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参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.65MHz |
| 占空比： | 92% |
| 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： | -40°C ~ 125°C |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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IR3640MPBF
The R DS(on) temperature dependency should be
considered for the worst case operation. This is
typically given in the MOSFET datasheet. Ensure
that the conduction losses and switching losses
do not exceed the package ratings or violate the
overall thermal budget.
V DS
90%
For this design, the IRF6710 is selected for
control FET and IRF6795 is selected for the
synchronous FET. These devices provide low on
resistance in a DirectFET package.
10%
V GS
t d (ON)
t r
t d (OFF)
t f
The MOSFETs have the following data:
Fig. 15: Switching time waveforms
ControlFET (IRF6710) :
V ds = 25 V,Q g = 8 . 8 nC
R ds(on) = 9 . 0 m ? @ V gs = 4 . 5 V
SyncFET (IRF6795) :
V ds = 25 V,Q g = 35 nC
R ds(on) = 2 . 4 m ? @ V gs = 4 . 5 V
By using equation (15), we can calculate the
switching losses. P sw =2.34W at Io=25A.
The reverse recovery loss is also another
V ds ( off ) t r + t f
P sw = * * I load - -(15)
The conduction losses will be: P cond =2.12W at
Io=25A. The switching loss is more difficult to
calculate, even though the switching transition is
well understood. The reason is the effect of the
parasitic components and switching times, such
as turn-on / turn-off delays and rise and fall
times. The control MOSFET contributes to the
majority of the switching losses in a synchronous
Buck converter. The synchronous MOSFET turns
on under zero voltage conditions, therefore, the
turn on losses for synchronous MOSFET can be
neglected. With a linear approximation, the total
switching loss can be expressed as:
2 T
Where:
V ds(off) = Drain to source voltage at the off time
t r = Rise time
t f = Fall time
T = Switching period
I load = Load current
The switching time waveforms is shown in Fig.
15.
From IRF6710 data sheet:
tr = 20ns
tf = 6ns
These values are taken under a certain test
condition. For more details please refer to the
IRF6710 data sheet.
06/15/2009
contributing factor in control FET switching
losses. This is equivalent to extra current
required to remove the minority charges from the
synchronous FET. The reverse recovery loss can
be expressed as:
P Qrr = Q rr *V in *F s
Q rr : Reverse Recovery Charge
V in : Input Bus Voltage
F s : Switching Frequency
The gate driving loss is the power consumption
to drive both the control and synchronous FETs.
The gate driving loss can be estimated as:
P Driver = Q g *V g *F s
Q g : Total Gate Charge
V g : Gate Driving Voltage
F s : Switching Frequency
Feedback Compensation
The IR3640 is a voltage mode controller. The
control loop is a single voltage feedback path
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
necessary. The goal of the compensation
network is to provide a closed-loop transfer
function with the highest 0dB crossing frequency
and adequate phase margin (greater than 45 o ).
18
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相关代理商/技术参数 |
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|---|---|
| IR3640MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz 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 |
| IR3651 | 制造商:IRF 制造商全称:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-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) |
| IR3651STRPBF | 功能描述:电压模式 PWM 控制器 High Volt Sych PWM 100V 400Mhz 1.25 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 |
| IR3651STRPBF-CUT TAPE | 制造商:IR 功能描述:IR3651SPbF Series 13.2 V 7 mA High Voltage Synchronous PWM Buck Controller |
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