Diodes Incorporated AP3107ZMTR-G1

Overview

AP3107ZMTR-G1 from Diodes Incorporated is a high-voltage start-up, current-mode PWM controller for offline AC/DC flyback converters, featuring adaptive green mode operation (28 kHz minimum frequency), 65 kHz fixed switching frequency, 15 μA max start-up current, and integrated protections including OCP, VOVP, OTP, OLP, and brownout. It drives external MOSFETs in LCD TV power supplies and open-frame SMPS.

For engineers reviewing the AP3107ZMTR-G1 datasheet, AP3107ZMTR-G1 pinout, AP3107ZMTR-G1 application, or AP3107ZMTR-G1 equivalent, key selection criteria include HV pin start-up capability (600 V rating), SENSE pin LEB timing (250 ns typ), FB pin green mode threshold (2.1 V), and SO-7 thermal resistance (186 °C/W).

Technical Context

The AP3107ZMTR-G1 implements current-mode control with internal slope compensation and leading-edge blanking on the SENSE pin to suppress switching noise. Its oscillator integrates ±6% frequency dithering to reduce EMI and maintains 65 kHz center frequency across temperature and supply voltage variations (±5%).

Brownout protection is programmable via the BNO pin with 99 V turn-on threshold (R = 0 kΩ), while VCC UVLO operates at 16 V (on) / 8.6 V (off). Protection logic includes fast OCP with 25 μs fault filter, 4 ms OLP delay, and 140 °C OTP shutdown with 20 °C hysteresis.

Key Specifications

Pinout & Package

AP3107ZMTR-G1 is housed in a compact, RoHS-compliant SO-7 package (5.1 mm × 6.2 mm × 1.75 mm) with gull-wing leads and 1.27 mm pitch. The package supports surface-mount assembly and provides adequate thermal performance for up to 550 mW dissipation at ambient < 25 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP3107ZMTR-G1, AP3125MTR-G1 offers higher UVLO margins but forfeits brownout tuning, while ICE2QS03G integrates power switching at the cost of design flexibility and HV start-up simplicity.

Availability

AP3107ZMTR-G1 is available at Aetrix Electronics and suitable for AC/DC adaptors, LCD monitor power supplies, and open-frame switching power supplies requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP3107ZMTR-G1 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, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP3107Z series belongs to Diodes' high-voltage PWM controller product line, designed specifically for cost-sensitive, energy-efficient offline flyback converters targeting LCD/LED TV, monitor, and adapter applications.

FAQ

What is the purpose of the BNO pin on AP3107ZMTR-G1?

The BNO pin sets the brownout protection threshold via an external resistor divider connected between HV and GND. With R = 0 kΩ (shorted), it activates at 99 V DC input; increasing resistance lowers the turn-on voltage down to 92 V. This prevents erratic operation during low-line AC conditions and ensures clean startup.

Can AP3107ZMTR-G1 operate without an auxiliary winding?

Yes - its integrated HV pin draws start-up current directly from the bulk capacitor, eliminating the need for an auxiliary winding or external high-voltage resistor. Once VCC reaches 16 V, the HV path disables automatically, reducing standby losses and simplifying transformer design.

How does the green mode function reduce audible noise?

Green mode reduces switching frequency linearly under light load but maintains a minimum of 28 kHz - above the human hearing range (20 kHz). This avoids mechanical vibration in transformers and inductors while preserving regulation accuracy and minimizing no-load power consumption.

What protection features are implemented internally in AP3107ZMTR-G1?

AP3107ZMTR-G1 integrates cycle-by-cycle OCP (via SENSE), VCC overvoltage protection (30 V clamp), overtemperature shutdown (140 °C), constant overload protection (COLP), short-circuit protection (SCP), and brownout protection. All feature built-in filtering (e.g., 4 ms OLP delay, 25 μs OCP filter) to prevent false triggering.