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参数资料
| 型号： | IRU3046CFTR |
| 厂商： | International Rectifier |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24TSSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 450kHz |
| 占空比： | 90% |
| 电源电压： | 5 V ~ 12 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： | 24-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | *IRU3046CFTR IRU3046CFCT |
IRU3046
APPLICATION INFORMATION
Design Example:
The following example is a typical application for IRU3046
in current sharing mode. The schematic is Figure 13 on
page 15.
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:
For Switcher:
For Linear Regulator:
t START = 75 3 Css (ms)
---(2)
V IN1(MASTER) = 5V
V IN2(SLAVE) = 12V
V OUT1 = 1.5V
I OUT = 16A
D V OUT = 75mV
f S = 200KHz
PWM Section
V IN3 = 3.3V
V OUT2 = 2.5V
I OUT2 = 2A
Where:
C SS is the soft-start capacitor ( m F)
For a start-up time of 7.5ms, the soft-start capacitor will
be 0.1 m F. Choose a ceramic capacitor at 0.1 m F.
Boost Supply
To drive the high-side switch it is necessary to supply a
Output Voltage Programming
Output voltage is programmed by reference voltage and
external voltage divider. The Fb1 pin is the inverting input
of the error amplifier, which is internally referenced to
1.25V. The divider is ratioed to provide 1.25V at the Fb1
pin when the output is at its desired value. The output
voltage is defined by using the following equation:
gate voltage at least 4V greater than the bus voltage.
This is achieved by using a charge pump configuration
as shown in Figure 1. The capacitor is charged up to
approximately twice the bus voltage. A capacitor in the
range of 0.1 m F to 1 m F is generally adequate for most
applications.
(
V OUT1 = V REF 3
1+
R 6
R 5
)
---(1)
Sense Resistor Selection
These resistors will determine the current sharing
between two channels. The relationship between the
Master and Slave output currents is expressed by:
When an external resistor divider is connected to the
output as shown in Figure 3.
R SEN1 3 I MASTER = R SEN2 3 I SLAVE
---(3)
For an equal current sharing, R SEN1 =R SEN1
V OUT1
Choose R SEN1 =R SEN2 =5m V
IRU3046
Fb1
R 6
R 5
Input Capacitor selection
The input filter capacitor should be based on how much
ripple the supply can tolerate on the DC input line. The
ripple current generated during the on time of control
MOSFET should be provided by input capacitor. The RMS
value of this ripple is expressed by:
Figure 3 - Typical application of the IRU3046 for
programming the output voltage.
I RMS = I OUT
D 3 (1-D)
---(4)
Where:
Equation (1) can be rewritten as:
D is the Duty Cycle, simply D=V OUT /V IN.
( V V
R 6 = R 5 3
)
OUT1
REF
-1
I RMS is the RMS value of the input capacitor current.
I OUT is the output current for each channel.
This will result to:
V OUT1 = 1.5V, V REF = 1.25V, R 5 = 1K, R 6 = 200 V
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.
For V IN1 =5V, I OUT1 =8A and D1=0.3
Results to: I RMS1 =3.6A
And for V IN2 =12V, I OUT2 =8A and D2=0.125
Results to: I RMS2 =2.6A
6
www.irf.com
Rev. 1.9
09/27/02
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相关代理商/技术参数 |
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| IRU3046CFTRPBF | 制造商:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
| IRU3047 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
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| IRU3047CWTR | 功能描述:IC REG CTRLR BUCK PWM VM 20-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| IRU3048 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER |
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