THE INFINITE POWER A aN MILCROELECTRONICS OF INNOVATION LIN Doc #: 1840 CURRENT Move PWM Conrrotter PRODUCTION DATA SHEET ST itescriprion KEY FEATURES The UC184xA family of control IC's mosfet's, and an externally program- M@ LOW START-UP CURRENT. (0.5mA max.) provides all the necessary features to mable oscillator to set frequency and M TRIMMED OSCILLATOR DISCHARGE implement off-line fixed-frequency, maximum duty cycle. The under- CURRENT. (See Product Highlight) current-mode switching power supplies voltage lock-out is designed to operate 01 OPTIMIZED FOR OFF-LINE AND DC-TO-DC with a minimum of external compo- with 250pA typ. start-up current, CONVERTERS. nents. The current mode architecture allowing an efficient bootstrap supply 1 AUTOMATIC FEED FORWARD demonstrates improved load regulation, voltage design. Available options for COMPENSATION. pulse-by-pulse current limiting and this family of products, such as start-up PULSE-BY-PULSE CURRENT LIMITING. inherent protection of the power supply _- voltage hysteresis and duty cycle, are DB ENHANCED LOAD RESPONSE output switch, The IC includes: A summarized below in the Available CHARACTERISTICS. bandgap reference trimmed to +1% Options section. The UC184xA family DO UNDER-VOUAGE LOCKOUT WITH accuracy, an error amplifier, a current of control IC's is also available in 14-pin HYSTERESIS. sense comparator with internal clamp to | SOIC package which makes the Power CO DOUBLE PULSE SUPPRESSION. 1V, a high current totem pole output Output Stage Collector and Ground pins QO) HIGH-CURRENT TOTEM POLE OUTPUT. stage for fast switching of power available. INTERNALLY TRIMMED BANDGAP REFERENCE. M 500KHz OPERATION. RL O LOW R, ERROR AMPLIFIER. COMPARISON OF UC384xA vs. SG384x DISCHARGE CurRENT UC384xA Y $G384x . SG384x Mi ECONOMICAL OFF-LINE FLYBACK OR Min. Limit Max. Limit FORWARD CONVERTERS. @ DC-DC BUCK OR BOOST CONVERTERS. @ LOW COST DC MOTOR CONTROL. = 25C AVATLABLE OPTIONS Start-Up | Hysteresis | Max. Duty A Zh roteks Cycle UCxB42A| 16V | 6V_ | <100% UCx843A| 8.4V | 0.8V | <100% yo Se UCx844A| 16V | 6V. | <50% Discharge Current Distribution - mA UCx845A | 8.4V 0.8V <50% PACKAGE ORDER INFORMATION T, (C) | M | pe DIP IDM pene SOIC Ei ann SOIC saanie DIP 0 to 70 UC384xAM UC384xADM UC384xAD _ --40 to 85 UC284xAM UC284xADM UC284xAD UC284xAY 5510125 | ven ste feet ser UCiBAgAY Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. G.c. UC3842ADMT) FOR FURTHER INFORMATION CALL (714) 898-8121 11861 Western AVENUE, GARDEN Grove, CA. 92641 1 M@ 8253880 0005133 940 OM Copyright 1995 Rev. 1.2 12/95CURRENT Mopt PWM ConrTROLLER PrRoDUCTION DATA SHEET > ABSOLUTE MAXIMUM RATINGS (note 1) > PACKAGE PIN OUTS Supply Voltage (Low Impedance Source) (Vag) sccccceceeciceeeeseseeeeeneeeeeeneeeeneneneneaseney 30V Supply Voltage (1, < 30mA) .. Self Limiting COMP C}! "8h Vig Output Current 0.0. ccecccceseeeeeeeeteenenees we ELA vn re 6 Vee Output Energy (Capacitive Load)... ccc crsecneassescrseasanecenssescasseeasseeneanes 5yJ R/C, ca sO OND Analog Inputs (V,, & Ismyge) seceeerereeeeeeee -0.3V to +6.3V Error Amp Output Sink Current 0.00... cece ccc ese e ete reeerseeateeesenteessestneeseesieeees 10mA M & Y PACKAGE Power Dissipation at T, = 25C (M Package) .......sccccccccsssecsstsessieeessecsssesessesseeesees 