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UCC1570 PDF预览

UCC1570

更新时间: 2024-11-25 22:17:51
品牌 Logo 应用领域
德州仪器 - TI 脉冲
页数 文件大小 规格书
9页 342K
描述
Low Power Pulse Width Modulator

UCC1570 数据手册

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UCC1570  
UCC2570  
UCC3570  
Low Power Pulse Width Modulator  
FEATURES  
DESCRIPTION  
Low Power BiCMOS Process  
The UCC1570 family of pulse width modulators is intended for application  
in isolated switching supplies using primary side control and a voltage  
mode feedback loop. Made with a BiCMOS process, these devices feature  
low startup current for efficient off-line starting with a bootstrapped low volt-  
age supply. Operating current is also very low; yet these devices maintain  
the ability to drive a power MOSFET gate at frequencies above 500kHz.  
85µA Start-up Current  
1mA Run Current  
1A Peak Gate Drive Output  
Voltage Feed Forward  
Programmable Duty Cycle Clamp  
Optocoupler Interface  
500kHz Operation  
Voltage feedforward provides fast and accurate response to wide line volt-  
age variation without the noise sensitivity of current mode control. Fast cur-  
rent limiting is included with the ability to latch off after a programmable  
number of repetitive faults has occurred. This allows the power supply to  
ride through a temporary overload, while still shutting down in the event of  
a permanent fault. Additional versatility is provided with a maximum duty  
cycle clamp programmable within a 20% to 80% range and line voltage  
sensing with a programmable window of allowable operation.  
Soft Start  
Fault Counting Shutdown  
Fault Latch Off or Automatic Restart  
BLOCK DIAGRAM  
CLK  
CLOCK  
GENERATOR  
11  
FREQ  
4.5V  
RAMP  
VALLEY  
1V  
6
7
VFWD  
SLOPE  
RAMP  
10 I3  
12 VREF  
5V  
GENERATOR  
GND  
13  
S
I3  
RAMP  
LATCH  
10  
1V  
R
15V  
10 I4  
13/9V  
ISET  
9
I4  
RAMP  
PEAK  
HIGH  
LINE  
3
4V  
1V  
VCC  
4V  
LOW  
LINE  
OUT  
4
5
S
8
FEEDBK  
SOFTST  
RD  
I4  
PWM  
LATCH  
PGND  
PWM  
14  
CURRENT  
LIMIT  
CURLIM  
2
I4  
0.2V  
SD  
R
R
CLK  
SD  
COUNT  
1
SHUTDOWN  
LATCH  
4V  
SHUTDOWN  
0.6V  
04/99  

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