View TL5001L-S08-R_6664039.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

unisonic technologies co., ltd tl5001 linear integrated circuit www.unisonic.com.tw 1 of 13 copyright ? 2005 unisonic technologies co., ltd qw-r103-016,c pulse-width-modulation control circuits ? description the utc tl5001 incorporates on a single monolithic chip all the functions required for a pulse width modulation (pwm) control circuit. designed primarily for power-supply control, it contains an error amplifier, a regulator, an oscillator, a pwm comparator with a dead-time-control input, undervoltage lockout (uvlo), short-circuit protection (scp), and an open-collector output transistor. the error-amplifier common-mode voltage ranges from 0v to 1.5v. the noninverting input of the error amplifier is connected to a 1-v reference. dead-time control (dtc) can be set to provide 0% to 100% dead time by connecting an external resistor between dtc and gnd. the oscillator frequency is set by terminating rt with an external resistor to gnd. during low vcc conditions, the uvlo circuit turns the output off until v cc recovers to its normal operating range. ? features *complete pwm power control *3.6-v to 40-v operation *internal under voltage-lockout circuit *internal short-circuit protection *oscillator frequency : 20khz to 500khz *variable dead timer provides control over total range *pb-free plating product number: tl5001l ? ordering information ordering number normal lead free plating package packing tl5001-d08-t tl5001l-d08-t dip-8 tube tl5001-s08-r TL5001L-S08-R sop-8 tape reel tl5001-s08-t tl5001l-s08-t sop-8 tube
tl5001 linear integrated circuit unisonic technologies co., ltd 2 of 13 www.unisonic.com.tw qw-r103-016,c ? pin configuration
tl5001 linear integrated circuit unisonic technologies co., ltd 3 of 13 www.unisonic.com.tw qw-r103-016,c ? absolute maximum ratings parameter symbol ratings unit supply voltage (note 1) v cc 41 v amplifier input voltage v i(fb) 20 v output voltage v out 51 v output current i out 21 ma output peak current i o(peak) 100 ma continuous total power dissipation see dissipation rating table operating ambient te mperature range t opr -20 ~ +85 c storage temperature range t stg -65 ~ +150 c note: 1. all voltage values are with respect to the network ground terminal. 2. absolute maximum ratings are those val ues beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? dissipation rating table package t a 25 c power rating derating factor above t a =25 c t a =70 c power rating t a =70 c power rating t a =70 c power rating dip-8 1000mw 8.0mw/ c 640mw 520mw 200mw sop-8 725mw 5.8mw/ c 464mw 377mw 145mw ? recommended operating conditions parameter symbol min max unit supply voltage v cc 3.6 40 v amplifier input voltage v i(fb) 0 1.5 v output voltage v out 50 v output current i out 20 ma comp source current 45 ? a comp dc load resistance 100 k $ oscillator timing resistor rt 15 250 k $ oscillator frequency fosc 20 500 khz operating ambient te mperature range t a -20 85 c
tl5001 linear integrated circuit unisonic technologies co., ltd 4 of 13 www.unisonic.com.tw qw-r103-016,c ? electrical characteristics over recommended operating free-air temperature range (vcc=6v, fosc=100khz, all typical values at t a =25 c, unless otherwise noted) parameter symbol test conditions min typ max unit reference output voltage v out comp connected to fb 0.95 1 1.05 v input regulation vcc=3.6v ~ 40v 2 12.5 mv t a = -20 c ~ 25 c -10 -1 10 output voltage change with temperature t a = 25 c ~ 85 c -10 2 10 mv/v undervoltage lockout upper t a = 25 c 3 v lower t a = 25 c 2.8 v threshold voltage reset v thr t a = 25 c 2.1 2.55 v hysteresis t a = 25 c 100 200 mv short circuit protection scp threshold voltage t a = 25 c 0.95 1.00 1.05 v scp voltage, latched no pullup 140 185 230 mv scp voltage, uvlo standby no pullup 60 120 mv input source current t a = 25 c -10 -15 -20 a scp comparator 1 threshold voltage 1.5 v oscillator frequency f rt=100k ? 100 khz standard deviation of frequency 15 khz frequency change with voltage vcc=3.6v ~ 40v 1 khz t a = -40 c ~ 25 c -4 -0.4 4 khz t a = -20 c ~ 25 c -4 -0.4 4 khz frequency change with temperature t a = 25 c ~ 85 c -4 -0.2 4 khz voltage at rt v rt 1 v dead-time control output (source) current i o(source) v (dt) =1.5v 0.9*i rt (note) 1.1*i rt (note) a duty cycle=0% 0.5 0.7 input threshold voltage v i(thr) duty cycle=100% 1.3 1.5 v error amplifier input voltage v in vcc=3.6v ~ 40v 0 1.5 v input bias current i i(bias) -160 -500 na positive 1.5 2.3 v output voltage swing negative v o(sw) 0.3 0.4 v open-loop voltage amplification g v 80 db unity-gain bandwidth 1.5 mhz output (sink) current i o(sink) v i(fb) =1.2v, comp=1v 100 600 a output (source) current i o(source) v i(fb) =0.8v, comp=1v -45 -70 a output output saturation voltage v o(sat) i out =10ma 1.5 2 v v out =50v,vcc=0 10 off-state current i off v ou t=50v 10 a short-circuit output current i o(sc) v out =6v 40 ma total device standby supply current (off state) i stn-by 1 1.5 ma average supply current rt=100k ? 1.4 2.1 ma note: output source current at rt
