M51994P MITSUBISHI | Alldatasheet
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MITSUBISHI <ANALOG ASSP> M51994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL
DESCRIPTION
. P VIEW M51994 is a semiconductor integrated circuit designed for PIN CONFIGURATION (TO! tew) controlling primary-control two-output switching regulators emitter [1] COLLECTOR and it is best suitable for obtaining DC stabilized voltage from Vourz Vourt the commercial power supply. ve z [14] GNo This provides fast rise/fall time of the output voltage as veel & cum well as output current, allowing the direct driving of the on/orr 3 cr MOSFET. ove] ° T-OFF This also provides fast rise/fall time on output pulses and it equips a high-speed and highly-sensitive current limit circuit, NC [id] cr therefore, you can create really high-speed switching regulators Fe [8 [3] t-on using the device. Outline 16P4 Since it contains a timer type protection circuit, the pro- tection in case of any excess output current (ie. due to a ewrrrea TO Log] coutector short-circuit) can be done easily only by adding few parts to Vours Vour the primary side. ve end FEATURES vec] gz fom © Output current. cece eee eee $2A a iy © Output rise time = 6Ons, Output fall time = 40ns sinter { 3 | Hear, ; mento & Sine Pin © Uses a pulse-by-pulse current limiting method (CLM-pin) ON/OFF u cr which minimizes required peripheral circuits. ove [8] T-OFF © Supports the protection for excess output current ne [a] cr ce cv ev eseaeeueuess Timer-type protection circuit ref fi} r-on © Uses a deforming totempole output method which require small through current. CONNECT THE — Quttine 20P2N © Supports 2-output drive functions using a steering circuit. TO GNO NC_NO CONNECTION (Applicable for push-pull, half-bridge, and full-bridge circuits) © Supports the OVP function which keeps the power OFF status once a signal is input. BLOCK DIAGRAM Veo F/B onvorF C) omen Sum ’ Gms Ht on = T uy int cotuector cr F sae To] srreans : T-on( J 33% yap < [eee 5 g OQ) voure rwrereaTienTercoT | jaar, COVPARATOR vO is () emitter ' 2 ; cum or GND MITSUBISHI pales 6—73
MITSUBISHI “ANALOG ASSP> MS1994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL © Because of the large voltage difference between the start APPLICATION and stop voltages, the smoothing capacity for the input Switching regulators of push-pull, half-bridge, and full- power supply can be minimized. bridge types vce scr ees Start voltage = 16V, Stop voltage = 10V © Uses a package with the large permissible loss to endure RECOMMENDED OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS Yoo [Yoo | cotector in epphed vonage 31 v Peak 22 ° Cures carers ‘ VF bn supplied volige v ON/OFF pn suppted votge Vove | OVP-in applied votage — ~ TT ee Vee | F/B pm appiedvotge Power dissipation Ta=25e 1s w Jo) ee Storage temperature Last — ie Note 1) The “rand — sions indicata the drection of the current How info and flow our fom the IC load, respectively ELECTRICAL CHARACTERISTICS (12=25%, Voo= 18V. unless othenmse noted! Tis Veo ‘Supply voltage range _ _ 30 v Veoisrasr Startvollage — __ se | 6.2 |e Vv Veaistori § | Stop voltage [so Pos [08 [ov | oo | & [_Voinge dteerce bowen sar andsopvoiane | SVoo=Veorstann)—Veowsron) 8.0 | 6.3 | 76 [ov | 5 Voo= 14. 