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Description
The UC3844B, UC3845B 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 an oscillator, 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, a latch for single pulse metering, and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50% to 70%. 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 UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Title
High Performance Current Mode PWM Controller
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Preview of the first 3 pages of the data sheet
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Trimmed Oscillator for Precise Frequency Control Oscillator Frequency Guaranteed at 250 kHz Current Mode Operation to 500 kHz Output Switching Frequency Output Deadtime Adjustable from to 70% 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 These Devices are Pb-Free and are RoHS Compliant
See detailed ordering and shipping information in the package dimensions section on page 15 of this data sheet.
See general marking information in the device marking section on page 16 of this data sheet.Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1) Total Power Supply and Zener Current Output Current, Source or Sink (Note 2) Output Energy (Capacitive Load per Cycle)
Power Dissipation and Thermal Characteristics D Suffix, Plastic Package, SOIC-14 Case 751AMaximum Power Dissipation = 25°C Thermal Resistance, Junction-to-Air D1 Suffix, Plastic Package, SOIC-8 Case 751 Maximum Power Dissipation = 25°C Thermal Resistance, Junction-to-Air N Suffix, Plastic Package, Case 626 Maximum Power Dissipation = 25°C Thermal Resistance, Junction-to-Air
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
1. The voltage is clamped by a zener diode (see page 9 Under Voltage Lockout section). Therefore this voltage may be exceeded as long as
the total power supply and zener current is not exceeded.3. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JEDEC Standard
4. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78ELECTRICAL CHARACTERISTICS (VCC 15 V [Note = 3.3 nF. For typical values = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 6], unless otherwise noted.)
Total Output Variation over Line, Load, & Temperature5. Adjust VCC above the Startup threshold before setting V. 6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
ELECTRICAL CHARACTERISTICS (VCC 15 V [Note = 3.3 nF. For typical values = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 8], unless otherwise noted.)
Output Current - Sink (VO 1.1 V, VFB 2.7 V) Output Current - Source (VO 5.0 V, VFB 2.3 V)Output Voltage Swing High State (RL k to ground, VFB 2.3 V) Low State (RL k to Vref, VFB UC384XB) (UC384XBV)
Current Sense Input Voltage Gain (Notes UC384XB) (UC384XBV)Power Supply Rejection Ratio (VCC 25 V) (Note 9) Input Bias Current Propagation Delay (Current Sense Input to Output)
Output Voltage with UVLO Activated (VCC 6.0 V, ISink = 1.0 mA) VOL(UVLO) -7. Adjust VCC above the Startup threshold before setting V. 8. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
9. This parameter is measured at the latch trip point with VFB 0 V.Some Part number from the same manufacture
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10000 buyer reviews from United States
gloria sarria chavez
Length of registration:5 years
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06/12/2021
Paul Morris
Length of registration:7 years
I recently purchased an IC UC3844BDG from your company and I am very pleased with the product. It is a high-quality integrated circuit that is easy to use and provides reliable performance. It is also very cost-effective and I am confident that it will meet my needs. I am sure that I will be able to use it for a long time and it will be a great addition to my projects. I would definitely recommend
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03/17/2023
HN15871 Raul Rodriguez / Aereo
Length of registration:4 years
satisfaction
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07/21/2020
Silvestre Triana Hernandez
Length of registration:6 years
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11/05/2019
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UC3844B
UC3844B has several brands around the world that may have alternate names for UC3844B due to regional differences or acquisition. UC3844B may also be known as the following names:
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