single output switching regulator +vin -vin on/off +vo adj. -vo block diagram more power high power density vout adj. low noise remote on/off wide range 3:1 high efficiency, wide input volt age range and low output noise define ids series of non-isolated, step-down, switching dc/dc converters. the 3.3v and 5v output devices are respectively up to 93% efficiency. all models are fully line and load regulated and maintain specified accuracy over the impressively wide input vo ltage ranges of 4.75 to 13.6v for 3.3v output, 6 to 16.5v for 5v output and 16 to 28v for 3.3v and 5v outputs. output ripple and noise are typically 30mv p-p. the high efficiency of the ids seri es eliminates the need for thermally conductive potting compound. devices are specified for full-power operation up to ambient temperatures of + 70] calculated mtbf (mil-hdbk-217f) is more than 1.5 million hours. these simple-to-use power converters have no minimum load requirements. they draw 1ma when unloaded and a mere 100ua in the standby mode (on/off control turns off). 3.3v models have an output voltage adj ustment range from 1.8 to 3.3v and 5v models are adjustable down to 3.0v. y standby current 100ua only y overload protection y step-down switching regulator y temperature performance -25] to +70] y low output noise y remote on/off control y low cost y mtbf > 1,500,000 hours y output current up to 2a y efficiency up to 93% key features 10w, step-down, single output dc/dc converters ids100 series
85 490 200 2000 5 ids122 83 45 331 200 2000 3.3 24 ( 16 ~ 28 ) ids121 93 27 896 200 2000 5 12 ( 6 ~ 16.5 ) ids112 92 21 1434 200 2000 3.3 5 ( 4.75 ~ 13.6 ) IDS101 % (typ.) ma (typ.) ma (typ.) ma ma vdc vdc @max. load @no load @max. load min. max. efficiency input current output current output voltage input voltage model number model selection guide free-air convection cooling % 95 --- humidity ] +125 -25 storage temperature ] +70 -25 ambient operating temperature unit max. min. conditions parameter environmental specifications exceeding the absolute maximum rati ngs of the unit could cause damage. these are not conti nuous operating ratings. mw 1500 --- internal power dissipation ] 235 --- lead temperature (1.5mm from case for 10 sec.) vdc 30 -0.7 24vdc input models vdc 25 -0.7 12vdc input models vdc 16 -0.7 5vdc input models input surge voltage ( 1000 ms ) unit max. min. parameter notes : 1. specifications typical at ta=+25], resistive load, nominal input voltage, rated output current unless otherwise noted. 2. transient recovery time is measured to within 1% error band for a step change in output load of 50% to 100%. 3. ripple & noise measurement bandwidth is 0-20 mhz. 4. these power converte rs require a minimum output loading to maintain specified regulation. 5. operation under no-load conditions will not damage these modules; however, they may not meet all specifications listed. 6. all dc/dc converters s hould be externally fused at the front end for protection. 7. other input and output voltage may be available, please contact factory. 8. specifications subjec t to change without notice. absolute maximum ratings 15 --- 12 24v input models 6 --- 5.5 12v input models vdc 3.9 --- 3.5 5v input models start voltage unit max. typ. min. model parameter input specifications ids100 series
continuous output short circuit %/] {0.02 {0.01 --- temperature coefficient % {4 {2 --- transient response deviation us 150 100 --- 50% load step change transient recovery time % --- --- 120 over load mv rms 15 --- --- ripple & noise (20mhz) mv p-p 120 --- --- over line, load & temp. ripple & noise (20mhz) mv p-p 50 30 --- ripple & noise (20mhz) % {1.5 {0.5 --- io=0% to 100% load regulation % {0.5 {0.2 --- vin=min. to max. line regulation % {2.0 {1.0 --- output voltage accuracy unit max. typ. min. conditions parameter output specifications k hours --- --- 1500 mil-hdbk-217f @ 25], ground benign mtbf khz --- 300 --- switching frequency none isolation voltage unit max. typ. min. conditions parameter general specifications referenced to negative input control common ua -100 --- --- control input current ( off ) ua 50 --- --- control input current ( on ) ua 300 100 --- device standby input current vdc 1.2 --- -0.3 supply off vdc 3.0 to 5.0vdc or open circuit supply on unit max. typ. min. conditions parameter remote on/off control vdc 5 --- 3 ids112, ids122 vdc 3.3 --- 1.8 IDS101, ids121 trim down range unit max. typ. min. models parameter output voltage trim 1000ma slow - blow type 3000ma slow - blow type 4000ma slow - blow type 24v input models 12v input models 5v input models input fuse selection guide ids100 series
derating curve ?
