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september 2010 doc id 17736 rev 2 1/25 25 VIPER26 fixed frequency viper tm plus family features 800 v avalanche rugged power section pwm operation with frequency jittering for low emi operating frequency: ? 60 khz for l type ? 115 khz for h type standby power < 50 mw at 265 v ac limiting current with adjustable set point on-board soft-start safe auto-restart after a fault condition hysteretic thermal shutdown application auxiliary power supp ly for appliances power metering led drivers smps for set-top boxes, dvd players and recorders description the device is an off-line converter with an 800 v avalanche ruggedness power section, a pwm controller, user defined overcurrent limit, protection against feedback network disconnection, hysteretic thermal protection, soft start up and safe auto restart after any fault condition. advance frequency jittering reduces emi filter cost. burst mode operation and the devices very low consumption both help to meet the standard set by energy saving regulations. figure 1. typical topology (v out v ddcson ) dip-7 so - 16 so16 narrow VIPER26 drain comp gnd fb lim vdd VIPER26 drain comp gnd fb lim vdd dc output voltage - dc input voltage table 1. device summary order codes package packaging VIPER26ln dip-7 tube VIPER26hn VIPER26hd so16 narrow tube VIPER26hdtr tape and reel VIPER26ld tube VIPER26ldtr tape and reel www.st.com
contents VIPER26 2/25 doc id 17736 rev 2 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.1 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical electrical character istics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 typical circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 high voltage current generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10 soft start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11 adjustable current limit set po int . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 12 fb pin and comp pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 13 burst mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 14 automatic auto restart after overload or short-circuit . . . . . . . . . . . . . 17 15 open loop failure protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 16 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 17 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
VIPER26 block diagram doc id 17736 rev 2 3/25 1 block diagram 2 typical power figure 2. block diagram table 2. typical power part number 230 v ac 85-265 v ac adapter (1) 1. typical continuous power in non vent ilated enclosed adapter measured at 50 c ambient. open frame (2) 2. maximum practical continuous pow er in an open frame design at 50 c ambient, with adequate heat sinking. adapter (1) open frame (2) VIPER26 18 w 20 w 10 w 12 w
pin settings VIPER26 4/25 doc id 17736 rev 2 3 pin settings figure 3. connection diagram (top view) note: the copper area for heat dissipation has to be designed under the drain pins. !-v .# .! table 3. pin description pin n. name function dip-7 so16 11-2gnd connected to the source of the inte rnal power mosfet and controller ground reference. -4n.a. not available for user. it can be connected to gnd (pins 1-2) or left not connected. 25vdd supply voltage of the control section. this pin provides the charging current of the external capacitor. 36lim this pin allows setting the drain current limitation. the limit can be reduced by connecting an external resistor between this pin and gnd. pin left open if default drain current limitation is used. 47fb inverting input of the internal trans conductance error amplifier. connecting the converter output to this pin through a single resistor results in an output voltage equal to the error amplifier reference voltage (see v fb_ref on table 7 ). an external resistors divider is required for higher output voltages. 58comp output of the internal trans conductan ce error amplifier. the compensation network have to be placed between this pin and gnd to achieve stability and good dynamic performance of the voltage control loop. the pin is used also to directly control the pwm with an optocoupler. the linear voltage range extends from v compl to v comph ( table 7 ). 7,8 13-16 drain high voltage drain pin. the built-in high voltage switched start-up bias current is drawn from this pin too. pins connected to the metal frame to facilitate heat dissipation.
