Microchip Technology HV9120NG-G-M901

Overview

HV9120NG-G-M901 from Microchip Technology is a high-voltage, current-mode PWM controller IC designed for offline flyback and forward converter topologies. It operates from 10–450 V input, delivers ≤49% maximum duty cycle, supports ≤1 MHz oscillator frequency, draws <1.3 mA supply current, and integrates a 4.0 V bandgap reference - enabling compact, high-efficiency universal-input AC/DC power supplies.

For engineers reviewing the HV9120NG-G-M901 datasheet, HV9120NG-G-M901 pinout, HV9120NG-G-M901 application, or HV9120NG-G-M901 equivalent, key selection criteria include its 450 V HV regulator input capability, 49% duty limit for safe transformer reset, internal gate driver with 10 mA sink/source, and SOIC-16 package compatibility with high-density board layouts.

Technical Context

The HV9120NG-G-M901 implements a current-mode control architecture with dual comparators for independent modulation and overcurrent protection, eliminating clamping on the COMP pin to simplify compensation design. Its high-voltage regulator uses an internal depletion-mode DMOS transistor to derive VDD from VIN (10–450 V), shutting off at 7.8–9.4 V to minimize dissipation during normal operation.

It features a ring-oscillator-based timing circuit with external ROSC programming, where the HV9120 variant includes an internal frequency-dividing flip-flop to enforce 49% max duty - resulting in effective switching frequency half the oscillator frequency. Shutdown is managed via latched NSD/RST logic with nanosecond-level timing control (tSD ≤ 100 ns, tLW ≥ 25 ns).

Key Specifications

Pinout & Package

HV9120NG-G-M901 is housed in a 16-lead SOIC (Narrow Body) package: 9.90 × 3.90 mm body, 1.27 mm pitch, 1.75 mm max height, Pb-free/ROHS-compliant (e3 marking). Pin 1 is marked with a dot or bevel; pin numbering follows standard SOIC convention (counterclockwise from pin 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28632DR and ICE2QS03G, HV9120NG-G-M901 uniquely balances ultra-wide 10–450 V input support with discrete gate drive flexibility and unclamped COMP for precision loop tuning - making it optimal for custom high-density, universal-input SMPS where external MOSFET selection and thermal management are critical.

Availability

HV9120NG-G-M901 is available at Aetrix Electronics and suitable for offline high-frequency power supplies, universal input power supplies, and high density power supplies requiring stable component supply, long-term lifecycle assurance, and ROHS-compliant packaging.

Supply support for HV9120NG-G-M901 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

Microchip Technology Inc. is a global semiconductor company delivering microcontrollers, analog, FPGA, and mixed-signal solutions with emphasis on reliability, security, and longevity.

HV9120NG-G-M901 belongs to Microchip's high-voltage analog power controller product line, engineered specifically for cost-sensitive, high-efficiency offline SMPS designs where wide input range, precise current-mode control, and integrated HV startup reduce system complexity.

FAQ

What is the maximum input voltage rating for HV9120NG-G-M901?

HV9120NG-G-M901 has an absolute maximum input voltage rating of 450 V applied to the VIN pin. This allows direct connection to rectified 305 VAC or 400 VDC bus lines without external voltage dividers or clamping circuits. Operation within the recommended 10–450 V range ensures proper high-voltage regulator functionality and sustained gate drive performance across universal AC inputs.

Does HV9120NG-G-M901 support 100% duty cycle operation?

No, HV9120NG-G-M901 is the 49% maximum duty cycle variant of the HV9120/HV9123 family. Its internal architecture includes a frequency-dividing flip-flop that enforces this limit to guarantee safe transformer reset in flyback converters. For 99% duty cycle operation, the HV9123NG-G-M901 variant must be used instead - they are not pin-compatible replacements.

How is the oscillator frequency set on HV9120NG-G-M901?

The oscillator frequency of HV9120NG-G-M901 is set using a single external resistor (ROSC) between the OSCI and OSCO pins. With ROSC = 330 kΩ, the typical frequency is 100 kHz; reducing ROSC to 150 kΩ raises it to 200 kHz. The datasheet specifies 80–120 kHz at 330 kΩ and up to 3 MHz with ROSC = 0 Ω. Stray capacitance on the OSC pins must remain ≤5 pF for accuracy.

What is the purpose of the BIAS pin on HV9120NG-G-M901?

The BIAS pin on HV9120NG-G-M901 sets bias currents for internal analog blocks (error amplifier, reference, oscillator) via an external resistor to GND. At VDD = 10 V, a 390 kΩ resistor delivers the nominal 15–20 µA required. This resistor value scales linearly with VDD - e.g., 510 kΩ is recommended at 12 V - and does not require precision; ±5% tolerance is sufficient for full-spec operation.

Can HV9120NG-G-M901 operate without an external VDD supply?

Yes, HV9120NG-G-M901 can operate without an external VDD supply by leveraging its integrated high-voltage regulator. When VIN is applied (10–450 V), the internal depletion-mode DMOS transistor charges the VDD capacitor until VDD reaches ~9.4 V, at which point the HV path shuts off. A minimum 100× the driven MOSFET's gate charge (e.g., ≥100 nF for typical 1 nC FETs) is required on VDD–GND for reliable startup and hold-up.