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technical reference note (apc08) model: apc08 series sheet 1 of 23 august 9, 2002 - revision 02 centauri (apc08) non-isolated dc/dc power module tiny smt footprint ? 1.8v-12v input, 0.9v to 3.6v output the centauri (apc08) dc-dc power module is a high efficiency non-isolated buck converter designed for use in a wide variety of applications. it works from a wide input voltage range of 1.8v to 12v and offers an extensive array of output voltages starting from 0.9v to 3.6v. through careful layout and component selection it achieves the highest efficiency/load in the smallest footprint available in the market today. it is ideal for point of load applications and provides the most flexibility for the ever-changing dsp and asic power requirements. industry standard 0.53 x 1.3 x 0.29h smt package environmental specifications ? operating temperature: -40c to +85c ? storage temperature: -40c to +125c ? mtbf: >1 million hours electrical parameters input input range 1.8-6.0vdc and 6.0-12.0vdc input surge 13v efficiency 3.3v @ 93% typ control enable ttl compatible (positive logic) output regulation (line, load, temp) <3% ripple and noise 75mv - ( 3 3 2.5v output) 50mv - (<2.5v output) output voltage adjust range 0.9v to 3.6v (j version) transient response 5% max deviation with 50% to 75% full load 500 s ( max) recovery special features ? point of load (pol) applications ? high efficiency, 3.3v@93% typ ? -40c to +85c ambient operati ng temperature ? open frame smt ? positive enable function ? low output ripple and noise ? regulation to zero load ? programmable output from 0.9v to 3.6v (external trim resistor) ? fixed frequency switching (400 khz) ? power good signal (optional) ? active current share (optional) safety designed to meet: ul, cul 60950 recognized tuv en60950 licensed
technical reference note (apc08) model: apc08 series sheet 2 of 23 august 9, 2002 - revision 02 apc08 series this specification covers the requirements for a new 1.3" x 0.53" x 0.33?(h) maximum 28w single output high efficiency non-isolated smt dc-dc converter model name sis code vin nominal/ vin range vout/iout apc08j03 apc08j03 3.3v / 1.8-6.0v 0.9v, 8a apc08k03 apc08k03 3.3v / 1.8-6.0v 1.2v, 8a apc08m03 apc08m03 3.3v / 1.8-6.0v 1.5v, 8a apc08y03 apc08y03 3.3v / 2.2-6.0v 1.8v, 8a apc08g03 apc08g03 3.3v / 3.0-6.0v 2.5v, 8a apc08f03 apc08f03 5.0v / 4.0-6.0v 3.3v, 8a apc08j08 apc08j08 8v / 5.0-12.0v 0.9v, 8a apc08k08 apc08k08 8v / 5.0-12.0v 1.2v, 8a apc08m08 apc08m08 8v / 5.0-12.0v 1.5v, 8a apc08y08 apc08y08 8v / 5.0-12.0v 1.8v, 8a apc08g08 apc08g08 8v / 5.0-12.0v 2.5v, 8a apc08f08 apc08f08 8v / 5.0-12.0v 3.3v, 8a options (suffix): "-9" = trim "-9ma" = trim with power good and active current share "-j" = jedec tray-type packaging
technical reference note (apc08) model: apc08 series sheet 3 of 23 august 9, 2002 - revision 02 electrical specifications standard test condition on a single unit, unless otherwise specified. t a : 25 c (ambient air) vin (p1): apc08x03 +1.8v to +6.0v apc08x08 +5 .0v to +12v enable (p5): open vo (p2): connect to load gnd (p3): return for vin and vo trim (p4): open pgood (p6): open p (p7): open absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. functional operation of the device is not implied at these or in any other conditions in excess of those given in the operational sections of the specs. exposure to absolute maximum ratings for extended periods can adversely affect device reliability . parameter device symbol min typ max unit input voltage continuous 03 v in 1.8 - 6.0 vdc transient (100ms) 03 v in,trans - - 7.0 vdc continuous 08 v in 5.0 - 13.0 vdc transient (100ms) 08 v in,trans - - 14.0 vdc operating temperature all t a -40 - 85 oc storage temperature all t stg -40 - 125 oc operating humidity all - - - 85 % input specifications parameter device symbol min typ max unit operating input voltage 1 03 v in 1.8 3.3 6.0 vdc 08 5.0 8.0 12.0 vdc maximum input current 2 (v in = 0 to v in,max ; i o = i o,max ) all i in,max - - 9.0 a input ripple current 5hz to 20mhz all i in-1 - 200 250 map-p note: 1. minimum v in (03 device) for 1v8, 2v5 and 3v3 versions are 2v2, 3v and 4v respectively. 2. this power module is not internally fused. the use of an input line fuse (03 version: gma-10a ; 08 version: gma-6a bussman fuses or equivalent) is recommended.
