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| Linear Integrated Circuit CURRENT-MODE PWM CONTROLLER - The KA3842A KA3842AM are fixe frequency current-mode PWM controller. They are specially designed for OFF-Line and DC-to-DC converter applications with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuity includes built under-voltage lockout and current limiting. The KA3842A,KA3842AM have UVLO thresholds of 16 V(on) and 10 V (off). The KA3842A ,KA384AM can operate within 100% duty cycle The KA3842A has been proven in applications using the same external components as Motorola's parts,among others .The KA3842AM has been optimized for compatibility with Samsung's parts Many applications can use either The KA3842A KA3842AM have Start-Up Current 0,45 mA KA3842A or KA3842AM KA3842A KA3842AM PIN CONNECTION FEATURES * * * * Low Start-Up Current Maximum Duty Cycle U/V Lockout With Hysteresis Operating Freguency Up To 500khz SO-8 DIP-8 ordering information Device KA3842AM KA3842AMM KA3842AN KA3842AMN Package SO-8 SO-8 DIP-8 DIP-8 Operating temperature 0 to +700C " " " BLOCK DIAGRAM Absolute Maximum Ratings Characteristic Supply Voltage Output Current Analog Inputs Error Amp Output Sink Current Power Dissipation (TA=250C) Symbol VCC IO VI ISINK (E.A) PO Value 30 1 -0.3 to VCC 10 1 Unit V A V mA W Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.com 1 KA3842A/KA3842AM Electrical characteristics (*VCC=15V, RT=10k, CT=3.3nF, TA=00C to +700C, unless otherwise specified) Characteristics Reference Section Reference Output Voltege Line Regulation Load Regulation Short Circit Output Current Oscillator Section Oscillation Freguency Frequency Change with Voltage Oscillator Amplitude Error Amplifier Section Input Bias Current Input Voltage Open Loop Voltage Gain Power Supply Rejection Ratio Output Sink Current Output Source Current High Output Voltage Low Output Voltage Current Sense Section Gain Maximum Input Signal Power Supply Rejection Ratio Input Bias Current Output Section Low Output Voltage High Output Voltage Rise Time Fall Time Symbol VREF VREF VREF ISC f f/VCCF V(OSC) IBIAS VI(E.A) GVO PSRR ISINK ISOURCE VOH VOL GV VI(MAX) PSRR IBIAS VOL VOH tR tF ISINK ISINK ISINK ISINK Test Condition TJ = 25C, IREF = 1 mA 12V VCC 25 V 1 mA IREF 20mA TA = 25C TJ = 25C 12V VCC 25 V Min 4.9 Typ 5.0 6.0 6.0 -100 Max 5.1 20 25 -180 57 1.0 Unit V mV mA KHz % Vp-p 47 52 0.05 1.6 -0.1 -2 2.58 V1 = 2.5V 2V V0 4V 12V VCC 25 V V2 = 2.7V, V1 = 1.1V V2 = 2.3V, V1 = 5V V2 = 2.3V, RL = 15K to GND V2 = 2.7V, RL = 15K to PIN 8 (Note 1 & 2) V1 = 5V (Note1) 12V VCC 25 V (Note 1) 2.42 65 60 2 -0.5 5.0 2.5 90 70 7 -1.0 6.0 0.8 A V dB mA mA V 1.1 3.15 1.1 -10 0.4 2.2 V/V V dB A 2.85 0.9 3.0 1.0 70 -3.0 = = = = 20 mA 200 mA 20 mA 200 mA 13 12 TJ = 25C, CL = 1nF (Note 3) TJ = 25C, CL = 1nF (Note 3) 14.5 8.5 0.08 1.4 13.5 13.0 45 35 16.0 10 V 150 150 17.5 11.5 nS Under-Voltage Lockout Section - Start Theshold VTH(ST) Min. Operating Voltage (After Turn On) PWM Section Max. Duty Cycle Min. Duty Cycle Total Standby Current Start-Up Current Operating Supply Current Zener Voltage VOPR(min) V V D(MAX) D(MAX) IST ICC (OPR) VZ V3 = V2 = 0V 95 97 100 % 0 0.17 14 38 0.3 17 mA 30 V * Adjust VCC above the start threshold before setting at 15V Note 1: Parameter measured at trip point of lath with V2=0 Note 2: Gain defined as A=V1/V3 ; 0 V3 0.8V Note 3: These parameters, although guaranteed, are not 100% tested in production. 2 KA3842A/KA3842AM Pad Location Chip size: 2.38 x 1.63 mm Pad N 1 2 3 4 Coordinates m X Y 90 110 1050 110 1310 110 2000 150 Pad N 5 6 7 8 Coordinates m X Y 1680 1450 1310 1410 815 460 1410 1390 3 KA3842A/KA3842AM DIM. MIN. A a1 a2 a3 b b1 C c1 D (1) E e e3 F (1) L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.15 0.016 0.65 0.35 0.19 0.25 0.1 mm TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 OUTLINE AND MECHANICAL DATA 45 (typ.) 5.0 6.2 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244 KA3842AM KA3842AMM SO8 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 4 KA3842A/KA3842AM 8 5 -B- 1 4 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --- 10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --- 10_ 0.030 0.040 F NOTE 2 -A- L C -T- SEATING PLANE J N D K M M TA B H G 0.13 (0.005) M M KA3842AN KA3842AMN Attention: M=10 o 5 |
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