Design contains obsolete parts

ADP1850DP-EVALZ: 1.09V @ 50A, 10 ~ 15V in

Summary

This document describes the design, operation, and test results of the ADP1850DP-EVALZ operating in dual-phase mode. The input range for this evaluation board is 10 V to 15 V, and the regulated output voltage is 1.09 V with a maximum 50 A output current. A switching frequency (fSW) of 300 kHz is chosen to achieve a good balance between efficiency and the sizes of the power components.

The ADP1850 is a dual-channel, step-down switching controller with integrated drivers for external N-channel synchronous power MOSFETs. The two PWM outputs are phase shifted 180°, which reduces the input RMS ripple current, thus minimizing required input capacitance. The two outputs can be combined for dual-phase PWM operation that can deliver more than 50 A output current. The internal parameters of the two channels are optimized for current sharing.

In addition, boost diodes are integrated into the ADP1850, thus lowering the overall system cost and component count. The ADP1850 can be set to operate in pulse skip, high efficiency mode under light load or in PWM continuous conduction mode.

The ADP1850 includes externally adjustable soft start, output overvoltage protection, externally adjustable current limit, power good, tracking function, and a programmable oscillator frequency that ranges from 200 kHz to 1.5 MHz. The ADP1850 provides an output voltage accuracy of ±0.85% from −40°C to +85°C and ±1.5% from −40°C to +125°C junction temperature.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	ADP1850DP-EVALZ-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.09 V
Current Out	50 A
Voltage In	10 ~ 15 V
Efficiency @ Conditions	>85%, 12V in, 1.09V @ 5 ~ 50 A
Voltage Out Range	0.6 ~ 90% Vin
Features	Current Limit (Adj. or Fixed) Current Sharing Over Current Protection Over Voltage Protection Power Good Output Power Save Mode Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Under Voltage Protection, Brown-Out Voltage Tracking
Switching Frequency	300 kHz
Standby Current [Typical]	100 µA
Quiescent Current [Typical]	4.5 mA
Component Count + Extras	59 + 12
Internal Switch	No
Design Author	Analog Devices
Application / Target Market	Medical Point of Load (PoL) Power: Industrial Power Telecom
Standby Current [Maximum]	200 µA
Quiescent Current [Maximum]	5.8 mA
Main I.C. Base Part	ADP1850
Date Created By Author	2011-08
Date Added To Library	2013-10