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UC3842AN Controller: Datasheet, Equivalent and CAD Models [Video & FAQ]

Author: Irene
Date: 10 Jan 2022
 529
Datasheet

Catalog

UC3842AN Description

Related Video Instruction

UC3842AN CAD Models

UC3842AN Pin Configurations

UC3842AN Features

UC3842AN Applications

UC3842AN Datasheet

UC3842AN Product Attributes

Related Electronics Part Number

UC3842AN VS UC3842N

Manufacturer

Using Warning

FAQ about UC3842AN

UC3842AN Description

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control currentmode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

 

Video: Current Mode PWM SMPS controller UC3842

UC3842 Video Description:

in this video i discussed Functional Description of Current Mode PWM SMPS controller UC3842

 

Video: UC3842 OPEN LOOP TEST CIRCUIT (Alfaro, Bugnot, Maramara, Ocampo, Pascual)

UC3842AN Video Description: 

The UC3842 is a fixed frequency current-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum 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 for driving a Power MOSFET.

 

UC3842AN CAD Models

Figure-UC3842AN-Part-Symbol

 

Figure: UC3842AN Part Symbol

 

Figure-UC3842AN-Footprint

 

Figure: UC3842AN Footprint

 

Figure-UC3842AN-3D-Model

 

Figure: UC3842AN 3D Model

 

UC3842AN Pin Configurations

Figure-UC3842AN-Pin-Configurations

 

Figure: UC3842AN Pin Configurations

 

UC3842AN Features

  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feedforward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High-Current Totem Pole Output
  • Internally-Trimmed Bandgap Reference
  • Up to 500-kHz Operation
  • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer

 

UC3842AN Applications

  • Switch Mode Power Supplies (SMPS)
  • DC-DC Converters
  • Power Modules
  • Industrial PSU 
  • Battery Operated PSU

 

UC3842AN Datasheet

Click the link given below to download the datasheet.

UC3842AN-Datasheet

UC3842AN Product Attributes

Physical
Case/Package PDIP
Number of Pins 8
Weight 528.605208 mg
 
Technical
Duty Cycle 1
Fall Time 50 ns
Frequency 450 kHz
Input Current 11 mA
Max Duty Cycle 1
Max Frequency 500 kHz
Max Input Voltage 25 V
Max Operating Temperature 70 ℃
Max Output Current 1 A
Max Output Voltage 13.5 V
Max Power Dissipation 1 W
Max Supply Voltage 30 V
Min Operating Temperature 0 ℃
Min Supply Voltage 12 V
Nominal Input Voltage 15 V
Number of Channels 1
Number of Outputs 1
Output Current 1 A
Output Voltage 5 V
Power Dissipation 1 W
Reference Voltage 5 V
Rise Time 50 ns
Schedule B 8542390000
Switching Frequency 500 kHz
Termination Through Hole
Tolerance 0.02
Topology Flyback, Boost, Buck-Boost
 
Dimensions
Height 5.08 mm
Length 9.81 mm
Thickness 3.9 mm
Width 6.35 mm
 
Compliance
Lead Free Lead Free
Radiation Hardening No
REACH SVHC No SVHC

 

UC3842A, PWM Controllers With Low Start-up Current

 

UC3842M, Current-Mode PWM Controller

 

UC3843A, Current Mode PWM Controller

 

UC3844A, Current Mode PWM Controller

 

UC3845A, Current Mode PWM Controller

 

PT2202, Low-Cost Current Mode PWM Controller

 

PT2201, Current Mode PWM Controller

 

NCP5322A, Two-Phase Buck Controller With Integrated Gate Drivers And 5-Bit DAC

 

ISL6556B, Optimized Multiphase PWM Controller With 6-Bit DAC And Programmable Internal Temperature Compensation For VR10.X Application

 

MIC2169, MIC2169 500kHz PWM Synchronous Buck Control IC

 

ISL65426MREP, Enhanced Product (EP) 6.0A Dual Synchronous Buck Regulator With Integrated MOSFETs 

 

UCC1570, Low Power Pulse Width Modulator

 

HIP6019B, Advanced Dual PWM And Dual Linear Power Control

 

UC3842AN VS UC3842N

Source Content uid UC3842AN UC3842N
Rohs Code No Yes
Part Life Cycle Code Obsolete Obsolete
Ihs Manufacturer ON SEMICONDUCTOR FAIRCHILD SEMICONDUCTOR CORP
Part Package Code DIP DIP
Package Description DIP, DIP8,.3 DIP, DIP8,.3
Pin Count 8 8
Reach Compliance Code not_compliant compliant
ECCN Code EAR99 EAR99
HTS Code 8542.39.00.01 8542.39.00.01
Analog IC - Other Type SWITCHING CONTROLLER SWITCHING CONTROLLER
Control Mode CURRENT-MODE CURRENT-MODE
Control Technique PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Input Voltage-Max 30 V 30 V
Input Voltage-Min 11.5 V 12 V
Input Voltage-Nom 15 V 15 V
JESD-30 Code R-PDIP-T8 R-PDIP-T8
JESD-609 Code e0 e3
Length 9.78 mm 9.2 mm
Number of Functions 1 1
Number of Terminals 8 8
Operating Temperature-Max 70 °C 70 °C
Operating Temperature-Min - -
Output Current-Max 1 A 1 A
Package Body Material PLASTIC/EPOXY PLASTIC/EPOXY
Package Code DIP DIP
Package Equivalence Code DIP8,.3 DIP8,.3
Package Shape RECTANGULAR RECTANGULAR
Package Style IN-LINE IN-LINE
Peak Reflow Temperature (Cel) NOT SPECIFIED NOT APPLICABLE
Qualification Status Not Qualified Not Qualified
Seated Height-Max 4.45 mm 5.08 mm
Surface Mount NO NO
Switcher Configuration SINGLE SINGLE
Switching Frequency-Max 500 kHz 500 kHz
Technology BIPOLAR BIPOLAR
Temperature Grade COMMERCIAL COMMERCIAL
Terminal Finish Tin/Lead (Sn/Pb) Matte Tin (Sn)
Terminal Form THROUGH-HOLE THROUGH-HOLE
Terminal Pitch 2.54 mm 2.54 mm
Terminal Position DUAL DUAL
Time@Peak Reflow Temperature-Max (s) NOT SPECIFIED NOT APPLICABLE
Width 7.62 mm 7.62 mm
Base Number Matches 7 5

