Diodes Incorporated AP3190TW6-7

Overview

AP3190TW6-7 from Diodes Incorporated is a primary-side regulated (PSR) AC/DC switching mode power supply controller in SOT26 (Type SM) package, designed for cost-effective offline adapters requiring high light-load efficiency and CV/CC regulation. It delivers 65 mW no-load input power at high line, supports QR/AM multi-mode operation (60 kHz at high line, 80 kHz at low line), and integrates VCC OVP, output OVP, SCP, and adjustable external OTP via NTC resistor - used in set-top box and power tool power supplies.

For engineers reviewing the AP3190TW6-7 datasheet, AP3190TW6-7 pinout, AP3190TW6-7 application, or AP3190TW6-7 equivalent, key selection criteria include PSR-based optocoupler-free topology, fixed-frequency vs. QR mode transition thresholds, FB-based valley detection timing, CS pin current-sense threshold variation across line conditions, and OTP hysteresis (0.5 V shutdown / 0.75 V recovery).

Technical Context

The AP3190TW6-7 implements primary-side regulation using auxiliary winding voltage sampling at the FB pin to derive output voltage and demagnetization timing for QR control. Its CV loop regulates based on 2.74 V typical FB threshold, while CC regulation relies on CS pin peak current sensing with three programmable VCS thresholds (281–1232 mV) tied to line voltage and load condition.

Multi-mode operation dynamically shifts between QR (heavy load, low line), AM2 (medium load), and PFM (light load), with frequency scaling (54–88 kHz) and tSAMPLE adjustment (51–67% of t_ON) to optimize efficiency and EMI. Valley turn-on detection via FB pin enables soft-switching, reducing MOSFET switching loss and radiated emissions without added components.

Key Specifications

Pinout & Package

SOT26 (Type SM) package: 6-pin surface-mount, 1.10 mm height, 2.95 mm × 1.65 mm body, matte tin-plated leads, MSL Level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSR AC/DC controller applications.

Compared with MP6004DJ-LF-Z and CR6853D-000, the AP3190TW6-7 uniquely combines QR valley detection, programmable OTP hysteresis, and line-compensated CC regulation - making it optimal for mid-power (10–30 W) adapters demanding both efficiency compliance and thermal safety without secondary-side components.

Availability

AP3190TW6-7 is available at Aetrix Electronics and suitable for power tools, set-top box power supplies, and network adaptors requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP3190TW6-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and environmental standards including RoHS 3 and halogen-free "Green" compliance.

The AP3190TW6-7 belongs to Diodes' PSR AC/DC controller product line, engineered specifically for cost-sensitive, high-efficiency offline adapters targeting consumer electronics and industrial power supplies with stringent no-load and thermal requirements.

FAQ

What is the purpose of the OTP pin on the AP3190TW6-7?

The OTP pin accepts an external NTC thermistor to enable adjustable overtemperature protection. An internal 100 μA current source develops a voltage across the NTC; when that voltage drops below 0.50 V (indicating high temperature), the IC shuts down. Recovery occurs at 0.75 V, providing 250 mV hysteresis to prevent thermal oscillation. This function is disabled during startup.

How does the AP3190TW6-7 achieve constant current regulation without secondary-side sensing?

It uses primary-side current sensing via the CS pin and auxiliary winding feedback at the FB pin to infer secondary current. The controller maintains a fixed relationship between V_CS, t_ON, and t_OFF to regulate output current. Line compensation (via R_FB1) corrects for input voltage-induced errors, achieving ±1% CC accuracy across universal AC input.

Can the AP3190TW6-7 operate in quasi-resonant mode across all input voltages?

No - QR mode is active only under heavy load and low-line conditions (e.g., 90 VAC). At high line or light load, it transitions to AM2 (fixed-frequency) or PFM modes. Valley detection is always performed via the FB pin, but QR switching is enabled only when t_OFF reaches zero and demagnetization timing satisfies valley criteria.

What protection features are implemented with auto-recovery behavior?

VCC overvoltage protection, FB overvoltage protection, output short-circuit protection, brown-in/brown-out detection, and CS short protection all trigger hiccup-mode auto-recovery. The IC disables switching, waits for fault removal, then attempts restart - repeating until normal operation resumes. Internal OTP uses hold-mode recovery instead.