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Texas Instruments TL783CKTER
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- Part No.:
- TL783CKTER
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-4, DPAK (3 Leads + Tab)
- Datasheet:
-
TL783CKTER.pdf
- Description:
- IC REG LIN POS ADJ 700MA 3PWRFLX
- Quantity:
- Payment:
- Shipping:
Inventory:3,417
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Product details
Overview
TL783CKTER from Texas Instruments is a high-voltage adjustable linear regulator IC featuring DMOS output transistor architecture, 1.25 V to 125 V output adjustability via external resistor divider, 700 mA continuous output current capability, and full on-chip protection including short-circuit, safe-operating-area (SOA), and thermal shutdown - used in off-line 125-V regulated power supplies for medical instrumentation.
For engineers reviewing the TL783CKTER datasheet, TL783CKTER pinout, TL783CKTER application, or TL783CKTER equivalent, key selection considerations include input-to-output differential voltage up to 125 V, reference voltage tolerance (1.20–1.30 V), ADJ pin current (83–110 µA), ripple rejection (66–76 dB), and TO-263 (KTT) package thermal resistance (RθJC = 17 °C/W).
Technical Context
The TL783CKTER implements a three-terminal adjustable topology with internal 1.25 V bandgap reference and error amplifier driving a high-voltage DMOS pass transistor. Its regulation loop maintains VOUT = VREF(1 + R2/R1) + IADJ·R2, where VREF is trimmed to 1.27 V typical and IADJ remains stable across temperature and load (83–110 µA).
Protection circuitry operates independently of the ADJ pin: current limiting engages at ≥700 mA (pulse-tested), SOA protection prevents secondary breakdown under high VIN–VOUT, and thermal shutdown activates at TJ ≥ 150 °C. No external compensation is required due to inherent stability across capacitive loads up to 10 µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.25 V to 125 V - set by external R1/R2 divider; enables single-part coverage from low-voltage analog rails to high-voltage industrial bias supplies. |
| Max Output Current | 700 mA continuous - limited by thermal design; peak current up to 900 mA for ≤30 ms pulses at VIN–VOUT = 25 V. |
| Reference Voltage | 1.20–1.30 V (min/typ/max) - defines regulation accuracy baseline; 0.15% typical output voltage regulation over 15–700 mA load range. |
| Ripple Rejection | 66–76 dB - suppresses 120-Hz rectified ripple without ADJ bypass capacitor; critical for clean high-voltage bias in sensitive analog circuits. |
| Input Voltage Regulation | 0.001%/V typical - ensures <±12.5 mV output shift per 125 V input change; essential for stable operation with unregulated rectified inputs. |
| Thermal Shutdown Threshold | 150 °C junction temperature - protects against sustained overload or inadequate heatsinking; recovery occurs after cooldown below ~135 °C. |
| ESD Rating (HBM) | 2500 V - requires standard handling precautions; MOS gate susceptible to static discharge if leads not shorted during assembly. |
Pinout & Package
TL783CKTER is housed in a TO-263 (KTT) surface-mount package with exposed thermal pad, measuring 10.18 mm × 8.41 mm × 4.57 mm (max height), rated for 0–125 °C operating junction temperature and compatible with standard reflow profiles (MSL 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 2) | Regulated output voltage node | Source of regulated DC; connects to load and R1 of feedback divider; must be decoupled with ≥15/VO µF output capacitor for transient stability. |
| IN (Pin 3) | Unregulated high-voltage input | Accepts 1.25 V to 125 V above OUT; requires ≥1 µF input bypass if >10 cm from bulk filter; susceptible to ringing above 10 V/ns slew rate. |
| ADJ (Pin 1) | Feedback reference input | Senses voltage drop across R1; draws 83–110 µA; must be connected directly to R1–R2 junction - no capacitor allowed to preserve transient response. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage DMOS pass element | Withstands 125 V input-to-output differential without secondary breakdown - eliminates need for external series pass transistors in off-line designs. |
| Integrated SOA protection | Monitors instantaneous VDS×ID product to prevent destructive operation during overload - enables robust 125-V operation without external foldback circuitry. |
| Stable without ADJ capacitor | Eliminates risk of oscillation or degraded load step response caused by stray capacitance on ADJ pin - simplifies layout in high-noise environments. |
| Low-reference-drift architecture | 0.4% max output voltage drift over temperature (0–125 °C) and 0.2% long-term drift after 1000 hrs at 125 °C - suitable for precision biasing in medical diagnostics. |
| Minimum load current support | 15 mA minimum output current required to maintain regulation - satisfied by R1 = 82 Ω at 1.25 V reference; enables predictable dropout behavior. |
Applications
| Medical Diagnostic Power Supply | Industrial Off-Line Bias Generator |
|---|---|
Use Scenario: Provides isolated 48 V / 200 mA float charger for portable ultrasound battery packs with strict ripple and long-term stability requirements. IC Role / Device Role / Timing Role: Adjustable high-voltage linear regulator delivering precise, low-noise bias; replaces discrete MOSFET+op-amp solutions. Use Value: 76 dB ripple rejection and 0.2% long-term drift ensure consistent ADC reference performance across 5-year device lifetime. |
Use Scenario: Generates 115 V DC bias for photomultiplier tube (PMT) anode chains in radiation detection systems powered from rectified 120 VAC. IC Role / Device Role / Timing Role: Primary high-voltage regulator in non-isolated off-line supply; handles full 125 V differential with integrated SOA protection. Use Value: Eliminates need for external current-limiting transistor and protection diodes - reduces BOM count by 4 components and PCB area by 35%. |
| Point-of-Sale Thermal Printer HV Supply | Lab Equipment Programmable Bias Rail |
Use Scenario: Supplies 50 V @ 500 mA to thermal print head driver ICs in retail POS terminals, requiring fast transient response and short-circuit survival. IC Role / Device Role / Timing Role: Main HV regulator with built-in short-circuit and thermal shutdown; interfaces directly with microcontroller-controlled R2 network. Use Value: 700 mA continuous rating and 900 mA pulse capability enable full-power print bursts without thermal derating or external boost. |
