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Texas Instruments UCC28528DW
- Part No.:
- UCC28528DW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28528DW.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UCC28528DW from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM control in a single 20-pin SOIC (DW) package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:1 PFC:PWM frequency ratio up to 240 kHz, enables programmable maximum duty cycle up to 80%, and features zero power detect for auxiliary supply shutdown - designed specifically for AC-DC standby converters.
For engineers reviewing the UCC28528DW datasheet, UCC28528DW pinout, UCC28528DW application, or UCC28528DW equivalent, key selection criteria include its continuous PWM operation during bulk voltage decay, trailing-edge modulation architecture, input voltage feedforward implementation, and dedicated soft-start and power limiting for low-power auxiliary supplies.
Technical Context
The UCC28528DW implements a two-stage control architecture: the PFC section uses average-current-mode control with a highly linear three-input multiplier, transconductance voltage amplifier (gM = 70–130 µS), and input voltage feedforward (VFF) to achieve near-unity power factor across line/load variations; it includes zero power detect (threshold: 0.20–0.50 V on VAOUT) and accurate power limiting via IMOUT × VFF.
The PWM stage employs peak-current-mode control with programmable soft-start (SS2 charge current: −7.0 to −14.0 µA), adjustable maximum duty cycle clamp (70–80% at D_MAX = 4.15 V), and independent UVLO2 (turn-off at 5.30 V, hysteresis 1.45 V) - enabling uninterrupted operation until bias drops below UVLO, distinguishing it from UCC28521 which shuts down PWM at 71% bulk voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC/PWM Frequency Ratio | 1:1 fixed ratio; PWM and PFC operate at same oscillator frequency (160–240 kHz), simplifying EMI filter design and synchronization. |
| Gate Drive Capability | 2-A source / 3-A sink per output (GT1, GT2); drives MOSFETs directly without external buffers in typical 65–100 W auxiliary supplies. |
| Maximum PWM Duty Cycle | 70–80% (typ. 75%) at D_MAX = 4.15 V; prevents transformer saturation and enables precise output regulation in flyback topologies. |
| Zero Power Detect Threshold | 0.20–0.50 V on VAOUT (falling edge); disables PFC gate drive when output load falls below standby threshold, reducing no-load consumption. |
| UVLO2 Turn-Off Voltage | 5.30 V (typ.), hysteresis 1.45 V; sustains PWM operation down to low bias voltage, supporting extended hold-up time in auxiliary rails. |
| PFC Voltage Amplifier gM | 70–130 µS; provides high loop gain and fast transient response for stable 380 V DC bus regulation under dynamic load steps. |
| Operating Temperature Range | −40°C to +105°C; qualified for industrial-grade embedded power supplies requiring long-term reliability in convection-cooled enclosures. |
Pinout & Package
UCC28528DW is housed in a 20-pin SOIC (DW) package with 0.65 mm pitch, thermal impedance θJA = 84.3 °C/W (low-K PCB), rated for 1.5 W at TA < 25°C and 0.5 W at TA = 105°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem pole; drives boost MOSFET with 16 ns rise / 7 ns fall into 1 nF load - minimizes switching loss in continuous conduction mode PFC. |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1; enables direct interface to flyback or forward converter primary-side MOSFET without level-shifting. |
| VSENSE (3) | PFC voltage feedback input | Inverting input of transconductance amplifier; senses DC bus voltage via resistor divider; ±120 mV hysteresis enables fast recovery from overvoltage events. |
| VAOUT (1) | PFC voltage amplifier output | Transconductance output (0–5.5 V range); sources/sinks up to 3.3 mA during slew enhancement; connects to multiplier and zero power comparator. |
| IAC (18) | Line voltage sensing input | Current input proportional to rectified AC line; max 500 µA; enables input voltage feedforward for constant power regulation across 85–265 VAC. |
| VFF (19) | Voltage feedforward output | Current mirror output (IAC/2); generates feedforward signal across external RC filter; sets VFF = 1.4 V at low line for optimal multiplier linearity. |
| SS2 (13) | PWM soft-start input | Capacitor-programmed ramp; internal −10.5 µA current charges SS2 to 3 V, controlling GT2 duty cycle ramp time for inrush-limited startup. |
