開關型降壓結構穩壓IC HY2596A

HY2596A  of  regulators  provides  all  the  active functions  for  a  step-down  (buck)  switching regulator,  and  drives  3A  load with  excellent  line and  load  regulation.  HY2596A  is  available  in fixed  output  voltages  of  5V  and  an  adjustable output version.

Regulators  are  simple  to  use  and  require  a minimum  number  of  external  components. Features include internal frequency compensation and a fixed-frequency oscillator.

The  HY2596A  is  high-efficiency  replacements for  popular  three-terminal  linear  regulators,  and requiring  a  smaller  heat-sink  or  even  no heat-sink. HY2596A performs well with standard  inductors from  several  manufacturers  and  simplifying  the design of switch mode power supplies. HY2596A guarantees 4% tolerance on output voltage within specified  input  voltages  and  output  load conditions and 15% on the oscillator frequency. External  shut-down  is  included  with  typical 100uA  (typical)  standby  current.  The  output switch has cycle-by-cycle current limiting as well as  thermal  shut-down  for  full  protection  under fault conditions

HY2596A  operates  at  a  switching  frequency  of 150  kHz  thus  allowing  smaller  size  filter components  than  what  would  be  needed  with lower  frequency  switching  regulators.  Available in  a  5-lead  TO-263  surface  mount  package  and power SOIC-8L package.

Features

5V, and adjustable output versions 

Adjustable version output voltage range, 1.2V to 37V with ±4% max over line and load conditions 

3A output load current 

Input voltage range up to 40V 

Requires only 4 external components 

150 kHz fixed frequency internal oscillator 

TTL shutdown capability 

Low power standby mode, typically 100 uA. 

High efficiency 

Uses readily available standard inductors 

Thermal shutdown and current limit protection

Applications

Simple high-efficiency step-down (buck) regulator

Pre-regulator for linear regulators.

On-card/boards witching regulators

Positive to negative converter

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