Texas Instruments UCC2817APW

Overview

UCC2817APW from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, operating across –40°C to 85°C with 12–18 V VCC supply, 16 V UVLO turn-on threshold, 7.5 V reference output, and ±1.2 A peak gate drive capability. It enables IEC 61000-3-2-compliant <300 W AC-DC supplies in PC power, lighting, and industrial systems.

For engineers reviewing the UCC2817APW datasheet, UCC2817APW pinout, UCC2817APW application, or UCC2817APW equivalent, key selection considerations include its extended temperature rating vs. UCC3817A, average current mode control architecture, integrated OVP/EN window comparator, and TSSOP-16 package compatibility with space-constrained PFC stages.

Technical Context

The UCC2817APW implements average current-mode control using a high-gain current amplifier (90 dB open-loop gain, ±2 mV offset), a precision 7.5 V reference (±1.5% over temperature), and a multiplier with feed-forward line regulation (VFF input). Its oscillator supports 6–220 kHz via RT/CT programming, and zero-power detection latches DRVOUT low when VAOUT falls below 0.33 V.

It integrates leading-edge PWM modulation synchronized to the boost switch zero-current crossing, reducing bulk capacitor ripple. The OVP/EN pin provides dual-function protection: disabling switching above 1.07×VREF + 500 mV hysteresis or forcing soft-start reset when pulled below 1.9 V.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body size), thermally enhanced for surface-mount PFC stage integration with 0.65 mm lead pitch and exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power factor correction controller applications.

Compared with UCC2817APW, UCC2818APW offers lower UVLO for fixed-supply systems but lacks shunt regulator capability, while UC3854BDW delivers higher power scalability at the expense of integration, requiring external reference, OVP, and soft-start circuitry.

Availability

UCC2817APW is available at Aetrix Electronics and suitable for PC power supplies, LED lighting drivers, industrial AC-DC modules, and consumer audio power supplies requiring stable component supply across extended temperature ranges and IEC 61000-3-2 compliance.

Supply support for UCC2817APW 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 company designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The UCC2817APW belongs to TI's UCCx81xA BiCMOS PFC controller family, engineered specifically for high-efficiency, near-unity power factor boost preregulators in sub-300 W IEC 61000-3-2-compliant AC-DC systems.

FAQ

What is the operating temperature range of the UCC2817APW?

The UCC2817APW is rated for operation from –40°C to +85°C, making it suitable for industrial and outdoor applications where ambient temperatures exceed standard commercial grade limits. This extended range distinguishes it from the UCC3817APW (0°C to 70°C) and confirms its qualification for harsh-environment deployments. The UCC2817APW maintains full electrical specifications across this entire range.

How does the UCC2817APW implement overvoltage protection?

The UCC2817APW uses the OVP/EN pin as a dual-function window comparator: it disables DRVOUT when the sensed voltage exceeds 1.07×VREF + 500 mV hysteresis (≈8.0 V typical), and forces soft-start reset when pulled below 1.9 V. This integrated protection eliminates need for external comparators or latch circuits. The UCC2817APW responds within 500 ns propagation delay to overvoltage events.

Can the UCC2817APW be used with a bootstrap VCC supply?

Yes - the UCC2817APW includes an on-chip shunt regulator and low 150 µA typical start-up current, enabling direct bootstrap operation from the boost diode output. Its 16 V UVLO turn-on threshold ensures reliable start-up even with falling VCC during light-load conditions. The UCC2817APW sustains regulation down to 12 V VCC, unlike UCC2818APW which requires a fixed supply.

What is the purpose of the VFF pin on the UCC2817APW?

The VFF (feed-forward voltage) pin on the UCC2817APW accepts a scaled RMS representation of the AC input voltage (1.4 V at low line, 4.7 V at high line) to dynamically adjust the current reference in the multiplier. This compensates for line voltage variations in real time, improving THD and maintaining tight output regulation across 85–265 VAC inputs without requiring software or additional analog circuitry.

Does the UCC2817APW support critical conduction mode (CRM)?

No - the UCC2817APW is designed exclusively for average current-mode control in continuous conduction mode (CCM) boost PFC. It lacks the zero-crossing detection and hysteretic control required for CRM operation. For CRM applications, TI recommends the UCC3819 or UCC38050 families. The UCC2817APW's architecture targets low-THD, high-efficiency CCM operation up to 300 W.