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参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 22/32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
R 8 =
1
2 π * C 7 * F Z 2
- R 10 ; R 8 = 3.98 k Ω ,
Select R 7 =2.55KOhm
Using (24): R 6 =4.16KOhm
Select : R 8 = 4.02 k Ω
Select R 6 =4.12KOhm
Use a pull up resistor (4.99K) from PGood pin to
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.56 k Ω Select : R 9 = 2.55 k Ω
Vcc.
Layout Consideration
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R OCSET ) from the drain of
the low-side MOSFET to the OCSet pin. The
resistor can be calculated by using equation (3).
The R DS(on) has a positive temperature
coefficient and it should be considered for the
worst case operation. This resistor must be
placed close to the IC. This IC doesn't require a
small ceramic capacitor from OCset pin to
ground.
The layout is very important when designing high
frequency switching converters. Poor layout will
affect noise pickup and can cause a good design
to perform with less than expected results.
Start to place the power components, making all
the connection in the top layer with wide, copper
filled areas. The inductor, output capacitors and
the MOSFETS should be as close to each other
as possible. This helps to reduce the EMI
radiated by the power traces due to the high
switching currents through them. Place input
capacitor very close to the drain of the high-side
I SET = I L ( critical ) =
R OCSet ? I OCSet
R DS ( on )
R DS ( on ) = 2 . 4 m Ω * 1 . 5 = 3 . 6 m Ω
- - (23)
MOSFET.
The feedback part of the system should be kept
away from the inductor and other noise sources.
The critical bypass components such as
capacitors for Vcc and PVcc should be close to
R 6 = (
? 1 ) * R 7
0 . 9 * V out
I SET ? I o ( LIM ) = 25 A * 1 . 5 = 37 . 5 A
(50% over nominal output current)
I OCSet = 59 . 1 uA (at Fs = 600kHz)
R OCSet = 2 . 29 K Ω Select R 7 = 2 . 26 K Ω
Setting the Power Good Threshold
Power Good threshold can be programmed by
using two external resistors (R6, R7 in Page 23).
The following formula can be used to set the
threshold:
- - (24)
0 . 88 *V ref
Where: 0.88*V ref is reference of the internal
comparator, for IR3640, it is 0.62V
0.9*Vout is selectable threshold for power good,
for this design it is 1.62V.
06/15/2009
the respective pins. It is important to place the
feedback components including feedback
resistors and compensation components close to
Fb and Comp pins.
Place the Rocset resistor close to Ocset pin and
connect this with a short trace to SW pin.
In a multilayer PCB use one layer as a power
ground plane and have a control circuit ground
(analog ground), to which all signals are
referenced. The goal is to localize the high
current path to a separate loop that does not
interfere with the more sensitive analog control
function. These two grounds must be connected
together on the PC board layout at a single point.
The MLPQ is a thermally enhanced package.
Based on thermal performance it is
recommended to use 4-layers PCB. To
effectively remove heat from the device the
exposed pad should be connected to ground
plane using vias.
22
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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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