1Ww (Top View) Storage Temperature Range occ cc eset ces esseteeneseereeeneeeeeneseeneeneney -65C to +150C Lead Temperature (Soldering, 10 Seconds) 0.0.0... cccccsecsessereeeterresseretereneneteens 300C come CL{]i 8) Vay Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect Vy, Ga? 7imvy, to Ground, Currents are positive into, negative out of the specified terminal. Pin Ieewse CL] 3 61) OUTPUT numbers refer to DIL packages only. R/c, (ri 4 Sf) GND DM PACKAGE yr (Top View) M PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, 6,, Pad comp crf} 4h) v,, DM PACKAGE: N.c. C1) 2 13ED NC, Vv, COB ED V,, THERMAL RESISTANCE-JUNCTION TO AMBIENT, @,, Mohd Nec oupoy, D PACKAGE: Neewse COS = OE) OUTPUT N.C. CO) 6 91) GND THERMAL RESISTANCE-JUNCTION TO AMBIENT, 0,, 120C/W r/c, CO? 8h pwRGND PACKAGE: D PACKAGE THERMAL RESISTANCE-JUNCTION TO AMBIENT, 6, 130C/W (Top View) Junction Temperature Calculation: T, = T, + (P, x @,,). The @, numbers are guidelines for the thermal performance of the device/pe-board system. All of the above assume no ambient airflow Copyright 1995 Rev. 1.2 12/95 ME 4253880 0005134 687CuRRENT Move PWM ConrtTROLLER PRODUCTION DATA SHEET > ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for UC384xA with 0C ST, < 70C, UC284xA with -40C < T, $85C, UC184xA with -55C <T, < 125C; V,.=15V; R=10K; C_=3.3nF. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter ee eT eT ele CTC crs Reference Section Output Voltage Vacr | T, = 25C, 1,= 1MA 4.95 | 5.00 | 5.05 | 4.90 | 5.00 | 5.10 v Line Regulation . 12<V,,s 25V 6 20 6 20 mV Load Regulation 1<1,< 20mA 6 95 6 95 mv Temperature Stability (Note 2 & 7) 0.2 | 0.4 0.2 | 0.4 | mv/C Total Output Variation Over Line, Load, and Temperature 49 5.1 | 4.82 5.18 Output Noise Voltage (Note 2) Ww 10Hz < fs 10kHz, T, = 25C 50 50 pV Long Term Stability (Note 2) T, = 125C, t= 1000hrs 5 95 5 95 mV Output Short Circuit Current lee -30 | -100 | -180 | -30 | -100|-180} mA > Oscillator Section Initial Accuracy (Note 6) T, = 25C 47 | 52 | 57 | 47 | 52 | 57 kHz Voltage Stability 12 <V,, $ 25V 02 | 1 0.2 | 1 % Temperature Stability (Note 2) Tran S Ta S Tax 5 5 % Amplitude (Note 2) 17 1.7 Vv Discharge Current T,= 25C, Ving = 2Y 78 | 83 | 88 | 7.8 |] 83 | 88 mA Veni a= 2 Tn S Ta S Trax 75 88 | 7.6 8.8 mA Error Amp Section Input Voltage Vonn1 = 2-5V 2.45 | 2.50 | 2.55 | 2.49 | 2.50 | 9.58 v Input Bias Current ok 0.3; -1 -0.3 } -2 HA Open Loop Gain Avo. | 25 Vo 5 4V 65 | 9 65 | 90 dB '_Unity Gain Bandwidth (Note 2) UGBW | T,=25C 07 | 1 0.7 | 1 MHz Power Supply Rejection Ratio (Note 3) PSRR | 12<V,, s 25V 60 | 70 60 | 70 dB Output Sink Current lor Vong = 2-7V, Vom = 1.1 2 6 2 6 mA Output Source Current lon | Vowg = 2-3, Ven = SV -0.5 | -0.8 -0.5 | -0.8 mA Output Voltage High Level Von | Vows = 2-3V, R, = 15K to ground 5 6 5 6 v Output Voltage Low Level Vor | Vee = 2-7V, R, = 15K to Vpe- 0.7 | 1.1 0.7 | 1.1 v Current Sense Section Gain (Note 3 & 4) Avot : 285; 3 |3.15]285; 3 |;315} WV Maximum Input Signal (Note 3) Von = DV 09 | 1 11 ),09) 1 1.1 v Power Supply Rejection Ratio (Note 3) PSRR | 12<V,.