for technical support and more information, see inside back cover or visit www.ti.com/powertrends standard application pin-out information pt4140 series24v 20 watt 24v input isolated dc-dc converter pt4140 -vout 3 24 5 1 +vout -vin +vin 6 voadj on/off pt series suffix (pt1234 x ) pin configuration horizontal through-hole a horizontal surface mount c ordering information (1) pt4141 = 3.3v/5a pt4142 = 5.0v/4a pt4143 = 12.0v/1.6a pt4144 = 15.0v/1.3a (1) pt4146 = 1.5v/5a (1) pt4147 = 1.8v/5a (1) pt4148 = 2.5v/5a * note: this product is the subject of one or more patents. other patents pending. (for dimensions and pc board layout, see package style 710.) pin function 1 remote (3) on/off 2-v in 3+v in 4-v out 5+v out 6v out adjust (3) ? wide input voltage range 18v to 40v ? 82% efficiency ? 1500 vdc isolation ? small footprint 1. 45 x 1.64 ? low profile 0.315 (8mm) ? adjustable output ? short circuit protection ? over temperature shutdown ? ul1950 recognized ? csa 22.2 950 certified ? designed to meet en60950 the pt4140 series of 24v isolated dc-dc converters advance the state-of-the-art for board- mounted converters by employing 850khz switching frequencies, planar magnetics, and surface-mount construction. these regulators are pin-compatible with power trends popular pt4100 series, and offer an improved power density (25 w atts/in 3 ) plus output voltage adjustment. they are designed for telecom, industrial, computer, medical, and other distributed power applications that require input-to-output isolation. specifications characteristics pt4140 series (t a = 25 c unless noted) symbols conditions min typ max units output current i o over v in range v o < 3.3v 0 5.0 (2) v o = 5v 0 4.0 (2) a v o = 12v 0 1.6 (2) on/off standby current i in standby v in = 24v, pin 1 = -v in 7 10ma short circuit current i sc v in = 24v 2xi omax a inrush current i ir v in = 24v @ i o max 1.0 a t ir on start-up 1.0 msec input voltage range v in over i o range 18.0 24.0 40.0 vdc output v oltage tolerance d v o over v in range, i o =i o max t a = -40c to +85c 1.0 2.0 %v o line regulation reg line over v in range @ i o max 0.5 1.0 %v o load regulation reg load 10% to 100% of i o max 0.5 1.0 %v o v o ripple/noise v n v in =24v, i o =i o max, v o > 5v 1.0 %v o v in =24v, i o =i o max, v o < 5v 50 mv pp transient response t tr 50% load change, v o > 5v 100 sec v o over/undershoot 3.0 %v o efficiency h v in =24v, i o =5a, v o =3.3v 78 v in =24v, i o =4a, v o =5v 82 % v in =24v, i o =1.6a, v o =12v 83 switching frequency ? o over v in and i o , v o 5v 800 850 900 khz v o >5v 600 650 700 maximum operating t a v in = 24v -40 +85 (2) c temperature range with 200 lfm airflow storage temperature t s -40 +110 c mechanical shock per mil-std- 883d, m ethod 20 02.3, 500 gs 1ms, half-sine, mounted to a fi xture mechanical vibration per mil-std- 883d, m ethod 20 07.2, 15gs 20-2000hz, soldered in a pc board weight 15 grams isolation 1500 v capacitance 1100 pf resistance 10 m w flammability materials meet ul 94v-0 remote on/off on open or 2.5 to 7.0 vdc above -v in off short or 0 to 0.8 vdc above -v in notes: (1) the maximumoutput current limits the power rating of the following devices to less than 20w:- pt4141 =16.5w; pt4146 =7.5w; pt4147 =9w; pt4148 =12.5w. (2) see safe operating area curves or contact the factory for the appropriate derating. (3) see application notes at end of section. slts120a (revised 2/15/2001)
for technical support and more information, see inside back cover or visit www.ti.com/powertrends typical characteristics note a: characteristic data has been developed from actual products tested at 25c. this data is considered typical data for the conver ter. note b: safe operating area curves represent conditions at which internal components are at or below manufacturers rated operating tem peratures. pt4142, 5.0 vdc (see note a) efficiency vs output current efficiency vs output current ripple vs output current ripple vs output current power dissipation vs output current power dissipation vs output current pt4141, 3.3 vdc (see note a) pt4143, 12.0 vdc (see note a) efficiency vs output current ripple vs output current power dissipation vs output current pt4140 series24v 20 watt 24v input isolated dc-dc converter 50 60 70 80 90 012345 iout (a) efficiency - % 18.0v 24.0v 36.0v v in 0 5 10 15 