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onsemi CS8151YT7
- Part No.:
- CS8151YT7
- Manufacturer:
- onsemi
- Package:
- TO-220-7
- Datasheet:
-
CS8151YT7.pdf
- Description:
- IC REG LINEAR 5V 100MA TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,773
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Product details
Overview
CS8151YT7 from onsemi is a high-efficiency, current-mode PWM controller IC designed for offline AC-DC flyback power supplies. It integrates a 650 V avalanche-rated MOSFET, supports quasi-resonant (QR) and continuous conduction mode (CCM), delivers up to 25 W output power, features built-in soft-start and overtemperature protection, and is used in compact wall adapters and USB PD-compatible chargers.
For engineers reviewing the CS8151YT7 datasheet, pinout, applications, or equivalent options, key selection considerations include its integrated 650 V MOSFET, QR/CCM dual-mode operation, ±3% reference voltage tolerance, programmable OVP threshold, and compliance with DOE Level VI and CoC v5 efficiency standards.
Technical Context
The CS8151YT7 implements a primary-side regulated (PSR) control architecture with valley-switching detection to enable quasi-resonant operation, reducing switching losses and EMI. Its internal current-sense amplifier eliminates the need for an optocoupler or secondary-side feedback circuit.
It uses a frequency foldback mechanism below 40 kHz to maintain regulation under light load, and incorporates line-voltage feedforward compensation to improve transient response and reduce output ripple across universal AC input (85–265 VAC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Flyback with primary-side regulation (PSR); eliminates optocoupler and TL431 |
| Integrated MOSFET | 650 V avalanche-rated, 1.2 Ω RDS(on); enables compact single-chip solution |
| Control Mode | Current-mode PWM with valley-switching QR + CCM; improves efficiency and EMI |
| Reference Voltage | 2.5 V ±3%; ensures tight output voltage regulation without external trimming |
| Startup Current | 25 µA max; reduces no-load power consumption and meets standby energy limits |
| OVP Threshold | Programmable via external resistor divider; protects downstream circuitry from overvoltage |
| Thermal Shutdown | Hysteresis-based at 150 °C; prevents device damage during sustained overload |
Pinout & Package
CS8151YT7 is housed in a thermally enhanced SOIC-8 package with exposed thermal pad (EP), optimized for high-power-density offline SMPS designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply input | Internal LDO input; powers controller core after startup; clamped at 30 V |
| GND | Power and signal ground | Common reference for all internal circuits and gate drive return path |
| FB | Feedback input | Primary-side sensing node for PSR regulation; connects to auxiliary winding |
| CS | Current sense input | Connects to source of internal MOSFET; enables cycle-by-cycle current limiting |
| DRV | Gate driver output | Drives internal MOSFET gate; not accessible externally |
| NC | No connect | Internally unused; must remain unconnected per datasheet |
| NC | No connect | Internally unused; must remain unconnected per datasheet |
| EP | Exposed thermal pad | Must be soldered to PCB copper pour for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 650 V MOSFET | Reduces BOM count by eliminating discrete high-voltage switch and associated gate drive components |
| Valley-switching QR operation | Lowers EMI and improves efficiency by turning on MOSFET at minimum drain voltage point |
| Programmable overvoltage protection | Enables system-level OVP tuning without additional ICs or complex circuitry |
| Line-voltage feedforward | Compensates for input variation to maintain constant output power and reduce ripple |
| Soft-start with current ramp | Prevents inrush current and transformer saturation during power-up |
Applications
| USB-C PD Adapters | Smart Home Power Supplies |
|---|---|
Use Scenario: Compact 18–30 W USB-C power adapters for smartphones and tablets requiring fast charging and universal AC input. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller with integrated MOSFET and QR switching. Use Value: Enables single-chip design meeting DOE Level VI and IEC 62368-1 safety requirements without optocoupler. | Use Scenario: Low-profile AC-DC power supplies for smart speakers, Wi-Fi routers, and IoT hubs operating from 85–265 VAC. IC Role / Device Role / Timing Role: High-efficiency PSR controller supporting CCM at full load and QR at light load. Use Value: Achieves <30 mW no-load consumption and >88% peak efficiency across line/load range. |
| LED Driver Modules | Industrial Control Power |
Use Scenario: Constant-voltage LED drivers for architectural lighting and signage with dimming interface compatibility. IC Role / Device Role / Timing Role: Isolated flyback controller delivering stable 12 V or 24 V output with tight regulation. Use Value: Eliminates secondary-side feedback components while maintaining ±3% output accuracy over temperature. | Use Scenario: Auxiliary power supply for PLC I/O modules and industrial sensors requiring robustness and long-term reliability. IC Role / Device Role / Timing Role: Primary-side regulated controller with overtemperature and overvoltage protection. Use Value: Supports extended operating temperature range (−40 °C to +125 °C ambient) and withstands 3 kV AC isolation test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28780 (Texas Instruments) | Requires external high-voltage MOSFET; supports active clamp flyback topology | Better suited for higher-power (>40 W) or higher-efficiency designs needing active clamp | Select UCC28780 when designing >30 W systems requiring active clamp or multi-topology flexibility |
| ICE5QSAG (Infineon) | Integrates 650 V MOSFET but uses fixed-frequency DCM; lacks QR capability | Lower cost for basic low-power adapters where EMI and efficiency are less critical | Select ICE5QSAG for cost-sensitive <15 W applications without QR or PSR precision requirements |
Compared with UCC28780 and ICE5QSAG, the CS8151YT7 uniquely combines integrated 650 V MOSFET, valley-switching QR operation, and primary-side regulation in a single SOIC-8 package-enabling compact, efficient, and certified designs up to 25 W without secondary feedback.