VIPER26 electrical data doc id 17736 rev 2 5/25 4 electrical data 4.1 maximum ratings 4.2 thermal data table 4. absolute maximum ratings symbol pin (dip-7) parameter value unit min max v drain 7, 8 drain-to-source (ground) voltage 800 v e av 7, 8 repetitive avalanche energy (limited by t j = 150 c) 5 mj i ar 7, 8 repetitive avalanche current (limited by t j = 150 c) 1.5 a i drain 7, 8 pulse drain current (limited by t j = 150 c) 3 a v comp 5 input pin voltage -0.3 3.5 v v fb 4 input pin voltage -0.3 4.8 v v lim 3 input pin voltage -0.3 2.4 v v dd 2 supply voltage -0.3 self limited v i dd 2 input current 20 ma p tot power dissipation at t a < 40 c (dip-7) 1 w power dissipation at t a < 60 c (so16n) 1.5 w t j operating junction temperature range -40 150 c t stg storage temperature -55 150 c table 5. thermal data symbol parameter max value unit so16n dip-7 r thjp thermal resistance junction pin (dissipated power = 1 w) 25 35 c/w r thja thermal resistance junction ambient (dissipated power = 1 w) 60 100 c/w r thja thermal resistance junction ambient (1) (dissipated power = 1 w) 1. when mounted on a standard si ngle side fr4 board with 100 mm 2 (0.155 sq in) of cu (35 m thick) 50 80 c/w
electrical data VIPER26 6/25 doc id 17736 rev 2 4.3 electrical characteristics (t j = -25 to 125 c, v dd = 14 v (a) ; unless otherwise specified) a. adjust v dd above v ddon startup threshold before setting to 14 v table 6. power section symbol parameter test condition min typ max unit v bvdss break-down voltage i drain = 1 ma, v comp = gnd, t j = 25 c 800 v i off off state drain current v drain = max rating, v comp = gnd 60 a r ds(on) drain-source on state resistance i drain = 0.2 a, t j = 25 c 7 ? i drain = 0.2 a, t j = 125 c 14 ? c oss effective (energy related) output capacitance v drain = 0 to 640 v 40 pf table 7. supply section symbol parameter test condition min typ max unit voltag e v drain _start drain-source start voltage 60 80 100 v i ddch1 charging current during the start up v drain = 100 v to 640 v, v dd = 4 v -0.6 -1.8 ma i ddch2 charging current during the autorestart v drain = 100 v to 640 v, v dd = 9 v falling edge -7 -13 ma v dd operating voltage range 11.5 23.5 v v ddclamp v dd clamp voltage i dd = 15 ma 23.5 v v ddon v dd start up threshold 12 13 14 v v ddcson vdd on internal high voltage current generator threshold 9.5 10.5 11.5 v v ddoff v dd under voltage shutdown threshold 789v current i dd0 operating supply current, not switching f osc = 0 khz, v comp = gnd 0.6 ma i dd1 operating supply current, switching v drain = 120 v, f sw = 60 khz 2.5 ma v drain = 120 v, f sw = 115 khz 3.5 ma i ddoff operating supply current with v dd < v ddoff v dd < v ddoff 0.35 ma i ddol open loop failure current threshold v dd = v ddclamp v comp = 3.3 v, 4ma
VIPER26 electrical data doc id 17736 rev 2 7/25 table 8. controller section symbol parameter test condition min typ max unit error amplifier v ref_fb fb reference voltage 3.2 3.3 3.4 v i fb_pull up current pull up -1 a g m trans conductance 2 ma/v current setting (lim) pin v lim_low low level clamp voltage i lim = -100 a0.5v compensation (comp) pin v comph upper saturation limit t j = 25 c 3 v v compl burst mode threshold t j = 25 c 1 1.1 1.2 v v compl_hys burst mode hysteresis t j = 25 c 40 mv h comp ? v comp / ? i drain 3v/a r comp(dyn) dynamic resistance v fb = gnd 15 k ? i comp source / sink current v fb > 100 mv 150 a max source current v comp = gnd, v fb = gnd 220 a current limitation i dlim drain current limitation i lim = -10 a, v comp = 3.3 v, t j = 25 c 0.66 0.7 0.74 a t ss soft-start time 8.5 ms t on_min minimum turn on time 480 ns i dlim_bm burst mode current limitation v comp = v compl 145 ma overload t ovl overload time 50 ms t restart restart time after fault 1 s oscillator section f osc switching frequency VIPER26l 54 60 66 khz VIPER26h 103 115 127 khz f d modulation depth f osc = 60 khz 4 khz f osc = 115 khz 8 khz f m modulation frequency 230 hz d max maximum duty cycle 70 80 % thermal shutdown t sd thermal shutdown temperature 150 160 c t hyst thermal shutdown hysteresis 30 c
typical electrical characteristics VIPER26 8/25 doc id 17736 rev 2 5 typical electrical characteristics figure 4. idlim vs t j figure 5. f osc vs t j figure 6. v drain_start vs t j figure 7. h comp vs t j figure 8. g m vs t j figure 9. v ref_fb vs t j !-v ,'/,0,'/,0#& !-v )26&)26&#& !-v 9'5$,1b67$579'5$,1b67$57#& !-v +&203+&203#& !-v *0*0#& !-v 95()b)%95(b)%#&
VIPER26 typical electrical characteristics doc id 17736 rev 2 9/25 figure 10. i comp vs t j figure 11. operating supply current (no switching) vs t j figure 12. operating supply current (switching) vs t j figure 13. idlim vs r lim figure 14. power mosfet on-resistance vs t j figure 15. power mosfet break down voltage vs t j !-v ,&203,&203#& !-v ,'',''#& !-v ,'',''#& !-v ,'/,0,'/,0#.2kp !-v 5'6215'621#& !-v %9'66%9'66#&
typical circuits VIPER26 10/25 doc id 17736 rev 2 figure 16. thermal shutdown 6 typical circuits figure 17. buck converter (v out >v ddcson ) t j v dd i drain v ddon time v ddcson v ddoff t sd time time t sd - t hyst shut down after over temperature normal operation normal operation !-v # optional #comp 2fb , '2/5.$ 6/54 2fb '2/5.$ # # 2 # #out #fb $ ,out #/. 42 /, &" $2 !). '.$ 6$$ #/-0 ,)- 6)0%2 $out 2,)- $ 2comp $ !# ).