<95V 70 70 cB Input Bias Current iF -2 | -10 -2 | -10 HA Delay to Output (Note 2) Toa | Vans = 0 to 2V 150 | 300 150 | 300 ns Output Section Cutput Low Level! V lone = 2ZOMA 0.1 | 0.4 0.1 | 0.4 Vv | Lea = ZOOMA 1.5 | 2.9 1.5 | 22 7 Output High Level Vv leource = 2OMA 13 | 13.5 13 | 13.5 v HT heuer = ZOOMA 12 113.5 12 | 13.5 v Rise Time (Note 2) TR T, = 95C, G = 1nF 50 | 150 50 | 150 ns Fall Time (Note 2) T; T, = 25C, C = 1nF 50 | 150 50 | 150 ns. UVLO Saturation Vear | Vee = BY, lene = TOMA 0.7 | 1.2 0.7 | 1.2 v (Electrical Characteristics continue next page.) Copyright 1995 Rev. 1.2 12/95 M@@ 6253880 0005135 713CuRRENT MopeE PWM ConTROLLER PRODUCTION DATA SHEET ELECTRICAL CHARACTERISTICS (co leita s Symbol Test Conditions a lia ada - AE 2ca) Tae ee nba Under-Voltage Lockout Section Start Threshold xB42A/4A 15 | 16 | 17 |14.5; 16 | 17.5 Vv X843A/5A 78 | 84/90 | 7.8 | 84 | 9.0 v Min. Operation Voltage After Turn-On xXB42A/4A 9 10 | 11 $85 | 10 | 11.5 v . xXB43A/5A 70 | 76 | 82 | 7.0 | 7.6 | 82 v PWM Section Maximum Duty Cycle XB42A/3A 94 | 96 | 100 | 94 | 96 | 100 % xB44A/5A 47 | 48 | 50 | 47 | 48 | 50 % Minimum Duty Cycle 0 0 % > Total Standby Section Start-Up Current 0.3 | 0.5 0.3 | 0.5 mA Operating Supply Current lee 11 17 11 17 mA Zener Voltage V, lee = 25MA 30 | 35 30 | 35 v Notes: 2. These parameters, although guaranteed, are not 100% tested in 7. "Temperature stability, sometimes referred to as average temperature production. coefficient, is described by the equation: 3. Parameter measured at trip point of latch with V,,, = 0. V__. (max.) - Voee (min.) Temp Stability = A Veour emp y T, Gnax.) - T, (min.) 4, Gain defined as: A, = iv.) OS Viceusp 0.8V. J J ISENSE Veer (max.) & Vy. (min.) are the maximum & minimum reference 5. Adjust V,. above the start threshold before setting at 15V. voltage measured over the appropriate temperature range. Note that the 6. Output frequency equals oscillator frequency forthe UC1842A and extremes in voltage do not necessarily occur at the extremes in UC1843A. Output frequency is one half oscillator frequency for temperature." the UC1844A and UC1845A. > BLOCK DIAGRAM Veg O 34V I Voce 4 js/ri CQ 5.6V GROUND Hysteresis i_Ref 50mA UVLO 0: My NiBa3A/S4 16V(1842A/4A]} BV {5A 8,4V[18434/5A} Internal Bias 2.5V * V, EF Ve Good Logic 4 R/C, O Oscillator a OUTPUT Error Amp S Vip R PWM Latch - +s Comparator CURRENT SENSE C} *- Vand V, are internally connected for 8 pin packages. xx - POWER GROUND and GROUND are internally connected for 8 pin packages. ex - Toggle flip flop used only in x844A and x845A series. Copyright 1995 Rev. 1.2 12/95CURRENT Move PWM ConTROLLER PRODUCTION DATA SHEET CHARACTERISTIC CURVES FIGURE 1. OSCILLATOR FREQUENCY vs. TIMING RESISTOR = IM o e o z 9 100k irs 5 3 3 6 10k 1.72 For R, > Sk, f= RC Note: Output drive frequency is half the oscillator frequency for 300 1.0k 3.0k 10.0k 30.0k 100k the UCx844A/5A devices. R, - (ohms) FIGURE 2. MAXIMUM DUTY CYCLE vs. TIMING RESISTOR 100.0 80.0 60.0 40.0 Maximum Duty Cycle - (%) 20.0 300 1.0k 3.0k 10.0k 30.0k 100k R, - (ohms) Copyright 1995 Rev.1.2 12/95CURRENT Move PWM CONTROLLER PRODUCTION DATA SHEET TYPICAL APPLICATION CIRCUITS FIGURE 3. CURRENT SENSE SPIKE SUPPRESSION Voc DC BUS UCx84xA The RC low pass filter will eliminate the leading edge current spike caused by parasitics of Power MOSFET. FIGURE 4. MOSFET PARASITIC OSCILLATIONS Vee DC BUS UCx84xA A