technical reference note (apc08) model: apc08 series sheet 4 of 23 august 9, 2002 - revision 02 output specifications parameter device symbol min typ max unit output voltage setpoint apc08j03 v o,set 0.873 0.9 0.927 vdc (v in =v in,min to v in,max at apc08k03 v o,set 1.164 1.2 1.236 vdc i o =i o,max ) 1 apc08m03 v o,set 1.455 1.5 1.545 vdc apc08y03 v o,set 1.746 1.8 1.854 vdc apc08g03 v o,set 2.425 2.5 2.575 vdc apc08f03 v o,set 3.200 3.3 3.400 vdc apc08j08 v o,set 0.873 0.9 0.927 vdc apc08k08 v o,set 1.164 1.2 1.236 vdc apc08m08 v o,set 1.455 1.5 1.545 vdc apc08y08 v o,set 1.746 1.8 1.854 vdc apc08g08 v o,set 2.425 2.5 2.575 vdc apc0 8f08 v o,set 3.200 3.3 3.400 vdc output regulation: line: v in =v in,min to v in,max all - - - 0.5 % load: i o =i o,min to i o,max all - - - 0.5 % temp: t a = -40 c to 85 c all - - - 1.5 % output ripple and noise peak to peak: 5hz to 20mhz 3 2.5v - - - 75 mv pk-pk < 2.5v - - - 50 mv pk-pk output current range all i o 0 - 8 a external load capacitance all - - - 500 m f capacitor esr - - 100 - m w output current limit inception 3 all i o - 11.5 - a output short circuit current 4 all - - - - efficiency v in = 1.8v to 6v 1 apc08j03 h 74 76 - % i o = 8a resistive load apc08k03 h 80 81 - % apc08m03 h 83 86 - % see figures 7 -12 for related apc08y03 h 85 88 - % curves at dif ferent input ranges apc08g03 h 89 91 - % apc08f03 h 90 93 - % note: 3. this feature is only for module protection and is not intended for customer application. the value is specified at 25c ambient air temperature. for other ambient air tem perature, please refer to thermal derating curve to determine corresponding current-limit inception values. 4. pulse train with 90 ms period and 1ms pulse width. average iout equals about zero.
technical reference note (apc08) model: apc08 series sheet 5 of 23 august 9, 2002 - revision 02 output specifications ( continued ) parameter device symbol min typ max unit efficiency ( continued ) v in = 6v to 12v apc08j08 h 71 76 - % i o = 8a resistive load apc08k08 h 75 81 - % apc08m08 h 77 84 - % apc08y08 h 81 86 - % apc08g08 h 85 90 - % apc08f08 h 87 92 - % switching frequency all - - 400 - khz dynamic response: slew rate all d i o / d t - 0.1 - a/ m s load change: 50% - 75% i o ,max all - - 5 10 %v o peak deviation settling time all - - 500 - m s to v o,nom load change: 50% to 25% i o,ma x all - - 5 10 %v o peak deviation settling time all - - 500 - m s to v o,nom turn-on time (input to output) 5 all - - - 50 ms i o = 8a; v in = v in,nom output voltage overshoot passive resistive full load all - - 5 - %v o note: 5. input to output turn-on time is defined as the difference between t1 and t2: where t1 is the time when the input voltage reaches the minimum v in (v in = v in ,min ) and t2 is the time when the output voltage reaches it's specified range (v o = v o,set-min ).
technical reference note (apc08) model: apc08 series sheet 6 of 23 august 9, 2002 - revision 02 feature specification parameter device symbol min typ max unit output voltage adjustment range 6 -9 opt v o - 3.6 v module parallel capability -9ma 40 - 60 %i o power good 7 open collector max sink current all - - 5 ma max pull-up voltage - - 6 v condition pg low 90%v o,set-min > v o > 110%v o,set-max all pg low 0 - 250 m w 90%v o,set-min v o 100%v o,set-max all pg high 100 - - k w output enable 8 m odule on: logic high all > 4.1 - 14 vdc module off: logic low all 0 - 0.8 vdc enable source current at logic low all - - 60 m a note: 6. there are two methods applicable to be able to trim the output voltage. please refer to related sections under feature specification. 7. see figure 6 for pgood configuration 8. refer to further notes under feature specification for the enable pin function. isolation specification - the apc08 series are non isolated units. safety appro val - ul / cul 60950, and tuv en60950 - flammability and temp rise only.
