 1.60 0.5 1 2 3 SWITCH CURRENT(A) SATURATION VOLTAGE(V) 1:-40℃ 2:25℃ 3:125℃ Switch Saturation Voltage VIN=12V 0.6 0.8 1.0 1.2 1.4 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE(℃) INPUT-OUTPUT DIFFERENTIAL (V) Dropout Voltage 1.6 1.8 ILOAD=1A ILOAD=3A L=33µH RIND=0.04O VOUT=VREG-50mV 130 135 140 145 150 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE(℃) Switching Frequency 155 160 FREQUENCY (KHz)

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 5/10 FSP3122 „ TYPICAL APPLICATION CIRCUITS (1) Fixed Output Circuit (2) Adjustable Output Circuit -50 -25 0 25 50 75 100 125 0.0 0.5 1.0 1.5 2.0 2.5 ON/OFF Threshold Voltage THRESHOLD VOLTAGE(V) JUNCTION TEMPERATURE(℃) OFF ON -50 -25 0 25 50 75 100 125 3.50 4.00 4.50 5.00 5.50 V IN=12V Vout=5V SWITCH CURRENT LIMIT(A) Switch Current Limit JUNCTION TEMPERATURE(℃)

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 6/10 FSP3122 „ FUNCTION DESCRIPTION Pin Function VIN This is the positive input supply for the IC switching regula tor. 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 circ uitry, the PC board copper area connected to this pin should be kept a minimum. Feedback Senses the regulated output voltage to complete the feedback loop. ON/OFF Allows the switching regulator circuit to be shutdown us ing logic level signals thus dropping the total 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 maxi mum of 25V) shuts the regula tor down. If this shutdown feature is not needed, the ON/OFF pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the ON condition. Thermal Considerations The FSP3122 is available in three packages, a 5-pin TO -220, 5-pin TO252 and a 5-pin surface mount TO-263. The TO-220 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The FSP3122 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the FSP3122 (TO-220 package) operati ng as a buck switching regulator in an ambient temperature of 25 oC (still air). These temperature rise numbers are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. The TO-263 surface mount package tab is desi gned 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 0.4 in 2, and ideally should have 2 or more square inches of 2 oz. Additional c opper area improves the thermal characteristics, but with copper areas greater than approximately 6 in 2, only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multilayer PC board with large copper areas and/or airflow are recommended. The FSP3122 (TO-263 package) junction temperature ri se above ambient temperature with a 2A 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 curve can be used for a quick check fo r the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the juncti on temperature. When load currents higher than 2A are used, double sided or mult ilayer 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. (Once exception to th is 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 ri se 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 double-sided, multilayer 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 ca n 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 2007-6-12 7/10 FSP3122 „ ORDERING INFORMATION „ MARKING IN FORMATION 1) TO220-5L 2) TO263-5L (3) TO252-5L 3122-VV YYWWXX Logo Part Number: 3122-ADJ: ADJ 3122-33: 3.3V 3122-50: 5.0V 3122-12: 12V Internal Code Date Code: YY: Year (01=2001) WW: Nth week (01~52) FSP3122XXXX Package: T: TO220-5L K: TO263-5L D: TO252-5L Output Voltage: Blank: ADJ 33: 3.3V 50: 5.0V 12: 12V Packing: Blank: Tube or Bulk A: Tape & Reel Temperature Grade: E: -40~125℃ 3122-VV YYWWXX Logo Part Number: 3122-ADJ: ADJ 3122-33: 3.3V 3122-50: 5.0V 3122-12: 12V Internal Code Date Code: YY: Year (01=2001) WW: Nth week (01~52) 3122-VV YYWWXX Logo Part Number: 3122-ADJ: ADJ 3122-33: 3.3V 3122-50: 5.0V 3122-12: 12V Internal Code Date Code: YY: Year (01=2001) WW: Nth week (01~52)

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 8/10 FSP3122 „ PACKAGE INFORMATION 1) TO220-5L A F C L D Q E e b P

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 9/10 FSP3122 2) TO263-5L L2 2.92 0.115 e B E D L C A 9.10 Land Pattern Recommendation (Unit: mm) 10.90 15.70 2.50 1.701.00

150KHZ 3A PWM BUCK DC/DC CONVERTER 2007-6-12 10/10 FSP3122 (3) TO252-5L Dimensions In Millimeters Dimensions In Inches Symbol Min. Max. Min. Max. A 2.200 2.400 0.087 0.094 A1 0.000 0.127 0.000 0.005 b 0.400 0.600 0.016 0.024 c 0.430 0.580 0.017 0.023 c1 0.430 0.580 0.017 0.023 D 6.350 6.650 0.250 0.262 D1 5.200 5.400 0.205 0.213 E 5.400 5.700 0.213 0.224 e 1.270TYP. 0.050TYP. e1 2.540TYP. 1.000TYP. L1 9.500 9.900 0.374 0.390 L2 1.400 1.780 0.055 0.070 L3 2.550 2.900 0.100 0.114 V 3.800REF 0.150REF D e b A EL3 c V