VIPER26 typical circuits doc id 17736 rev 2 11/25 figure 18. fly-back converter (isolated) figure 19. flyback conver ter (primary regulation) !-v # 2 6o ut )# 2ref # '2/5. $ 2c l '2/5. $ # $ #/.42/, &" $2!). '.$ 6$$ #/-0 ,)- 6)0%2 # # $ #c l 2 2 # 4 $ 2 !#). 2 $ , !#). # /04/ 2ref 2,)- 2 # !-v
typical circuits VIPER26 12/25 doc id 17736 rev 2 figure 20. flyback converter (non isolated, v out m v ddcson ) figure 21. flyback converter (non isolated, v out [ v ddcson ) !-v 6/54 #out # 2comp #cl #/.42/, &" $2!). '.$ 6$$ #/-0 ,)- 6)0%2 !#). 2cl $ 2fb !#). #comp 2,)- $out 2fb 2in $aux $in optional # # , #comp
VIPER26 power section doc id 17736 rev 2 13/25 7 power section the power section is implemented with an n-channel power mosfet with a breakdown voltage of 800 v min. and a typical r ds(on) of 7 ? . it includes a sensefet structure to allow a virtually lossless current sensing and the thermal sensor. the gate driver of the power mosfet is designed to supply a controlled gate current during both turn-on and turn-off in order to minimize common mode emi. during uvlo conditions, an internal pull-down circuit holds the gate low in order to ensure that the power mosfet cannot be turned on accidentally. 8 high voltage current generator the high voltage current generator is supplied by the drain pin. at the first start up of the converter, it is enabled when the voltage across the input bulk capacitor reaches the v drain_start threshold, sourcing the i ddch1 current (see table 7 on page 6 ); as the v dd voltage reaches the v ddon start-up threshold, the power section starts switching and the high voltage current generator is turned off. the VIPER26 is powered by the external source. after the start-up, the auxiliary winding or the diode connected to the output voltage have to power the vdd capacitor with voltage higher than v ddcson threshold (see table 7 on page 6 ). during the switching, the internal current source is disabled and the consumptions are minimized. in case of fault the switching is stopped and the device is self biased by the internal high voltage current source; it is activated between the levels v ddcson and v ddon delivering the current i ddch2 to the v dd capacitor during the mosfet off time, see figure 22 on page 13 . at converter power-down, the v dd voltage drops and the converter activity stops as it falls below v ddoff threshold (see table 7 on page 6 ). figure 22. power on and power off i dd v dd v drain v ddon time v in v drain_start power-on power-off normal operation regulation is lost here v in < v drain_start hv startup is no more activated v ddcson v ddoff i ddch1 i ddch2 time time time
oscillator VIPER26 14/25 doc id 17736 rev 2 9 oscillator the switching frequency is internally fixed at 60 khz (VIPER26ln or ld) or 115 khz (VIPER26hn or hd). in both cases the switching frequency is modulated by approximately 4 khz (60 khz version) or 8 khz (115 khz version) at 230 hz (typical) rate, so that the resulting spread- spectrum action distributes the energy of each harmonic of the switching frequency over a number of sideband harmonics having the same energy on the whole but smaller amplitudes. 10 soft start-up during the converters' start-up phase, the soft-start function progressively increases the cycle-by-cycle drain current limit, up to the default value i dlim . by this way the drain current is further limited and the output voltage is progressively increased reducing the stress on the secondary diode. the soft-start time is internally fixed to t ss , see typical value on table 8 on page 7 , and the function is activated for any attempt of converter start-up and after a fault event. this function helps prevent transformers' saturation during start-up and short-circuit. 11 adjustable current limit set point the VIPER26 includes a curren t mode pwm controller: cycle by cycle the drain current is sensed through the integrated resistor r sense and the voltage is applied to the non inverting input of the pwm comparator, see figure 2 on page 3 . as soon as the sensed voltage is equal to the voltage derived from the comp pin, the power mosfet is switched off. in parallel with the pwm operations, the comparator ocp, see figure 2 on page 3 , checks the level of the drain current and switch off the power mosfet in case the current is higher than the threshold i dlim , see table 8 on page 7 . the level of the drain current limit, i dlim , can be reduced depending from the sunk current from the pin lim. the resistor r lim , between lim and gnd pins, fixes the current sunk and than the level of the current limit, i dlim , see figure 13 on page 9 . when the lim pin is left open or if the r lim has an high value (i.e. > 80 k ? ) the current limit is fixed to its default value, i dlim , as reported on table 8 on page 7 .
