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参数资料
| 型号： | IRU3033CSTR |
| 厂商： | International Rectifier |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC CTRL/REG PWM SWITCH 8-SOIC |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel Pentium?，II，P55C |
| 输入电压： | 12V |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
IRU3033(PbF)
For example, if Rt=1K and R B =422K, then the output
ripple is:
Frequency Calculation
The IRU3033 frequency of operation is calculated using
? Vo = (1/422) × 11 = 26mV
The advantage of fixed output ripple is that when the
output voltage changes from 2V to 3.5V, the ripple volt-
age remains the same which is important in meeting the
Intel maximum tolerance specification.
Switcher Output Voltage Setting
The output voltage of the switcher can be set using the
following equations:
the following formula:
Fs = [ (Vo × (1 - D) × ESR) ] / (L ×? Vo)
Where:
Vo = Output voltage (V)
D = Duty cycle
ESR = Output capacitor ESR (V)
L = Output inductance ( μ H)
? Vo = Output ripple voltage (V)
(MHz)
Assuming, Vo=3.38V and the selected output ripple is ≈
1.3%(44mV) of the output voltage, a set of equations
are derived that selects the resistor divider and the hys-
teresis resistor.
Assuming, Rt=1K ? , 1%:
R H = (11 × Rt) / ? V
For our example:
D ≈ (Vo + Vf) / V IN
Where:
Vf = Forward voltage drop of the Schottky diode.
D = (3.38 + 0.5) / 5 = 0.78
The ESR=18m ? for 2 of the Sanyo 1500 μ F, 6MV1500GX
caps. If L=3.5 μ H then, Fs is calculated as follows:
Where:
Rt = Top resistor of the resistor divider.
R H = Hysteresis resistor connected between pins 3
Fs =
[ (3.38 × (1 - 0.78) × 0.018) ]
(3.5 × 0.044)
= 0.087MHz
X = [ (Vo + )/V REF ] - 1
and 4 of the IRU3033.
? Vo = Selected output ripple (typically 1% to 2% of
output voltage).
Assuming, ? Vo=44mV:
R H = (11 × 1000) / 0.044 = 250K ?
Select R H = 249K ? , 1%
The bottom resistor of the divider is then calculated us-
ing the following equations:
R B = Rt / X
Where:
R B = Bottom resistor of the divider
V REF = 1.25V typical
? Vo
2
Fs = 87KHz
X = [ (3.38 +
0.044
2
)/1.25 ] - 1 = 1.72
R B = 1000 / 1.72 = 580 ?
Select R B = 576 ? , 1%
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3034 | 制造商:IRF 制造商全称:International Rectifier 功能描述:8-PIN PWM SWITCHER CONTROLLER IC WITH CURRENT LIMITING |
| IRU3034CS | 功能描述:IC CTRL/REG PWM SWITCH 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| IRU3034CSPBF | 制造商:International Rectifier 功能描述:PWM CONTROLLER SMD 3034 SOIC8 |
| IRU3034CSTR | 功能描述:IC CNTRL PWM SYNC SWITCH 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| IRU3034PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:8-PIN PWM SWITCHER CONTROLLER IC WITH CURRENT LIMITING |
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