UPC1042 NEC | Alldatasheet

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Technical content

. SWITCHING REGULATOR NEC Electronics Inc. CONTROL CIRCUIT eee Description Pin Configuration The wPC1042 is a switching regulator control circuit designed for use in Switch Mode Power ‘Supplies +inputa 1 761) compensation + (SMPS). The uPC1042 uses the Pulse Width Modulator ~ Input a C2 sP ve Technique (PWM) and features on chip voltage refer- coemtten a: “eB “ ence, dual error amplifiers, oscillator, pulse width modu- epee cfs Mesmeae 8D 2 lator comparator, pulse steering flip flop, dual phase inputs 6 11D Veer output drivers, and deadtime adjustment. The uPC1042 Dead Time Asi. C] 7 wher is ideai for forward and push-pull converters with enor Che sHer minimum external circuitry. sponesa, Features Ordering Information Internal oscillator has symmetrical triangular Operating waveform Part Temperature O Adjustable dead time (0 to 100%) Number Package Range ctumver____Pachage Range OD Includes a misoperation-preventing circuit at low wPC10420 Plastic OP 20°C to +85°C input voltage ee No double pulsing of outputs © Error amplifier 11 can operate with 0 V input voltage level Equivalent Circuit ._! 7 | » | : ; | 2 = tie Feet i fps Sto | aD 3 = | er 8 ono = input a 3 P-sv vsvP ‘Error Amp. 2 ry compen. Compen- sae Soa | er 7-21

Absolute Maximum Ratings Recommended Operating Conditions Ta= 25°C ree a ——— Test Supa Voltage ov Parameter Symbol Min. Typ. Max. Unit Conditions Outpt Vtage OV Spy Sapa Goren (ek Dag ea “8m 6 Octput Garret (Each Output 100 mA ——_‘llge Aaronce Ona Currant CJ % “oR v Total Powar Dissipation aoomw Ve ‘Opsrating Temperature Range 20 +05°C Heel bh 5 2 40k ‘Storage Temperature Range —40 to +125°C “Rereme 8 ‘Comment: Stress above those listed under “Absolute Maximum Oui If «90 3 5 omk Fatings" may cause permanent damage tothe devco. The so _ CT stress rating only and functional operation of the device at these Qgstation Sr any cine caaitone above hose oad inthe eperatonat BMY iy, 20010 ‘sections of this specification is not implied. Exposure to absolute _.s SS ‘maximum rating conditions for extended periods may affect device reliability,

Electrical Characteristics

V+=12V, Ta = 25°C unless otherwise noted Limits Test Parameter ‘Symbol ‘Min. Typ. Max. ‘Unit Conditions: Relerence Section Oatpat Vote 46 +50 64 WV W=0 Une Raglan ESI 335m OVS V+ <20V. Ine Load Reulaton REG, —25_ 10s OO Iqgp = 20mA Ripple Rejection aR 60 a 11202 Var OF ‘Avaer/AT 200180 wW/*C 20°C = Top = 08°C {ow Voltage Stop Section ‘Startup Voltage V+ (Lio Hy 15 VO O=Ve=I2V Hysteresis Vltage Vos 05 Vv Osvesiev Oscillator Section Maximum OselationFroquosey tmax___100 ie Initial Accuracy 25 =1O ‘yy constant “Temperature Silty =6 10% 20°C < Tp < 485°C Dalat Vote (High) You 4 v utpat Voge (Low) You 2 v Line Frequency Stbliy ata? =«OVS ve S200 Error Amplifier 1 Section Input Oat Voge Yo 22210 ow Input Oiset Voltage Orit AVg/AT HSNO WC —20°C <Topy = 085°C Input Bas Current in +13 410A are Signal Votge Gain a 2 8 o Common Made Int Votage Ven 12 a Common Mode Rejection Ratio MAR 70 fo ‘Small Signal Bandwidth ow 2 Miz Ay; = 048, C) = 560 pF, Cp = 160 pF 7-22

a Electrical Characteristics (Cont.) V+ = 12V, Ta = 25°C unless otherwise noted Limits Test Parameter ‘Symbol Min. ‘Typ. Max. Unit Conditions Error Amplifier 2 Section Input Offset Voitage Vie +3 +10 mv Input Offset Voltage Drift AVig/ AT +3 +10 wW/°C —20°C < Topp = + 85°° Input Bias Current tb “15 10 WA Large Signal Voltage Gain ‘Avo. 12 100 0B Common Mode Input Voltage Viem 0 3 v Common Mode Rejection Ratio CMRR 10 8 ‘Small Signal Bandwidth Bw 12 Miz Ay = 0 4B, Cy = 220 pF, Cg = 470 pF Maximum Output Current 10 mA ‘Dead Time Adjustment Section ‘Input Blas Current ty “45 uh __ Input Voltage (0% Duty) Vin 1.35 v __ ‘Input Voltage (100% Duty) vw 33 v ‘Output Section Collector to Emitter Voltage Vee 40 vo ig=lmA __ __ - Collector to Emitter Cutotf Current ceo 10 vk Wpe=40V _ - Collector Saturation Vottage Voe{saT) 055 a7 Vo ip=20ma __ Rise Tce cece Meee ees ID 20m, Vt = 12M. AL § 560.0 Fail Time 4 _ ee _ a ‘Total Standby Current \\ecse 12 15 ma «V+ = 20V- Iper =O Operating Characteristics Ta = 25°C Maximum Power Dissipation Oscilator Frequency vs. Rr and Cr 2 1 [| | a ee z T ra ior i os me 1000 pF Fa Fa 8 70 7a ° Fa ro we ra cy Anbar Temperte (70) Ting Reis (2 7-23

a Operating Characteristics (Cont.) Ta = 25°C Error Amplifier |, Ay; vs. Frequency Error Amoplitier ll, Ay2 vs. Frequency i OSS Fe) ESS SEIN a NNNGE TE NNN ee NNNGS SST ERAN 2 ; 4 bas NU A Total Standby Current vs. Supaly Votage Tota Standby Curent vs. Ambient Temperature 7-24

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uPC1042 N: FE C ee internal Waveforms (Timing Charts) uct vom SLE LP LE LE LE LE LEP LP Lys own OREN Ne NR FS iP yy out a nn erect tne tl (Pin7 input Vokage) (Pin'3 Output Votage) ume | ye i planta - can ae l wooo td oo oe wea id hop Tee. ion 3 pt | ro i oat 1 | oer i | ad ~LfL ober ut it a Oe ee A ee om a es ee om 7-26