UC3843B: High Performance Current Mode PWM Controller

The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-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 (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-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 voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

特性
  • 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
封装
数据表 (1)
Document TitleDocument ID/SizeRevisionRevision Date
High Performance Current Mode ControllerUC3842B/D (408.0kB)17
封装图纸 (3)
Document TitleDocument ID/SizeRevision
8 LEAD PDIP626-05 (35.0kB)P
SOIC-14 NB751A-03 (34.3kB)L
SOIC-8 Narrow Body751-07 (62.6kB)AK
产品订购型号
产品状况Compliance封装MSL*容器预算价格 (1千个数量的单价)
UC3843BD1GActivePb-free Halide freeSOIC-8751-071Tube98$0.432
UC3843BD1R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.432
UC3843BDGActivePb-free Halide freeSOIC-14751A-031Tube55$0.2
UC3843BDR2GActivePb-free Halide freeSOIC-14751A-031Tape and Reel2500$0.432
UC3843BNGActivePb-free Halide freePDIP-8626-05NATube50$0.432
UC3843BVD1GActivePb-free Halide freeSOIC-8751-071Tube98$0.2667
UC3843BVD1R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.5733
UC3843BVDGActivePb-free Halide freeSOIC-14751A-031Tube55$0.2667
UC3843BVDR2GActivePb-free Halide freeSOIC-14751A-031Tape and Reel2500$0.5733
UC3843BVNGActivePb-free Halide freePDIP-8626-05NATube50$0.5733
订购产品技术参数
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
UC3843BD1GFlybackCurrent Mode52NoYesYesNoNo30200 / 200
UC3843BD1R2GFlybackCurrent Mode52NoYesYesNoNo30200 / 200
UC3843BDGFlybackCurrent Mode52NoYesYesNoNo30200 / 200
UC3843BDR2GFlybackCurrent Mode52NoYesYesNoNo30200 / 200
UC3843BNGFlybackCurrent Mode52NoYesYesNoNo30200 / 200
UC3843BVD1GFlybackCurrent Mode52NoYesYesNoYes30200 / 200
UC3843BVD1R2GFlybackCurrent Mode52NoYesYesNoYes30200 / 200
UC3843BVDGFlybackCurrent Mode52NoYesYesNoYes30200 / 200
UC3843BVDR2GFlybackCurrent Mode52NoYesYesNoYes30200 / 200
UC3843BVNGFlybackCurrent Mode52NoYesYesNoYes30200 / 200
High Performance Current Mode Controller (408.0kB) UC3843B
SOIC-8 Narrow Body CM1216
SOIC-14 NB NLSX5014
8 LEAD PDIP NE592