tl5001 linear integrated circuit unisonic technologies co., ltd 5 of 13 www.unisonic.com.tw qw-r103-016,c ? schematic for typical application + + 1 2 3 4 5 6 7 8 v in v out v cc scp dtc rt fb comp v out utc tl5001 tsp1101 gnd ? functional block diagram 1 2 3 4 5 6 7 8 uvlo osc reference voltage i dt v cc dtc rt out gnd pwm/dtc comparator scp comparator 2 scp comparator 1 error amplifier scp fb comp + - 1v 1.5v 2.5v 1v
tl5001 linear integrated circuit unisonic technologies co., ltd 6 of 13 www.unisonic.com.tw qw-r103-016,c ? detailed description voltage reference a 2.5-v regulator operating from vcc is used to power t he internal circuitry of the tl5001 and as a reference for the error amplifier and scp circuit. a resistive divider provi des a 1-v reference for the error amplifier non-inverting input which typically is within 2% of nomi nal over the operati ng temperature range. error amplifier the error amplifier compares a sample of the dc-to-dc c onverter output voltage to the 1-v reference and generates an error signal for the pwm comparator. the dc-to-dc conver ter output voltage is set by selecting the error ?amplifier gain (see figure 1), using the following expression. v out =(1+r1/r2) (1v) + - fb comp gnd v i(fb) r1 r2 v ref =1v to pwm comparator compensation network 3 4 8 figure 1.error-amplifier gain setting the error-amplifier output is br ought out as comp for use in compensating the dc-to-dc converter control loop for stability. because the ampl ifier can only source 45 a, the total dc load resistance should be 100k ? or more. oscillator/pwm the oscillator frequency (fosc) can be set between 20khz and 500khz by connecting a resistor between rt and gnd .acceptable resistor values range from 15 k ? to 250 k ? . the oscillator frequency can be determined by using the graph shown in figure 5. the oscillator output is a triangular wave with a mini mum value of approximately 0.7v and a maximum value of approximately 1.3v. the pwm comparator compares the error-amplifier output voltage and the dtc input voltage to the triangular wave and turns the output transistor off whenev er the triangular wave is greater than the lesser of the two inputs.
tl5001 linear integrated circuit unisonic technologies co., ltd 7 of 13 www.unisonic.com.tw qw-r103-016,c ? detailed description(cont.) dead time contorl (dtc) dtc provides a means of limit ing the output-switch duty cycle to a value less than 100%, which is critical for boost and flyback converters. a current source generates a referenc e current (idt) at dtc that is nominally equal to the current at the oscillator timing terminal, rt. connecti ng a resistor between dtc and gnd generates a dead-time reference voltage (vdt), which the pwm/ dtc comparator compares to the osc illator triangle wave as described in the previous section. nominally, the maximum duty cycle is 0% when vdt is 0.7v or less and 100% when vdt is 1.3v or greater. because the triangle wave amplitude is a function of frequency and the source impedance of rt is relatively high(1250 ? ),choosing rdt for a specific maximum duty cycle, d, is accomplished using the following equation and the voltage limits for the frequency in ques tion as found in figure 11(voscmax and voscmin are the maximum and minimum os cillator levels): r dt =(rt +1250)[d(vosc max-vosc min)+vosc min] where r dt and rt are in ohms, d in decimal soft start can be implemented by parallelin g the dtc resistor with a capacitor (c dt ) as shown in figure 2. during soft start, the voltage at dtc is der ived by the following equation: v dt i dt r dt (1-e (-t/rdtcdt) ) utc tl5001 r dt c dt dtc 6 figure 2. soft- start circuit if the dc-to-dc converter must be in regulation within a specified period of time, the time constant, rdtcdt, should be t0/3 to t0/5.the utc tl5001 remains off unit vdt 0.7v, the minimum ramp value. cdt is discharged every time uvlo or scp becomes active. undervoltage-lockout (uvlo) protection the undervoltage-lockout circuit turns the output transistor off and resets the scp latch whenever the supply voltage drops too low (a pproximately 3v at 25 ) for proper operation. a hysteres is voltage of 200mv eliminates false triggering on noise and chattering.