5V. Ta= 25 7o | 110 | 165 | mA teow 3 | Pre-operaton cwcut cuant ze 8 Voo= 14.5, ~300 5 Tasase 3) 110 | 220 | nA 3" Yoo 14V ss [io [zz | wa | ° chun , Lvec=2sv 13 | 20 | 3.0 mA leo ovr Croat earentdveng OVP operate (OEE eae et | Toner” | g | ONIOFF pin Roh tvethold votage za] 26] 31) vit [rn overr_| S [ON/OFF pn ow fresno volage 19 5 | ON/OFF pn bystensis voltage i O41 | MITSUBISHI 6-74 Ja ltiees
MITSUBISHI <ANALOG ASSP> MS1994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL ELECTRICAL CHARACTERISTICS (Cont.) Pe [ ee ee ee | Irene Current at 0% duty cycle [-=21[=1sa) =1.0] ma Ate |, | Shinn aye ‘Ziee=IrAMINo~ IreMaxO [=1.35 [0.99 [0.70] ma | Vrs [C16 0 votage TAB pin eurent= —0 95a a9| 5.9) 74 lreors [fesnsses ama essere at | Vrnove | | OVP pn threshold voltage ee Vecovec_| & | OVP cancel source votiage al __ | 76[ 86; a6) Vv Voorstor)| | Vago arid tne OVP cancel saute 0.65) 1.30 boy =Vecove_| votage Tien Timer frequency oar] 0.71, 107] He Irimeon —) & | Timer charge current Vor =3.3V, Ta=25 =358) 256) -190) WA . [ Nor=a.3v, Taxes “Saif aeee | tea TiMEgrvion |_| Rato beween ON and OFF tmes as ne) id Vinoc= |) [COM pin treshad voage seaTeaBT lincuM= | = | CLM pin output current Vouw=—0.1V [=20s| -150. 110° wa Toocum- | | CLM pin delay ume 170 ns tose | toseitaton frequency | Bon =36k9, Rope = 12k 2 - 13| 191) 210] we Toury | & | Maximum ON duty Cr=2200F, SCs TasEse 35.0! 89.0) 93.0 VoscH | S| Use it vope tr oso waif 3.87 Vosci.__| & | Lower lit votag fr oslaton wav forms [1.6[ 1.96 2.16) v4 vos aera Anarene eng oe - zu] 2a amt v voour || Getayeero]_vr=e5V_| Fow=360, Rorr= rae 8) a ato) oe Speratons Ve=15V__ | Cr =220pF [vat 66) 91) we | /} Duty ratio during Tou [ve OH ve=0.2V | Maxnum ON dunivnemam OFF dy [ose 82) 80) = | operanons Vierwe VF vokage fr staring we operation 2.25; 28) 275] Vv We VE pin input current Output current 2 6 WA Vor TW Yoo=18V. io toma 005; oat Yor | | ouput votge [eo=18¥. to= 100m [foo aly Vous | { o6e| 1.0 Vou |B Voo=8V. 10 100m ha eo) Vou | S | Gut mgh vorage Voo= 18V. lo= — 10mA __ = 6.5" Tv Voue Voo= IBV. lo= — 100mA 15.5! 16.0 v Trise Output voltage nse une. Without load ~~ 50 as Trav ‘Output vorage fall ime | Without load 35 0s ‘!Output 1 and 2 will became HiGH at a duty apeciied per cycle, They never become HIGH at the same time.) MITSUBISHI eles 6-75