resistor (R,) in series with the MOSFET gate will reduce overshoot & ringing caused by the MOSFET input capacitance and any inductance in series with the gate drive. (Note: It is very important to have a low inductance ground path to insure correct operation of the I.C. This can be done by making the ground paths as short and as wide as possible.) M@ 4253860 0005138 4ee = FIGURE 5. EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYNCHRONIZATION O44 8 Ra $ 8 4 7 4 UCx84xA R 6 555 4 TIMER 2 Tot a ~ oP To other = t 1.44 = UCx84xA devices ~ IR, + 2RIC fx Rs Precision duty cycle limiting as well as synchronizing several parts is possible with the above circuitry. Copyright 1995 Rev. 1.2 12/95NT Move PWM ConrTROLLER PRODUCTION DATA SHEET > TYPICAL APPLICATION CIRCUITS (continued FIGURE 6. SLOPE COMPENSATION Vee DC BUS O UCx84xA 712) -< 5V 8{14) . UVLO s 5v - Tei itt 741 INTERNAL . BIAS =< Vaer GOOD LOGIC 71) OSCILLATOR ' ra a te cs. 6110} Tope - 1Vv ERROR a 58) _L AMP PWM LATCH R Wt | oe Due to inherent instability of current mode converters running above 50% duty cycle, slope compensation should be added to either the current sense pin or the error amplifier. Figure 6 shows a typical slope compensation technique. 3{5) HH E4 $50 FIGURE 7. OPEN LOOP LABORATORY FIXTURE J O Ver R 7 Vcc 2N2222 47K . 100K 1K ERROR AMP OMFS ADJUST 5K . = A7K Iseuse () OUTPUT ADJUST II c O GROUND High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Copyright 1995 Rev. 1.2 12/95CURRENT MopE PWM ConrTROLLER ea abe ws PRODUCTION DATA SHEET APPLICATION CIRCUITS (caesarean, FIGURE 8. OFF-LINE FLYBACK REGULATOR 47k 1W WW a 220pF TT 2s0v = 2 140kO $1 /2W AC 1N4004 Y 1N4004 INPUT oe ATK 16V SPECIFICATIONS Input line voltage: Input frequency: Switching frequency: Output power: Output voltage: Output current: Line regulation: Load regulation: Efficiency @ 25 Watts, Vy = GOVAC: Vy = 130VAC: Output short-circuit current: MH 6253840 00051240 080 UC3844A 9OVAC to 130VAC 50 or 60Hz 40KHz +10% 295W maximum 5V +5% 2 to 5A 0.01%N 8%/A* 10% 65% 2.5Amp average Tl MBR735 T 5 >t1 3600pF 400V 4700pF =. SV TOV 77) 2-5A 1N4935 : o 1N4935 i Q 820pF wo & 3 2.5kQ e 0.85kQ ISOLATION BOUNDARY * This circuit uses a low-cost feedback scheme in which the DC voltage developed from the primary-side control winding is sensed by the UC3844A error amplifier. Load regulation is therefore dependent on the coupling between secondary and control windings, and on transformer leakage inductance. Copyright 1995 Rev. 1.2 12/95 102832Package Information MECHANICAL DIMENSIONS 8-Pin Plastic Mini-Dip o > 7 Lis SEATING PLANE a Ca J M DIM NT Traatsiesd es) Inches MIN MAX MIN MAX A 10.16 0.400 B 6.10 6.60 0.240 0.260 C 5.08 0.200 D 0.38 0.51 0.015 0.020 F 0.76 1.52 0.030 0.060 G 2.54 BSC 0.100 BSC H 0.76 1.27 0.030 0.050 J 0.20 0.38 0.008 0.015 K 3.18 0.125 L 7.62 BSC 0.300 BSC M 15 15 Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006") on any side. Lead dimension shall not include solder coverage. 14-Pin Plastic Dip Po 8 ~ > J M~.