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june 2011 doc id 10977 rev 2 1/19 19 td351 advanced igbt/mosfet driver features 1.7 a sink / 1.3 a source (typ) current capability active miller clamp feature two-level turn-off with adjustable level and delay input compatible with pulse transformer or optocoupler uvlo protection 2 kv esd protection applications 1200 v 3-phase inverters motor control systems ups description this device is an advanced gate driver for igbt and power mosfets. control and protection functions are included and allow the design of high reliability systems. the innovative active miller clamp function eliminates the need for negative gate drive in most applications and allows the use of a simple bootstrap supply for the high side driver. the td351 includes a two-level turn-off feature with adjustable level and delay. this function protects against excessive overvoltage at turn-off in case of overcurrent or short-circuit conditions. the same delay is applied at turn-on to prevent pulse width distortion. the td351 is compatible with both pulse transformer and optocoupler signals. so-8 table 1. device summary order codes temperature range package packaging td351id -40c, +125c so-8 tube td351idt tape and reel www.st.com
contents td351 2/19 doc id 10977 rev 2 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.3 active miller clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.4 two level turn-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.5 minimum input on-time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.6 output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.7 undervoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 typical performance curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 10 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
td351 block diagram doc id 10977 rev 2 3/19 1 block diagram figure 1. td351 block diagram !-v 7' 287 ,1 9+ 95() 9/ /9 2)) &' &/$03 &rqwuro %orfn 9uhi 89/2 2ii/hyho 'hod\ 9+ 9 9+
pin connections td351 4/19 doc id 10977 rev 2 2 pin connections figure 2. pin connections (top view) table 2. pin description pin n name type function 1 in analog input input 2 vref analog output +5 v reference voltage 3 cd timing capacitor turn on/off delay 4 lvoff analog input turn off level 5 clamp analog output miller clamp 6 vl power supply signal ground 7 out analog output gate drive output 8 vh power supply positive supply ,1 95( ) &' /9 2)) 7' 9+ 287 9/ &/$03 !-v
td351 absolute maximum ratings doc id 10977 rev 2 5/19 3 absolute maximum ratings table 3. absolute maximum ratings symbol parameter value unit vhl maximum supply voltage (vh - vl) 28 v v out voltage on out, clamp, lvoff pins vl-0.3 to vh+0.3 v v other voltage on other pins (in, cd, vref) -0.3 to 7 v p d power dissipation 500 mw t stg storage temperature -55 to 150 c t j maximum junction temperature 150 c r thja thermal resistance junction-ambient 150 c/w esd electrostatic discharge (hbm) 2 kv table 4. operating conditions symbol parameter value unit vh positive supply voltage vs. vl uvlo to 26 v t oper operating free air temperature range -40 to 125 c
electrical characteristics td351 6/19 doc id 10977 rev 2 4 electrical characteristics t a = -20 to 125c, vh = 16 v, unless otherwise specified. table 5. electrical characteristics symbol parameter test condition min typ max unit input v ton in turn-on threshold voltage 0.8 1.0 v v toff in turn-off threshold voltage 4.0 4.2 v t onmin minimum pulse width 100 135 220 ns i inp in input current in input voltage < 4.5v 1 a voltage reference (1) v ref voltage reference t = 25c 4.85 5.00 5.15 v i ref maximum output current 10 ma clamp v tclamp clamp pin voltage threshold 2.0 v v cl clamp low voltage i csink = 500ma 2.5 v delay v tdel voltage threshold 2.5 v r del discharge