test configurations peak-to-peak output noise measurement test use a cout 4.7uf ceramic capacitor. scope measurement should be made by using a bnc socket, measurement bandwidth is 0-20 mhz. position the load between 50 mm and 75 mm from the dc/dc converter. design & feature considerations remote on/off positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin, and off during a logic low. negative logic remote on/off turns the module off during a logic low and on during a logic high. to turn the power module on and off, the user must supply a switch to control the volt age between the on/off terminal and the -vin terminal. the switch can be an open collector or equivalent. a logic low is -0.3v to 1.2v. a logic high is 3.0v to 5.0v. the maximum sink current at on/off terminal during a logic low is -100 ua. the maximum allowable leakage cu rrent of the switch at on/off terminal (3.0 to 5.0v) is 50ua. overcurrent protection to provide protection in a f ault (output overload) condition, the unit is equipped with internal current limiting circuitry and can endure current limiting for an unlimited duration. at the point of current-limit incepti on, the unit shifts from voltage control to current control. t he unit operates normally once the output current is brought ba ck into its specified range. output ripple reduction a good quality low esr capacitor placed as close as practicable across the load will give the best ripple and noise performance. to reduce output ripple, it is recommended to use 22uf capacitors at the output. input source impedance the power module should be connected to a low ac-impedance input source. highly inductive source impedances can affect the st ability of the power module. in applications where power is supplied over long lines and output loading is high, it may be necessary to use a capacitor at the input to ensure startup. capacitor mounted close to the power module helps ensure stability of the unit, it is recommended to use a good quality low equivalent series resistance (esr < 1.0[ at 100 khz) capacitor of a 100uf for the 5v input devices and a 33uf for the 12v and 24v devices. output voltage trim connecting the external resi stor (radj) between the vadj and +vout pins decreases the output voltage to set the point as defined in the following equation: thermal considerations many conditions affect the thermal performance of the power module, such as orientat ion, airflow over the module and board spacing. to avoid exceeding the maximum temperature rating of t he components inside the power module, the ambient temperat ure must be kept below 70c. the derating curves are det ermined from measurements obtained in an exper imental apparatus. ids100 series +out -out +vin -vin single output dc / dc converter resistive load scope copper strip cout + +out -out +vin -vin dc / dc converter load dc power source + - cin +out -out +vin -vin load dc power source + - fuse on/off vadj radj IDS101 and ids121 ==>rx=2130[ output voltage range is 1.8-3.3vdc. ids112 and ids122==>rx=3840[ out p ut volta g e ran g e is 3.0-5.0vdc. vr1= (rx
leads are tin plated for improved solderability. 235] max./10sec : soldering temperature 8.6g : weight trim 5 +vout 4 acceleration 20g max. time 11 ms : shock -vin 3 +vin 2 10 to 55hz acceleration 2g remote on/off 1 5 to 10hz amplitude 10mm pk-pk : vibration function pin physical characteristics pin connections {0.002 {0.05 pin x.xxx{0.005 x.xx{0.13 x.xx{0.01 x.x{0.25 inches millimeters tolerance 20.2 [0.80] 21.5 [0.85] 24.0 [0.95] 3.5 [0.14] 0.8 [0.03] 8.3max [0.327max ] 2.54 [0.100] 0.25 [0.010] 12345 mechanical dimensions ids100 series
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