TEXAS INSTRUMENTS UC3842NPWM CONTROLLER, 500KHZ, 10V-30V, PDIP-8 The UC3842 is a fixed frequency current-mode PWM controller. This article will unlock more details about UC3842. And, there is a huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.
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Sep 24, 2021
Blithe Christian
UC3842 Switching Power Supply For Battery Charger 3-15V 10A
TEXAS INSTRUMENTS UC3842NPWM CONTROLLER, 500KHZ, 10V-30V, PDIP-8
The UC3842 is a fixed frequency current-mode PWM controller. This article will unlock more details about UC3842. And, there is a huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.
UC3842N
| Quantity | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $3.51758 | $3.52 |
| 10+ | $3.31847 | $33.18 |
| 100+ | $3.13063 | $313.06 |
| 500+ | $2.95343 | $1476.72 |
| 1000+ | $2.78625 | $2786.25 |
UC3842 Pinout
| Pin Number | Pin Name | Description |
| 1 | COMP (Comparator) | It is an output pin that outputs a low impedance 1MHz signal, based on the difference between the set and current-voltage. It is normally connected to the voltage feedback pin of the IC through a resistor and capacitor. |
| 2 | VFB (Voltage Feedback) | It is an input to the error amplifier inside the IC. The difference in voltage level is supplied to this pin |
| 3 | Current Sense | A shunt resistor is used to monitor the current through the circuit, and the voltage across it is provided as feedback to the current sense pin |
| 4 | RT/CT (Timing Resistor/ Timing Capacitor) | The IC has an internal oscillator which can be set using an external resistor and capacitor connected to this pin. |
| 5 | Ground | Connected to the ground of the circuit |
| 6 | Output | This pin outputs the PWM signal based on the feedback provided and we can use this to switch the power electronic device. |
| 7 | Vcc | Supply voltage for the IC (Nominal 11V) |
| 8 | VREF | Reference voltage based on which the PWM signal is produced. |
Pin Description
UC3842 Symbol
UC3842 Footprint
UC3842 3D Model
The UC3842 is a current-mode PWM controller with a set frequency. This IC was created with minimal external components in mind for Off-Line and DC to DC converter applications, which also provides current-limit control, and a totem-pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.
Texas Instruments UC3842N technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments UC3842N.
Texas Instruments UC3842N technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments UC3842N.
| Product Attribute | Attribute Value | |
|---|---|---|
| Lifecycle Status | ACTIVE (Last Updated: 6 days ago) | |
| Factory Lead Time | 6 Weeks | |
| Mounting Type | Through Hole | |
| Package / Case | 8-DIP (0.300, 7.62mm) | |
| Surface Mount | NO | |
| Number of Pins | 8Pins | |
| Weight | 528.605208mg | |
| Operating Temperature | 0°C~70°C TA | |
| Packaging | Tube | |
| JESD-609 Code | e4 | |
| Pbfree Code | yes | |
| Part Status | Active | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Number of Terminations | 8Terminations | |
| ECCN Code | EAR99 | |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Product Attribute | Attribute Value | |
|---|---|---|
| Terminal Position | DUAL | |
| Terminal Pitch | 2.54mm | |
| Frequency | 450kHz | |
| Base Part Number | UC3842 | |
| Function | Step-Up, Step-Down, Step-Up/Step-Down | |
| Number of Outputs | 1Output | |
| Output Voltage | 13.5V | |
| Output Type | Transistor Driver | |
| Input Voltage-Nom | 15V | |
| Analog IC - Other Type | SWITCHING CONTROLLER | |
| Output Configuration | Positive | |
| Output Current | 1A | |
| Voltage - Supply (Vcc/Vdd) | 12V~28V | |
| Control Features | Frequency Control | |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward | |
| Control Mode | CURRENT-MODE |
| Product Attribute | Attribute Value | |
|---|---|---|
| Frequency - Switching | Up to 500kHz | |
| Control Technique | PULSE WIDTH MODULATION | |
| Rise Time | 50ns | |
| Supply Current-Max (Isup) | 25mA | |
| Synchronous Rectifier | No | |
| Fall Time (Typ) | 50 ns | |
| Nominal Input Voltage | 30V | |
| Max Duty Cycle | 100 % | |
| Duty Cycle (Max) | 97% | |
| Height | 5.08mm | |
| Length | 9.81mm | |
| Width | 6.35mm | |
| Thickness | 3.9mm | |
| REACH SVHC | No SVHC | |
| RoHS Status | ROHS3 Compliant | |
| Lead Free | Lead Free |
Current-Mode PWM controller
Operating Voltage: 12V to 28V
Output pin current: 200 mA
Switching Frequency: 500 kHz
Duty Cycle - Max: 100 %
Operating Supply Current:25 mA
Optimized for Off-line and DC-to-DC Converters
High-Current Totem-Pole Output
SMPS (Switch Mode Power Supplies) circuits
DC-DC converter circuits
Electronics power supply
Battery drain circuit
Load machines
UC3842 Block Diagram
The UC3842 IC is a current Mode PWM Controller, which means it can change the output voltage to the load to provide a constant current. A trimmed oscillator, a temperature corrected reference, a high gain error amplifier, a current detecting comparator, and a high current totem pole output for driving a Power MOSFET are all included in this IC.
In applications such as SMPS, RPS, DC-DC Converters, Line voltage regulators, and so on, the UC3842 can be used to regulate or limit current. So, if you're looking for an IC that can generate PWM signals to control a power switch based on the current flowing through the circuit, this IC would be a good fit.
The use of the UC3842 in a circuit is fairly straightforward because it only requires a few components. The following is a sample application circuit taken from the UC3842 datasheet.
How to UC3842 Circuit
The VCC pin's input voltage should be between 12 and 28 volts. The IC's output pin is connected to the gate driver circuit of the to-be-switched Power switch. The VFB (Voltage feedback) pin serves as feedback for controlling the PWM signal. The feedback pin receives the difference voltage across the shunt resistor, which is used to monitor the change in current in the circuit. Through the timing resistor, VREF is utilized to deliver the charging current to the oscillator timing capacitor. VREF must be bypassed to GROUND with a ceramic capacitor attached as close to the pin as possible for reference stability.
UC3842 Package
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Download datasheets and manufacturer documentation for Texas Instruments UC3842N.
Download datasheets and manufacturer documentation for UC3842N
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