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Texas Instruments TL1451ACPWR/5
- Part No.:
- TL1451ACPWR/5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
TL1451ACPWR/5.pdf
- Description:
- DUAL P-W-M CONTROL CIRCUIT
- Quantity:
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Product details
Overview
TL1451ACPWR/5 from Texas Instruments is a dual-channel PWM controller IC designed for high-reliability power-supply control. It integrates two error amplifiers, an adjustable oscillator (up to 500 kHz), undervoltage lockout, short-circuit protection, and dual common-emitter output transistors - all on a single monolithic chip. Its 2.5-V internal reference, variable dead-time control (0%–100%), and wide 3.6 V to 50 V supply range make it suitable for isolated DC-DC converters and industrial switching regulators.
For engineers reviewing the TL1451ACPWR/5 datasheet, TL1451ACPWR/5 pinout, TL1451ACPWR/5 application, or TL1451ACPWR/5 equivalent, key selection criteria include its dual-output PWM architecture, TSSOP-16 package thermal performance (838 mW at 25°C), –20°C to 85°C operating range, and compatibility with external RT/CT timing networks for frequency tuning between 1 kHz and 500 kHz.
Technical Context
The TL1451ACPWR/5 implements a fully synchronized dual PWM architecture with independent dead-time control per channel via dedicated DTC pins (pins 5 and 12). Its oscillator uses an external RT resistor and CT capacitor to set frequency, with typical deviation under ±2% over temperature and supply voltage.
Each error amplifier features a 1.05 V to 1.45 V common-mode input range and open-loop gain of 70–80 dB, enabling precise feedback regulation in voltage-mode or current-mode topologies. The uncommitted NPN output transistors support common-emitter drive for external MOSFET or BJT gate control, with saturation voltage ≤2.0 V at 10 mA collector current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 1 kHz to 500 kHz, set by external RT/CT; enables flexible switching frequency selection for EMI optimization and magnetics sizing. |
| Reference voltage | 2.5 V ±0.1 V (typ), internally regulated; provides stable feedback reference for both error amplifiers without external precision reference. |
| Operating temperature | –20°C to +85°C; qualified for commercial and industrial environments, not automotive-grade (Q-suffix) or military-grade (M-suffix). |
| Supply voltage range | 3.6 V to 50 V; supports wide-input offline and battery-fed systems without external LDO pre-regulation. |
| Dead-time control | 0% to 100% programmable per channel via analog DTC inputs; prevents shoot-through in half-bridge or full-bridge configurations. |
| Output transistor type | Dual NPN open-collector outputs; allows direct interface to external level-shifting circuits or discrete driver stages. |
| Short-circuit protection | Active SCP input (pin 9) with 0.65–0.75 V threshold; latches off outputs until reset, protecting downstream power devices during fault conditions. |
Pinout & Package
TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CT) | Oscillator timing capacitor | Connects to external capacitor to set oscillator frequency with RT; determines ramp slope and PWM period. |
| 2 (RT) | Oscillator timing resistor | Sets oscillator frequency with CT; higher resistance lowers frequency; requires stable metal-film resistor for accuracy. |
| 3 (1IN+) | Error amp 1 non-inverting input | Accepts feedback signal (e.g., from output divider); common-mode range limited to 1.05–1.45 V. |
| 4 (1IN–) | Error amp 1 inverting input | Connected to internal 2.5-V reference (pin 16) for standard voltage-mode control. |
| 5 (1DTC) | Channel 1 dead-time control | Analog input (1.2–2.25 V) that sets duty-cycle overlap margin; 0 V = max duty, 2.5 V = 0% duty. |
| 6 (1OUT) | Channel 1 output transistor collector | Open-collector NPN output; sinks current when active; requires external pull-up to VCC or gate driver supply. |
| 7 (GND) | Power ground | Primary return path for internal circuitry and output transistors; must be low-impedance and separated from power ground if layout permits. |
| 8 (REF) | 2.5-V reference output | Stable 2.5-V source for feedback networks; capable of sourcing up to 1 mA; used directly for error amp reference. |
| 9 (SCP) | Short-circuit protection input | Active-low fault latch enable; pulled below 0.75 V to disable outputs; reset by raising above 1.5 V or cycling VCC. |
| 10 (2IN+) | Error amp 2 non-inverting input | Second independent feedback path; supports dual-output or redundant regulation schemes. |
| 11 (2IN–) | Error amp 2 inverting input | Internally tied to REF; enables second voltage-mode regulator using same reference. |
| 12 (2DTC) | Channel 2 dead-time control | Independent analog dead-time control for second PWM channel; identical electrical behavior to pin 5. |