resistor i=1ma 500 off level i blvoff lvoff peak input current (sink) lvoff = 12v 90 200 a v iolv offset voltage lvoff = 12v -0.3 -0.15 0 v output i sink output sink current v out = 6v 1000 1700 ma i src output source current v out = vh-6v 750 1300 ma v ol1 output low voltage 1 i osink = 20ma 0.35 v v ol2 output low voltage 2 i osink = 500ma 2.5 v v oh1 output high voltage 1 i osource = 20ma vh-2.5 v v oh2 output high voltage 2 i osource = 500ma vh-4.0 v t r rise time c l = 1nf, 10% to 90% 100 ns t f fall time (2) c l = 1nf, 90% to 10% 100 ns t don turn on propagation delay 10% out change: r d = 4.7k ? , no c d r d = 10k ? , c d = 220 pf 1.8 2.0 600 2.2 ns s t doff turn off propagation delay (2) 10% out change 550 ns
td351 electrical characteristics doc id 10977 rev 2 7/19 ? t w input to output pulse distortion 10% out change, ? t w =t wout -t win 50 100 ns under voltage lockout (uvlo) uvloh uvlo top threshold 10 11 12 v uvlol uvlo bottom threshold 9 10 11 v v hyst uvlo hysteresis uvloh-uvlol 0.5 1 v supply current i in quiescent current out = 0v; no load 2.5 ma 1. recommended capacitor range on vref pin is 10 nf to 100 nf 2. 2 step turn-off disabled. table 5. electrical characteristics (continued) symbol parameter test condition min typ max unit
functional description td351 8/19 doc id 10977 rev 2 5 functional description 5.1 input stage the td351 input is compatible with optocouplers or pulse transformers. the input is triggered by the signal edge and allows the use of low-sized, low-cost pulse transformers. input is active low and output is driven high when input is driven low. the in input is internally clamped at about 5 v to 7 v. when using an open collector optocoupler, the resistive pull-up resistor can be connected to either vref or vh. recommended pull-up resistor value with vh = 16 v is from 4.7 k ? to 22 k ? . when driven by a pulse transformer, the input positive and negative pulse widths at the v ton and v toff threshold voltages must be larger than the minimum pulse width t onmin (see figure 6 ). this feature acts as a filter against invalid input pulses smaller than t onmin . 5.2 voltage reference a voltage reference is used to create accurate timing for the turn-on delay with external resistor and capacitor. the same circuitry is also used for the two-level turn-off delay. a decoupling capacitor (10 nf to 100 nf) on the vref pin is required to ensure good noise rejection. 5.3 active miller clamp the td351 offers an al ternative solution to the problem of miller current in igbt switching applications. instead of driving the igbt gate to a negative voltage to increase the safety margin, the td351 uses a dedi cated clamp pin to control th e miller current. when the igbt is off, a low impedance path is established between the igbt gate and emitter to carry the miller current, and the volta ge spike on the igbt gate is gr eatly reduced. during turn-off, the gate voltage is monitored and the clamp output is activated when the gate voltage goes below 2 v (relative to vl). t he clamp voltage is vl+4v max fo r a miller current up to 500 ma. the clamp is disabled when the in input is triggered again. the clamp function does not affect the turn-off characteristic, but only keeps the gate at low level throughout the off-time. the main benefit is that negative voltage can be avoided in many cases, allowing a bootstrap technique for the high side driver supply. 5.4 two-level turn-off during turn-off, the gate voltage can be reduced to a programmable level in order to reduce the igbt current (in the event of overcurrent). this action prevents both dangerous overvoltages across the igbt and rbsoa problems, especially at short-circuit turn-off. the turn-off (t a ) delay is programmable through external resistor r d and capacitor c d for accurate timing.
