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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
Patricia Miller
Length of registration:7 years
I recently ordered an IC SFH6343 from your company and I am very pleased with its performance. The IC is reliable and efficient, and it has been working great in my project. It is easy to use and the instructions were clear and concise. I am very satisfied with the quality of the product and the customer service I received. Thank you for providing me with a great product and excellent customer ser
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03/17/2023
Harry Bauder
Length of registration:3 years
The packaging is exquisite, the high-end atmosphere is high-end, it can be seen that the merchants are very attentive. The baby is really good, it is the same as the picture, there is no difference, it is really good value for money, good quality and low price
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01/09/2023
Stephen Ballentine
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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01/09/2023
Joe Ritch
Length of registration:3 years
The order is accepted, decorated and shipped quickly. Packing is good. Tracking works. Satisfied
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Gordon C Whitten
Length of registration:3 years
The goods are received on time, until I checked, as I will check the feedback. The seller sent on time, everything came safe and sound.
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01/04/2023
Glenn Hann
Length of registration:3 years
rec'd chips; great packing for international shipping; thx for making small quantities available of these hard to find items!
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12/22/2022
Lammi
Length of registration:3 years
Fantastic customer support, my order arrived very fast and well packed. All around a fantastic experience and nice to have a place to buy lower quanties of hard to find chips.
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12/22/2022
Shawn Long
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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12/19/2022
arturo solano
Length of registration:3 years
I received the parts swift and well packed. Thanks for the great service.
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12/19/2022
John Hernandez
Length of registration:3 years
I enjoyed learning how to use these. Fixed another broken project with it. Excellent quality, and it arrived in a protective tube designed to prevent damage.
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All UTSOURCE purchases have a 60 days money back return policy, plus a 90 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
UC3844BVD1R2G
UC3844BVD1R2G has several brands around the world that may have alternate names for UC3844BVD1R2G due to regional differences or acquisition. UC3844BVD1R2G may also be known as the following names:
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