MITSUBISHI <ANALOG ASSP> M51994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL TYPICAL CHARACTERISTICS CIRCUIT CURRENT VS. SUPPLY VOLTAGE THERMAL DERATING (MAXIMUM RATING) (NORMAL OPERATION) gm som LLL Toe E Ht total ee | z i oS h ew! é ! = oom SEeEREseane acca i 1200 +— 5 meer ST 5 | 2 oom eee 3 900 | emer rs oe) Sbannee co ceeenncs 5 ad Pea goee 620 Geeeceocs E PINT | Aijeses a5 GRearence 2 300 100-4 tt} ted 2 \\ mr Tat =o= 7 Tames] 2 6 ‘. EEE ft in tans C) 25 50 7585C100 125 150 °o 10 20 30 40 AMBIENT TEMPERATURE Ta (°C) SUPPLY VOLTAGE Vee {V) CIRCUIT CURRENT VS. CIRCUIT CURRENT VS. SUPPLY VOLTAGE SUPPLY VOLTAGE {OVP STATE) (OFF STATE) 8.0) 3.2 CTI Pad A Tlae A = eo [bo -= Tas 300 © ag t—-—te-—we TT] = 6d Hy on E oa a mea 2 sot EERE EEE = ie Soa z *loveowactromn PULTE TY rape SESS EEEEESS? 3745 = als. 7av(—300)4 r 2 maaan 8“ Teevasers Tp Bet eoabans = *Ofscsvese tere 5 eee 2 aoftt {14 yea | | 3 poe 5 EEE AA 20 ceseee! Geeeeeeee hol om oat oo i>? .eneeeenee Sc? ae (ee Reese) obebabaraiererey TT TTT oO 10 20 30 40 0 10 20 30 40 SUPPLY VOLTAGE Veo {V} SUPPLY VOLTAGE Voc {V} CIRCUIT CURRENT VS. SUPPLY VOLTAGE OVP PIN THRESHOLD VOLTAGE VS. (TIMER OFF STATE) AMBIENT TEMPERATURE 3.2 5 18 ee LOTT i PTT TTT tT TT ttt rereecee ee s COC RSS Hoy FEE NCEEEEEEEEEEH 2 gaa tes > 16 <a ro £ TTT TTT tA 2 COON Jah ia 2 jsp PONE
5 YALE 3 SCN
5 yo) DTT ae gos CPN 5 to 2 peepee 3 oe roo 2 ttt _ zo EEases! seeuenene ee DSSS SRE Oe 2 EEE EEE ob LP] $y obbD Oot 0 10 20 30 40 ° =3 0 2% 50 80 110 MITSUBISHI 6-76 ate TUBS
MITSUBISHI <ANALOG ASSP> MS1994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL ON/OFF PIN THRESHOLD VOLTAGE VS. ON/OFF PIN THRESHOLD CURRENT VS. AMBIENT TEMPERATURE AMBIENT TEMPERATURE = Zz 25.0 sar] | | | I pe ee g 8 ™ _]
2 LAN |_| PTT ASN
3 & e ETT ANE oe 2 tlt i tf | 2 tll iit | rd —40-20 0 2 40 60 80 100 ¢ 40-20 0 20 40 60 80 100 g Fey
3 AMBIENT TEMPERATURE Ta (°C) 2 AMBIENT TEMPERATURE Ta (°C)
VF PIN INPUT CURRENT VS. TIMER DISCHARGE CURRENT VS. INPUT VOLTAGE _ AMBIENT TEMPERATURE Cl Tonk $ yd z _ Ta= 2s £ HEE EE EAH , qrT7 Tames 8 yo ar : mh td St secsceresees=-2 pe HEH ABM sscsscss ccetsaes Ed an g oH aH or] C_ 2 TA 5 ad i 3 “EAT a Po Ate 2-20 8 eeseaC TTT ft ERR ott NL | I I 3 HEHE EEE +H} 1.0 2,0 3.0 4.0 5.0 60 r —30 [) 2% 50 80, 0 VF PIN INPUT VOLTAGE Vr (V) AMBIENT TEMPERATURE Ta (°C) TIMER CHARGE CURRENT VS. TIMER ON (OFF) PERIOD VS. AMBIENT TEMPERATURE AMBIENT TEMPERATURE H rl £ _ fj > 2 oat EEE a coo | i See eee . - : e GaN g L a ° § CeCeer ee ANE rer = sol Pt te 8 pee neRener aaa sess a a uf & HEHE EH © Poot ra & AEN 00) ho 3 pet SE Boece tt {| | : —30 0 25 50 80 NO —40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE Ty (°C) AMBIENT TEMPERATURE Ty (°C)
4 MITSUBISHI
MITSUBISHI <ANALOG ASSP> MS1994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL TIMER OPERATION START VF VOLTAGE VS. CLM-PIN THRESHOLD VOLTAGE VS. _ AMBIENT TEMPERATURE AMBIENT TEMPERATURE o ; SEGeeeeRees! TT e EEE LTTE z HEH +- 44 e {][ [TPT] 2 ec s,f | | Tt Ty 8 Ccee HE EHH a0 © aoa CEE EE Fe Oe | ee SSS RRRSSREEEEEEE iS Lo er eee Eas a 2 eo Ee ee ee ee ee ee 2 yg = 20 2 POepeeere ce | 2 AH : 2 § CLETP TT 8 EERE - =—40 -20 0 2 40 60 80 100 30 ° 2 «650 80 110 AMBIENT TEMPERATURE Tg (°C) AMBIENT TEMPERATURE Ta (°C) CLM-PIN OUTPUT CURRENT VS. OUTPUT HIGH VOLTAGE VS. CLM-PIN VOLTAGE OUTPUT CURRENT = —500, 2.8 z . a Ch yase | TTT) g eafrocane SHETTY Fed eet 3 Cee ICA