VIPER26 fb pin and comp pin doc id 17736 rev 2 15/25 12 fb pin and comp pin the device can be used both in non-isolated and in isolated topology. in case of non- isolated topology, the feedback signal from th e output voltage is applied directly to the fb pin as inverting input of the internal error amplifier having the reference voltage, v ref_fb, see the table 8 on page 7 . the output of the error amplifier sources and sinks the current, i comp , respectively to and from the compensation network connected on th e comp pin. this signal is then compared, in the pwm comparator, with the signal coming from the sensefet; the power mosfet is switched off when the two values are the same on cycle by cycle basis. see the figure 2 on page 3 and the figure 23 on page 15 . when the power supply output voltage is equal to the error amplifier reference voltage, v ref_fb , a single resistor has to be connected from the output to the fb pin. for higher output voltages the external resistor divider is needed. if the voltage on fb pin is accidentally left floating, an internal pull-up protects the controller. the output of the error amplifier is externally accessible through the comp pin and it?s used for the loop compensation: usually an rc network. as reported on figure 23 on page 15 , in case of isolated power supply, the internal error amplifier has to be disabled (fb pin shorted to gnd). in this case an internal resistor is connected between an internal reference voltage and the comp pin, see the figure 23 on page 15 . the current loop has to be closed on the comp pin through the opto-transistor in parallel with the compensation network. the v comp dynamics ranges is between v compl and v comph as reported on figure 24 on page 16 . when the voltage v comp drops below the voltage threshold v compl , the converter enters burst mode, see section 13 on page 16 . when the voltage v comp rises above the v comph threshold, the peak drain current will reach its limit, as well as the deliverable output power figure 23. feedback circuit fb comp without isolation: switch open & e/a enabled with isolation: switch closed & e/a disabled no isolation v out + - pwm stop from r sense r isolation r l nr sw v ref r comp + - e/a bus + - to pwm v compl r h v ref_fb
burst mode VIPER26 16/25 doc id 17736 rev 2 13 burst mode when the voltage v comp drops below the threshold, v compl , the power mosfet is kept in off state and the consumption is reduced to i dd0 current, as reported on table 7 on page 6 . as reaction at the energy delivery stop, the v comp voltage increases and as soon as it exceeds the threshold v compl + v compl_hys , the converter starts switching again with consumption level equal to i dd1 current. this on-off operation mode, referred to as ?burst mode? and reported on figure 25 on page 16 , reduces the average frequency, which can go down even to a few hundreds hertz, thus minimizing all frequency-related losses and making it easier to comply with energy saving regulations. during the burst mode, the drain current limit is reduced to the value i dlim_bm (reported on table 8 on page 7 ) in order to avoid the audible noise issue. figure 25. load-dependent operating modes: timing diagrams figure 24. comp pin voltage versus i dlim !-v 9 &203 , '5$,1 , , 'olpbep 'olp 9 &203+ 9 &203/ time time time v comp v compl +v compl_hys v compl i dd1 i dd0 i dd i drain i dlim_bm burst mode
VIPER26 automatic auto restart after overload or short-circuit doc id 17736 rev 2 17/25 14 automatic auto restart after overload or short-circuit the overload protection is implemented in automatic way using the integrated up-down counter. every cycle, it is incremented or decremented depending if the current logic detects the limit condition or not. the limit condition is the peak drain current, i dlim , reported on table 8 on page 7 or the one set by the user through the r lim resistor, as reported in figure 13 on page 9 . after the reset of the counter, if the peak drain current is continuously equal to the level i dlim , the counter will be increment ed till the fixed time, t ovl , after that will be disabled the power