CXSD6259是一个180 KHz固定频率的脉冲宽度调制（降压）
DC/DC转换器，能够以高效率、低纹波驱动4A负载
以及出色的线路和负载调节。需要最少数量的外部组件，调节器使用简单，包括内部高效
频率补偿和固定频率振荡器。
该pwm控制电路能够将占空比从0%线性调整到100%。
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目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（产品PDF文档）
5.产品封装图 6.电路原理图 7.功能概述 8.相关产品
一,产品概述(General Description) 
The CXSD6259 is a 180 KHz fixed frequency PWM buck (step-down)
DC/DC converter,capable of driving a 4A 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 internaln High efficiency
frequency compensation and a fixed-frequency oscillator.
The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%.
An over current protection function is built inside.When short protection function
happens, the operation frequency will be reduced from 180KHz to 48KHz. An internal compensation block is built in to minimize external component count.
二.产品特点(Features)
Wide 8V to 36V Input Voltage Range
Output Adjustable from 1.25V to 32V
Maximum Duty Cycle 100%
Minimum Drop Out 0.3V
Fixed 180KHz Switching Frequency
4A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency
Excellent line and load regulation
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in TO-252 package
三,应用范围 (Applications)
LCD Monitor and LCD TV
Portable instrument power supply
Telecom / Networking Equipment
四.技术规格书下载（产品PDF）
需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！
五,产品封装图 (Package)
|
Pin Number |
Pin Name |
Description |
|
1 |
GND |
Ground Pin. Care must be taken in layout. This pin should be |
|
2 |
FB |
Feedback Pin (FB). Through an external resistor divider |
|
3 |
SW |
Power Switch Output Pin (SW). SW is the switch node that |
|
4 |
VC |
Internal Voltage Regulator Bypass Capacity. In typical system |
|
5 |
VIN |
Supply Voltage Input Pin. CXSD6259 operates from a 8V to 36V |
六.电路原理图
七,功能概述
|
Parameter |
Symbol |
Value |
Unit |
|
Input Voltage |
Vin |
-0.3 to 40 |
V |
|
Feedback Pin Voltage |
VFB |
-0.3 to Vin |
V |
|
Output Switch Pin Voltage |
VOutput |
-0.3 to Vin |
V |
|
Power Dissipation |
PD |
Internally limited |
mW |
|
Thermal Resistance (TO252) |
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 |
八,相关芯片选择指南
|
降压型直流电源变换器芯片(大功率型) |
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|
产品型号 |
输入电压 |
开关电流 |
开关频率 |
电压版本 |
封装类型 |
|
5V ~ 32V |
4A |
300KHz |
Adj (0.8V) |
TO252-5L |
|
|
5V ~ 32V |
5A |
300KHz |
Adj (0.8V) |
TO263-5L |
|
|
8V ~ 36V |
4A |
180KHz |
Adj (1.25V) |
TO252-5L |
|
|
8V ~ 36V |
5A |
180KHz |
Adj (1.25V) |
TO263-5L |
|
|
8V ~ 40V |
8A |
180KHz |
Adj (1.25V) |
TO220-5L |
|
