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| 型号： | IRU3037CFPBF |
| 厂商： | International Rectifier |
| 文件页数： | 6/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-TSSOP |
| 标准包装： | 100 |
| 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-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
IRU3037/IRU3037A & (PbF)
Assuming the following:
? V = 1%(V IN ), Efficiency( η ) = 90%
V IN - V OUT = L ×
? i
? t
; ? t = D ×
1
f S
;D=
V OUT
V IN
? t = D ×
? t = 3.3 μ s
I IN = η × V IN
L = (V IN - V OUT ) ×
1
f S
V O × I O
I IN = 2.93A
By using equation (3), C IN = 193.3 μ F
For higher efficiency, low ESR capacitor is recommended.
Choose two 100 μ F capacitors.
V OUT
V IN ×? i × f S
Where:
V IN = Maximum Input Voltage
V OUT = Output Voltage
? i = Inductor Ripple Current
f S = Switching Frequency
? t = Turn On Time
---(5)
ESR ≤
? I O
P COND (Upper Switch) = I LOAD × R DS(ON) × D × ?
P COND (Lower Switch) = I LOAD × R DS(ON) × (1 - D) × ?
The Sanyo TPB series PosCap capacitor 100 μ F, 10V
with 55m ? ESR is a good choice.
Output Capacitor Selection
The criteria to select the output capacitor is normally
based on the value of the Effective Series Resistance
(ESR). In general, the output capacitor must have low
enough ESR to meet output ripple and load transient
requirements, yet have high enough ESR to satisfy sta-
bility requirements. The ESR of the output capacitor is
calculated by the following relationship:
? V O
---(4)
Where:
? V O = Output Voltage Ripple
? I O = Output Current
? V O =100mV and ? I O =4A
Results to ESR=25m ?
The Sanyo TPC series, PosCap capacitor is a good
choice. The 6TPC150M 150 μ F, 6.3V has an ESR 40m ? .
Selecting two of these capacitors in parallel, results to
an ESR of ? 20m ? which achieves our low ESR goal.
The capacitor value must be high enough to absorb the
inductor's ripple current. The larger the value of capaci-
tor, the lower will be the output ripple voltage.
Inductor Selection
The inductor is selected based on output power, operat-
ing frequency and efficiency requirements. Low inductor
value causes large ripple current, resulting in the smaller
size, but poor efficiency and high output noise. Gener-
ally, the selection of inductor value can be reduced to
desired maximum ripple current in the inductor ( ? i). The
optimum point is usually found between 20% and 50%
D = Duty Cycle
If ? i = 20%(I O ), then the output inductor will be:
L = 7 μ H
The Toko D124C series provides a range of inductors in
different values, low profile suitable for large currents,
10 μ H, 4.2A is a good choice for this application. This
will result to a ripple approximately 14% of output cur-
rent.
Power MOSFET Selection
The IRU3037 uses two N-Channel MOSFETs. The se-
lections criteria to meet power transfer requirements is
based on maximum drain-source voltage (V DSS ), gate-
source drive voltage (V GS ), maximum output current, On-
resistance R DS(ON) and thermal management.
The MOSFET must have a maximum operating voltage
(V DSS ) exceeding the maximum input voltage (V IN ).
The gate drive requirement is almost the same for both
MOSFETs. Logic-level transistor can be used and cau-
tion should be taken with devices at very low V GS to pre-
vent undesired turn-on of the complementary MOSFET,
which results a shoot-through current.
The total power dissipation for MOSFETs includes con-
duction and switching losses. For the Buck converter
the average inductor current is equal to the DC load cur-
rent. The conduction loss is defined as:
2
2
? = R DS(ON) Temperature Dependency
ripple of the output current.
The R DS(ON) temperature dependency should be consid-
For the buck converter, the inductor value for desired
operating ripple current can be determined using the fol-
lowing relation:
ered for the worst case operation. This is typically given
in the MOSFET data sheet. Ensure that the conduction
losses and switching losses do not exceed the package
ratings or violate the overall thermal budget.
6
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相关代理商/技术参数 |
参数描述 |
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| IRU3037CFTR | 功能描述:IC REG CTRLR BUCK PWM VM 8-TSSOP 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:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IRU3037CFTRPBF | 功能描述:电压模式 PWM 控制器 8 PWM 200 KHZ 200kHz Synch CTRL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IRU3037CS | 功能描述:IC REG CTRLR BUCK PWM VM 8-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:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IRU3037CSPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IRU3037CSTR | 功能描述:电压模式 PWM 控制器 8 PWM 200 KHZ 200kHz Synch CTRL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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