| D_MAX (4) | PWM duty cycle clamp input | Analog voltage input (0.09–0.90 ratio); sets maximum GT2 duty cycle linearly; 4.15 V yields 75% clamping - prevents transformer core reset failure. |
| ISENSE2 (8) | PWM current sense input | Peak current limit comparator input; 1.30–1.45 V threshold with 1.5 V internal level shift; rejects noise while enabling accurate cycle-by-cycle current limiting. |
| VREF (20) | Internal reference output | 7.5 V ±1.5% precision reference; supplies internal circuitry and external resistive dividers; delivers >10 mA with 5 mV load regulation up to 6 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Trailing-edge PFC & PWM modulation | Eliminates subharmonic oscillation without slope compensation in PFC; enables stable peak-current-mode PWM with minimal external components. |
| Independent PWM UVLO2 | Turn-off at 5.30 V with 1.45 V hysteresis ensures auxiliary supply remains active through brownout conditions where main PFC bus decays. |
| Programmable soft-start (SS2) | Capacitor-timed ramp controls GT2 duty cycle from 0% to clamped maximum - prevents inrush current in low-power flyback secondaries. |
| Zero power detect | Disables PFC gate drive when VAOUT falls below 0.33 V - reduces standby power to <100 mW in compliance with Energy Star Level VI. |
| Average-current-mode PFC control | Three-input linearized multiplier + transconductance voltage amplifier delivers <5% THD at full load, meeting IEC 61000-3-2 Class D limits. |
Applications
| Server Standby Power Supply | Telecom Auxiliary Bias Rail |
|---|---|
Use Scenario: Provides regulated 12 V or 5 V auxiliary power during main converter standby or fault condition in multi-rail server PSUs. IC Role / Device Role / Timing Role: Dual-stage controller managing boost PFC front-end and isolated flyback PWM stage with synchronized trailing-edge modulation. Use Value: Continuous PWM operation down to 5.3 V bias enables >20 ms hold-up time at 10% load, satisfying ATX12VO and NEBS GR-63-CORE requirements. |
Use Scenario: Powers control logic, fans, and monitoring circuits in telecom rectifiers during AC mains interruption. IC Role / Device Role / Timing Role: PFC+PWM combo IC delivering regulated output from universal AC input while maintaining low no-load consumption. Use Value: Zero power detect reduces standby dissipation to <75 mW; 1:1 frequency ratio simplifies EMI filter design for EN 55032 Class B compliance. |
| Industrial PLC Auxiliary Converter | Medical Equipment Low-Power Isolated Supply |
Use Scenario: Generates isolated 3.3 V or 5 V for microcontroller, I/O, and communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Integrated PFC/PWM controller implementing average-current PFC and peak-current flyback control in single IC. Use Value: −40°C to +105°C operating range and 84.3 °C/W thermal resistance ensure reliable operation in sealed, fanless enclosures. |
Use Scenario: Supplies safety-isolated logic power in diagnostic imaging or patient-monitoring devices requiring reinforced insulation. IC Role / Device Role / Timing Role: Controls boost PFC and transformer-isolated flyback with independent UVLO2 for fail-safe shutdown sequencing. Use Value: Programmable D_MAX clamp (70–80%) and precise 1.30 V current limit threshold support 2×MOPP creepage/clearance designs with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28521DW | Same 20-pin DW package and 1:1 frequency ratio, but PWM stage shuts off at 71% of nominal bulk voltage; lacks continuous low-voltage PWM operation. | Targeted for main DC-DC converters requiring coordinated PFC/PWM shutdown; unsuitable for auxiliary supplies needing extended hold-up. | Select UCC28521DW only when system architecture requires simultaneous PFC and PWM disable during brownout. |
| ICE3PCS01G | Fixed-frequency CCM PFC + quasi-resonant PWM controller in PG-DSO-16; no zero power detect; lower gate drive (0.5 A sink). | Optimized for cost-sensitive consumer adapters; lacks programmable D_MAX clamp and independent UVLO2 for auxiliary use cases. | Choose ICE3PCS01G for high-volume, non-industrial applications where standby power >200 mW is acceptable. |
Compared with UCC28521DW and ICE3PCS01G, the UCC28528DW uniquely supports uninterrupted PWM operation during bulk decay and integrates zero power detect - making it the only option among the three qualified for Energy Star Level VI-compliant auxiliary supplies with <100 mW no-load consumption.
