Diodes Incorporated AZ494CMTR-E1

Overview

AZ494CMTR-E1 from BCD Semiconductor Manufacturing Limited is a voltage-mode PWM controller IC designed for switching power supply regulation, featuring a 5.0 V ±1% trimmed reference, dual error amplifiers, on-chip oscillator with adjustable frequency (1–200 kHz), dead-time control comparator, and push-pull or single-ended output selection via CTRL pin. It supports SMPS, backlight inverters, and battery chargers.

For engineers reviewing the AZ494CMTR-E1 datasheet, AZ494CMTR-E1 pinout, AZ494CMTR-E1 application, or AZ494CMTR-E1 equivalent, key selection criteria include reference accuracy (±1%), oscillator timing flexibility (RT/CT programmable), dual-error-amplifier architecture for multi-loop control, and 200 mA sink/source capability at TR output.

Technical Context

The AZ494CMTR-E1 implements voltage-mode PWM control using two independent error amplifiers-one for primary output regulation and one for auxiliary or current-sense feedback-feeding into a shared PWM comparator. Its oscillator supports master/slave synchronization via RT/CT pins and delivers precise duty-cycle control with built-in dead-time limiting to prevent shoot-through in push-pull topologies.

Internal circuitry enforces single-pulse operation per clock cycle at both outputs, eliminating double-pulsing risks. The 5.0 V reference (AZ494C variant) is trimmed for ±1% accuracy over –40°C to +85°C, and the uncommitted TR output provides 200 mA sink/source drive for external transistor bases or gate drivers.

Key Specifications

Pinout & Package

Package: SOIC-16 (M), RoHS-compliant lead-free (E1 suffix), 1.27 mm pitch, 10.2 × 6.24 mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC3844B and TL494, the AZ494CMTR-E1 offers tighter reference accuracy (±1%), integrated TR output drive, and confirmed RoHS compliance (E1 suffix), making it preferable for new industrial SMPS designs requiring long-term component stability and regulatory alignment.

Availability

AZ494CMTR-E1 is available at Aetrix Electronics and suitable for AC-DC adapters, LCD backlight inverters, and battery charger systems requiring stable component supply, consistent parametric performance across temperature, and RoHS-compliant packaging.

Supply support for AZ494CMTR-E1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-reliability, cost-optimized controllers and drivers for power conversion.

The AZ494 series belongs to BCD's PWM controller product line, engineered specifically for industrial and consumer switching power supplies requiring dual-loop regulation, programmable timing, and robust push-pull drive capability.

FAQ

What is the function of the OUTPUT CTRL pin (Pin 13) on AZ494CMTR-E1?

Pin 13 selects output configuration: grounding it enables single-ended or parallel operation of C1 and C2 outputs, while connecting it to REF (5 V) enables standard push-pull mode with complementary phase and dead-time control. This hardware-selectable feature eliminates need for external logic or configuration registers.

Can AZ494CMTR-E1 operate with a 50 V input supply?

No. The absolute maximum VCC rating is 40 V, and recommended operating VCC is 7–36 V. Applying 50 V exceeds stress limits and may cause permanent damage. For >36 V input applications, use an external LDO or resistor-zener clamp to regulate VCC to ≤36 V before connecting to Pin 14.

How does the dead-time control (DTC) pin affect output timing?

The DTC pin (Pin 4) sets minimum off-time between C1 and C2 transitions. When DTC voltage drops below 3.3 V, maximum duty cycle reduces to 45%; at 0 V, duty cycle approaches zero. This prevents simultaneous conduction in push-pull configurations, protecting external switching devices from shoot-through failure.

Is the REF pin (Pin 12) intended for external load connection?

Yes - Pin 12 delivers 5.0 V ±1% with up to 10 mA output current, sufficient to bias feedback dividers, optocoupler LEDs, or auxiliary circuitry. Load regulation is specified at 1–10 mA, and exceeding 10 mA degrades accuracy beyond ±1.5%. External decoupling (e.g., 1 µF ceramic) is recommended near the pin.