} \. SEATING PLANE [INFINITY DIM NT Traatsiesd es) Inches MIN MAX MIN MAX A 18.54 20.57 0.730 0.810 B 6.09 6.60 0.240 0.260 C 5.08 0.200 D 0.38 0.51 0.015 0.020 F 0.76 1.52 0.030 0.060 G 2.54 BSC 0.100 BSC H 1.27 2.28 0.050 0.090 J 0.20 0.38 0.008 0.015 K 3.18 0.125 L 7.62 BSC 0.300 BSC M 15 15 Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006") on any side. Lead dimension shall not include solder coverage. Copyright ' 1998 Rev. 1.7 8/98 MICROELECTRONICSPackage Information MECHANICAL DIMENSIONS 3-Pin Plastic TO-247 MIN MAX MIN MAX pe | r Cc A 20.83 21.34 0.820 0.840 t B 16.26 0.640 i EX pe Cc 4.93 5.33 0.190 0.210 ay L D 1.02 1.40 0.040 0.055 / E 3.18 3.43 0.125 0.135 A lw G 5.46 BSC 0.215 BSC H 2.79 0.110 123 J 0.51 0.71 0.020 0.028 K 19.81 20.32 0.780 0.800 be L 3.05 3.56 0.120 0.140 S 4.50 0.177 K Ww 3.43 0.135 Go| ml Loy 8-Pin Ceramic Dip MIN MAX MIN MAX St, ot fh fy A 9.91 10.92 0.390 0.430 8 5 | B 5.59 7.11 0.220 0.280 5 i, Cc 4.32 5.08 0.170 0.200 D 0.38 0.51 0.015 0.020 1 4 | F 1.02 1.78 0.040 0.070 of AP oP oe G 2.54 BSC 0.100 BSC A H 1.14 1.65 0.045 0.065 J 0.20 0.38 0.008 0.015 es) Ee _ K 3.18 4.06 0.125 0.160 | | L 7.37 7.87 0.290 0.310 C M 15 15 4 | N 0.51 1.02 0.020 0.040 N- x J 7 M H Lg | | SEATING | D PLANE Copyright ' 1998 Rev. 1.7 8/98 [INFINITY MICROELECTRONICSPackage Information MECHANICAL DIMENSIONS | R | 9-Pin Metal Can TO-66 MIN MAX MIN MAX A 15.75 0.620 B 11.94 12.70 0.470 0.500 Cc 6.60 7.62 0.260 0.300 D 0.71 0.86 0.028 0.034 E 1.27 1.91 0.050 0.075 F 24.33 24.43 0.958 0.962 G 4.83 5.33 0.190 0.210 H 14.48 14.99 0.570 0.590 J 2.36 2.72 0.093 0.107 K 9.14 10.41 0.360 0.410 L 36 TYP 36 TYP P 0.64 0.025 Q 3.61 3.86 0.142 0.152 R 4.11R 0.162R Ss 8.89R 0.350R T 3.68R 0.145R DIM Millimeters Inches MIN MAX MIN MAX A A 4.83 5.00 0.190 0.197 H H H H B 3.81 3.94 0.150 0.155 Cc 1.35 1.75 0.053 0.069 8 5 | D 0.33 0.51 0.013 0.020 B P F 0.77 0.030 1 4 G 1.27 BSC 0.050 BSC J 0.19 0.25 0.007 0.010 17 H H H K 0.13 0.25 0.005 0.010 L 4.80 5.21 0.189 0.205 Te J [tke i 5 5 G 1 P 5.79 6.20 0.228 0.244 | - *LC 0.10 0.004 C ( \ M * Lead Coplanarity HEA ES \- + Note: 1. Dimensions do not include mold flash or protrusions; these SEATING PLANE K J shall not exceed 0.15mm (.006") on any side. Lead dimension shall not include solder coverage. 16 &> [INFINITY Cop 199 MICROELECTRONICSPackage Information MECHANICAL DIMENSIONS Py 14-Pin Plastic SOIC MIN MAX MIN MAX A A 8.54 8.74 0.336 0.344 HAAAASG A B 3.81 3.94 0.150 0.155 4 a] f Cc 1.35 1.75 0.053 0.069 D 0.33 0.51 0.013 0.020 BP F 0.77 0.030 7 | G 1.27 BSC 0.050 BSC =n J 0.19 0.25 0.007 0.010 + i FTHAHHH.} k | oto | 028 | 0004 | oot0 |G bk ! pb L 4.82 5.21 0.189 0.205 M 0 8 0 8 | r L . P 5.79 6.20 0.228 0.244 *LC 0.10 0.004 HAAR M \ ft * Lead Coplanarity a th FP Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006") on any side. Lead dimension shall not include solder coverage. SEATING PLANE ~ Py 16-Pin Plastic SOIC MIN MAX MIN MAX A A 9.78 10.01 0.385 0.394 H H H H H H H H B 3.81 4.01 0.150 0.158 16 3 T Cc 1.35 1.75 0.053 0.069 D 0.35 0.46 0.014 0.018 BP F 0.77 0.030 1 8 | G 1.27 BSC 0.050 BSC ft ~ J 0.19 0.25 0.007 0.010 _1 K 0.10 0.25 0.004 0.010 tp ee 1 kD L 4.82 5.24 0.189 0.205 |, M 0 8 0 8 | | P 5.79 6.20 0.228 0.244 fee eee? y J Lee 20 00 M ! d= * Lead Coplanarity SEATING PLANE KO J oF Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.15mm (.006") on any side. Lead dimension shall not include solder coverage. Copyright ' 1998 Rev. 1.7 8/98 17 MICROELECTRONICS