S5E2596M SECOS | Alldatasheet
Document overview
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- PDF pages: 6
Technical content
Features
- High-Effciency Step-Down Regulator * Positive To Negative Converter * One-ch Switching Regulators Simple
Applications
150 KHz, 3A PWM
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 6 tage does not sag below the minimum dropout voltage during the load V higher than Vout in order for the device to
Description
Typically a large storage capacitor is connected from this pin to ground to insure that the input 1.3V or open= output enable. NC Pin Function Pin Name Pin# Function VIN 1 This is the positi ve 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 current needed by regulator. Output 2 Internal switch. The voltage at this pin switches between (+V IN - V SAT) and approximately -0.5V, with a duty cycle of approximately V OUT/VIN . To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be keep to a minimum. Ground 3 Circuit ground Feedback(FB) 4 Senses the regulated output voltage to complete the feedback loop . ON/OFF(SD) Allows the switching regulator circuit to be shutdown using logic level signals. Thus drop the total input supply current to approximately 150 A. 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, ON/OFF pin can be wired to the ground pin. Absolute Maximum Ratings Parameter Symbol Ratings Unit Supply Voltage VCC 24 V ON/OFF Pin Input Voltage VSD -0.3 ~ +18 V Feedback Pin Voltage VFB -0.3 ~ +18 V Output Voltage to ground VOUT -1 V Power Dissipation PD Internally Limited W Storage Temperature TST -65 ~ +150 : Operating temperature TOP -40 ~ +125 : Operating Voltage VOP +4.5 ~ +22 V Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 5 VIN 22V, 0.2A ILOAD 3A Efficiency VIN=12V, ILOAD=3A, VOUT=3V 74 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 5.5V VIN 22V Efficiency VIN=12V, ILOAD=3A 75 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 8V VIN 22V Efficiency VIN=12V, ILOAD=3A 80 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 15V VIN 22V Efficiency VIN=16V, ILOAD=3A 89 % S5E2596M must be present at this pin to minimize voltage transients and to supply the switching current . To minimize coupling to sensitive circuitry, the PC 0.5V, Allows the switching regulator circuit to be shutdown using logic level signals. Thus drop the total threshold voltage of 18V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to of 18V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to
01-Jun-2002 Rev. A Page 3 of 6 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente All Output Voltage Version Electrical Characteristics Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Feedback bias current IFB VFB=1.3V (adjustable version only) - -10 -50/-100 nA Oscillator frequency FOSC 127/110 150 173/173 kHz Oscillator frequency of short circuit protect FSCP When current limit occurred and VFB<0.5V, TA=25 :. 5 15 25 kHz Saturation voltage VSAT ILOAD=3A No outside circuit VFB=0V force drive on - 1.4 1.6/1.7 V Max. duty cycle (ON) VFB=0V force drive on - 100 - Max. duty cycle (OFF) DC VFB=12V force drive off - 0 - % Current limit ICL Peak current No outside circuit VFB=0V force drive on 3.6 4.5 5.5/6.5 A Output=0V, No outside circuit VFB=12V force drive off - - -200 uA Output leakage current IL Output=-1V, VIN=22V - -5 - mA Quiescent current IQ VFB=12V force drive off - 5 10 mA VIL Low (Regulator ON) - -
0.6 ON/OFF pin logic input
Threshold Voltage VIH High (Regulator OFF) 2.0 - - V ON/OFF pin Logic input current IH VLOGIC=2.5V ( Regulator OFF) - - -0.01 ON/OFF pin input current IL VLOGIC=0.5V ( Regulator ON) - -0.1 -1 uA Standby quiescent current ISTBY ON/OFF pin=5V, VIN=12V - 150 200 uA JC Junction to Case - 2.5 - Thermal Resistance JA Junction to Ambient with copper area of approximately 3 in2 - 28 - :/W Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version. ILOAD=0.5A Function Description 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 S5E2596M junction temperature rises above ambient temperature with a 3A load and different input and output voltages. The data for these curves was taken with the S5E2596M operating as a buck-switching regulator in an ambient temperature of 25: (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. 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 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, 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 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. S5E2596M
01-Jun-2002 Rev. A Page 4 of 6 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Typical Application Circuit (1)Fixed Type Circuit (2)Adjustable Type Circuit (3)Delay Start Circuit S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 S5E2596M -33 BMKFEBMKFEBMKFEBMKFEBMKFE BMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFE BMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFEBMKFE BMKFE BMKFEBMKFEBMKFES5E2596M S5E2596M S5E2596M -33 S5E2596M
01-Jun-2002 Rev. A Page 5 of 6 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Typical Performance Characteristics S5E2596M
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 6 of 6 tage does not sag below the minimum dropout voltage during the load V higher than Vout in order for the device to Typically a large storage capacitor is connected from this pin to ground to insure that the input 1.3V or open= output enable. NC S5E2596M