tl5001 linear integrated circuit unisonic technologies co., ltd 8 of 13 www.unisonic.com.tw qw-r103-016,c ? detailed description(cont.) short-circuit protection (scp) the utc tl5001 includes short-circuit protection (see figure 3) , which turns the power switch off to prevent damage when the converter output is s horted. when activated, the scp preven ts the switch from being turned on until the internal latching circuit is reset. the circuit is reset by reducing the input voltage until uvlo becomes active or until the scp terminal is pulled to ground externally. when a short circuit occurs, the error-amplifier output at comp rises to increase the power-switch duty cycle in an attempt to maintain the output voltage. scp comparator 1 starts an rc timi ng circuit when comp exceeds 1.5v.if the short is removed and the error-a mplifier output drops below 1.5v before time out, normal converter operation continues. if the fault is still present at the end of the time-out period, the time sets the latching circuit and turns off the utc tl5001 output transistor. 2.5v r scp 185k 0 12k 0 c scp scp from error amp 1.5v scp comparator 1 q2 q1 v ref =1v scp comparator 2 to output drive logic figure 3.scp circuit 5 the timer operates by charging an external capacitor (cscp),connected between the scp terminal and ground, towards 2.5v through a 185k ? resistor (rscp).the circuit begins charging from an initial volt age of approximately 185mv and times out when capacitor volt age reaches 1v.the output of scp com parator 2 then goes high, turns on q2,and latches the timer circuit. the expression for setti ng the scp time period is derived from the following equation: vscp =(2.5-0.185)(1-e -t/ )+0.185 where =rscpcscp the end of the time-out period, tscp, occurs when vscp=1v. solving for cscp yields: cscp=12.46*tscp where t is in seconds, c in f tscp must be much longer (generally 10 to 15 times) th an the converter start-up peri od or the converter will not start. output transistor the output of the utc tl5001 is an open-collector transistor with a maxi mum collector current rating of 21ma and a voltage rating of 51v.the output is turn ed on under the following conditions: the oscillator triangle wave is lower than both the dtc voltage and the error-amp lifier output voltage, t he uvlo circuit is inactive, and the short-circuit protection circuit is inactive.
tl5001 linear integrated circuit unisonic technologies co., ltd 9 of 13 www.unisonic.com.tw qw-r103-016,c ? parameter measurement information osc v cc out scp comparator 1 comp 2.3v 1.5v 3v 1v dtc pwm/dtc comparator scp comparator 2 scp scp timing period 0v note a:the waveforms show timing characteristics for an intermittent short circuit and a longer short circuit that is sufficien t to activate scp. figure 4. pwm timing diagram
tl5001 linear integrated circuit unisonic technologies co., ltd 10 of 13 www.unisonic.com.tw qw-r103-016,c ? application information notes: a. frequency = 200khz b. duty cycle = 90% max c. soft-start time constant (tc) = 5.6ms d. scp tc = 70msa figure 5. step-down converter v cc v out scp comp dtc rt gnd fb utc tl5001 2 1 3 4 8 7 6 5 + c1 100 0 f 10v gnd v in 5v r1 470 $ c3 0.1 0 f c4 1 0 f c4 0.1 0 f + r2 56k $ r3 43k $ c6 0.012 0 f r4 5.1k $ + l1 20 0 h q1 tps1101 cr1 mbrs140t3 c2 100 0 f 10v r5 7.50k $ 1% r6 3.24k $ 1% c7 0.0047 0 f r7 2.0k $ gnd 3.3v partial bill of materials: q1 tps1101 texas instruments l1 ctx20-1 or coiltronics 23 turns of #28 wire on micrometals no. t50-26b core c1 tpsd 107m010r0100 avx c2 tpsd 107m010r0100 avx cr1 mbrs 140t3 motorola
tl5001 linear integrated circuit unisonic technologies co., ltd 11 of 13 www.unisonic.com.tw qw-r103-016,c ? typical characteristics -25 25 75 -50 0 92 50 ambient temperature, t a( $
