TL3843DG4-8 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
TL3843DG4-8 is a current-mode PWM switching controller from Texas Instruments operating from 12 V to 30 V input at up to 500 kHz with 200 mA output drive capability. It provides precise cycle-by-cycle current limiting in an 8-pin SOIC for flyback and forward converter power supply designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- TL3843DG4-8 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 with cycle-by-cycle current limiting provides inherent overcurrent protection and fast transient response in switching converters
- Up to 500 kHz switching frequency reduces external magnetics size, enabling compact 12 V to 30 V input DC-DC converter designs
- 200 mA gate drive output in a compact 8-pin SOIC package directly drives power MOSFETs without an external driver stage
Applications
TL3843DG4-8 is widely used as the primary PWM controller in flyback and forward converter power supplies operating from 12 V to 30 V input rails in industrial equipment, telecommunications infrastructure, and embedded systems. Its current-mode control simplifies compensation and provides immediate cycle-by-cycle overcurrent shutdown, making it a reliable choice for isolated DC-DC converters and off-line SMPS designs. The 500 kHz capability and 8-pin SOIC form factor suit compact, cost-sensitive power supply modules where board area and component count are critical.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 12V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 30V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.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 |
| Technology | BIPOLAR |
| 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 TL3843DG4-8:
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 switching frequency does TL3843DG4-8 support and how does this compare to lower-frequency PWM controllers?
TL3843DG4-8 operates at up to 500 kHz, which is 5 to 10 times higher than traditional 50 kHz to 100 kHz PWM controllers. At 500 kHz, transformer and output inductor values shrink proportionally, allowing designers to use smaller magnetics and filter capacitors, resulting in a more compact and lighter switching power supply for the same output power.
How does current-mode control in TL3843DG4-8 improve converter protection compared to voltage-mode alternatives?
Current-mode PWM control in TL3843DG4-8 monitors the switch current on a cycle-by-cycle basis, shutting down the PWM output immediately if peak current exceeds the programmed limit. This provides inherent overcurrent and short-circuit protection without a separate sense-and-latch circuit, reducing external component count and improving converter reliability in fault conditions at input voltages up to 30 V.
In which converter topologies is TL3843DG4-8 best suited for industrial power supply designs?
TL3843DG4-8 is most commonly deployed in single-ended flyback and forward converter topologies for isolated DC-DC power supplies in the 12 V to 30 V input range. Its 200 mA gate drive capability and 500 kHz maximum switching frequency suit low-to-mid power converters in the 10 W to 200 W range, covering industrial, telecom, and embedded system power supply applications.
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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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