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| 型号： | IR3637ASPBF |
| 厂商： | International Rectifier |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 95 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 660kHz |
| 占空比： | 76% |
| 电源电压： | 4.5 V ~ 5.5 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 ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 配用： | IRPP3637-12A-ND - KIT REF DES 12A 1PH SYNC BUCK IRDC3637-ND - BOARD EVAL SYNC BUCK REGULATOR |
IR3637ASPbF
ESR ≤
? V O
? I O
I RMS = I OUT D × (1-D) ---(3)
Where:
D is the Duty Cycle, D=V OUT /V IN.
I RMS is the RMS value of the input capacitor current.
I OUT is the output current for each channel.
For I OUT =6A and D=0.36, the I RMS =2.8A
For higher efficiency, low ESR capacitor is recommended.
Two capacitors of Sanyo's TPB series PosCap with
150 μ F, 6.3V, 40m ? ESR and 1.4A ripple current will
meet the ripple current requirement.
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, faster response to a load transient but poor effi-
ciency and high output noise. Generally, 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% ripple of the output cur-
rent.
The ESR of the output capacitor is calculated by the
following relationship:
---(4)
Where:
? V O = Output Voltage Ripple
? I O = Inductor Ripple Current
? V O =50mV and ? I O =1.92A
Results to ESR=26.8m ?
The Sanyo TPB series, PosCap capacitor is a good
choice. The 6TPB150M 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.
Power MOSFET Selection
The IR3637A 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 ).
For the buck converter, the inductor value for desired
operating ripple current can be determined using the fol-
lowing relation:
The gate drive requirement is almost the same for both
MOSFETs. Logic-level transistor can be used and cau-
V IN - V OUT = L ×
; ? t = D ×
L = (V IN - V OUT ) ×
? i
? t
V OUT
V IN ×? i × f S
Where:
V IN = Maximum Input Voltage
V OUT = Output Voltage
? i = Inductor Ripple Current
1
f S
;D=
---(5)
V OUT
V IN
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:
P COND (Upper Switch) = I LOAD × R DS(ON) × D × ?
P COND (Lower Switch) = I LOAD × R DS(ON) × (1 - D) × ?
f S = Switching Frequency
? t = Turn On Time
D = Duty Cycle
If ? i = 32%(I O ), then the output inductor will be:
L = 1.0 μ H
The Coilcraft DO3316P series provides a range of induc-
tors in different values, low profile suitable for large cur-
rents, 1.0 μ H, 9A(Isat) is a good choice for this applica-
tion.
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.
www.irf.com
2
2
? = R DS(ON) Temperature Dependency
The R DS(ON) temperature dependency should be consid-
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.
7
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相关代理商/技术参数 |
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| IR3637ASTRPBF | 功能描述:开关变换器、稳压器与控制器 High Volt Sych PWM 600kHz 5V PWM 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 |
| IR3637SPBF | 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) |
| IR3637STRPBF | 功能描述:开关变换器、稳压器与控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR 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 |
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| IR3638DR2G | 制造商:ON Semiconductor 功能描述: |
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