欢迎访问ic37.com |
会员登录 免费注册
发布采购

CS5156GD16 参数 Datasheet PDF下载

CS5156GD16图片预览
型号: CS5156GD16
PDF下载: 下载PDF文件 查看货源
内容描述: CPU 5位非同步降压控制器 [CPU 5-Bit Nonsynchronous Buck Controller]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 14 页 / 310 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
 浏览型号CS5156GD16的Datasheet PDF文件第3页浏览型号CS5156GD16的Datasheet PDF文件第4页浏览型号CS5156GD16的Datasheet PDF文件第5页浏览型号CS5156GD16的Datasheet PDF文件第6页浏览型号CS5156GD16的Datasheet PDF文件第8页浏览型号CS5156GD16的Datasheet PDF文件第9页浏览型号CS5156GD16的Datasheet PDF文件第10页浏览型号CS5156GD16的Datasheet PDF文件第11页  
Applications Information: continued  
When regulator output voltage achieves the 1V level pre-  
sent at the COMP pin, regulation has been achieved and  
normal off time will ensue. The PWM comparator termi-  
nates the switch2on time, with off time set by the COFF  
capacitor. The V  
control loop will adjust switch duty  
cycle as required to ensure the regulator output voltage  
tracks the output of the error amplifier.  
The soft start and COMP capacitors will charge to their  
final levels, providing a controlled turn on of the regulator  
output. Regulator turn on time is determined by the COMP  
capacitor charging to its final value. Its voltage is limited  
by the soft start COMP clamp and the voltage on the soft  
start pin (see Figures 2 and 3).  
Trace 1 - Regulator Output Voltage (5V/div.)  
Trace 2 - Inductor Switching Node (5V/div.)  
Figure 4: CS5156 demonstration board enable startup waveforms.  
Normal Operation  
During normal operation, switch off time is constant and  
set by the COFF capacitor. Switch on time is adjusted by the  
2
V
control loop to maintain regulation. This results in  
changes in regulator switching frequency, duty cycle, and  
output ripple in response to changes in load and line.  
Output voltage ripple will be determined by inductor rip-  
ple current working into the ESR of the output capacitors  
(see Figures 5 and 6).  
Trace 1 - Regulator Output Voltage (1V/div.)  
Trace 2 - Inductor Switching Node (2V/div.)  
Trace 3 - 12V input (V  
and V ) (5V/div.)  
CC2  
CC1  
Trace 4 - 5V Input (1V/div.)  
Figure 2: CS5156 demonstration board startup in response to increasing  
12V and 5V input voltages. Extended off time is followed by normal off  
time operation when output voltage achieves regulation to the error  
amplifier output.  
Trace 1 - Regulator Output Voltage (10V/div.)  
Trace 2 - Inductor Switching Node (5V/div.)  
Figure 5: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 0.5A (light load).  
Trace 1 - Regulator Output Voltage (1V/div.)  
Trace 3 - COMP Pin (error amplifier output) (1V/div.)  
Trace 4 - Soft Start Pin (2V/div.)  
Figure 3: CS5156 demonstration board startup waveforms.  
If the input voltage rises quickly, or the regulator output is  
enabled externally, output voltage will increase to the level  
set by the error amplifier output more rapidly, usually  
within a couple of cycles (see Figure 4).  
7
 复制成功!