TL3843DRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TL3843DRG4 is a current-mode PWM switching controller from Texas Instruments designed for fixed-frequency off-line and DC-DC converter power supply designs. It supports input voltages from 8.2V to 30V, features programmable oscillator frequency, cycle-by-cycle current limiting, and an internal reference voltage. Packaged in a 14-pin SOIC, it is widely used in flyback, forward, and boost converter topologies for industrial and consumer power supplies.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- TL3843DRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control for inherent cycle-by-cycle current limiting and fast response
- Wide input voltage range 8.2V to 30V supporting common power supply rails
- Programmable oscillator frequency for design flexibility in switching converters
- Integrated voltage reference for accurate output regulation and feedback
- Single switch topology support for flyback, forward, and boost converters
- 14-pin SOIC package for compact and cost-effective power supply board integration
Applications
The TL3843DRG4 is widely deployed in off-line flyback power supplies, DC-DC converters, and isolated power modules for industrial equipment, consumer electronics adapters, and LED driver power stages. Its current-mode control simplifies compensation design and provides robust overcurrent protection essential for reliable power conversion in harsh environments. It is also commonly used in battery charger designs, UPS systems, and motor drive power stages where precise switching control and current limiting are required.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 8.2V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 30V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TL3843DRG4:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Frequently Asked Questions
What control mode does the TL3843DRG4 use?
The TL3843DRG4 uses current-mode pulse width modulation (PWM) control, which senses the inductor or primary winding current each switching cycle and terminates the switch on-time when the current reaches a programmed threshold. Current-mode control provides excellent line regulation, cycle-by-cycle current limiting, and simplified loop compensation compared to voltage-mode control.
What is the input voltage range of the TL3843DRG4?
The TL3843DRG4 operates from 8.2V to 30V input supply voltage, with a nominal operating point of 15V. The lower limit is set by the undervoltage lockout (UVLO) threshold of 8.2V, below which the controller shuts off to prevent under-powered switching operation that could damage the power stage components.
What switching topologies can the TL3843DRG4 support?
The TL3843DRG4 is suitable for single-switch converter topologies including flyback, forward, and boost converters. Its single gate drive output with current-mode control makes it most commonly used in flyback converters for off-line power supplies, but it also supports boost and buck-boost converters in DC-DC applications.
What package is the TL3843DRG4 available in?
The TL3843DRG4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, JESD-30 code R-PDSO-G14. This standard surface-mount package provides adequate pin count for all oscillator, feedback, gate drive, and supply pins while remaining compact and compatible with automated SMT assembly and reflow soldering processes.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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