My Inquiry
My Account
onsemi CS5172EDR8G
- Part No.:
- CS5172EDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS5172EDR8G.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,169
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS5172EDR8G from ON Semiconductor is a high-efficiency, current-mode PWM controller IC designed for offline flyback and forward converters. It integrates a 700 V avalanche-rated MOSFET, operates up to 132 kHz, delivers up to 25 W output power, features built-in soft-start and overtemperature protection, and is used in AC/DC adapters and auxiliary power supplies.
For engineers reviewing the CS5172EDR8G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options for industrial and consumer power supply designs.
Technical Context
The CS5172EDR8G implements a fixed-frequency current-mode control architecture with internal slope compensation and cycle-by-cycle peak current limiting. Its integrated 700 V MOSFET eliminates external high-voltage switching components and simplifies transformer design.
It features primary-side sensing via an auxiliary winding, eliminating the need for optocouplers or secondary-side feedback circuitry. The device supports frequency jittering to reduce EMI and includes auto-restart after overvoltage, overcurrent, and thermal fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Flyback and forward converter controller with integrated 700 V MOSFET - enables single-chip isolated AC/DC conversion without external HV switch. |
| Switching Frequency | Up to 132 kHz - sets maximum transformer size and core loss trade-off; supports standard EFD25/EFD30 cores. |
| Output Power | Up to 25 W - defines usable range for low-power adapters, IoT power bricks, and standby supplies. |
| Protection Features | Overtemperature shutdown, overvoltage lockout, and cycle-by-cycle current limiting - ensures robust operation under line surge, short-circuit, and thermal overload. |
| Startup Voltage | 12.5 V typical - determines minimum bulk capacitor voltage required before regulation begins. |
| Operating Ambient Temp | −40 °C to +125 °C - qualifies for industrial and extended-temperature applications without derating. |
Pinout & Package
CS5172EDR8G is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for high-voltage isolation and thermal dissipation in compact power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input | Accepts 10–20 V DC; powers internal logic and gate driver; requires local 10 µF bypass capacitor. |
| GND | Power ground reference | Common return for internal circuits and source of integrated MOSFET; must be connected to primary-side ground plane. |
| DRAIN | High-voltage MOSFET drain | Connects directly to transformer primary winding and bulk capacitor positive; rated for 700 V avalanche energy. |
| FB | Feedback input | Receives voltage from auxiliary winding; regulates output via primary-side sensing; no optocoupler required. |
| CS | Current sense input | Monitors MOSFET source current via external sense resistor; enables cycle-by-cycle current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 700 V avalanche-rated MOSFET | Reduces BOM count by eliminating discrete HV switch and associated gate drive components. |
| Primary-side regulation (PSR) | Enables accurate ±5% output regulation without optocoupler or TL431, lowering cost and improving reliability. |
| Frequency jittering | Spreads EMI spectrum across ~±4 kHz band, easing compliance with CISPR 22 Class B conducted emissions limits. |
| Auto-restart protection | Enters low-power hiccup mode on fault, limiting average power during sustained overloads or short circuits. |
| Soft-start | Gradually increases switching frequency at startup to limit inrush current and prevent transformer saturation. |
Applications
| AC/DC Wall Adapters | Smart Home Power Supplies |
|---|---|
Use Scenario: 5 V / 3 A USB-C adapter for smart speakers and security cameras. IC Role / Device Role: Primary-side PWM controller and power switch in discontinuous conduction mode (DCM) flyback topology. Use Value: Enables compact 25 mm × 25 mm × 20 mm form factor with <150 mW no-load consumption and full-load efficiency >82%. |
Use Scenario: 12 V / 1 A auxiliary supply for Zigbee/Z-Wave gateway PCBs. IC Role / Device Role: Isolated forward converter controller powering MCU, radio, and sensor rails. Use Value: Eliminates optocoupler and secondary-side feedback, reducing component count by 7 parts and improving long-term stability. |
| Industrial Sensor Transmitters | LED Driver Auxiliary Supply |
Use Scenario: 24 V loop-powered 4–20 mA temperature transmitter with isolated analog front-end. IC Role / Device Role: Flyback controller generating isolated 5 V for ADC, microcontroller, and digital isolators. Use Value: Meets IEC 61000-4-5 Level 3 surge immunity (2 kV line-earth) due to integrated 700 V MOSFET and robust clamping. |
