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UC2578_16

更新时间: 2024-11-07 02:58:51
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
7页 135K
描述
Buck Pulse Width Modulator Stepdown Voltage Regulator

UC2578_16 数据手册

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application  
INFO  
UC2578  
UC3578  
available  
Buck Pulse Width Modulator Stepdown Voltage Regulator  
FEATURES  
DESCRIPTION  
Provides Simple Single Inductor Buck The UC3578 is a PWM controller with an integrated high side floating gate  
PWM Step-Down Voltage Regulation  
driver. It is used in buck step down converters and regulates a positive  
output voltage. Intended to be used in a distributed power system, the IC  
allows operation from 14V to 72V input voltage which range includes the  
prevalent telecomm bus voltages. The output duty cycle of the UC3578  
can vary between 0% and 90% for operation over the wide input voltage  
and load conditions.  
Drives External High Side NMOS  
Switch  
14V to 72V Input Voltage Operating  
Range  
Contains 100kHz Internal Oscillator,  
2V Reference and UVLO  
The UC3578 simplifies the design of the single switch PWM buck converter  
by incorporating a floating high side driver for an external N-channel  
MOSFET switch. It also features a 100kHz fixed frequency oscillator, an  
internal 2V precision reference, an error amplifier configured for voltage  
mode operation, and a PWM comparator with latching logic. Comple-  
menting the traditional voltage mode control block, the UC3578 incorpo-  
rates an overcurrent shutdown circuit with full cycle soft re-start to limit the  
input current to a user defined maximum value during overload operation.  
Additional functions include an under voltage lockout circuit to insure that  
sufficient input supply voltage is present before any switching activity can  
occur.  
Soft Start on Power Up  
Overcurrent Shutdown Followed by  
Soft Start  
The UC2578 and the UC3578 are both available in surface mount and  
thru-hole power packages.  
ORDERING INFORMATION  
TEMPERATURE RANGE  
PACKAGE  
Power SOIC  
Power PDIP  
Power SOIC  
Power PDIP  
UC2578DP  
UC2578N  
UC3578DP  
UC3578N  
–40°C to +85°C  
0°C to +70°C  
TYPICAL APPLICATION DIAGRAM  
R
L
SENSE  
0.12  
OUT  
15-40 V  
V
IN  
OUT  
IRFZ34  
40µH  
C
S
R
1k  
S
C
220µF  
1µF  
1000pF  
OUT  
RECTIFIER  
MBR 3100  
15  
C
GG  
1µF  
47µF  
1N4148  
5k  
11  
DIODE CS  
14 VCC  
15  
10  
7
6
10  
C
VGG OUT  
SRC  
EAINV  
2
50k  
R1  
220pF  
CC  
UC3578  
1µF  
2200pF  
100k  
16 SS  
GND GND GND GND  
EAOUT  
3
1k  
4
5
12  
13  
C
SS  
UDG-99064  
05/99  

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