Analog Devices Inc. ADP1071-2ACCZ-R7

Overview

ADP1071-2ACCZ-R7 from Analog Devices is a current-mode isolated synchronous flyback controller with integrated iCoupler® isolation, 5 kVRMS dielectric rating in SOIC_W package, forced CCM operation, primary-side VIN up to 60 V, and programmable switching frequency from 50 kHz to 600 kHz - designed for high-efficiency telecom and industrial isolated DC/DC power supplies.

For engineers reviewing the ADP1071-2ACCZ-R7 datasheet, ADP1071-2ACCZ-R7 pinout, ADP1071-2ACCZ-R7 application, or ADP1071-2ACCZ-R7 equivalent, key selection criteria include its reinforced 5 kVRMS isolation, dual 1 A MOSFET drivers (primary and secondary), precision enable with 1.2 V threshold and hysteresis, and integrated error amplifier with ±0.85% feedback accuracy over −40°C to +85°C.

Technical Context

The ADP1071-2ACCZ-R7 implements fixed-frequency current-mode PWM control with slope compensation and cycle-by-cycle input overcurrent protection. Its integrated iCoupler replaces optocouplers and signal transformers, enabling galvanic isolation of feedback and gate drive signals across the barrier without external components.

It features separate primary-side (VIN) and secondary-side (VDD2) supply rails, independent UVLO thresholds (VIN rising = 4.7 V, VDD2 rising = 3.55 V), and synchronized soft-start timing controlled by an external resistor on the GATE pin. The device enforces 84% maximum duty cycle and supports frequency synchronization via the SYNC pin (100–600 kHz range).

Key Specifications

Pinout & Package

ADP1071-2ACCZ-R7 is housed in a 16-lead wide-body SOIC (RW-16) package with creepage/clearance ≥7.6 mm and internal isolation gap ≥0.030 mm. The package supports 5 kVRMS rated dielectric isolation and complies with UL 1577, VDE V 0884-10, and GB4943.1-2011 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28911DR and LT3999EMSE#TRPBF, ADP1071-2ACCZ-R7 uniquely integrates iCoupler isolation, dual 1 A gate drivers, and forced CCM operation - delivering lower component count, higher efficiency, and simplified certification for 5 kVRMS isolated flyback designs.

Availability

ADP1071-2ACCZ-R7 is available at Aetrix Electronics and suitable for telecom power supplies, industrial isolated DC/DC converters, and medical auxiliary power systems requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for ADP1071-2ACCZ-R7 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.

The ADP1071 product line delivers fully integrated isolated power controllers targeting high-density, safety-certified DC/DC conversion - emphasizing reduced system complexity, improved reliability, and accelerated time-to-market for isolated power designs.

FAQ

What is the isolation voltage rating of the ADP1071-2ACCZ-R7?

The ADP1071-2ACCZ-R7 features a 5 kVRMS rated dielectric isolation voltage (1 minute test) in its 16-lead SOIC_W package, certified to UL 1577, VDE V 0884-10, and GB4943.1-2011 standards. This reinforced insulation supports up to 849 VPEAK working voltage per IEC 60950-1 and 238 VRMS for 2 MOPP in medical applications. The isolation is implemented using Analog Devices' patented iCoupler technology, eliminating external optocouplers.

Does the ADP1071-2ACCZ-R7 support synchronous rectification on the secondary side?

Yes, the ADP1071-2ACCZ-R7 integrates a dedicated 1 A synchronous rectifier (SR) driver on the secondary side (pin 15, SR), with 5 V output, 13 ns rise time, and programmable dead time (52 ns from GATE falling to SR rising). It works in conjunction with the primary-side GATE driver (pin 1) and internal iCoupler to coordinate timing across the isolation barrier - enabling high-efficiency flyback operation without external SR controllers.

What is the maximum input voltage supported by the ADP1071-2ACCZ-R7?

The ADP1071-2ACCZ-R7 supports a primary-side input voltage (VIN) range of 4.7 V to 60 V, with absolute maximum rating of 66 V. This is specific to the ADP1071-2 variant (ADP1071-1 uses VREG1 instead of VIN). The device includes precision UVLO with 4.7 V turn-on and 4.0 V turn-off thresholds plus 0.19 V hysteresis, ensuring reliable start-up and brownout protection in 24 V and 48 V telecom and industrial systems.

How does the ADP1071-2ACCZ-R7 implement output voltage regulation?

The ADP1071-2ACCZ-R7 achieves output regulation by sensing the secondary-side voltage via the FB pin, comparing it to an internal 1.2 V reference with ±0.85% accuracy. The error signal is processed by an integrated transconductance amplifier (250 µS typical), and the resulting COMP signal is transmitted across the iCoupler to modulate the primary-side GATE duty cycle. This closed-loop architecture maintains tight regulation without external op-amps or optocouplers.

Can the ADP1071-2ACCZ-R7 be synchronized to an external clock?

Yes, the ADP1071-2ACCZ-R7 supports frequency synchronization via the SYNC pin (pin 8), which accepts external clock signals from 100 kHz to 600 kHz. The device locks its internal oscillator to the external source within 7 cycles and maintains phase alignment. This capability enables EMI reduction through spread-spectrum techniques or multi-phase interleaving in systems with multiple ADP1071-2ACCZ-R7 controllers.