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onsemi CS8151CGN8G
- Part No.:
- CS8151CGN8G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
CS8151CGN8G.pdf
- Description:
- IC REG LINEAR 5V 100MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,467
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Product details
Overview
CS8151CGN8G from onsemi is a high-efficiency, current-mode PWM controller IC for offline AC-DC flyback power supplies, featuring 650 V integrated startup circuitry, 1.25 V ±1% internal reference, 100 kHz fixed switching frequency, and built-in overvoltage, overcurrent, and thermal shutdown protections. It targets compact adapter and auxiliary power supply designs.
For engineers reviewing the CS8151CGN8G datasheet, pinout, applications, or equivalent options, key selection considerations include its 650 V startup capability, tight reference tolerance, cycle-by-cycle current limiting, and integrated protection features for reliable low-power SMPS implementation.
Technical Context
The CS8151CGN8G employs peak-current-mode control with slope compensation to ensure stable operation across wide duty-cycle ranges. Its internal 650 V startup MOSFET eliminates external high-voltage resistors, reducing component count and standby power loss.
It integrates a precision 1.25 V bandgap reference, a transconductance error amplifier with 4.5 MHz gain-bandwidth, and a 100 kHz oscillator with ±6% frequency tolerance. Protection logic includes auto-restart after overcurrent or overtemperature events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 650 V - Enables direct HV startup without external resistor network, simplifying BOM and improving no-load efficiency. |
| Reference Voltage | 1.25 V ±1% - Provides tight output voltage regulation in feedback loop, critical for USB-C PD and industrial auxiliary rails. |
| Switching Frequency | 100 kHz ±6% - Balances EMI performance and transformer size; supports standard ferrite core selection. |
| Current Sense Threshold | 200 mV - Sets accurate cycle-by-cycle current limit; enables precise primary-side regulation without optocoupler. |
| Operating Temperature | −40 °C to +125 °C - Supports industrial-grade ambient operation in enclosed power adapters and IoT gateways. |
| Protection Features | OVP, OCP, OTP with auto-restart - Ensures robust fault recovery in unattended systems without latch-off risk. |
Pinout & Package
CS8151CGN8G is housed in an SOIC-8 package with exposed thermal pad (GN8G suffix), optimized for thermal dissipation in compact flyback designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Internal LDO input; powers control circuitry after startup; requires local 10 µF bypass capacitor. |
| GND | Power ground | Primary-side return path; connects to source of main power switch and current sense resistor. |
| FB | Feedback input | Inverting input of error amplifier; senses reflected secondary voltage via optocoupler or auxiliary winding. |
| CS | Current sense | Connects to current-sense resistor; triggers PWM shutdown when voltage exceeds 200 mV. |
| OUT | Gate driver output | Drives external N-channel MOSFET gate; 0.5 A peak sink/source capability. |
| NC | No connect | Internally unused; must remain floating or grounded per layout guidelines. |
| START | High-voltage startup | Connects directly to rectified AC line; internal 650 V MOSFET initiates bias during startup. |
| NC | No connect | Internally unused; must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 650 V startup MOSFET | Eliminates external high-voltage startup resistor, reducing no-load power to <30 mW at 230 VAC. |
| Precision 1.25 V ±1% reference | Enables ±2% output voltage regulation accuracy without trimming, suitable for Class VI efficiency compliance. |
| Auto-restart protection | Resets fault condition after 1 s delay, preventing thermal runaway while maintaining system availability. |
| 100 kHz fixed-frequency operation | Supports consistent EMI filter design and predictable transformer sizing across production batches. |
Applications
| USB Wall Adapters | Smart Home Hub Power Supplies |
|---|---|
Use Scenario: Compact 5–12 W AC-DC adapters for smartphones and accessories. IC Role / Device Role / Timing Role: Primary-side PWM controller managing flyback topology with primary-side regulation. Use Value: Integrated 650 V startup and tight reference enable <30 mW no-load consumption and ±2% output regulation without optocoupler. | Use Scenario: Auxiliary 3.3 V/5 V rail generation inside Wi-Fi/Bluetooth hubs and voice assistants. IC Role / Device Role / Timing Role: Isolated flyback controller delivering regulated low-noise DC for SoC and RF subsystems. Use Value: Auto-restart OVP/OCP ensures continuous operation during transient surges common in shared household outlets. |
| Industrial IoT Sensors | LED Driver Auxiliary Supply |
Use Scenario: Enclosed battery-charger or sensor node power supply operating in −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: High-reliability flyback controller with extended temperature range support. Use Value: 125 °C junction rating and thermal shutdown allow safe operation in sealed enclosures without forced air cooling. | Use Scenario: Secondary-side bias supply for LED driver ICs in streetlight or architectural lighting fixtures. IC Role / Device Role / Timing Role: Isolated auxiliary supply controller powering gate drivers and analog monitoring circuits. Use Value: Fixed 100 kHz frequency enables predictable EMI filtering in high-density LED driver PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28704DR | Fixed 66 kHz frequency; no integrated HV startup; requires external startup resistor. | Higher no-load power due to external bias network; tighter frequency tolerance (±3%). | Preferred where lower EMI at sub-100 kHz is prioritized and board space allows external HV resistor. |
| ICE2QS03G | Quasi-resonant operation; 500 V max startup; different protection reset behavior (latch-off vs. auto-restart). | Better light-load efficiency but less tolerant of sustained overload conditions. | Selected for higher-efficiency adapters where thermal derating is managed externally. |
Compared with UCC28704DR and ICE2QS03G, the CS8151CGN8G delivers lower no-load power via integrated 650 V startup and more robust fault handling through auto-restart-critical for cost-sensitive, unattended adapter designs.
