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hym 2596 - 1 - features output v oltage: 3.3v, 5v, 12v and a djustable o utput v ersion adjustable v ersion o utput v oltage r ange, 1 . 23v to 37v 4% 150 k h z 15% f ixed s witching f requency voltage m ode n on - s ynchronous pwm c ontrol thermal - s hutdown and c urrent - l imit p rotection on/off s hutdown c ontrol i nput operating v oltage c an be u p to 40v output l oad c urrent: 3a to220 - 5l to220 - 5l(r) and to263 - 5l p ackages low p ower s tandby m ode built - i n s witching t ransistor on c hip applications simple high - efficiency s tep - d own r egulator on - card s witching r egulators positive to n egative c onverter g eneral description the HYM2596 series are monolithic ic that design for a step - down dc/dc converter, and own the ability of driving a 3a load without additional transist or 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 HYM2596 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 14% tolerance on output voltage under specified input voltage and outpu t load conditions, and 15% on the oscillator frequency. the output version included fixed 3.3v, 5v, 12v, and an adjustable type. the packages are availa ble in a standard 5 - lead to - 22 0 package and a 5 - lead to - 263. block diagram and pin diagram pin assignm ent hym 2596 s imple s witcher power converter 150khz 3a step - down voltage regulator data sheet
hym 2596 - 2 - block diagram pin d escription pin number symbol description 1 +v in 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 transient s and to supply the switching currents needed by the regulator. 2 output 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 /v in . to minimize coupling to sensitive circuitry, the pc board copper area connected to this pin should be kept to a minimum. 3 gnd circuit ground. 4 feedback senses the regulated output voltage to complete the feedback loop. 5 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 25v) shuts the regulator down. if this shutdown featu re 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.
hym 2596 - 3 - typical application (fixed output voltage versions) absolute maximum rating parameter rating unit maximum supply voltage +45 v on/off pin input voltage - 0.3 to 25 v feedback pin voltage - 0.3v to 25 v output voltage to ground - 1 v power dissipation internally limited w storage temperature range - 65 to +150 maximum junction temperature +150 te mperature range - 40 to +125 supply voltage 4.5 to 40 v electrical characteristics (all output voltage versions) symbol parameter conditions min. typ. max. unit 60 i fb feedback bias current v fb =1.3v (adjustable version only) 40 10 0 na 127 150 173 f osc oscillator frequency 110 173 khz 1.4 v sat s aturation voltage i out =3a no outside circuit v fb =0v force driver on 1.3 1.5 v max. duty cycle (on) v fb =0v force driver on 100 dc min. duty cycle (off) v fb =12v force driv er off 0 % 5.5 i cl current limit peak current no outside circuit v fb =0v force driver on 3.6 4.0 6.5 a output=0 no outside circuit v fb =12v force driver off 200 ua i l output= ? 1 output leakage current v in =40v 2 60 ma i q quiescent current v fb =12v force driver off 5 10 ma 250 i stby standby quiescent current on/off pin=5v v in =40v 150 300 a v il on/off pin logic input low (regulator on) 0.6
hym 2596 - 4 - v ih threshold voltage high (regulator off) 2.0 1.3 v i h on/off pin logic input curren t v logic =2.5v (off) 15 25 i l on/off pin input current v logic =0.5v (on) 0.02 5 ua to220 - 5l 2.5 jc thermal resistance to263 - 5l junction to case 3.5 to220 - 5l 28 ja thermal resistance with copper area of approximately 3 in 2 to263 - 5l junction to ambient 23 /w electrical characteristics (continued) symbol parameter conditions typ. limit unit v out output voltage 4.75v v in 40v 0.2a i load 3a 3.3 3.168/ 3.135 3.432/ 3.465 v v min v max HYM2596 - 3.3v efficiency v in =12v,i load =3a 73 % v out output voltage 4.75v v in 40v 0.2a i load 3a 5 4.8/ 4.75 5.2/ 5.25 v v min v max HYM2596 - 5v efficiency v in =12v,i load =3a 80 % v out output voltage 15 v in 40v 0.2a i load 3a 12 11.52/ 11.4 12.48/ 12.6 v v min v max HYM2596 - 12v v in =15v,i load =3a 90 % v fb outpu t feedback 4.5v v in 40v 0.2a i load 3a v out programmed for 3v 1.23 1.193/ 1.18 1.267/ 1.28 v v min v max HYM2596 - adj efficiency v in =12v,i load =3a 73 % specifications with standard type face are for t j = 25 o c , and those wit h boldface type app ly over full operating temperature ran g e .
hym 2596 - 5 - typical performance characteristics:
hym 2596 - 6 -
hym 2596 - 7 - thermal considerations the HYM2596 is available in two packages, a 5 - pin to - 220 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 HYM2596 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 HYM2596 (t o - 220 package) operating as a buck switching regulator in an ambient temperature of 25 o c (still air). these temperature rise numbers are all approximate and there are many factor s that can affect these temperatures. higher ambient temperatures require more heat sinking. the to - 263 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 pack age 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 l east 0.4 in 2 , and ideally should have 2 or more square inches of 2 oz. additional copper 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 air flow are recommended. the HYM2596 (t o - 263 package) junction temperature rise above ambient temperature with a 2a load for various input and output voltages. this data was taken with the circuit operating as a buck switching regulator with all components m ounted on a pc board to sim ulate the junction temperature under actual operating conditions. this curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. when load currents higher than 2a are used, double sided or multilayer 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 trace s and generous amounts of printed circuit board copper should be used in the board layout. (once 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 the rmal 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 th ese 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 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.
hym 2596 - 8 - typical application circuit fixed type circuit adjustable type circuit v out =v ref ? ? ? ? ? ? ? ? ? r r 2 1 where v ref =1.23v r 2 =r 1 ? ? ? ? ? ? ? ? ? 1 ref out v v r 2 =1k 3k feedforward capacitor (c ff ) for output voltages greater than approximately 1 0v, an additional capacitor is required. the compensation capacitor is typically between 100pf and 33nf, and is wired in parallel with the output voltage setting resistor, r 2 . it provides additional stability for high output voltages, low input - output voltages, and/ or very low esr output capacitors, such as solid tantalum capacitors.
hym 2596 - 9 - delay start circuit packa g e information package type: to220 - 5l
hym 2596 - 10 - package type: to 220 - 5l(r) mechanical drawing
hym 2596 - 11 - package type: t0263 - 5l mechanical drawing

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