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Overview
| Topology | Buck Converter |
| Input voltage | 120 V |
| Output 1 | 65 V / 20 A |
| IC revision | 1.0 |
Description
The ACT43950 is a constant-current capacitor charger. The ACT43850 is a high-voltage and high-power buck regulator. The ACT43750 controls a drain switch and provides a negative voltage for an RF PA device. This three-chip combination forms a compact, complete power supply system for radio frequency (RF) power amplifiers (PAs) that demand fast transient, high-current, pulsed loads. The three-chip combination can be evaluated with one, two, or three ICs on an EVK. These EVKs are referred to as Combo Boards or CB. This document describes the characteristics and operation of Qorvo’s three-chip ACT43950/43850/43750 Combo Board. It also describes how to use the Combo Board when it is separated into smaller boards. It provides setup and operation instructions, schematic, layout, BOM, GUI, and test data. Refer to the section of this document that matches the EVK you are testing.ACT43X50PCKCB1: This Combo Board contains the ACT43750, ACT43850, and ACT43950 ICs.ACT43X950PCKCB1: This Combo Board contains ACT43950 ICs.ACT43850PCKCB1: This Combo Board contains the ACT43750 and ACT43850 ICs.
Features
The first stage ACT43950 accepts a DC input voltage up to 400V and converts it into a regulated DC constant current to charge bulkcapacitors. The second stage ACT43850 takes up to 150V DC input to generate programmable output voltage from 20V to 65V at up to20A. The last stage is the ACT43750 which has two main functions. The first is to provide proper turn on sequencing for RFPAs. Thesecond is to control pulsed drain voltage switching for the RFPA.Qorvo recommends that the user connect EVK to a PC and use the graphical user interface (GUI) software. The GUI allows the user toenable/disable devices and program the exact voltage and current for the specific RF PA being tested. AC43950 does not haveregisters but can be enabled/disabled by a GPIO from the Dongle when using the ACT43850 GUI. The ACT43850 GUI gives the userfull control over the drain voltage, protection features, and gate voltage. The user can use the ACT43750 GUI to set the Idq bias currentrequirement, and the design autonomously finds and stores the optimal gate voltage for the Idq bias current. After the optimal gate biasvoltage is found, the user can then apply an RF signal to test the RF PA functionality.
Typical applications
- RF GaN / GaAs PA Power Supply
- Light Beacons
- Civilian Radar System
- Laser Drivers
- Military Radar System
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Wire Type | f | Mount | Center Contact | Operating Temperature | Pins | Type | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 10 µH, 59.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance10 µH | Performance Rated Current59.2 A | Saturation Current @ 10%22.9 A | Saturation Current @ 30%25.1 A | DC Resistance0.97 mΩ | Self Resonant Frequency15 MHz | Wire TypeFlat | – | MountSMT | – | Operating Temperature -40 °C up to +125 °C | – | – | Length27 mm | Height18.5 mm | Rated Current59.2 A | – | ||||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | – | – | – | – | MountTHT | – | Operating Temperature -40 °C up to +105 °C | Pins2 | TypeStraight | Length5.08 mm | – | Rated Current3 A | Working Voltage250 V (AC) | |||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | – | – | – | – | MountTHT | – | Operating Temperature -40 °C up to +105 °C | Pins4 | TypeStraight | Length10.16 mm | – | Rated Current3 A | Working Voltage250 V (AC) | |||
 | WR-MMCX PCB THT/SMT, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-MMCX PCB THT/SMT | – | – | – | – | – | – | – | Frequency RangeDC~6 GHz | MountSMT | Center ContactØ 0.7 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Working Voltage170 V (AC) |