 

Manufacturer

Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. It is one of the top 10 semiconductor companies worldwide based on sales volume.The company's focus is on developing analog chips and embedded processors, which account for more than 80% of its revenue.TI also produces TI digital light processing technology and education technology products including calculators, microcontrollers and multi-core processors. The company holds 45,000 patents worldwide as of 2016.

 

Using Warning

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

FAQ about UC3842AN

Is the uc3842 IC a current mode controller?

Note: Complete Technical Details can be found at the UC3842 datasheet given at the end of this page. The UC3842 IC is a current Mode PWM Controller, meaning it can be used to provide a constant current by varying the output voltage to the load.

 

Is the uc3842 output driver biased to a high impedance?

During UVLO, the UC3842 output driver is biased to a high impedance state. However, leakage currents (up to 10 µA), if not shunted to ground, could pull high the gate of a POWERMOS. A 100 k Ω shunt, as showing in figure 6, will hold the gate voltage below 1V. APPLICATION NOTE 3/16

 

What is the under voltage lockout on uc3842?

UNDER-VOLTAGE LOCKOUT (UVLO) This circuit insures that VCCis adequate to make the UC3842 fully operational before enabling the output stage. Figure 5a shows that the UVLO turn-on and turn-off thresholds are fixed internally at 16 V and 10 V respectively. The 6 V hysteresis prevents VCC oscillations during power sequencing.

 

How is the peak current determined in uc3842?

UC3842 Block Diagram. Current limiting is simplified with current-mode con- trol. Pulse-by-pulse limiting is, of course, inherent in the control scheme. Furthermore, an upper limit on the peak current can be established by simply clam- ping the error voltage.

 

What is the use of PWM in SMPS?

PWM (Pulse Width Modulated) power supplies are a type of switching power supply. Pulse Width Modulation is generally used to help regulate the voltage in a switching power supply. This is necessary when the current demand on the power supply or the charging system's supply voltage is not constant.

 

How is power control done using PWM?

Pulse-width modulation (PWM) is a commonly used technique for controlling power made practical by modern electronic power switches. The average value of voltage (and current) fed to the load is controlled by turning the (transistor) switch between supply and load on and off at a fast pace.

 

What is the advantage of using SMPS?

The device is used in SMPS is compact and very small in sizeThe manufacturing cost is reducedProvide isolation between multiple outputLow power wastage.

 

How does SMPS power supply works?

SMPS works by turning the main power on and off at a high speed to reduce the voltage. In such a case the reduction in voltage depends on the ratio of time and off time. Switching happens very quickly, 10,000 times or faster per second.

 

Why are PWM controllers preferred?

Pulse width modulation is a great method of controlling the amount of power delivered to a load without dissipating any wasted power. The above circuit can also be used to control the speed of a fan or to dim the brightness of DC lamps or LED's.

 

What is PWM in power supply?

Pulse Width Modulation (PWM), also known as pulse-duration modulation (PDM), is a technique for reducing the average power in an Alternating Current (AC) signal. Effectively chopping off parts of the waveform reduces the average voltage without affecting the base frequency of the signal.

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
UC3842AN UC3842AN Company:ON Semiconductor Remark:Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-PDIP Package:8-DIP (0.300"", 7.62mm)
DataSheet
In Stock:On Order
Buy
Price:
356+: $0.70365
Buy
UC3842AN1 UC3842AN1 Company:ON Semiconductor Remark:Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down - DC-DC Controller IC 8-PDIP Package:8-DIP (0.300", 7.62mm)
N/A
In Stock:On Order
Inquiry
Price:
829+: $0.30000
Inquiry
UC3842AN2 UC3842AN2 Company:ON Semiconductor Remark:Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-PDIP Package:8-DIP (0.300"", 7.62mm)
N/A
In Stock:On Order
Inquiry
Price:
820+: $0.23920
Inquiry
UC3842ANG UC3842ANG Company:ON Semiconductor Remark:Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down - DC-DC Controller IC 8-PDIP Package:8-DIP (0.300", 7.62mm)
N/A
In Stock:On Order
Buy
Price:
283+: $0.88000
Buy
UC3842ANG4 UC3842ANG4 Company:Texas Instruments Remark:Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down - DC-DC Controller IC 8-PDIP Package:8-DIP (0.300", 7.62mm)
N/A
In Stock:On Order
Buy
Price:
250+: $0.70000
Buy

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