td351 functional description doc id 10977 rev 2 9/19 t a is approximately given by (see figure 5 ): the turn-off delay (t a ) is also used to delay the input signal to prevent distortion of input pulse width. the two-level turn-off sequence can be disabled by connecting the lvoff pin to vh and connecting the cd pin to vref with a 4.7 k ? resistor. 5.5 minimum input on-time input signals with on-time smaller than t a are ignored. on-time signals larger than t a +2 . r del . c d (r del is the internal discharge switch resistance, c d is the external timing capacitor) are transmitted to the output stage after the t a delay, with minimum width distortion ( ? t w =t wout -t win ). for on-time input signals close to t a (between t a and t a +2 . r del . c d ), the two-level duration is slightly reduced and the total output width can be smaller than the input width (see figure 7 ). 5.6 output stage the output stage is able to sink/source 1.7 a/1.3 a (typical) at 25 c and 1.0 a/0.75 a min. over the full temperature range. this current capability is sp ecified near the usual igbt miller plateau. 5.7 undervoltage protection undervoltage detection protects the application in the event of a low vh supply voltage (during startup or a fault situation). during undervoltage, the out pin is driven low (active pull-down for vh>2v, and passive pull-down for vh<2v). t a s () 0.7 r d k ? () c d nf () ?? =
functional description td351 10/19 doc id 10977 rev 2 figure 3. undervoltage protection 6( /54 6 56,/( 56,/, 6ccmin &!5,4 ".w
td351 functional description doc id 10977 rev 2 11/19 figure 4. detailed internal schematic 6( 6, 62%& #,!-0 /54 6 &rpsb'hod\2ii 6 &rpsb,qsxw ). 6 6 89/2 99uhi &rqwuro%orfn &rpsb&odps 6 ,6/&& ohyho2))gulyhu )lowhu #$ x$ 9 ".w
timing diagrams td351 12/19 doc id 10977 rev 2 6 timing diagrams figure 5. general turn-on and two-level turn-off sequence figure 6. input and output waveform dynamic parameters ). /54 6ce 6(level 6ge 6(level 6,level #,!-0 6,level 4a 4a #lampthreshold ,6/&& #$ /pen 4win 4wout -illerplateau !-v !-v edgemode /54 6(level 6,level ,6 / & & 4wout tdon tdoff tonmin 6ton 6toff tonmin ). 4w i n 6ton 6toff levelmode ).
td351 timing diagrams doc id 10977 rev 2 13/19 figure 7. minimum on-time !-v ). /54 6(level #$ 6,level 6 4a 4a ,6/&& 4a 4a 4 a 4 in 4 a 2 de l # d 4 in 4 a 4 in 4 a 2 de l # d
typical performance curves td351 14/19 doc id 10977 rev 2 7 typical performance curves figure 8. quiescent current vs temperature figure 9. rdel resistance vs temperature !-v 7hps?& ,qp$ !-v 7hps?& 5gho2kpv figure 10. low level output voltage vs temp. figure 11. high level output voltage vs temp. !-v 7hps?& 92/9/9 )osinkm! )osinkm! 7hps?& 92/9/9 )osinkm! )osinkm! !-v 7hps?& 9+92+9 )osourcem! )osourcem! 7hps?& 9+92+9 )osourcem! )osourcem!
td351 typical performance curves doc id 10977 rev 2 15/19 figure 12. sink current vs temperature figure 13. source current vs temperature !-v 7hps?& ,vlqnp$ !-v 7hps?& ,vufp$
application diagrams td351 16/19 doc id 10977 rev 2 8 application diagrams figure 14. single supply igbt drive with ac tive miller clamp and opto input signal figure 15. single supply igbt drive with active miller clamp and pulse transformer input signal figure 16. large igbt drive with negative voltage gate drive and optional current buffers !-v 7' 287 + 9 1 , 95() 9/ /9 2)) &' &/$03 &rqwuro %orfn 9uhi 89/2 2ii/hyho 'hod\ 9+ 9 n 9+ !-v 7' 287 + 9 1 , 0ulsetransformer 95() 9/ /9 2)) &' &/$03 &rqwuro %orfn 9uhi 89/2 2ii/hyho 'hod\ 9+ 9 !-v 287 + 9 1 , 9 95() 9/ 9 2swlrqdo /92)) &' 9+ &/$03 2swlrqdo n 9+ 7' &rqwuro %orfn 89/2 9uhi 2iiohyho 'hod\
td351 package mechanical data doc id 10977 rev 2 17/19 9 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. figure 17. so-8 mechanical drawing table 6. so-8 mechanical data dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.00 0.150 0.157 e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k (max.) 8 ddd 0.1 0.04 #
revision history td351 18/19 doc id 10977 rev 2 10 revision history table 7. document revision history date revision changes 01-nov-2004 1 initial release 16-jun-2011 2 removed order code td351in
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