technical reference note (apc08) model: apc08 series sheet 7 of 23 august 9, 2002 - revision 02 basic operation and features the apc08 family was designed specifically to address applications where on board distributed power with point-of-load converters (conversion needed as close to the ic, usually dsp?s and asic?s) is employed. with its wide range input and flexible programmable output, any change in the load becomes very manageable with little to no impact on time to market. all of the converters in this family are buck converters. the apc08x03 versions allow 1.8v to 6v input voltage and the apc08x08 versions allow a 5v to 12v input with 14v max surge. module pin assignment there are 4 to 7 surface mount pins on a centauri module. the availability of pins from individual modules is relevant to its version / selected option. pin # designation p1 v in input voltage p2 v o output voltage p3 gnd common ground p4 trim output voltage adjustment [option] p5 enable output voltage enable p6 pgood power good [option] p7 p load current active sharing [option] industry standard pinout when ordered with no options, the module comes with only 4 pins ? vin, gnd, vout and enable ? and is compatible with other leading manufacturer?s footprint. the pgood, active current share, and trim pins are options that can be ordered with any model number. for the optional trim function add a (-9) to the end of the standard part number. for the optional current share and pgood signal in addition to the trim function, add (- 9ma) to the end of the part number. please refer to the part number ordering scheme section. note: when using the trim function, this module offers much more trim flexibility than the competitive footprint and also requires a jumper between the two footprints to be source compatible. contact factory for applications note. figure 1. pin assignment viewed from top of board. curr ent v in share enable trim gnd v o pgood
technical reference note (apc08) model: apc08 series sheet 8 of 23 august 9, 2002 - revision 02 typical application circuit (standard pinout) recommended c1 is a low esr (<100 mohms) 100 f tantalum and c2 is a 1 f ceramic or equivalent. recommended output decoupling capacitor c3 is 1 f. figure 2. typical application circuit. enable pin (standard configuration) pin p5 is functioned to enable the output voltage of a module. if this pin is left open or connected to > 4.1vdc up to 14vdc, the module is turned on. on the other hand, if this pin is connected to ground or to a voltage potential from 0 to 0.8vdc, the module is turned off. the enable pin can source current up to 60 m a max - suited for typical open-collector transistors readily available in the market. for ttl compatibility, figure 3 shows a 7405 open collector inverter ic utilized to function the enable feature. other common chips that can do the function are 74s05; 74hct05; non-inverting - 7407; 74s07; 74hc07. if smt packaging is preferred, fairchild's tiny logic nc7sz05 or ti's little logic sn7slvc1g06 comes in sot23 or sc70 packages. special feature pins (options): trim function (-9): pin p4 is used for output voltage adjustment. the output voltage can be trimmed through an external resistor or through an external dc supply as described in the succeeding sections. method 1: external trim resistor . by connecting an external resistor across p4 and p3 (gnd), the voltage appearing on pin p2 (vo) is adjusted to a higher value. the output voltage of a module can be adjusted up to a maximum value of 3.3v (nominal) or 83% of the input voltage, whichever is lower. by connecting an external resistor across p4 and p2, vo is adjusted to a lower value. only small reductions, 2%, in voltage are recommended, as adjustment to lower voltages tends to affect the loop compensation of the module. figure 3. output voltage enable function diagram.
