- 您现在的位置：买卖IC网 > PDF目录15056 > CS51033GD8 (ON Semiconductor)IC REG CTRLR BUCK PWM 8-SOIC PDF资料下载
参数资料
| 型号： | CS51033GD8 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 8-SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 Product Obsolescence 30/Dec/2003 |
| 标准包装： | 98 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 83.3% |
| 电源电压： | 3 V ~ 16 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
CS51033
Buck Regulator Operation
A block diagram of a typical buck regulator is shown in
Figure 4. If we assume that the output transistor is initially
off, and the system is in discontinuous operation, the
inductor current I L is zero and the output voltage is at its
nominal value. The current drawn by the load is supplied by
the output capacitor C O . When the voltage across C O drops
below the threshold established by the feedback resistors R1
and R2 and the reference voltage V REF , the power transistor
Q1 switches on and current flows through the inductor to the
output. The inductor current rises at a rate determined by
(V IN ? V OUT )/Load. The duty cycle (or “on” time) for the
CS51033 is limited to 80%. If output voltage remains higher
than nominal during the entire C OSC change time, the Q1
does not turn on, skipping the pulse.
V IN
C IN
Q 1
L
R 1
D 1
C O
R LOAD
R 2
Control
Feedback
Figure 4. Buck Regulator Block Diagram
Charge Pump Circuit
(Refer to the CS51033 Application Diagram on page 2).
An external charge pump circuit is necessary when the V C
input voltage is below 5.0 V to ensure that there is suffifient
gate drive voltage for the external FET. When V IN is applied,
capacitors C1 and C2 will be charged to a diodes drop below
FET turns on, it’s drain voltage will be approximately equal
to V IN . Since the voltage across C1 can not change
instantaneously, D2 is reverse biased and the anode voltage
rises to approximately 2.0 × 3.3 V ? VD2. C1 transfers some
of its stored charge C2 via D3. After several cycles there is
sufficient gate drive voltage.
V IN via diodes D2 and D4, respectively. When the P?Ch
http://onsemi.com
6
相关PDF资料 |
PDF描述 |
|---|---|
| DS1815R-20+T&R | IC ECONORST 3.3V P-P 20% SOT23-3 |
| VE-20M-EY-F2 | CONVERTER MOD DC/DC 10V 50W |
| RCM25DTKI-S288 | CONN EDGECARD 50POS .156 EXTEND |
| VE-20M-EY-F1 | CONVERTER MOD DC/DC 10V 50W |
| B41043A6108M | 1000UF 50V 16X31.5 SINGLE END |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS51033GD8G | 功能描述:DC/DC 开关控制器 Fast PFET Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS51033GDR8 | 功能描述:DC/DC 开关控制器 Fast PFET Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS51033GDR8G | 功能描述:DC/DC 开关控制器 Fast PFET Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS51033GN8 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
| CS-51033N8 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
发布紧急采购，3分钟左右您将得到回复。