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| 型号： | IRU3048CSTR |
| 厂商： | International Rectifier |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 3 |
| 频率 - 最大： | 220kHz |
| 占空比： | 90% |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | *IRU3048CSTR IRU3048CSCT |
IRU3048
Cross Over Frequency:
8) Use equation (1) to calculate R 5 :
F O1 = R 7 3 C 10 3
V IN
V OSC
3
1
2 p3 Lo 3 Co
---(15)
R 5 =
V REF
V OUT - V REF
3 R 6
Where:
V IN = Maximum Input Voltage
V OSC = Oscillator Ramp Voltage
Lo = Output Inductor
Co = Total Output Capacitors
The stability requirement will be satisfied by placing the
poles and zeros of the compensation network according
to following design rules. The consideration has been
taken to satisfy condition 14 regarding transconduc-
These design rules will give a crossover frequency ap-
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45 8 for
overall stability.
LDO Section
tance error amplifier.
Output Voltage Programming
1) Select the crossover frequency:
Fo < F ESR and Fo [ (1/10 ~ 1/6) 3 f S
Output voltage for LDO is programmed by reference volt-
age and external voltage divider. The Fb3 pin is the in-
verting input of the error amplifier, which is internally ref-
2) Select R 7 , so that R 7 >>
2
g m
erenced to 1.25V. The divider is ratioed to provide 1.25V
at the Fb3 pin when the output is at its desired value.
The output voltage is defined by using the following equa-
3) Place first zero before LC’s resonant frequency pole.
tion:
(
F Z1 ? 75% F LC
1
C 11 =
2 p 3 F Z1 3 R 7
4) Place third pole at the half of the switching frequency.
V OUT2 = V REF 3 1+
For:
V OUT2 = 2.5V
V REF = 1.25V
R HIGH
R LOW
)
F P3 =
C 12 =
f S
2
1
2 p 3 R 7 3 F P3
R LOW = 1K
Results to: R HIGH =1K
LDO Power MOSFET Selection
C 12 > 50pF
If not, change R 7 selection.
5) Place R 7 in (15) and calculate C 10 :
The first step in selecting the power MOSFET for the
linear regulator is to select the maximum R DS(ON) based
on the input to the dropout voltage and the maximum
load current.
C 10 [
2 p 3 Lo 3 F O 3 Co
R 7
3
V OSC
V IN
R DS(ON) =
V IN3 - V OUT2
I OUT2
g m
6) Place second pole at ESR zero.
F P2 = F ESR
1
R 8 =
2 p 3 C10 3 F P2
1
Check if R 8 >
If R 8 is too small, increase R 7 and start from step 2.
7) Place second zero around the resonant frequency.
F Z2 = F LC
For:
V IN3 = 3.3V
V OUT2 = 2.5V
I OUT2 = 2A
Results to: R DS(ON)(MAX) = 0.4 V
Note that since the MOSFET R DS(ON) increases with tem-
perature, this number must be divided by ~1.5 in order
to find the R DS(ON)(MAX) at room temperature. The IRLR2703
has a maximum of 0.065 V R DS(ON) at room temperature,
which meets our requirements.
R 6 =
1
2 p 3 C10 3 F Z2
- R 8
10
www.irf.com
Rev. 1.7
09/12/02
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相关代理商/技术参数 |
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| IRU3048CSTRPBF | 制造商:International Rectifier 功能描述:Dual Synchronous PWM Controller Circuitry and LDO Controller 16-Pin SOIC N T/R |
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| IRU3055CQ | 制造商:IRF 制造商全称:International Rectifier 功能描述:5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC |
| IRU3055CQTR | 功能描述:IC CTRL SYNC 3-PHASE 36-QSOP 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) |
| IRU3065 | 制造商:IRF 制造商全称:International Rectifier 功能描述:POSITIVE TO NEGATIVE DC TO DC CONTROLLER |
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