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CS3845BGD14 PDF预览

CS3845BGD14

更新时间: 2024-09-18 22:48:55
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 152K
描述
Current Mode PWM Control Circuit with 50% Max Duty Cycle

CS3845BGD14 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-14Reach Compliance Code:unknown
风险等级:5.78Is 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-G14JESD-609代码:e0
功能数量:1端子数量:14
最高工作温度:70 °C最低工作温度:
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:SOP14,.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:COMMERCIAL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

CS3845BGD14 数据手册

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CS3845B  
Current Mode PWM  
Control Circuit  
with 50% Max Duty Cycle  
Description  
Features  
Optimized for Off-line Use  
Temperature  
Compensated Oscillator  
The CS3845B provides all the neces-  
exceeds 50%. The undervoltage lock-  
out feature ensures that V is stabi-  
sary features to implement off-line  
fixed frequency current-mode control  
with a minimum number of external  
components.  
REF  
lized within specification before the  
output stage is enabled. The CS3845B  
has been optimized for lower start up  
current (500µA max).  
50% Maximum Duty-cycle  
Clamp  
The CS3845B incorporates a precision  
temperature-controlled oscillator to  
minimize variations in frequency. An  
internal toggle flip-flop, which blanks  
the output off every other clock cycle,  
ensures that the duty-cycle never  
Other features include 1% trimmed  
band gap reference, pulse-by-pulse  
current limiting, and a high-current  
totem pole output for driving capaci-  
tive loads.  
Low Start-up Current  
(500µA max)  
Pulse-by-pulse Current  
Limiting  
Undervoltage Active Pull  
Down  
Absolute Maximum Ratings  
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  
Wave Solder (through hole styles only)..........10 sec. max, 260°C peak  
Reflow (SMD styles only)...........60 sec. max above 183°C, 230°C peak  
Package Options  
Block Diagram  
8 Lead PDIP & SO  
1
2
3
4
8
7
6
5
COMP  
VFB  
VREF  
VCC  
VCC Undervoltage Lock-out  
VCC  
VCC Pwr  
34V  
Sense  
OSC  
VOUT  
Gnd  
Set/  
5.0 Volt  
VREF  
Reset Reference  
Gnd  
VFB  
8.4V/7.6V  
Internal  
Bias  
Error  
14 Lead SO Narrow  
Amplifier  
VREF  
R
R
Undervoltage  
Lockout  
-
COMP  
1
2
3
4
5
6
7
14  
13  
12  
COMP  
VREF  
+
2.50V  
NC  
VFB  
NC  
Toggle  
Flip-Flop  
NOR  
VOUT  
OSC  
Oscillator  
VCC  
S
R
11 VCC Pwr  
NC  
2 R  
Pwr Gnd  
10  
9
Sense  
NC  
VOUT  
R
1V  
PWM  
Latch  
Current  
Sensing  
Comparator  
Gnd  
Sense  
8
OSC  
Pwr Gnd  
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. 11/19/98  
A
®
Company  
1

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