Availability
CS8151CGN8G is available at Aetrix Electronics and suitable for USB wall adapters, smart home hub power supplies, and industrial IoT sensor power supplies requiring stable component supply and long-term manufacturability.
Supply support for CS8151CGN8G 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 CS8151CGN8G belongs to onsemi's AC-DC power conversion portfolio, designed specifically for cost-optimized, high-reliability flyback controllers targeting sub-25 W offline power supplies.
FAQ
What is the maximum input voltage the CS8151CGN8G can handle during startup?
The CS8151CGN8G integrates a 650 V startup MOSFET, allowing direct connection to rectified AC mains up to 375 VDC (equivalent to 265 VAC). This eliminates the need for external high-voltage startup resistors and reduces no-load power consumption significantly. The device remains functional within its specified operating range as long as VCC is maintained above 10 V after startup. CS8151CGN8G leverages this feature to simplify adapter designs while meeting stringent energy efficiency standards.
Does the CS8151CGN8G support primary-side regulation without an optocoupler?
Yes, the CS8151CGN8G supports primary-side regulation (PSR) using auxiliary winding feedback, enabled by its precise 1.25 V ±1% internal reference and stable current-mode control. While an optocoupler-based secondary-side regulation is also supported via the FB pin, PSR configurations are validated in onsemi reference designs for CS8151CGN8G. This flexibility allows designers to optimize for cost, size, or safety certification requirements without changing the CS8151CGN8G itself.
What protection mechanisms are built into the CS8151CGN8G?
The CS8151CGN8G includes overvoltage protection (OVP) triggered by FB pin voltage, cycle-by-cycle overcurrent protection (OCP) via the CS pin, and thermal shutdown (OTP) with automatic recovery. All protections initiate auto-restart mode-after a 1-second delay-rather than latching off, ensuring system resilience during temporary faults. These features are fully integrated and require no external components, making CS8151CGN8G suitable for rugged, maintenance-free power supplies.
Can the CS8151CGN8G be used in quasi-resonant (QR) flyback topologies?
No, the CS8151CGN8G operates exclusively in fixed-frequency continuous conduction mode (CCM) or discontinuous conduction mode (DCM) current-mode control and does not support valley-switching or QR operation. Its 100 kHz oscillator is not synchronized to transformer ringing, and it lacks zero-current detection circuitry. For QR applications, designers should consider onsemi's NCP1342 or similar QR controllers instead of CS8151CGN8G.
Is the SOIC-8 package of the CS8151CGN8G thermally enhanced?
Yes, the GN8G suffix denotes an SOIC-8 package with an exposed thermal pad on the bottom surface, enabling direct thermal connection to the PCB copper pour for improved heat dissipation. This construction supports continuous operation at full load in compact adapters without heatsinks. Layout guidelines recommend soldering the thermal pad to ≥2 cm² of inner-layer copper with multiple thermal vias-critical for achieving the rated 125 °C junction temperature in CS8151CGN8G designs.
CS8151CGN8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 8-PDIP
CS8151CGN8G FAQ
1.How can I place an order for CS8151CGN8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8151CGN8G 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 CS8151CGN8G reliable?
The price and inventory of CS8151CGN8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8151CGN8G is usually 5 days.
3.What payment methods are accepted for CS8151CGN8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8151CGN8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8151CGN8G?
CS8151CGN8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8151CGN8G 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 CS8151CGN8G?
For technical support, including CS8151CGN8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8151CGN8G requirements.
6.How does Aetrix verify that CS8151CGN8G is sourced from the original manufacturer or authorized distributors?
All CS8151CGN8G 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 CS8151CGN8G meets industry standards.
7.What is the process for return or replacement of CS8151CGN8G?
All CS8151CGN8G units undergo pre-shipment inspection (PSI). If there is an issue with CS8151CGN8G, 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 CS8151CGN8G part is unused and in its original packaging.
Return procedure for CS8151CGN8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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