Diodes Incorporated AZ7500BMTR-E1

Overview

AZ7500BMTR-E1 from Diodes Incorporated is a voltage-mode PWM controller IC for switching power supplies, featuring a trimmed 4.95V ±1% reference, dual error amplifiers, on-chip oscillator (1–200 kHz), dead-time control comparator, and push-pull/single-ended output selection via CTRL pin. It delivers 200mA sink/source capability at the TR output and operates across 7–36V supply range for industrial SMPS and backlight inverters.

For engineers reviewing the AZ7500BMTR-E1 datasheet, AZ7500BMTR-E1 pinout, AZ7500BMTR-E1 application, or AZ7500BMTR-E1 equivalent, key selection considerations include reference accuracy (±1%), oscillator frequency adjustability via RT/CT, dual-error-amplifier architecture for multi-loop regulation, and SO-16 package thermal performance (RθJA = 73°C/W).

Technical Context

The AZ7500B implements voltage-mode PWM control with two independent error amplifiers enabling simultaneous regulation of primary and auxiliary outputs - one referenced to VREF (4.95V), the other configurable via external feedback. Its oscillator supports master/slave synchronization through CT/RT pins, and the DTC comparator enforces minimum off-time to prevent shoot-through in push-pull topologies.

Output stage uses open-collector NPN transistors (E1/E2) with 200mA rating and 1.1V typical VCE(sat), while the uncommitted TR output provides 200mA sink/source for gate driving or auxiliary control. The internal 0.7mA reference bias current and 0.3mA max feedback input current support high-impedance sensing networks.

Key Specifications

Pinout & Package

Package: SO-16 (3.9 mm × 9.9 mm, 1.27 mm pitch, RoHS-compliant lead-free finish).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC3842B and TL494, the AZ7500BMTR-E1 offers superior reference accuracy (±1% vs ±2%), flexible oscillator tuning, and dual error amplifiers - making it optimal for multi-output or precision industrial SMPS where regulation stability and topology flexibility are critical.

Availability

AZ7500BMTR-E1 is available at Aetrix Electronics and suitable for AC-DC adapters, LCD backlight inverters, and industrial DC-DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AZ7500BMTR-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

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 Malaysia.

The AZ7500B belongs to Diodes' power management controller product line, engineered specifically for robust, high-efficiency switching power supplies in industrial, computing, and display applications.

FAQ

What is the maximum allowable oscillator frequency for AZ7500BMTR-E1?

The absolute maximum oscillator frequency is 200 kHz, achieved with CT = 470 pF and RT = 1.8 kΩ. At this setting, the device maintains stable PWM operation and meets timing specifications for dead-time control and output steering. Operation above 200 kHz risks reduced duty-cycle resolution and increased propagation delay uncertainty.

Can AZ7500BMTR-E1 be used in current-mode control topologies?

No - the AZ7500BMTR-E1 is strictly a voltage-mode PWM controller. It lacks a current-sense comparator, slope compensation input, or peak-current detection circuitry. Its error amplifiers compare voltage feedback signals only, and the PWM comparator compares the oscillator ramp against the amplified error voltage.

How does the CTRL pin determine push-pull vs. single-ended operation?

When CTRL (pin 13) is tied to GND, outputs C1 and C2 operate in parallel (single-ended). When CTRL is tied to VREF (pin 11), the internal pulse-steering flip-flop alternates conduction between C1 and C2, enabling true push-pull operation with inherent dead-time insertion via the DTC comparator.

Is AZ7500BMTR-E1 pin-compatible with AZ7500CMTR-E1?

Yes - both share identical SO-16 pinout and electrical characteristics except for reference voltage: AZ7500B specifies 4.95V ±1%, while AZ7500C specifies 5.00V ±1%. Swapping requires verifying that downstream feedback dividers maintain target output voltage within tolerance.