TL3845DG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments TL3845DG4 is a current-mode PWM controller with 200 mA gate drive, up to 500 kHz switching, and 8.2 V to 30 V input range, in a 14-pin SOIC package for flyback, boost, and forward converter designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- TL3845DG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TL3845DG4?
- Current-mode PWM control with cycle-by-cycle peak current limiting provides inherent overload and short-circuit protection
- 500 kHz maximum oscillator frequency enables compact transformer and inductor designs in high-density power supplies
- 200 mA totem-pole gate drive output directly drives power MOSFETs without an external driver stage
- Internal 5 V precision reference with 1% accuracy simplifies feedback network design for regulated output voltages
What is TL3845DG4 used for?
The TL3845DG4 is used as the primary control IC in offline flyback converters, boost regulators, and forward converters for industrial and consumer power supplies. Its current-mode architecture with built-in slope compensation ensures stable operation across wide input voltage ranges from 8.2 V to 30 V. The device is well suited for AC/DC adapters, auxiliary power supply stages, and battery chargers where cost-effective PWM control with robust protection features is required.
What are the specifications of TL3845DG4?
| Pbfree Code | Yes |
| 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 |
| 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 |
Where can I find the TL3845DG4 datasheet?
TL3845DG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TL3845DG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does current-mode control in TL3845DG4 protect the power stage during overload conditions?
The TL3845DG4 implements cycle-by-cycle current limiting by comparing the sensed switch current to a programmable threshold each switching cycle. When peak current exceeds the limit, the PWM output is immediately terminated for that cycle, clamping switch current to a safe level and preventing transformer saturation or MOSFET destruction even during sustained short-circuit events.
What maximum switching frequency can TL3845DG4 achieve, and how does that affect transformer size?
The TL3845DG4 supports oscillator frequencies up to 500 kHz, which directly reduces the required transformer core size according to Faraday's law. At 500 kHz versus 100 kHz, the transformer can be roughly 5x smaller in core volume for the same power throughput, enabling a significant reduction in converter height and footprint for adapter and charger designs.
What input voltage range does the TL3845DG4 operate from, and what supply rail is needed to power it in offline applications?
The TL3845DG4 operates from 8.2 V minimum up to 30 V maximum, with a 15 V nominal input. In offline flyback converters, a small auxiliary winding on the transformer provides this bias supply, typically regulated to 12 V to 15 V to keep the IC within its optimal operating window after startup.
How does TL3845DG4 differ from TL3844 in terms of maximum duty cycle, and when should each be chosen?
The TL3845DG4 is limited to a maximum duty cycle of 50%, while the TL3844 allows duty cycles up to 100%. The 50% limit of TL3845 is mandatory for half-bridge and push-pull topologies to prevent transformer volt-second imbalance, whereas TL3844 suits flyback and forward converters that require duty cycles beyond 50% at low input voltages.
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Why Buy from FindMyChip
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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