2 Pry yo SHETT TT
a > ao HTT TT es LL TT tt TY aes DTU a 5 20 ligt tl ey 3 oA TT ae) Sane ae Pe SELL A= fl 2 — 00 Lt bei | 2 eee ¢ Fi TTT ttt z vipat AE fd ey 3 oaL LT WT MT CLMPIN VOLTAGE Vein (V) OUTPUT CURRENT low (Al OUTPUT LOW VOLTAGE VS. F/B PIN OUTPUT CURRENT VS. ON DUTY INPUT CURRENT (fosc = 100kHz) 5.0 100 ~ as LLU) Spe Mulicrccxi MMSE san + So iT CAAA eee w 35 loc . ‘a rc : t 2 oo I Ht Hh a | Wo
2 LUI 6 |
3 Santee An HE ANS
obaledLh iT TY A L| VA J 1 10 100 1000 10000 oO 0.5 1.0 6 2.0 INPUT CURRENT tho tA £78 FIN OUTPUT CURRENT imal MITSUBISHI 6-78 ae TEES
MITSUBISHI <ANALOG ASSP> M51994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL F/B PIN OUTPUT CURRENT VS. ON DUTY F/B PIN OUTPUT CURRENT VS. ON DUTY {fosc = 200kHz) {fosc = 500kHz) 100, 100, COE TET Cott PRL [TT erie ae WN ees Fa NAA z RN Scot scees ME ceva aise : g & TPT TAAN TT fe TTP AAN TI [i AAT TI PP TP INAAT [iT AAT Pit TAS I o_LL TTT INNA J oll Tt IVAN J C) 05 1.0 1S 2.0 oO 05 1.0 6 2.0 OSCILLATION WAVE FORM UPPER/LOWER LIMIT VOLTAGE VS. OSCILLATION FREQUENCY VS. AMBIENT TEMPERATURE CF PIN CAPACITY eT To ER mssisss rostisieaiiisimaiiaa ae Be le 8 sooo HHL St] 2S 43) eeer BEERS AN fon 26k 0 Rore=12K0 Sy LT ec tc00e Sti at NWI] BS ee tower 2 BREED NH Be ad 8 TTA Tie a20e0 pore a0K0 ee 5 CES ge 18 Poort § FRA : 8 EA § ts 6 woo oe 05 — 800 AMBIENT TEMPERATURE Ty (°C) CF PIN CAPACITY (oF) OSCILLATION FREQUENCY VS. ON DUTY VS. Ror AMBIENT TEMPERATURE 109 200 CT SNS = ToT elise
80 SS Fon=75k0 & 600
Z > ‘ Sei et) © 400] — [Naas al Fee i 2 : 5710 2 50 70100 ° —30 °O 50 100 Rore (6 AMBIENT TEMPERATURE T (°C) MITSUBISHI ae TBS 6-73
MITSUBISHI <ANALOG ASSP> M51994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL ON DUTY VS. AMBIENT TEMPERATURE VF PIN VOLTAGE VS. FREQUENCY 100; 5.04 Too Pater TT 2a ST eT : “COOP 2 Cee
2 CCI Nitti eos tee
& "COCs 2 SCOR Croteeeed op ENSEE LO An —40—200 20 40 60 80 100 120130 o 1 2 3 4 5 AMBIENT TEMPERATURE T, (°C) FREQUENCY EXTENSION RATE {xn} VF PIN VOLTAGE VS. FREQUENCY 5.0) Tee
3 Co er
6—80 oe lees
MITSUBISHI <ANALOG ASSP> M51994P,FP 2-OUTPUT TYPE SWITCHING REGULATOR CONTROL a eee DESCRIPTIONS OF OPERATIONS a 1. Oscillation Circuit BE vos a ea ey -- The oscillation wave form of M51994 is triangular. The se output is enabled (disabled = dead time) on the leading 22 Vosar 7 (trailing) edges. The slope of the leading edge is determined 4 = =2.0V| by multiplying the register Ron connected to the T-ON pin and the capacity of Ce connected to the Cr pin. Te = 2,2 slope of the trailing edge is determined by multiplying the see Bron registers Rog and Cr connected