UC3843B

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 Ref...

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SeekIC No. : 004535631 Detail

UC3843B: Features: • Trimmed Oscillator for Precise Frequency Control• Oscillator Frequency Guaranteed at 250 kHz• Current Mode Operation to 500 kHz• Automatic Feed Forward Compensati...

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Part Number:
UC3843B
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/7

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Product Details

Description



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



Pinout

  Connection Diagram


Specifications

Rating Symbol Value Unit
Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) VCC, VC 30 V
Total 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
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, SOIC−14 Case 751A
Maximum Power Dissipation @ TA = 25
Thermal Resistance, Junction−to−Air
D1 Suffix, Plastic Package, SOIC−8 Case 751
Maximum Power Dissipation @ TA = 25
Thermal Resistance, Junction−to−Air
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ TA = 25
Thermal Resistance, Junction−to−Air
PD
RJA
PD
RJA
PD
RJA
862
145
702
178
1.25
100
mW
/W
mW
/W
W
/W
Operating Junction Temperature TJ +150
Operating Ambient Temperature
UC3842B, UC3843B
UC2842B, UC2843B
UC3842BV, UC3843BV
NCV3843BV
TA 0 to 70
− 25 to + 85
−40 to +105
−40 to +125
Storage Temperature Range Tstg − 65 to +150

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional  peration above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the  ecommended Operating Conditions may affect device reliability.




Description

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 voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).




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