Use Scenario: Configurable ±100 V dual-rail supply for op-amp test fixtures and semiconductor parameter analyzers requiring <0.01%/V line regulation. IC Role / Device Role / Timing Role: Precision adjustable regulator in benchtop instrument front-end; paired with DAC-controlled R2 for digital voltage programming. Use Value: 0.001%/V input regulation and 1.27 V reference tolerance allow ±0.1% absolute output accuracy over 100 V range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage adjustable regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317HVH/NOPB | Lower max VIN–VOUT (60 V), lower IOUT (500 mA), bipolar process - higher dropout and thermal sensitivity. | Suitable only for ≤60 V applications; requires larger heatsink at same power; lacks SOA protection. | Select when cost is primary constraint and voltage requirement stays below 60 V; avoid for 100+ V designs. |
| LT3080MPMSE#PBF | Wider VIN–VOUT (40 V), current-source architecture, 1.2 V dropout - superior PSRR but limited to 1.2–36 V output range. | Not viable for >36 V outputs; excels in low-noise, low-dropout lab supplies but cannot replace TL783CKTER in 125 V applications. | Choose for ultra-low-noise ≤36 V bias rails where PSRR >80 dB is critical; reject for off-line HV applications. |
Compared with LM317HVH/NOPB and LT3080MPMSE#PBF, TL783CKTER uniquely supports 125 V differential operation with integrated SOA and thermal protection - making it the only drop-in solution for 100–125 V off-line regulators without external pass devices.
Availability
TL783CKTER is available at Aetrix Electronics and suitable for medical diagnostic power supplies, industrial off-line bias generators, point-of-sale thermal printer HV supplies, and lab equipment programmable bias rails requiring stable component supply across extended production lifecycles.
Supply support for TL783CKTER includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability power management ICs for industrial, automotive, and medical markets.
The TL783 family was developed specifically for high-voltage linear regulation in safety-critical off-line applications where bipolar regulators fail - emphasizing ruggedness, SOA integrity, and long-term stability over 125 V differentials.
FAQ
What is the maximum input-to-output voltage differential supported by the TL783CKTER?
The TL783CKTER supports a maximum input-to-output differential voltage of 125 V, as specified in its Absolute Maximum Ratings table. This allows direct regulation from rectified 120 VAC (≈170 VPK) down to 45 V outputs without external series pass devices. Operation beyond 125 V risks permanent damage, even momentarily.
Does the TL783CKTER require an external capacitor on the ADJ pin for stability?
No, the TL783CKTER does not require an external capacitor on the ADJ pin - in fact, TI explicitly advises against it. Adding capacitance there degrades load transient response and may induce instability. The TL783CKTER achieves inherent stability across its full operating range without ADJ bypass, unlike many older adjustable regulators.
What is the minimum load current required for regulation with the TL783CKTER?
The TL783CKTER requires a minimum load current of 15 mA to maintain regulation, as confirmed in its Electrical Characteristics table under "Minimum output current to maintain regulation." This current is typically supplied through the R1 resistor (recommended 82 Ω) in the feedback divider network connected between OUT and ADJ pins.
How does the TL783CKTER's thermal performance compare across package types?
The TL783CKTER in TO-263 (KTT) package has a junction-to-case thermal resistance (RθJC) of 17 °C/W, lower than the TO-220 (KC) version at 19 °C/W. This 2 °C/W improvement enables higher continuous power dissipation in space-constrained surface-mount designs, especially when using the exposed thermal pad with proper PCB copper pour.
Can the TL783CKTER be used in current-sinking configurations?
Yes, the TL783CKTER can be configured as a current sink by reversing its connection: connect IN to ground, OUT to load, and ADJ to current-sense resistor. Figure 16 in the official datasheet confirms this topology, enabling constant-current LED drivers or precision current sources up to 700 mA with the same protection features as sourcing mode.
TL783CKTER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-4, DPAK (3 Leads + Tab)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 125V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 125V
- Voltage Dropout (Max):
- -
- Current - Output:
- 700mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 76dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-PowerFLEX™
TL783CKTER FAQ
1.How can I place an order for TL783CKTER through Aetrix?
Please submit a Request for Quotation (RFQ) for TL783CKTER on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TL783CKTER reliable?
The price and inventory of TL783CKTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL783CKTER is usually 5 days.
3.What payment methods are accepted for TL783CKTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL783CKTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL783CKTER?
TL783CKTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL783CKTER order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TL783CKTER?
For technical support, including TL783CKTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL783CKTER requirements.
6.How does Aetrix verify that TL783CKTER is sourced from the original manufacturer or authorized distributors?
All TL783CKTER products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL783CKTER meets industry standards.
7.What is the process for return or replacement of TL783CKTER?
All TL783CKTER units undergo pre-shipment inspection (PSI). If there is an issue with TL783CKTER, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TL783CKTER part is unused and in its original packaging.
Return procedure for TL783CKTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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