M5291P MITSUBISHI | Alldatasheet
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MITSUBISHI <Dig./Ana. INTERFACE> MS291P,FP DC-DC CONVERTER
DESCRIPTION
M5291 is a semiconductor integrated circuit which is de- PIN CONFIGURATION (TOP VIEW) signed for switching regulator control. The device consists of a comparator, controlled pulse width oscillator (with peak SWITCH coLtector[T]O 2 [8] oRIVE current protection circuit), temperature compensated refer- switch emitter [2] & BEAK CURRENT ence, and high current output switch. TIMING CAPACITOR 3 LB] vec Especially, this IC was designed for Step-Down and Step-Up grouno [4] q [5] COMPARATOR and Voltage-Inverting applications. INPUT Outline 8P4(P) FEATURES 8P2S-A(FP) © Wide range of output @ Wide range of switching frequency .... 100Hz~ 100kHz © Built-in peak current protection circuit APPLICATION General power supply system BLOCK DIAGRAM SWITCH coutecton C) (8) DRIVER | = euirten 2) a @ sence ' 1 TIMING CAPACITOR @ COMPARATOR om 17v | REFERENCE > 4 COMPARATOR round (4) ©) ineor a MITSUBISHI ata 5-77
MITSUBISHI <Dig./Ana. INTERFACE> MS291P, FP DC-DC CONVERTER ABUSOLUTE MAXIMUM RATINGS (Ta=25¢, unless otherwise noted) [Symbol [Parameter Condos Ratings nt | voc | Power supply votage Pw =0.3~40 | vocs) [Switch eotectorvoiage Pt | vers) | Swchemitervoage Pe [isctsr[ eset evn votge ae | Voto) | Drvercotlectorvotage Pa | tsw | Swen current 200 mw Internal power disspat 8 pin DIP Tc — [Benet to K Thermal derat [x | memtcweme ee ove Operating ambeent temperature | =20~ +75 Ltsig [Stovage temperature | asses ELECTRICAL CHARACTERISTICS (Ta=25%. voc =5v) s Test cond uni jn a i bol Paramete est conditions (ammo we) [_crargecuront to Tas fs P| [io |p| Discharge curent | tt 200 eso Tea | | Osctaiorvotge Pe PO vee | to/tc | S| Charge. discharge current rato pe Currant provecton, detecting votage | La | 30 | 90 |v | Darlington connecton_Isw= SOMA [fs [207 vt 'sw_=S0mA__ 1¢(0) = 10mA [fos | oe Tv | [cotlectorteakcuret | Voesaov Tt Pn Threshold vokage po Pa Pas Tv Vrnnes I Threshold voltage regulation [sosvocswv CT os [oe | mv | e Japut bias current [viwsoy ao F200 TY Grrcuit current ae 2s Tima 5-78 fe Mee
MITSUBISHI <Dig./Ana. INTERFACE> MS291P,FP DC-DC CONVERTER APPLICATION CIRCUITS (1) Step-Up Circuit n= L ov 510 4H lo=20mA @ ® EF 1G @) = @) | a, i Do Vin G) COMPARATOR (6) +—o 5v | 100. F ot | [> y @) ) Vout 6 ep 12V/20mA tt Cour Ri R 100 .F s1K0 Ka (2) Step-Up circuit with Transistor Vin=5V Vour=12V oni 10.H ' r 1G Tr mii: = @) 2 = om 6800 60ma ° 3) COMPARATOR (6) on o Yue e207 | > ' 100 nF @) @) wna toe Ri 100 nF 9.1ka Re aie ELECTRIC . 5~79
MITSUBISHI <Dig./Ana. INTERFACE> MS5291P,FP DC-DC CONVERTER (3) Step-Down Circuit Vin=24V Vour=5V 1o=0.1A f=5OkHz © PL Saas | ©) CO Rs i F PTS 1 12k oR ® Te He, af ® COMPARATOR ©) —o yn 1.17v 72 Cw | hh : > ‘ 100. 440 2H 7 er) © Vour o TD 5V/0.1A ot Cour Ri n 100 uF a6Ke 1.2ka (4) Step-Down Circuit with Transistor Vin==24V Vour=5V, lomlA (= S0KH2 — ne pe we) © Tr 3000 P| Cl 1 [ ° (3 ® © AHH gs | 0.160 (3) COMPARATOR (6) =~ yy G: 1.17 T2 Cin sone H [| > ! @ © Vour OT SV/1A + Rr L @ Cour x R 100 .F 3.6K 1.2k@ eae 5—80 J ELECTRIC
MITSUBISHI <Dig./Ana. INTERFACE> M5291P,FP DC-DC CONVERTER (5) Inverse Polarity Circuit Vin=5V Vour=—5V 1o=40mA t=50kHz (1) (8) ' | Lott 3 o . i ve 1 " 1.59 vi (3) COMPARATOR ©) 7 sy Cn over SF > ‘ 100 D (4) ) ~5/40mA gr Cour Ri Yrs +] 100uF ko & 3.3k0 (6) Inverse Polarity Circuit with Transistor Vin=5V_ Vour=—12V lo=1A 1=50kHz Rs pnp| 71000 b Tr FL Saas | Re © Cl L | “et C3 fi | 20H) @ fee | a19 Vin G) COMPARATOR (6) = sy 7 ' 100 uF D 820pF ve —— —12V/1A ae Cour Ri Re 4h, 220uF 2.40 22k MITSUBISHI falters . 5—81
MITSUBISHI <Dig./Ana. INTERFACE> MS291P,FP DC-DC CONVERTER CONSTANT DEFINITION Ton Vout + Ve = Vin(Min Vout + Ve {Vout | + Ve Torr Vin Guin) = Vsat Vins@win) ~ Vsat = Vout Vin=Vsat 1 1 T = a Ton+ Torr Ton+ Tore Ton+ Torr Torr 1+ aon 14 aon y+ ton Tore Tore Torr 1 1 1 T a Ht, wi or Ton Ton vi xv: —Vsat— vi = (Maonan =Vsat) « rovuany (Yam Vsat=Vout).ronuars] (Yaad —Vs8t) « ropes PK Te a 0.33 0.33 IpK 1PK Rt Ray Ray Vo atk + BD 1aiTx (+ 85 4.17% (1+ BB) VF: Forward Voltage of Diode Vat: Output saturation voltage of M5291 (0. 6Vmax at single output, 2.0Vmax at Darlington output) f: Setting switching frequency first and calicurate each constant value NOTE: 1) Peak current sence {n overcurrent function, oscillator is stop, when voltage descend of external detecting resistance is more than 330mV. 2) ON/OFF Controt {f you need stop the action, connected resistance (5 ~ 10kQ) between supply voltage terminal and timing capaci- tor capacitor terminal. T . 3) =—©N js not established more than 0.857, because Ton + Torr charge and discharge current ratio fixed 1:6. 5—82 pales .