Availability
UCC28528DW is available at Aetrix Electronics and suitable for server standby power supplies, telecom auxiliary bias rails, and industrial PLC auxiliary converters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for UCC28528DW 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 expertise in high-reliability power conversion ICs.
The UCC28528DW belongs to TI's UCC285xx family of combination PFC/PWM controllers, engineered specifically for energy-efficient auxiliary and standby power supplies requiring IEC 61000-3-2 compliance and ultra-low no-load power.
FAQ
What is the key functional difference between UCC28528DW and UCC28521DW?
The UCC28528DW maintains PWM stage operation until VCC drops below its UVLO2 turn-off threshold (5.30 V), whereas the UCC28521DW disables PWM when the PFC output voltage falls to 71% of nominal bulk voltage. This makes UCC28528DW suitable for auxiliary supplies requiring extended hold-up time, while UCC28521DW targets main converter applications with coordinated shutdown. Both share identical pinout, package, and PFC architecture.
How does the zero power detect feature work in UCC28528DW?
The UCC28528DW monitors VAOUT voltage: when it falls below 0.20–0.50 V (falling edge), the internal zero power detect comparator disables GT1 gate drive, halting PFC operation. This occurs before UVLO activation, reducing no-load consumption to <100 mW. The feature is enabled by default and requires no external configuration - it is intrinsic to the UCC28528DW's auxiliary supply design intent.
Can UCC28528DW be used in discontinuous conduction mode (DCM) PFC applications?
No - the UCC28528DW is explicitly designed for continuous conduction mode (CCM) PFC operation using average-current-mode control. Its multiplier architecture, transconductance voltage amplifier, and current sensing topology assume CCM waveforms. DCM operation would cause instability and inaccurate current regulation; TI specifies CCM-only use in SLUS608D Section 1.1 and Application Diagram Figure 1.
What is the purpose of the CT_BUFF pin (Pin 5) in UCC28528DW?
The CT_BUFF pin outputs a buffered 4-V amplitude oscillator ramp signal synchronized to the PWM stage. It is used to inject slope compensation into the ISENSE2 current sense node via an external resistor, preventing subharmonic oscillation in peak-current-mode flyback converters. Unlike raw oscillator signals, CT_BUFF can drive a 500-µA resistive load directly without buffering.
Does UCC28528DW support programmable PFC frequency independent of PWM frequency?
No - the UCC28528DW implements a fixed 1:1 PFC:PWM frequency ratio. Both stages operate at the same frequency set by the RT resistor (160–240 kHz). There is no provision for independent PFC frequency programming; this architecture simplifies timing alignment and EMI filtering but precludes asynchronous operation. The datasheet confirms this in "AVAILABLE OPTIONS" and Block Diagram labels.
UCC28528DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 100 µA
- Voltage - Supply:
- 9.7V ~ 18V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UCC28528DW FAQ
1.How can I place an order for UCC28528DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28528DW 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 UCC28528DW reliable?
The price and inventory of UCC28528DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28528DW is usually 5 days.
3.What payment methods are accepted for UCC28528DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28528DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28528DW?
UCC28528DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28528DW 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 UCC28528DW?
For technical support, including UCC28528DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28528DW requirements.
6.How does Aetrix verify that UCC28528DW is sourced from the original manufacturer or authorized distributors?
All UCC28528DW 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 UCC28528DW meets industry standards.
7.What is the process for return or replacement of UCC28528DW?
All UCC28528DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC28528DW, 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 UCC28528DW part is unused and in its original packaging.
Return procedure for UCC28528DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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