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CS52845ED8 PDF预览

CS52845ED8

更新时间: 2024-09-28 22:18:03
品牌 Logo 应用领域
樱桃 - CHERRY 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
页数 文件大小 规格书
6页 145K
描述
Current Mode PWM Control Circuit with 50% Max Duty Cycle

CS52845ED8 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:0.150 INCH, SO-8Reach Compliance Code:unknown
风险等级:5.83Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:25 V
最小输入电压:12 V标称输入电压:15 V
JESD-30 代码:R-PDSO-G8JESD-609代码:e0
功能数量:1端子数量:8
最高工作温度:85 °C最低工作温度:-40 °C
最大输出电流:1 A封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:SOP8,.25
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
认证状态:Not Qualified子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BUCK
最大切换频率:500 kHz技术:BIPOLAR
温度等级:INDUSTRIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUALBase Number Matches:1

CS52845ED8 数据手册

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CS52845  
Current Mode PWM  
Control Circuit  
with 50% Max Duty Cycle  
Description  
Features  
Optimized for Off-line  
The CS52845 provides all the nec-  
An undervoltage lockout ensures  
that VREF is stabilized before the  
output stage is enabled. In the  
CS52845 turn on is at 8.4V and  
turn off at 7.6V.  
Control  
essary features to implement off-  
line fixed frequency current-mode  
control with a minimum number  
of external components.  
Temperature  
Compensated Oscillator  
50% Maximum Duty-cycle  
Clamp  
The CS52845 incorporates a new  
precision temperature-controlled  
oscillator to minimize variations in  
frequency. An internal toggle flip-  
flop, which blanks the output  
every other clock cycle, limits the  
duty-cycle range to less than 50%.  
Other features include low start-up  
current, pulse-by-pulse current lim-  
iting, and a high-current totem pole  
output for driving capacitive loads,  
such as gate of a power MOSFET.  
The output is low in the off state,  
consistent with N-channel devices.  
V  
Stabilized before  
REF  
Output Stage is Enabled  
Low Start-up Current  
Pulse-by-pulse Current  
Limiting  
Improved Undervoltage  
Absolute Maximum Ratings  
Lockout  
Double Pulse Suppression  
Supply Voltage (ICC<30mA)..........................................................Self Limiting  
Supply Voltage (Low Impedance Source)...................................................30V  
Output Current...............................................................................................±1A  
Output Energy (Capacitive Load) .................................................................5µJ  
Analog Inputs (VFB, VSENSE)...........................................................-0.3V to 5.5V  
Error Amp Output Sink Current...............................................................10mA  
Lead Temperature Soldering  
1% Trimmed Bandgap  
Reference  
High Current Totem Pole  
Output  
Package Options  
Reflow (SMD styles only)...........60 sec. max above 183°C, 230°C peak  
8L SO Narrow  
Block Diagram  
VREF  
COMP  
VFB  
8
7
6
5
1
V
CC Undervoltage Lock-out  
VCC  
2
VCC  
VCC Pwr  
VOUT  
Gnd  
Sense  
OSC  
3
4
34V  
Set/  
5.0 Volt  
VREF  
Reset Reference  
Gnd  
VFB  
8.4V/7.6V  
Internal  
Bias  
14L SO Narrow  
Error  
Amplifier  
1
2
3
4
5
6
7
14  
13  
12  
COMP  
NC  
VREF  
NC  
VREF  
Undervoltage  
Lockout  
-
R
R
COMP  
+
2.50V  
VFB  
VCC  
Toggle  
VOUT  
NOR  
OSC  
Flip-Flop  
Oscillator  
11 VCC Pwr  
NC  
S
R
10  
Sense  
NC  
VOUT  
2 R  
Pwr Gnd  
9
8
Gnd  
R
1V  
PWM  
Latch  
Current  
Sensing  
Pwr Gnd  
OSC  
Sense  
Comparator  
Cherry Semiconductor Corporation  
2000 South County Trail, East Greenwich, RI 02818  
Tel: (401)885-3600 Fax: (401)885-5786  
Email: info@cherry-semi.com  
Web Site: www.cherry-semi.com  
Rev. 3/4/99  
A
Company  
®
1

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