technical reference note (apc08) model: apc08 series sheet 9 of 23 august 9, 2002 - revision 02 full range adjustment (from 0.9v to 3.6v) can be obtained from a module with the lowest vo setpoint (0.9vo). to adjust vo to a higher value , please refer to figure 4. the required resistor value ( rt) can be determined through equation (1) where vo is the voltage on p2 before the adjustment and vot is the voltage of p2 after rt is connected. 1 r vo vot vref rt - = equation (1) please refer to related constants given in table 1 to calculate the equation. table 1. constants version 0.9v 1.2v 1.5v 1.8v 2.5v 3.3v r1 apc08x03 r2 97.6k 8.45k 4.32k 2.94k 1.69k 1.13k 3.09k apc08x08 r2 210k 17.4k 9.09k 6.04k 3.48k 2.32k 6.49k v r / v ref 0.87v be aware that the maximum vo allowed is 3.6v. please refer to centauri datasheet. example: module version: apc08j03-9 (1.8 to 6.0vin, 0.9vo). requiring to adjust output voltage from vo = 0.9v to vot = 1.8v. v ref = 0.875v and r 1 = 3.09k w (from table 1). based on equation (1), rt can be determined as 3.0k w . to adjust vo to a lower value , rt should be connected between p4 and p2. equation (2) provides the calculation for rt. 2 ) ( ) )( ( r v v v v v v v rt ot o ref ref ot ref o - - - = equation (2) be aware that the minimum vo is 0.9v. example module version: apc08f03-9 (4.0 to 6.vin, 3.3vo). requiring to adjust the output voltage from vo = 3.3v to vot = 3.3 (1-0.02) = 3.234v. vo = 3.3v, vot = 3.234v, v ref = 0.875v, r 2 = 1.13k w (from table 1). based on equation (1), rt can be determined as 111.9k w . figure 4. output voltage trim setup.
technical reference note (apc08) model: apc08 series sheet 10 of 23 august 9, 2002 - revision 02 trim function (continued) method 2: external dc source by connecting an external dc supply across p4 (enable) and p3 (gnd) through a limiting resistor rt, (see figure 5), output voltage adjustment can also be achieved. equation 3 provides the relationship between the external dc supply, vt, and vo (where vo is the desired output voltage). given: rt = 10k w vo adjustment to lower voltages . this method does not limit the recommended lower vo adjustment to 2% as mentioned on previous sections re: vo adjustment through external trim resistor. example: module version: apc08g03-9 (3v to 6vin, 2.5vo). requiring to adjust the output voltage from vo = 2.5v to 1.8v vo = 1.8v, v r = 0.87v, r 1 = 3.09k w , r 2 = 1.69k w (from table 1). based on equation (3), vt = 3.0v. example: module version: apc08g03-9 (3v to 6vin, 2.5vo). requiring to adjust the output voltage from vo = 2.5v to 0.9v vo = 0.9v, v r = 0.87v, r 1 = 3.09k w , r 2 = 1.69k w (from table 1). based on equation (3), vt = 5.9v. vo adjustment to higher voltages example: module version: apc08g03-9 (3v to 6vin, 2.5vo). requiring to adjust the output voltage from vo = 2.5v to 3.3v vo = 3.3v, v r = 0.87v, r 1 = 3.09k w , r 2 = 1.69k w (from table 1). based on equation (3), vt = -1.84v. if application of negative voltage is not desired, the limiting resistor rt can either be changed to a lower value ( rt = 1k w w , such that vt = 0.60v per equation 3), or use method 1. vo r rt vr r rt r rt vt 1 2 1 1 - ? ? ? ? + + = equation (3) figure 5. external dc source for output trim adjust.
technical reference note (apc08) model: apc08 series sheet 11 of 23 august 9, 2002 - revision 02 power good signal operation (option (-9ma)): pg pin provides an output signal indicating the vout is operational (ttl logic signal). it can sink current up to a max of 5ma and can have a maximum external pull-up voltage of 6v. please see recommended setup shown on figure 6. active current share operation (option (-9ma)): active current share pin is compatible with apc08 modules only. connecting this pin directly with the same pin from another module guarantees current sharing to within 40% to 60% iout. note that this pin is not compatible with competitive modules that employ active current sharing. to attain efficient current sharing between like modules, the following points are recommended: a) the modules to be shared should be located as close as possible into the host card. b) the copper tracks that connect vo and gnd should at least be 0.60" in width with at least 2 oz. cu. figure 6. pgood setup.