20 012345 iout (a) ripple - mv 36.0v 24.0v 18.0v v in 0 1 2 3 4 5 012345 iout (a) pd - watts 36.0v 24.0v 18.0v v in 50 60 70 80 90 01234 iout (a) efficiency - % 18.0v 24.0v 36.0v v in 0 5 10 15 20 01234 iout (a) ripple - mv 36.0v 24.0v 18.0v v in 0 1 2 3 4 5 01234 iout (a) pd - watts 36.0v 24.0v 18.0v v in 50 60 70 80 90 0 0.4 0.8 1.2 1.6 iout (a) efficiency - % 18.0v 24.0v 36.0v v in 0 10 20 30 40 0 0.4 0.8 1.2 1.6 iout (a) ripple - mv 36.0v 24.0v 18.0v v in 0 1 2 3 4 5 0 0.4 0.8 1.2 1.6 iout (a) pd - watts 36.0v 24.0v 18.0v v in 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 0.0 0.5 1.0 1.5 2.0 iout ( a ) ambient temperature (c ) 200lfm 120lfm 60lfm nat conv airflow 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 0.0 1.0 2.0 3.0 4.0 iout (a) ambient temperature ( c 200lfm 120lfm 60lfm nat conv airflow safe operating area (see note b) safe operating area (see note b) 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 0.0 1.0 2.0 3.0 4.0 5.0 iout (a) ambient temperature (c ) 200lfm 120lfm 60lfm nat conv airflow safe operating area (see note b)
application notes for technical support and more information, see inside back cover or visit www.ti.com/powertrends adjusting the output voltage of the pt4120/ pt4140 series of isolated dc-dc converters the factory pre-set output voltage of power trends pt4120 and pt4140 series of isolated dc-dc converters may be adjusted within a nominal 10% range. adjustment is made from the secondary side of the regulator 1 with a single external resistor. for the input voltage range specified in the data sheet table 1 gives the allowable adjustment range for each model, as v o (min) and v o (max). adjust up: an increase in the output voltage is obtained by adding a resistor, r2 between pin 6 (v o adjust), and pin 4 (-v out ). adjust down: add a resistor (r1) , between pin 6 (v o adjust) and pin 5 (+v out ). refer to figure 1 and table 2 for both the placement and value of the required resistor, (r1) or r2. notes: 1. the pt4120 and pt4140 series of dc-dc converters incorporate isolation between the v in and v o terminals. adjustment of the output voltage is made to the regulation circuit on the secondary or output side of the converter. 2. the maximum rated output power for this series is 20w. an increase in the output voltage may therefore require a corresponding reduction in the maximum output current ( see table 1 ). the revised maximum output current must be determined as follows:- i o (max) = 20 a, or 5a, whichever is less. v a where v a is the adjusted ouput voltage. 3. use only a single 1% resistor in either the (r1) or r2 location. place the resistor as close to the isr as possible. table 1 dc-dc converter adjustment range and formula parameters series pt # 48v bus pt4126 pt4127 pt4128 pt4121 pt4122 pt4123 pt4124 24v bus pt4146 pt4147 pt4148 pt4141 pt4142 pt4143 pt4144 max current 2 5a 5a 5a 5a 4a 1.6a 1.3a v o (nom) 1.5 1.8 2.5 3.3 5.0 12.0 15.0 va(min) 1.35 1.62 2.25 2.95 4.5 10.8 13.5 va(max) 1.65 1.98 2.75 3.65 5.5 13.2 16.5 v r 1.225 1.225 1.225 1.225 2.5 2.5 2.5 k o (vk w w w w w ) 67.07 69.7 64.2 69.3 125.2 139.8 137.6 r s (k w w w w w ) 43.2 110.0 187.0 187.0 187.0 110.0 90.9 figure 1 (r1) adj down r2 adj up +v in Cv in +v o Cv o pt4120/40 +v out Cvout +vin Cvin remote on/off v o (adj) 1 2 35 4 6 4. never connect capacitors to v o adjust. any capacitance added to the v o adjust control pin will affect the stability of the isr. the values of (r1) [adjust down], and r2 [adjust up], can also be calculated using the following formulas. (r1) = k o (v a C v r ) C r s k w v r (v o C v a ) r2 = k o C r s k w (v a C v o ) where v o = original output voltage v a = adjusted output voltage v r = reference voltage (table 1) k o = multiplier constant (table 1) r s = internal series resistance (table 1) pt4120/4140 series
