特性 Features

? Wide-Input Voltage Range:

18 V to 60 V

? 20 A Total Output Current

? 90% Efficiency

? Wide-Adjust Output Voltage:

1.8 V to 3.6 V

? Over-Current Protection

? Output Over-Voltage Protection

? Over-Temperature Shutdown

? Output Enable Control

? Auto-Track Compatible

Sequenced Output

? Smart-Sense Remote Sensing

? Under-voltage Lockout

? Industry Standard Footprint

? Surface Mountable

? 1500 VDC Isolation

? Agency Approvals (Pending):

UL/cUL 60950, EN 60950

描述 Description

The PTB78520W is a 20-A rated,

wide-input (18-60 V) isolated DC/DC

converter that incorporates Auto-Track?

power-up sequencing. This allows these

modules to simultaneously power up with

any other downstream non-isolated, Auto-

Track compliant module.

The PTB78520W module provides

two outputs, each regulated to the same

voltage. During power up, the voltage at

‘VO Bus’ rises first, allowing this output

to provide input power to any downstream

non-isolated module. The voltage from

‘VO Seq’ is then allowed to rise simultaneously,

under the control of Auto-Track,

along with the outputs from the downstream

modules.

Whether used to facilitate power-up

sequencing, or operated as a stand-alone

module, the PTB78520W includes many

features expected of high-performance

DC/DC converter modules. The combi-

nation of input-output isolation and a

wide-input voltage range, allows operation

from either +24 V or –48 V. The wideoutput

adjust enables the output voltage

to be set to to any voltage over the range,

1.8 V to 3.6 V, using a single external

resistor. Precise output voltage regulation

is assured using Smart-Sense. This

is a differential remote sense that will

intelligently regulate the sequenced output,

depending on its sequence status.

Other operational features include an

input under-voltage lockout (UVLO) and

an output enable control. Over-current,

over-voltage, and over-temperature protection

assures the module’s ability to

survive any load fault.

Typical applications include distributed

power architectures in both telecom and

computing environments, particularly

complex digital systems requiring powersequencing

of multiple power supply rails.