technical reference note (apc08) model: apc08 series sheet 12 of 23 august 9, 2002 - revision 02 performance curves - efficiency figure 7. apc08f03 efficiency curve. figure 8. apc08g03 efficiency curve. figure 9. apc08y03 efficiency curve. figure 10. apc08m03 efficiency curve. figure 11. apc08k03 efficiency curve. figure 12. apc08j03 efficiency curve. 1v8 efficiency vs load current @ ta = 25 deg c 60 65 70 75 80 85 90 95 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%} 2.2vin 3.3vin 6vin 1.5v efficiency vs load current @ ta = 25 deg c 60 65 70 75 80 85 90 95 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 1.8vin 3.3vin 6vin 1v2 efficiency vs load current @ ta = 25 deg c 55 60 65 70 75 80 85 90 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 1.8vin 3.3vin 6vin 0.9v efficiency vs load current @ ta = 25 deg c 50 55 60 65 70 75 80 85 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 1.8vin 3.3vin 6vin 3.3v efficiency vs load current @ ta = 25 deg c 60 65 70 75 80 85 90 95 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 4vin 5vin 6vin 2.5v efficiency vs load current @ ta = 25 deg c 60 65 70 75 80 85 90 95 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 3vin 3.3vin 6vin
technical reference note (apc08) model: apc08 series sheet 13 of 23 august 9, 2002 - revision 02 performance curves - efficiency ( continued) 3.3v efficiency vs load current @ ta = 25 deg c 30 40 50 60 70 80 90 100 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin 2.5v efficiency vs load current @ ta = 25 deg c 30 40 50 60 70 80 90 100 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin figure 13. apc08f08 efficiency curve. figure 14. apc08g08 efficiency curve. 1.8v efficiency vs load current @ ta = 25 deg c 30 40 50 60 70 80 90 100 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin 1.5v efficiency vs load current ta = 25 deg c 20 30 40 50 60 70 80 90 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin figure 15. apc08y08 efficiency curve. figure 16. apc08m08 efficiency curve. 1.2v efficiency vs load current @ ta = 25 deg c 20 30 40 50 60 70 80 90 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin 0.9v efficiency vs load current @ ta = 25 deg c 20 30 40 50 60 70 80 90 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 load current [amp] efficiency [%] 12vin 6vin figure 17. apc08k08 efficiency curve. figure 18. apc08j08 efficiency curve.
technical reference note (apc08) model: apc08 series sheet 14 of 23 august 9, 2002 - revision 02 performance curves - thermal derating curve 3.3v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm 2.5v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm figure 19. apc08f03 thermal derating curve. figure 20. apc08g03 thermal derating curve. figure 21. apc08y03 thermal derating curve. figure 22. apc08m03 thermal derating curve. 1.2v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm 1.8v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm 0.9v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm figure 23. apc08k03 thermal derating curve. figure 24. apc08j03 thermal derating curve. 1.5v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [ c] load current [amp] 0 lfm 400 lfm
technical reference note (apc08) model: apc08 series sheet 15 of 23 august 9, 2002 - revision 02 performance curve - thermal derating ( continued) 3.3v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) 2.5v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) figure 25. apc08f08 thermal derating curve. figure 26. apc08g08 thermal derating curve. 1.5v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) figure 27. apc08y08 thermal derating curve. figure 28. apc08m08 thermal derating curve. 1.8v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) 0.9v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) 1.2v derating 0 1 2 3 4 5 6 7 8 9 25 35 45 55 65 75 85 ambient temperature [c] load current [amp] 12vin (0 lfm) 12vin (400 lfm) 6vin (0 lfm) 6vin (400 lfm) figure 29. apc08k08 thermal derating curve. figure 30. apc08j08 thermal derating curve.
technical reference note (apc08) model: apc08 series sheet 16 of 23 august 9, 2002 - revision 02 performance curves typical performance curves, t on delay, at 25 c ambient temperature; i o = i o ,max , vin = v in,max . for reference ch1 is connected to +v in pin, ch2 is connected to the output of the module. figure 31. apc08f03 t on delay at v in ,max = 6v. figure 32. apc08g03 t on delay at v in ,max = 6v. figure 33. apc08y03 t on delay at v in ,max = 6v. figure 34. apc08m03 t on delay at v in ,max = 6v. figure 35. apc08k03 t on delay at v in ,max = 6v. figure 36. apc08j03 t on delay at v in ,max = 6v.
technical reference note (apc08) model: apc08 series sheet 17 of 23 august 9, 2002 - revision 02 performance curves (continued) figure 37. apc08f08 t on delay at v in ,max = 12v. figure 38. apc08g08 t on delay at v in ,max = 12v. figure 39. apc08y08 t on delay at v in ,max = 12v (ch1) figure 40. apc08m08 t on delay at v in ,max = 12v. figure 41. apc08k08 t on delay at v in ,max = 12v. figure 42. apc08j08 t on delay at v in ,max = 12v.