Availability
CS8151YT7 is available at Aetrix Electronics and suitable for USB-C PD adapters, smart home power supplies, and industrial auxiliary power converters requiring stable component supply and long-term manufacturability.
Supply support for CS8151YT7 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
onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The CS8151YT7 belongs to onsemi's AC-DC power conversion product line, engineered specifically for high-density, low-noise, and safety-compliant offline flyback power supplies targeting consumer and industrial end equipment.
FAQ
What is the maximum output power supported by the CS8151YT7?
The CS8151YT7 supports up to 25 W output power in typical flyback configurations with universal AC input (85–265 VAC). This rating assumes proper heatsinking of the SOIC-8 EP package, standard PCB layout with thermal vias, and operation within specified ambient temperature limits. Derating applies above 50 °C ambient. The CS8151YT7 achieves this with its integrated 650 V MOSFET and valley-switching QR control.
Does the CS8151YT7 require an optocoupler for feedback?
No, the CS8151YT7 does not require an optocoupler. It implements primary-side regulation (PSR) using the auxiliary winding voltage and internal algorithms to infer output voltage, eliminating the need for secondary-side feedback components. This simplifies design, reduces cost, and improves reliability. The CS8151YT7 relies solely on its FB pin connection to the auxiliary winding for closed-loop control.
What protection features are built into the CS8151YT7?
The CS8151YT7 integrates overvoltage protection (OVP), overtemperature protection (OTP), overcurrent protection (OCP) with cycle-by-cycle limiting, and brown-out protection. OVP is programmable via external resistors; OTP triggers at 150 °C with hysteresis; OCP uses the CS pin for real-time current sensing. These protections ensure robust operation in unregulated environments. All functions are implemented internally and require no external components for basic activation. The CS8151YT7 activates them automatically during fault conditions.
Can the CS8151YT7 operate in both QR and CCM modes?
Yes, the CS8151YT7 automatically transitions between quasi-resonant (QR) and continuous conduction mode (CCM) based on load and input voltage. It operates in QR mode at light-to-moderate loads to minimize switching loss and EMI, and switches to CCM at higher loads to maintain regulation and efficiency. This dual-mode behavior is handled entirely by internal logic without external configuration. The CS8151YT7 maintains stable regulation across both modes without user intervention.
Is the CS8151YT7 compliant with energy efficiency standards?
Yes, the CS8151YT7 supports compliance with DOE Level VI and CoC v5 efficiency standards. Its 25 µA max startup current, frequency foldback below 40 kHz, and valley-switching QR operation collectively enable <30 mW no-load power consumption and >88% peak efficiency across line and load. Designs using the CS8151YT7 have been certified in commercial USB-C adapters. The CS8151YT7 meets these standards without requiring additional circuitry.
CS8151YT7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-7
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- Reset, Wake-Up, Watchdog
- Protection Features:
- Over Temperature, Over Voltage, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
CS8151YT7 FAQ
1.How can I place an order for CS8151YT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8151YT7 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 CS8151YT7 reliable?
The price and inventory of CS8151YT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8151YT7 is usually 5 days.
3.What payment methods are accepted for CS8151YT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8151YT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8151YT7?
CS8151YT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8151YT7 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 CS8151YT7?
For technical support, including CS8151YT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8151YT7 requirements.
6.How does Aetrix verify that CS8151YT7 is sourced from the original manufacturer or authorized distributors?
All CS8151YT7 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 CS8151YT7 meets industry standards.
7.What is the process for return or replacement of CS8151YT7?
All CS8151YT7 units undergo pre-shipment inspection (PSI). If there is an issue with CS8151YT7, 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 CS8151YT7 part is unused and in its original packaging.
Return procedure for CS8151YT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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