| 13 (2OUT) | Channel 2 output transistor collector | Second open-collector NPN output; electrically isolated from channel 1; supports interleaved or phase-shifted operation. |
| 14 (VCC) | Positive supply input | Primary power rail (3.6–50 V); powers internal regulators, amplifiers, and oscillator; bypass capacitor required at pin. |
| 15 (NC) | No connect | Not bonded internally; must remain unconnected; no routing or stitching allowed. |
| 16 (NC) | No connect | Not bonded internally; must remain unconnected; no routing or stitching allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM channels | Enables synchronous dual-output DC-DC conversion or phase-shifted full-bridge control without external synchronization logic. |
| Adjustable oscillator with RT/CT | Supports precise frequency setting from 1 kHz to 500 kHz using two passive components; eliminates need for crystal or external clock generator. |
| Programmable dead-time per channel | 0%–100% analog control allows fine-tuned overlap margin adjustment to prevent cross-conduction in bridge topologies. |
| Integrated 2.5-V reference | Stable, temperature-compensated reference reduces BOM count and improves system accuracy vs. external references. |
| Undervoltage lockout with hysteresis | Enables clean startup/shutdown: turns on at ~2.72 V, turns off at ~2.60 V, preventing erratic operation during brownout. |
| Short-circuit protection latch | Hardware-level fault response: disables both outputs upon SCP trigger and holds until reset, protecting power stage from thermal runaway. |
Applications
| Isolated Dual-Output Flyback | Industrial Half-Bridge Inverter |
|---|---|
Use Scenario: A 24-V input industrial power supply delivers +15 V and –12 V isolated outputs using a single transformer with dual secondary windings. IC Role / Device Role / Timing Role: TL1451ACPWR/5 acts as dual-channel voltage-mode PWM controller, regulating each output independently via separate error amplifier feedback paths and synchronized oscillator. Use Value: Eliminates need for two discrete controllers; shared oscillator ensures fixed phase relationship, reducing output ripple and EMI. | Use Scenario: A motor drive inverter supplies variable-frequency AC to a 3-phase induction motor using discrete IGBTs in half-bridge configuration. IC Role / Device Role / Timing Role: TL1451ACPWR/5 generates complementary PWM signals with programmable dead time to drive high-side and low-side IGBT gates via external drivers. Use Value: Prevents shoot-through by enforcing minimum off-time between complementary switches, increasing system reliability and efficiency. |
| High-Speed Buck-Boost Converter | Redundant Telecom Power Module |
Use Scenario: A 48-V telecom shelf converts to 12 V and 5 V simultaneously using coupled inductors and synchronous rectification. IC Role / Device Role / Timing Role: TL1451ACPWR/5 operates in current-mode-like configuration using feedback-derived slope compensation, with DTC pins tuned for optimal transient response. Use Value: Dual outputs reduce component count vs. two single-channel controllers; shared timing improves load-transient tracking between rails. | Use Scenario: A mission-critical server PSU employs hot-swappable 12-V modules with automatic failover; each module contains independent regulation and monitoring. IC Role / Device Role / Timing Role: TL1451ACPWR/5 serves as primary controller in each module, with SCP input tied to system fault bus to coordinate shutdown across modules. Use Value: Hardware-based SCP latching ensures deterministic fault containment without software intervention, meeting telecom GR-1089 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3846N | Single-ended output architecture; no integrated reference; requires external 5-V bias supply; fixed 500-kHz max frequency. | Designed for single-output forward/flyback; lacks dual independent DTC and second error amp; less flexible for multi-rail designs. | Select UC3846N only when cost-sensitive single-output design and legacy footprint compatibility are priorities. |
| TL5001CPW | Single-channel PWM controller; includes built-in 2.5-V reference and UVLO; oscillator frequency up to 500 kHz; no dead-time control or dual outputs. | Targeted at basic boost/buck converters; cannot implement interleaved or dual-output topologies without external logic. | Choose TL5001CPW for simpler single-rail applications where dual-channel capability is unnecessary and board space is constrained. |
Compared with UC3846N and TL5001CPW, the TL1451ACPWR/5 uniquely supports true dual independent PWM control with per-channel dead-time adjustment and integrated reference - making it the only option among the three for synchronous dual-output or phase-shifted full-bridge designs without external coordination circuitry.