technical reference note (apc08) model: apc08 series sheet 18 of 23 august 9, 2002 - revision 02 young?s stability curves gain margin _______ 0db ______ 10db ______ 20db ______ 30db ______ 40db ______ 50db 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 6 1 . 10 7 1 . 10 6 1 . 10 5 1 . 10 4 1 . 10 3 0.01 0.1 1 10 frequency impedance magnitude ohms 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 6 200 150 100 50 0 50 100 150 200 frequency phase figure 43. ysc- gain margin response to determine system stability at other load condition.
technical reference note (apc08) model: apc08 series sheet 19 of 23 august 9, 2002 - revision 02 young?s stability curves phase margin 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 6 1 . 10 4 1 . 10 3 0.01 0.1 1 10 impedance magnitude ( ohms ) 100 1 . 10 3 1 . 10 4 1 . 10 5 1 . 10 6 150 100 50 0 50 frequency impedance phase angle ( degrees ) ________ 0 _______ 15 _______ 30 _______ 45 _______ 60 _______ 75 _______90 figure 44. ysc - phase margin response to determine system stability at other load conditions.
technical reference note (apc08) model: apc08 series sheet 20 of 23 august 9, 2002 - revision 02 mechanical specifications outline drawing parameter device symbol min typ max unit dimension all l - - 1.300 (33.02) in (mm) w - - 0.530 (13.46) in (mm) h - - 0.290 ( 7.36) in (mm) weight all - - 5 (0.16) 10 (0.32) g (oz) recommended pick-up point pind / pin dimension nominal pin dimension 0.055 x 0.102 [in] suggested pad dimensions 0.070 x 0.110 [in] figure 46. mechanical outline (in inches). typical figure 45. pad layout outline (in mm).
technical reference note (apc08) model: apc08 series sheet 21 of 23 august 9, 2002 - revision 02 recommended location for pick and place the flat top surface of the large inductor (topside of the board) provides a versatile and convenient way of picking up the module (see figure 46). a 6-7mm outside diameter nozzle from a conventional smd machine is recommended to attain maximum vacuum pick-up. nozzle travel and rotation speed should be controlled to prevent this off-centered picked-up module from falling off the nozzle. the use of vision recognition systems for placement accuracy will be very helpful. reflow notes / recommendations 1. refer to the recommended reflow profile per figure 47. profile parameters exceeding the recommended maximums may result to permanent damage to the module. 2. the module is recommended for topside reflow process to the host card. for other orientations, contact factory. 3. in the event that the module needs to be desoldered from the host card, some pins may be detached from the module. module markings / labels marking shall be permanent and legible. please refer to figure 48 for the module marking/ label detail. recommended reflow profile 0 20 40 60 80 100 120 140 160 180 200 220 240 0 30 60 90 120 150 180 210 240 270 300 time (seconds) temperature (deg c) pre-heat zone 120 - 180 sec reflow zone < 80 sec 110 c 183 c peak temperature 200 c - 230 c slope < 4 c /sec note 1 mmm model no fff option note 2 yyww year / work week d day of week pp nth panel of the day ll location in the panel note 3: barcode 6 & 7 characters / line code 128, 32cpi 0.070" height figure 48. module label apc08mmmfff yywwdppll ? ? - - ? ? figure 47. recommended reflow profile.
technical reference note (apc08) model: apc08 series sheet 22 of 23 august 9, 2002 - revision 02 packing and shipping standard packaging for the modules will be in tape and reel. jedec-style tray packaging is also available (add suffix "j" in pn). please refer to the ordering information. maximum number of modules in a reel is 300pcs. the tray can hold 33 modules max. please refer to figure 49 for the carrier dimensions. figure 49. tape/ pocket dimensions figure 50. jedec-style tray dimensions in mm. all dimensions are in mm
technical reference note (apc08) model: apc08 series sheet 23 of 23 august 9, 2002 - revision 02 part number coding scheme for ordering a p c 0 8 x 0 y - z x output voltage f = 3.3v m = 1.5v g = 2.5v k = 1.2v y = 1.8v j = 0.9v y input voltage range 3 : 1.8v to 6v 8 : 5v to 12v z options 9 : trim function 9ma : trim function plus pgood and current sharing j: adding a j suffix indicates jedec style tray packaging please call 1-888-41-astec for further inquiries or visit us at www.astecpower.com

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