UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
High Performance Current Mode Controllers
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−DC converter applications offering the designer a cost−effective solution 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 totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle−by−cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8−pin dual−in−line and surface mount (SOIC−8) plastic package as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−14 package has separate power and ground pins for the totem pole output stage.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off−line converters. The UCX843B is tailored for lower voltag
Features
• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle−By−Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
• Pb−Free Packages are Available
| ABSOLUTE MAXIMUM RATINGS(1) |
| Bias and Driver Voltages VCC, VC 30 V Power Supply and Zener Current (ICC + IZ) 30 mA Output Current, Source or Sink IO 1.0 A Output Energy (Capacitive Load per Cycle) W 5.0 J Current Sense and Voltage Feedback Inputs Vin − 0.3 to + 5.5 V Error Amp Output Sink Current IO 10 mA |
PART OF STOCK
| C.I LM2936Z-5,0 | BSS138LT1G |
| CAP 0805 1UF 25V X7R CL21B105KAFNNNE | CKCA43X7R1H102KT |
| RES 0402 82K 5% RC0402JR-0782KL | RC2512JK-073R6L |
| RC0805JR-0710KL | PBY201209T-102Y-N |
| RC0805JR-071KL | FUSÍVEL POLYFUSE 60R090XU |
| DIODO DF06S | 12061C102MAT 2A |
| INDUTOR. 100UH SLF7045T-101MR50-PF | NANOSMDC012F-2 |
| RES 470R 5% RC0805JR-07470RL | BD9703FP-E2 |
| ACOPLADOR OTICO. MOC3021S-TA1 | CAP CER 6.8 pF 50V
08055A6R8JAT2A |
| DIODO P6KE180A | 08055A470KBT2A
CAP CER 47pF 50V- NPO |
| RES 1206 470R 5% RC1206JR-07470RL | 1.5SMC30AT3G |
| C.I HCF4060BEY | BAT54S |
| ACOPLADOR MOC3020M | CAP CER 100KPF/50V ±20%
C0805C104M5RACTU |
| DIODO W08M | TRAN NDT456P |
| TRANS TIP127 (ROHS) | 12063C105MAT2A |
| TRIAC BTA24-600B | CAP CER 15PF 50V 10%
06035A150JAT2A |
| RES 1206 0R1 1% RL1206FR-070R1L | 08053A332KAT2A |
| C.I KA7815ETU | CAP CER 33PF/50V 5%
C0603C330J1GACTU |
| C.I AT91SAM7S64C-AU | POLYSWITCH 050A 13.2V nanoSMDC050F/13.2-2 |
| C.I LM1117MPX-ADJ | DIO SMCJ30A-E3/57T |
| C.I MAX3232IPWR | C.I ICL7660CBAZ |
| C.I.MT8816AE1 | C1210C106M5PACTU |
| STD4NK60ZT4 | DIO ES2D-E3/52T |
| C.I PIC18F452-I/PT | GP1S094HCZ0F |
| DIODO. BYG20J-E3/TR | RES 330K 1%
RC0603FR-07330KL |
| TRANS NDD04N60ZT4G | SMBJ6.5A-E3/52 |
| C.I LM35DZ | BAT54A |
| CAP 4,7UF 10V X5R 10% CL21A475KPFNNNE | BSS138 |
| CAP CL21B105KOFNNNE | BSS123 |
| CAP 0402 100NF 16V X7R CL05B104KO5NNNC | BZX84C18LT1G |
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UC3843BN Electronics Components Integrated Circuit Chip Program Memory Images
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