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参数资料
| 型号： | IRU3037CSTR |
| 厂商： | International Rectifier |
| 文件页数： | 5/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 220kHz |
| 占空比： | 95% |
| 电源电压： | 4.2 V ~ 25 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： | 带卷 (TR) |
IRU3037/IRU3037A & (PbF)
APPLICATION INFORMATION
Design Example:
The following example is a typical application for IRU3037,
the schematic is Figure 18 on page 14.
V IN = 5V
V OUT = 3.3V
I OUT = 4A
? V OUT = 100mV
f S = 200KHz
Output Voltage Programming
Output voltage is programmed by reference voltage and
external voltage divider. The Fb pin is the inverting input
of the error amplifier, which is internally referenced to
1.25V (0.8V for IRU3037A). The divider is ratioed to pro-
vide 1.25V at the Fb pin when the output is at its desired
value. The output voltage is defined by using the follow-
ing equation:
Soft-Start Programming
The soft-start timing can be programmed by selecting
the soft start capacitance value. The start up time of the
converter can be calculated by using:
t START = 75 × Css (ms) ---(2)
Where:
C SS is the soft-start capacitor ( μ F)
For a start-up time of 7.5ms, the soft-start capacitor will
be 0.1 μ F. Choose a ceramic capacitor at 0.1 μ F.
Shutdown
The converter can be shutdown by pulling the soft-start
pin below 0.5V. The control MOSFET turns off and the
synchronous MOSFET turns on during shutdown.
(
V OUT = V REF ×
1+
R 6
R 5
)
---(1)
Boost Supply Vc
To drive the high-side switch it is necessary to supply a
gate voltage at least 4V greater than the bus voltage.
This is achieved by using a charge pump configuration
When an external resistor divider is connected to the
output as shown in Figure 3.
V OUT
as shown in Figure 18. The capacitor is charged up to
approximately twice the bus voltage. A capacitor in the
range of 0.1 μ F to 1 μ F is generally adequate for most
applications. In application, when a separate voltage
IRU3037
Fb
R 6
R 5
source is available the boost circuit can be avoided as
shown in Figure 1.
Input Capacitor Selection
The input filter capacitor should be based on how much
ripple the supply can tolerate on the DC input line. The
larger capacitor, the less ripple expected but consider
Figure 3 - Typical application of the IRU3037 for
programming the output voltage.
Equation (1) can be rewritten as:
should be taken for the higher surge current during the
power-up. The IRU3037 provides the soft-start function
which controls and limits the current surge. The value of
the input capacitor can be calculated by the following
( V V
R 6 = R 5 ×
)
OUT
REF
Choose R 5 = 1K ?
-1
formula:
C IN =
I IN × ? t
? V
---(3)
This will result to R 6 = 1.65K ?
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
in output voltage. The output voltage set point can be
more accurate by using precision resistor.
Where:
C IN is the input capacitance ( μ F)
I IN is the input current (A)
? t is the turn on time of the high-side switch ( μ s)
? V is the allowable peak to peak voltage ripple (V)
www.irf.com
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3037CSTRPBF | 功能描述:开关变换器、稳压器与控制器 8 PWM 200 KHZ 200kHz Synch CTRL RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IRU3038 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3038CF | 功能描述:IC REG CTRLR BUCK PWM VM TSSOP14 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| IRU3038CFTRPBF | 制造商:International Rectifier 功能描述:Voltage Mode PWM Controller 500mA 14-Pin TSSOP T/R |
| IRU3038CS | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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