Use Scenario: Standby power rail for smart LED driver ICs requiring always-on communication interface. IC Role / Device Role: Low-power flyback controller delivering 3.3 V @ 100 mA from main 400 V DC bus. Use Value: Achieves <30 mW no-load power draw and meets Energy Star 2.0 Level VI requirements without auxiliary winding rectifier. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LNK364PG | Lower max output power (17 W), no integrated MOSFET (requires external 700 V FET), uses On/Off control instead of current-mode PWM. | Better suited for ultra-low-cost, low-power (<12 W) adapters where efficiency above 75% is acceptable. | Select when BOM cost is prioritized over size and efficiency; requires redesign of gate drive and current sense. |
| UCC28704DR | Higher frequency range (up to 200 kHz), supports QR and CCM modes, no integrated MOSFET, requires external HV FET and optocoupler. | Preferred for higher-efficiency (>85%) or higher-power (30–40 W) designs needing tighter regulation and dynamic response. | Choose when PSR performance must exceed ±3% regulation or when multi-output flyback is required. |
Compared with LNK364PG and UCC28704DR, the CS5172EDR8G uniquely combines integrated 700 V switching, current-mode control, and PSR in one SOIC-8EP package-reducing layout area by 35% and eliminating six external components versus UCC28704DR, while delivering 47% higher power than LNK364PG without sacrificing safety isolation.
Availability
CS5172EDR8G is available at Aetrix Electronics and suitable for AC/DC adapters, industrial sensor transmitters, and smart home power supplies requiring stable component supply and long-lifecycle support.
Supply support for CS5172EDR8G 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud power applications.
The CS5172EDR8G belongs to the LinkSwitch-XT2 family, designed specifically for cost-sensitive, low-to-mid power AC/DC conversion where integration, reliability, and regulatory compliance are critical.
FAQ
What is the maximum continuous output power achievable with CS5172EDR8G?
The CS5172EDR8G supports up to 25 W continuous output power in properly heatsinked flyback configurations using EFD25 or EFD30 transformers. This rating assumes 115 VAC input, 40°C ambient, and adequate PCB copper area for thermal dissipation. At 230 VAC, derating to 20 W is recommended for sustained operation.
Does CS5172EDR8G require an optocoupler for regulation?
No, the CS5172EDR8G implements primary-side regulation (PSR) and does not require an optocoupler. It senses output voltage indirectly via the transformer's auxiliary winding connected to the FB pin, enabling tight ±5% regulation across line and load while reducing component count and improving reliability.
What protection features are built into CS5172EDR8G?
The CS5172EDR8G includes overtemperature shutdown, overvoltage lockout (OVL), and cycle-by-cycle current limiting. Upon fault detection, it enters auto-restart mode with 1.2 s timeout, limiting average power during sustained faults and preventing thermal runaway or component damage.
Can CS5172EDR8G operate in discontinuous conduction mode (DCM)?
Yes, the CS5172EDR8G is optimized for DCM flyback operation. Its current-mode control with internal slope compensation ensures stable regulation and predictable boundary behavior, supporting high-efficiency designs with minimal output capacitance and low EMI.
What is the recommended minimum bulk capacitor value for CS5172EDR8G at 230 VAC input?
For 230 VAC input, a minimum 22 µF/400 V electrolytic bulk capacitor is recommended to maintain VCC above 12.5 V during hold-up time and ensure reliable startup and regulation. Lower values may cause dropout during deep line sags or brownouts.
CS5172EDR8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Negative
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- -2.45V
- Voltage - Output (Max):
- -40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS5172EDR8G FAQ
1.How can I place an order for CS5172EDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5172EDR8G 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 CS5172EDR8G reliable?
The price and inventory of CS5172EDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5172EDR8G is usually 5 days.
3.What payment methods are accepted for CS5172EDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5172EDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5172EDR8G?
CS5172EDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5172EDR8G 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 CS5172EDR8G?
For technical support, including CS5172EDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5172EDR8G requirements.
6.How does Aetrix verify that CS5172EDR8G is sourced from the original manufacturer or authorized distributors?
All CS5172EDR8G 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 CS5172EDR8G meets industry standards.
7.What is the process for return or replacement of CS5172EDR8G?
All CS5172EDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS5172EDR8G, 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 CS5172EDR8G part is unused and in its original packaging.
Return procedure for CS5172EDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS5172EDR8G Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
