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参数资料
| 型号： | IRDC3637 |
| 厂商： | International Rectifier |
| 文件页数： | 7/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK REGULATOR |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 7A |
| 输入电压： | 4.5 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3637 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 相关产品： | IR3637ASTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637ASPBF-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFDKR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFCT-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFTR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637SPBF-ND - IC REG CTRLR BUCK PWM VM 8-SOIC |
IR3637SPBF
ESR ≤
? 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:
? V O
---(4)
Where:
? V O = Output Voltage Ripple
? I O = Inductor Ripple Current
? V O =50mV and ? I O =2.4A
Results to ESR=20.8m ?
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 IR3637 uses two N-Channel MOSFETs. The selec-
tions 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 = 40%(I O ), then the output inductor will be:
L = 1.2 μ H
The Coilcraft DO3316 series provides a range of induc-
tors in different values, low profile suitable for large cur-
rents, 1.5 μ H, 8A(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.
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.
Rev. 1.1
06/16/05
www.irf.com
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3637EVAL | 制造商:IRF 制造商全称:International Rectifier 功能描述:IR3637 EVALUATION BOARD USER GUIDE |
| IRDC3640 | 功能描述:电源管理IC开发工具 IR3640 12V PWM 1.5MHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3651 | 功能描述:电源管理IC开发工具 IR3651 EVAL BRD 400kHz RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3710-DF | 功能描述:电源管理IC开发工具 1 PHASE SYNC-BUCK PWM CTRLLER IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3710-QFN | 功能描述:电源管理IC开发工具 1 PHASE SYNC-BUCK PWM CTRLLER IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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