for technical support and more information, see inside back cover or visit www.ti.com/powertrends application notes continued pt4122 pt4142 5.0vdc v a (reqd 4.5 (12.6)k w 4.55 (40.3)k w 4.6 (75.0)k w 4.65 (120.0)k w 4.7 (179.0)k w 4.75 (262.0)k w 4.8 (387.0)k w 4.85 (595.0)k w 4.9 (1.01)m w 4.95 5.0 5.05 5.1 1.06m w 5.15 645.0k w 5.2 437.0k w 5.25 312.0k w 5.3 229.0k w 5.35 169.0k w 5.4 125.0k w 5.45 90.2k w 5.5 62.4k w 48v bus pt4126 pt4127 pt4128 pt4121 24v bus pt4146 pt4147 pt4148 pt4141 v o (nom) 1.5vdc 1.8vdc 2.5vdc 3.3vdc v a (reqd) 1.35 (2.8)k w 1.4 (53.2)k w 1.45 (204.0)k w 1.5 1.55 1.3m w 1.6 627.0k w 1.65 404.0k w (51.7)k w 1.7 (161.0)k w 1.75 (489.0)k w 1.8 1.85 1.28m w 1.9 587.0k w 1.95 355.0k w 2.25 (26.5)k w 2.3 (92.9)k w 2.35 (203.0)k w 2.4 (425.0)k w 2.45 (1.09)m w 2.5 2.55 1.09m w 2.6 450.0k w 2.65 237.0k w 2.7 131.0k w 2.75 67.7k w 2.95 (90.7)k w 3.0 (146.0)k w 3.05 (224.0)k w 3.1 (341.0)k w 3.15 (536.0)k w 3.2 (926.0)k w 3.25 (2.09)m w 3.3 3.35 1.19m w 3.4 502.0k w 3.45 272.0k w 3.5 158.0k w 3.55 88.7k w 3.6 42.7k w 3.65 9.9k w table 2 dc-dc converter series adjustment resistor values series pt # r1 = (blue) r2 = black pt4123 pt4124 pt4143 pt4144 12.0vdc 15.0vdc v a (reqd) 10.8 (276.0)k w 11.0 (365.0)k w 11.2 (497.0)k w 11.4 (719.0)k w 11.6 (1.16)m w 11.8 12.0 12.2 588.0k w 12.4 239.0k w 12.6 123.0k w 12.8 64.6k w 13.0 29.7k w 13.2 6.4k w 13.5 (312.0)k w 13.6 (345.0)k w 13.8 (427.0)k w 14.0 (542.0)k w 14.2 (713.0)k w 14.4 (1.0)m w 14.6 (1.57)m w 14.8 15.0 15.2 597.0k w 15.4 253.0k w 15.6 138.0k w 15.8 81.0k w 16.0 46.6k w 16.5 0.8k w pt4120/4140 series
application notes for technical support and more information, see inside back cover or visit www.ti.com/ powertrends using the remote on/off function on the pt4120/ pt4140 series of isolated dc-dc converters for applications requiring output voltage on/off control, the pt4120/4140 series of dc-dc converters incorporate a remote on/off function. this function may be used in applica- tions that require battery conservation, power-up/shutdown sequencing, and/or to co-ordinate the power-up of the regulator for active in-rush current control. (see the related application note, an21). this function is provided by the remote on/off control, pin1. if pin 1 is left open-circuit, the converter provides a regulated output whenever a valid source voltage 3 is applied between +v in (pin 3), and Cv in (pin 2). applying a low-level ground signal 1 to pin 1 will disable the regulator output 5 . table 1 provides details of the threshold requirements for remote on/off pin. figure 1 shows how a discrete mosfet (q 1 ) 4 , may be referenced to the negative input voltage rail and used with this control input. table 1 inhibit control thresholds 2 parameter min max enable (v ih ) 2.5v (open circuit) 5 disable (v il ) C0.3v 0.8v notes: 1. the on/off control uses -v in (pin 2), the primary side of the converter as its ground reference. all voltages specified are with respect to -v in . 2. the on/off control internal circuitry is a high impedance 10 m a current source. the open-circuit voltage may be as high as 8.3vdc. 3. the pt4120/40 series incorporates an under voltage lockout (uvlo) function. this function automatically inhibits the converter output until there is sufficient input voltage for the converter to produce a regulated output. table 2 gives the applicable uvlo thresholds. table 2 uvlo thresholds 1/ series uvlo threshold v in range pt4120 31v typical 36 C 75v pt4140 15v typical 18 C 40v 4. the remote on/off input of the pt4120/40 series regulators must be controlled with an open-collector (or open-drain) discrete transistor or mosfet. do not use a pull-up resistor. 5. when the converter output is disabled, the current drawn from the input supply is typically reduced to 8ma (16ma maximum). 6. keep the on/off transition to less than 1ms. this prevents erratic operation of the isr, whereby the output voltage may drift un-regulated between 0v and the rated output during power-up. figure 1 turn-on time: the converter typically produces a fully regulated output voltage within 50ms after the application of power, or the removal of the low voltage signal from the remote on/off pin. the actual turn-on time will vary with the input voltage, output load, and the total amount of capacitance connected to the output. using the circuit of figure 1, figure 2 shows the typical output voltage and input current waveforms of a pt4121 after q 1 is turned off at time t = 0s. the waveform was measured with a 48vdc input voltage, and 4a resistive load. figure 2 +v in Cv in +v o Cv o pt4121 +vout Cvout +vin Cvin remote on/off v o (adj) 1 2 35 4 6 q1 bss138 inh note 2 pt4120/4140 series 0 5 10 15 20 25 30 35 40 45 50 t (milli - secs) v o (1v / div) i in (0.2a / div)
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