mosfet switch on. it will be activated agai n, through the soft start, after the t restart time, see the figure 26 on page 17 and the mentioned time values on table 8 on page 7 . in case of overload or short-circuit event, the power mosfet switch ing will be stopped after a time that depends from the counter and that can be as maximum equal to t ovl . the protection will occur in the same way until the overload condition is removed, see figure 26 on page 17 . this protection ensures restart attempts of the converter with low repetition rate, so that it works safely with extremely low power throughput and avoiding the ic overheating in case of repeated overload events. if the overload is removed before the protec tion tripping, the coun ter will be decremented cycle by cycle down to zero and the ic will not be stopped. figure 26. timing diagram: olp sequence time time v dd v ddon v ddcson i drain i dlim_bm t 1 * * the time t 1 can be lower or equal to the time t ovl t restart t ss t ovl t restart t ss t ovl t restart t ss short circuit occurs here short circuit removed here
open loop failure protection VIPER26 18/25 doc id 17736 rev 2 15 open loop failure protection in case the power supply is built in fly-back topology and the VIPER26 is supplied by an auxiliary winding, as shown in figure 27 on page 18 and figure 28 on page 19 , the converter is protected against feedback loop failure or accidental disconnections of the winding. the following description is app licable for the schematics of figure 27 on page 18 and figure 28 on page 19 , respectively the non-isolated fly- back and the isolated fly-back. if r h is opened or r l is shorted, the VIPER26 works at its drain current limitation. the output voltage, v out , will increase and so th e auxiliary voltage, v aux , which is coupled with the output through th e secondary-to-auxiliary turns ratio. as the auxiliary voltage incr eases up to the internal v dd active clamp, v ddclamp (the value is reported on table 8 on page 7 ) and the clamp current injected on vdd pin exceeds the latch threshold, i ddol (the value is reported on table 8 on page 7 ), a fault signal is internally generated. in order to distinguish an act ual malfunction from a bad aux iliary winding de sign, both the above conditions (drain current equal to the drain current limitation and current higher than i ddol through vdd clamp) have to be verified to reveal the fault. if r l is opened or r h is shorted, the output voltage, v out , will be clamped to the reference voltage v ref_fb (in case of non isolated fly-back) or to the external tl voltage reference (in case of isolated fly-back). figure 27. fb pin connection for non-isolated fly-back 6 #/-0, $ !5 8 n2 &" 6$$ 6 !58 #/-0 to07- 2 , %! 2 ( 2 2 !58 # 6$$ 6 /54 2s 6 2%&?&" from2 3%.3% #s #p "53 07-stop
VIPER26 open loop failure protection doc id 17736 rev 2 19/25 figure 28. fb pin connection for isolated fly-back 6 2%&?&" 2c 2 ( #c omp 07-st op 2 2 4, 2 !58 2 comp # 6$$ 6 #/-0, #/-0 %! n2 2 , 6 2%&?&" #c 5 $isable d from2 3%.3% 6 !58 6 /54 to07- 37 &" 2opto "53 $ !58
package mechanical data VIPER26 20/25 doc id 17736 rev 2 16 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. table 9. dip-7 mechanical data dim. mm typ min max a 5.33 a1 0.38 a2 3.30 2.92 4.95 b 0.46 0.36 0.56 b2 1.52 1.14 1.78 c 0.25 0.20 0.36 d 9.27 9.02 10.16 e 7.87 7.62 8.26 e1 6.35 6.10 7.11 e 2.54 ea 7.62 eb 10.92 l 3.30 2.92 3.81 m 2.508 n 0.50 0.40 0.60 n1 0.60 o 0.548
VIPER26 package mechanical data doc id 17736 rev 2 21/25 figure 29. dip-7 package dimensions
package mechanical data VIPER26 22/25 doc id 17736 rev 2 table 10. so16n mechanical data dim. mm min typ max a 1.75 a1 0.1 0.25 a2 1.25 b 0.31 0.51 c 0.17 0.25 d 9.8 9.9 10 e 5.866.2 e1 3.8 3.9 4 e 1.27 h 0.25 0.5 l 0.4 1.27 k 0 8 ccc 0.1
VIPER26 package mechanical data doc id 17736 rev 2 23/25 figure 30. so16n package dimensions
revision history VIPER26 24/25 doc id 17736 rev 2 17 revision history table 11. document revision history date revision changes 26-aug-2010 1 initial release. 01-sep-2010 2 updated figure 30 on page 23 .
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