CXCH7601是150KHz固定频率的脉冲宽度调制（降压）DC/DC转换器，能够高效、低功耗地驱动2A负载纹波和良好的线路和负载调节。最低要求外部元件数量多，调节器使用简单包括内部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%。一个使能功能，一个过电流保护功能内置。内置内部补偿块以最小化外部组件数一数。
宽4.5V至40V输入电压范围
输出可从1.235V调整到37V
最小压降1.5V
固定150kHz开关频率
2A恒定输出电流能力
内优化功率晶体管
优良的线路和负载调节
TTL关闭能力
带滞后功能的开/关引脚
带输出恒流回路
内置热关机功能
内置限流功能
内置输出过电压保护
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[ CXCH7601 ]"
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 CXCH7601 is a 150KHz fixed frequency PWM buck (step-down)
DC/DC converter,capable of driving a 2A 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.
An internal compensation block is built in to minimize external component
count.
二.产品特点(Features)
Wide 4.5V to 40V Input Voltage Range
Output Adjustable from 1.235V to 37V
Minimum Drop Out 1.5V
Fixed 150kHz Switching Frequency
2A Constant Output Current Capability
Internal Optimize Power Transistor
Excellent line and load regulation
TTL shutdown capability
ON/OFF pin with hysteresis function
With output constant current loop
Built in thermal shutdown function
Built in current limit function
Built in output over voltage protection
SOP8-EP (Exposed PAD) package
三,应用范围 (Applications)
Car Charger
Battery Charger
LED Constant Current Driver
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 |
|
1,2 |
SW |
Power Switch Output Pin (SW). Output is the switch node that |
|
3 |
GND |
Ground Pin.(Note: Connected the back exposed PAD to Pin3.) |
|
4 |
FB |
Feedback Pin (FB). Through an external resistor divider |
|
5 |
CS |
Output Current Sense Pin; (Iload=0.155V/Rcs) |
|
6 |
EN |
Enable Pin. Drive EN pin low to turn on the device, drive it high |
|
7,8 |
VIN |
Supply Voltage Input Pin. CXCH7601 operates from a 4.5V to 40V |
六.电路原理图
七,功能概述
|
Parameter |
Symbol |
Value |
Unit |
|
Input Voltage |
Vin |
-0.3 to 45 |
V |
|
FB Pin Voltage |
VFB |
-0.3 to Vin |
V |
|
EN Pin Voltage |
VEN |
-0.3 to Vin |
V |
|
SW Pin Voltage |
VSW |
-0.3 to Vin |
V |
|
Power Dissipation |
PD |
Internally limited |
mW |
|
Thermal Resistance |
RJA |
60 |
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
|
自带恒压恒流环路的降压型单片车充专用芯片 |
||||||
|
产品型号 |
输入电压 |
开关电流 |
开关频率 |
恒压设置 |
恒流设置 |
封装类型 |
|
4.5V ~ 40V |
2A |
150KHz |
Adj (1.235V) |
0.155V |
SOP8L-EP |
|
|
4.5V ~ 40V |
3A |
150KHz |
Adj (1.235V) |
0.155V |
TO263-5L |
|
|
8V ~ 40V |
3A |
150KHz |
Adj (1.25V) |
0.11V |
SOP8L-EP |
|
|
8V ~ 40V |
3A |
180KHz |
Adj (1.25V) |
0.11V |
SOP8L-EP |
|
|
8V ~ 36V |
5A |
150KHz |
Adj (1.25V) |
0.11V |
TO263-5L |
|
|
8V ~ 36V |
3A |
180KHz |
Adj (1.25V) |
RCS设置 |
SOP8L |
|