to the T-OFF pin. E38 2 B7e Vou (1) The operation of the oscillation circuit when =o the SOFT circuit is not working 32 The figure below shows the charge/discharge control circuit %E . Vow section of the oscillation capacitor Cr. 223 go> =O7 Vou | Jo. Je 28 ' ! o, Figure 2. Oscillation wave form in the normal status ron) J Quaey (when the intermittent action and the f ¢ tyke > sw oscillation control circuit are not working) IT-OFF yon3 Ne This is given by the following equations: ° Show ane [THIS SwiTCH Is Falling slope of the oscillation wave form R ERoM THe lroceteo By THE torr. a ICHARGE/DISCHARGE cr Sionats_|contaot siGNaLs 4 ( EOF. 4 YEON) yjsecy. (3) A Rore °C . . . Ce DISCHARGE jore "Ce 32" Ron * Cr a | ar The minimum OFF period a ° (osc - Voseu) * © + seston Is 45) oe a ee) Lue a Meo yy Rore 32*Ron Figure 1 Charge/discharge control circuit of the Here, Vy.or (voltage at T-OFF pin) is about 3.0V. oscillation capacitor Cr The period of the oscillation wave form is the sum of equations (2) and (4). The oscillation wave form becomes In the charge status SW, and SW become ON and OFF, _ triangular as shown in Figure 2. respectively. In the discharge status SW, and SW, become (9) The operation of the osicllation circuit when OFF and ON, respectively, the intermittent action and the control circuit When SW, is ON and SW, is OFF, charge current flows are working from Q, to Cr. The intermittent action and the oscillation control circuit The voltage build-up rate (the rising slope of the oscilla: Wit} be enabled when the current limit circuit (CLM-) tion wave form) of Ce is given by the following equation: works. (See the Intermittent Action and the Oscillation v Control Circuit sections.) At the time, the voltage at the ~ VEN yy 1 jon * Ce - Therefore, under this status, the falling slope of the Here, Vz.on (voltage at T-ON pin) is about 4.5V. oscillation wave form is affected by the voltage applied to Therefore, the rising slope period (that is, the maximum the VF pin and the dead time will be extended. ON period} will be as follows: The equations below are applied under the above con- (Voscx ~ Vosct) * Ron * Ce ditions: TON Here, Voscn (upper limit voltage of the oscillation wave a form) is about 4.4V and Vosex (lower limit voltage of the Row * Cr oscillation wave form) is about 2.0V. The falling slope of the oscillation wave form When SW, is OFF and SW is ON, the discharge current Vor ev. v flows from Cp to Q2. The value of this discharge current 4+ (YET VFO, STON _) Wcocy is calculated by multiplying 4 to the sum of the current Rorr x Ce 32 x Ron x Ce through Ror and 1/32nd of the current through Ron- eee eee +s. (6) a MITSUBISHI eles 6-81
2 VL TT Tt
5 DRAIN
; charge will be accumulated only in Cgs. Vee the ON status and the Cgp works as mirror capacity. etb low, and both Cgo and Ces will be involved. Figure 13. Application circuit which maintains the