Availability
TL1451ACPWR/5 is available at Aetrix Electronics and suitable for industrial switching regulators, telecom power modules, and isolated DC-DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for TL1451ACPWR/5 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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power control ICs.
The TL1451A product line was engineered for robust, dual-channel PWM control in industrial and telecom power supplies - emphasizing integration, fault resilience, and wide-input operation without external support components.
FAQ
What is the maximum oscillator frequency supported by the TL1451ACPWR/5?
The TL1451ACPWR/5 supports a maximum oscillator frequency of 500 kHz, achieved with appropriate RT and CT values (e.g., RT = 5.1 kΩ, CT = 150 pF). Frequency is linearly adjustable down to ~1 kHz using the external timing network, and variation remains within ±2% over temperature and supply voltage per datasheet specifications.
Does the TL1451ACPWR/5 include an internal voltage reference, and what is its accuracy?
Yes, the TL1451ACPWR/5 includes an internal 2.5-V reference (pin 8) with initial accuracy of ±4% over temperature (–20°C to +85°C) and ±1% typical drift over the full operating range. It sources up to 1 mA and maintains regulation within ±12.5 mV for supply variations from 3.6 V to 40 V, eliminating need for external reference in most applications.
How does the short-circuit protection (SCP) function on the TL1451ACPWR/5?
The SCP input (pin 9) on the TL1451ACPWR/5 is an active-low latch: pulling it below 0.75 V disables both output transistors and holds them off until either VCC is cycled or the SCP pin is raised above 1.5 V. This hardware-level protection responds in microseconds and prevents damage to external power devices during overload or short-circuit events.
Can the TL1451ACPWR/5 drive MOSFET gates directly, or is external buffering required?
The TL1451ACPWR/5 cannot drive MOSFET gates directly due to its open-collector NPN outputs (pins 6 and 13), which sink current but do not source it. External pull-up resistors (to VCC or gate driver supply) and optionally gate driver ICs are required to achieve adequate gate charge/discharge rates for fast-switching MOSFETs.
What is the purpose of the NC pins (15 and 16) on the TL1451ACPWR/5 TSSOP package?
Pins 15 and 16 on the TL1451ACPWR/5 are designated No Connect (NC) and are not bonded internally. They must remain unconnected - no traces, vias, or copper pours should be routed to them. Leaving them floating avoids unintended coupling or parasitic effects that could impact noise immunity or thermal performance in the TSSOP-16 package.
TL1451ACPWR/5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- -
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TL1451ACPWR/5 FAQ
1.How can I place an order for TL1451ACPWR/5 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1451ACPWR/5 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 TL1451ACPWR/5 reliable?
The price and inventory of TL1451ACPWR/5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1451ACPWR/5 is usually 5 days.
3.What payment methods are accepted for TL1451ACPWR/5?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1451ACPWR/5?
TL1451ACPWR/5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1451ACPWR/5 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 TL1451ACPWR/5?
For technical support, including TL1451ACPWR/5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1451ACPWR/5 requirements.
6.How does Aetrix verify that TL1451ACPWR/5 is sourced from the original manufacturer or authorized distributors?
All TL1451ACPWR/5 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 TL1451ACPWR/5 meets industry standards.
7.What is the process for return or replacement of TL1451ACPWR/5?
All TL1451ACPWR/5 units undergo pre-shipment inspection (PSI). If there is an issue with TL1451ACPWR/5, 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 TL1451ACPWR/5 part is unused and in its original packaging.
Return procedure for TL1451ACPWR/5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1451ACPWR/5 Tags
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