Diodes Incorporated AP2001SL-U

Overview

AP2001SL-U from Diodes Incorporated is a monolithic dual-channel PWM controller IC designed for DC/DC converters and backlight inverters, featuring adjustable oscillator frequency up to 500 kHz, 2.5 V reference output with ±1% accuracy, under-voltage lockout (UVLO) with 2.45 V–2.65 V thresholds, and dual common-emitter pre-driver outputs rated for 20 mA sink/source.

For engineers reviewing the AP2001SL-U datasheet, AP2001SL-U pinout, AP2001SL-U application, or AP2001SL-U equivalent, key selection considerations include dead-time control range (0–100%), short-circuit protection latching behavior, SOP-16L thermal performance at 85°C ambient, and compatibility with external MOSFET gate drivers in dual-output buck-boost topologies.

Technical Context

The AP2001SL-U integrates two independent PWM channels with shared timing (RT/CT), separate error amplifiers (EA1+/EA1−, EA2+/EA2−), and dedicated dead-time comparators per channel. Its oscillator supports frequency tuning from 1 kHz to 500 kHz via external RT (5.1–100 kΩ) and CT (150–15,000 pF) components, while internal bandgap reference (2.5 V ±1%) feeds both feedback loops.

Each channel features CE-type open-collector outputs (OUT1/OUT2) capable of sinking 90 mA short-circuit current and 20 mA continuous, with UVLO disabling both outputs below 2.45 V VCC and SCP triggering at 0.7 V FB input. The DTC pins accept 0–2.3 V analog control to linearly adjust dead time across full duty-cycle range.

Key Specifications

Pinout & Package

SOP-16L (Small Outline Package, 16-pin, lead-free, RoHS-compliant) with 1.27 mm pitch and standard JEDEC MS-012AC footprint. Thermal pad not present; power dissipation limited to 0.75 W at 85°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel PWM controller applications.

Compared with UC3846N and TL5001CP, the AP2001SL-U uniquely delivers dual independent PWM control with analog-adjustable dead time in one SOP-16L package-reducing design complexity for multi-rail systems while maintaining 40 V input tolerance and latch-type SCP.

Availability

AP2001SL-U is available at Aetrix Electronics and suitable for laptop DC/DC power supplies, LED backlight inverters, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP2001SL-U 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The AP2001 belongs to Diodes' power management controller product line, engineered specifically for compact, high-efficiency dual-output DC/DC conversion in computing, display, and industrial equipment.

FAQ

What is the maximum allowable timing capacitor value for stable 500 kHz operation?

The datasheet specifies CT ≤ 15,000 pF for reliable oscillator operation across temperature and voltage. At 500 kHz with RT = 5.1 kΩ, CT = 330 pF is typical; using 15,000 pF would reduce frequency to ~10 kHz. For 500 kHz, CT must be ≤ 330 pF with corresponding RT trim to maintain accuracy and jitter performance.

Can AP2001SL-U drive MOSFET gates directly without external drivers?

No. The AP2001SL-U provides open-collector NPN pre-driver outputs (OUT1/OUT2) rated for 20 mA continuous sink current. It lacks high-current gate-drive capability or level-shifting; external NPN/PNP pairs or dedicated gate drivers (e.g., TC4420) are required for logic-level or high-side MOSFET switching.

How does the SCP function interact with the DTC pins during fault recovery?

SCP latching is independent of DTC voltage. When SCP triggers (FB < 0.7 V), both OUT1/OUT2 disable and remain latched until VCC cycles below UVLO or SCP pin is actively pulled low. DTC inputs retain their analog voltage but have no effect until SCP reset occurs and normal PWM operation resumes.

Is the 2.5 V REF pin internally decoupled, or does it require an external capacitor?

The REF pin requires an external 1 µF ceramic capacitor to ground for stability, as confirmed in the Typical Application Circuit (page 7). Without this capacitor, reference ripple increases >10 mV, degrading feedback accuracy and causing output regulation drift, especially under dynamic load conditions.