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CYT2596

器件型号:CYT2596
器件类别:电源管理   
厂商:长运通(CYT)
厂商官网:http://www.cyt.com.cn/
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器件描述

单片DC/DC 变换控制电路

产品简介

功能特点

产品名称:单片DC/DC 变换控制电路


产品型号:CYT2596


产品描述:


The CYT2596 is a 150KHz fixed frequency


PWM buck (step-down) DC/DC converter,


capable of driving a 3A load with high


efficiency, low ripple and excellent line and


load regulation. Requiring a minimum


number of external components, the regulator


is simple to use and include internal


frequency compensation and a


fixed-frequency oscillator.


The PWM control circuit is able to adjust the


duty ratio linearly from 0 to 100%. An enable


function, an over current protection function


is built inside. When second current limit


function happens, the operation frequency


will be reduced from 150KHz to 50KHz. An


internal compensation block is built in to


minimize external component count.


参数:


Input Voltage Vin -0.3 to 45 V


Feedback Pin Voltage VFB -0.3 to Vin V


ON/OFF Pin Voltage VON/OFF -0.3 to Vin V


Output Switch Pin Voltage VOutput -0.3 to Vin V


Power Dissipation PD Internally limited mW


Thermal Resistance (TO263)


(Junction to Ambient, No Heatsink, Free Air) RJA 50 oC/W


Operating Junction Temperature TJ -40 to 125 oC


Storage Temperature TSTG -65 to 150 oC


Lead Temperature (Soldering, 10 sec) TLEAD 260 oC


ESD (HBM) 2000 V


封装:TO263-5L TO220-5L

CYT2596产品介绍

Datasheet
3A 150KHz 40V Buck DC/DC Converter
Features
Wide 4.5V to 40V Input Voltage Range
3.3V,5V,12V, and adjustable versions
Output Adjustable from 1.23V to 37V
Maximum Duty Cycle 100%
Minimum Drop Out 1.5V
CYT2596
General Description
The CYT2596 is a 150KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 3A load with high
efficiency, low ripple and excellent line and
load regulation. Requiring a minimum
number of external components, the regulator
is simple to use and include internal
frequency
compensation
and
a
fixed-frequency oscillator.
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
function, an over current protection function
is built inside. When second current limit
function happens, the operation frequency
will be reduced from 150KHz to 50KHz. An
internal compensation block is built in to
minimize external component count.
Fixed 150KHz Switching Frequency
3A Constant Output Current Capability
Internal Optimize Power Transistor
High e
fficiency
Excellent line and load regulation
TTL shutdown capability
ON/OFF pin with hysteresis function
Built in thermal shutdown function
Built in current limit function
Built in second current limit function
Available in TO-263 package
Applications
LCD Monitor and LCD TV
Digital Photo Frame
Set-up Box
ADSL Modem
Telecom / Networking Equipment
Figure1. Package Type of CYT2596
REV1.1
SHENZHEN CYT OPTO-ELECTRONIC TECHNOLOGY CO.,LTD
1
www.szcyt.com
Datasheet
3A 150KHz 40V Buck DC/DC Converter
Pin Configurations
CYT2596
Figure2. Pin Configuration of CYT2596 (Top View)
Table 1 Pin Description
Pin Number
1
2
3
Description
Supply Voltage Input Pin. CYT2596 operates from a 4.5V to
VIN
40V DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
Power Switch Output Pin (SW). Output is the switch node that
OUTPUT
supplies power to the output.
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor
GND
ground path to prevent switching current spikes from inducing
voltage noise into CYT2596.
Feedback Pin (FB). Through an external resistor divider
FEEDBACK network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.23V.
Enable Pin. Drive ON/OFF pin low to turn on the device, drive
ON/OFF
it high to turn it off. Floating is default low.
Pin Name
4
5
REV1.1
SHENZHEN CYT OPTO-ELECTRONIC TECHNOLOGY CO.,LTD
2
www.szcyt.com
Datasheet
3A 150KHz 40V Buck DC/DC Converter
Function Block
CYT2596
Figure3. Function Block Diagram of CYT2596
Typical Application Circuit
CYT2596-5.0
Figure4.CYT2596 Typical Application Circuit 12V-5V/3A
REV1.1
SHENZHEN CYT OPTO-ELECTRONIC TECHNOLOGY CO.,LTD
3
www.szcyt.com
Datasheet
3A 150KHz 40V Buck DC/DC Converter
Ordering Information
CYT2596
LF
CYT2596
LF: Lead Free
Circuit Type
Packing
Blank: Tube
TR:
Type and Reel
Package
S: TO263-5L
Version
ADJ: Adjust
3.3:
3.3V
5.0:
5V
Package
Temperature
Range
-40
o
C ~ 85
o
C
Part Number
Lead Free
CYT2596-ADJ
CYT2596-1.2
CYT2596-3.3
CYT2596-5.0
Marking ID
Lead Free
Packing Type
Tube
Tube
Tube
Tube
TO220-5L
REV1.1
SHENZHEN CYT OPTO-ELECTRONIC TECHNOLOGY CO.,LTD
4
www.szcyt.com
Datasheet
3A 150KHz 40V Buck DC/DC Converter
Absolute Maximum Ratings(Note1)
Parameter
Input Voltage
Feedback Pin Voltage
ON/OFF Pin Voltage
Output Switch Pin Voltage
Power Dissipation
Thermal Resistance (TO263)
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
Symbol
Vin
V
FB
V
ON/OFF
V
Output
P
D
R
JA
T
J
T
STG
T
LEAD
CYT2596
Value
-0.3 to 45
-0.3 to Vin
-0.3 to Vin
-0.3 to Vin
Internally limited
50
-40 to 125
-65 to 150
260
2000
Unit
V
V
V
V
mW
ºC/W
ºC
ºC
ºC
V
Note1:
Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
REV1.1
SHENZHEN CYT OPTO-ELECTRONIC TECHNOLOGY CO.,LTD
5
www.szcyt.com
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