100 94 96 90 88 024 6 8 1 0.8 3 1 5 reference output voltage vs power -supply voltage reference output voltage, v ref (v) power-supply voltage, vcc (v) 10 1.2 7 1.4 9 2 0.4 0 0.2 0.6 1.8 1.6 10k 1m timing resistance, rt ( oscillator frequency vs timing resistance o s c i l l a t o r f r e q u e n c y , f o s c ( h z ) 100k 1m 10k 100k vcc=6v dt resistance=rt t a =25 $ 98 100 o s c i l l a t o r f r e q u e n c y , f o s c ( h z ) oscillator frequency vs ambient temperature vcc=6v dt resistance=100k rt=100k t a =25 $ fb and comp connected together -25 25 75 -50 0 -0.4 50 ambient temperature, t a( $
100 -0.2 0 -0.6 -0.8 0.2 0.4 r e f e r e n c e o u t p u t v o l t a g e f l u c t u a t i o n , v r e f ( % ) reference output voltage fluctuation vs ambient temperature vcc=6v fb and comp connected together 0.6 10 20 30 0 1 40 1.5 2 0.5 0 a v e r a g e s u p p l y c u r r e n t , i c c ( m a ) rt=100k t a =25 $ average supply current vs power -supply voltage power-supply voltage, vcc (v) -25 25 75 -50 0 0.9 50 ambient temperature, t a ( $
100 1 1.1 0.8 0 1.2 1.3 average supply current vs ambient temperature vcc=6v dt resistance=100k rt=100k a v e r a g e s u p p l y c u r r e n t , i c c ( m a )
tl5001 linear integrated circuit unisonic technologies co., ltd 12 of 13 www.unisonic.com.tw qw-r103-016,c ? typical characteristics(cont.) 00.2 1 0.4 output(sink)current, io ut (ma) 0.6 1.5 2 0.5 0 0 0.6 oscillator frequency, fosc (hz) pwm triangle wave amplitude voltage vs oscillator frequency 100k 1m 10k 0.3 2.5 3 e r r o r a m p l i f i e r o u t p u t v o l t a g e , v o u t ( v ) error amplifier output voltage vs output(sink)current -25 25 75 -50 0 2.42 50 ambient temperature, t a ( $
100 2.43 2.44 2.41 2.40 2.45 2.46 error amplifier output voltage vs ambient temperature -25 25 75 -50 0 160 50 ambient temperature, t a( c) 100 180 200 140 120 220 240 t r i a n c l e w a v e a m p l i t u d e v o l t a g e , p w m ( v ) 10m 0.9 1.2 1.5 1.8 v osc max(100% duty cycle) v osc min(zero duty cycle) vcc=6v t a =25 $ vcc=6v t a =25 c v i(fb) =1.2v 0 40 1 80 output(source)current, io ut (ua) 120 1.5 2 0.5 0 2.5 3 e r r o r a m p l i f i e r o u t p u t v o l t a g e , v o u t ( v ) error amplifier output voltage vs output(source)current 20 60 100 vcc=6v t a =25 c v i(fb) =0.8v v o - e r r o r a m p l i f i e r o u t p u t v o l t a g e - v vcc=6v v i(fb) =0.8v no load vcc=6v v i(fb) =1.2v no load e r r o r a m p l i f i e r o u t p u t v o l t a g e , v o u t ( v ) error amplifier output voltage vs ambient temperature -20 0 frequency, f(hz) error amplifier open-loop gain and phase shift vs frequency 100k 1m 10k -10 e r r o r a m p l i f i e r o p e n - l o o p g a i n , g v ( d b ) 10m 10 20 30 40 vcc=6v t a =25 $ gv -180 -210 -240 -270 -300 -330 -360 e r r o r a m p l i f i e r o p e n - l o o p g a i n , g v ( d b )
tl5001 linear integrated circuit unisonic technologies co., ltd 13 of 13 www.unisonic.com.tw qw-r103-016,c ? typical characteristics(cont.) 10 15 05 output(sink)current, io (sink) (ma) 20 1.5 0.5 0 2 output saturation voltage vs output (sink) current 0 -20 -20 -40 rt output current, io ut ( ? a) -60 -30 -40 -10 0 -50 -60 dtc output current vs rt output current -10 -30 -50 t a =25
dt voltage =1.3v o u t p u t s a t u r a t i o n v o l t a g e , v c e ( v ) 00.5 40 1 dtc voltage -v 1.5 60 80 20 0 100 120 o u t p u t d u t y c y c l e - % output duty cycle vs dtc voltage vcc=6v t a =25
rt =100 ? 2 20 60 100 040 4 80 cscp-scp capacitance -nf 120 6 8 2 0 10 12 t s c p - s c p t i m e - o u t p e r i o d - m s scp-time-output period vs scp capacitance vcc=6v t a =25
rt =100 ? dt resistance =200k ? dtc output current, io (dt) ( ? a) 1 vcc=6v t a =25
utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

▲Up To Search▲

Price & Availability of TL5001L-S08-R

	To Download TL5001L-S08-R Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .