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参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/32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
Operating Frequency
The switching frequency can be programmed
between 250kHz – 1500kHz by using an external
resistor from R t to Gnd. Table 1 tabulates the
oscillator frequency versus R t . Trailing edge
modulation is used for generating PWM
signal(Fig.7) .
Table 1. Switching Frequency and
I OCSet vs. External Resistor ( R t )
Over-Current Protection
The over current protection is performed by
sensing current through the R DS(on) of low side
MOSFET. This method enhances the converter’s
efficiency and reduce cost by eliminating a
current sense resistor. As shown in Fig. 8, an
external resistor (R OCset is connected between
OCSet pin and the drain of low side MOSFET
(Q2) which sets the current limit set point.
R t (k ? )
47.5
35.7
28.7
23.7
20.5
F s (kHz)
300
400
500
600
700
I ocset ( μ A)
29.4
39.2
48.7
59.07
68.2
The internal current source develops a voltage
across R SET . An internal current source sources
current ( I OCSet ) out of the OCSet pin. This
current is a function of the switching frequency
and hence, of R t . Table 1. shows I OCSet at
different switching frequencies.
17.8
15.8
14.3
800
900
1000
78.6
88.6
97.9
I OCSet ( μ A ) =
1400
R t (k Ω )
- - ( 2 )
12.7
1100
110.2
11.5
1200
121.7
I OCSET
10.7
9.76
1300
1400
130.8
143.4
IR3640
OCSet R SET
Q1
L1
V OUT
9.31
1500
150.3
Hiccup
Control
Q2
Ramp
V C
Clock
Cntl gate
Sync gate
Fig. 8: Connection of over current sensing resistor
When the low side MOSFET is turned on, the
inductor current flows through the Q2 and results
a voltage which is given by:
V OCSet = ( I OCSet ? R OCSet ) ? ( R
Fig. 7: Trailing-edge Modulation
DS (on )
? I L )
- -(3)
Frequency Synchronization
The IR3640 is capable of accepting an external
digital synchronization signal. Synchronization
will be enabled by the rising edge at an external
clock. The switching frequency is set by
An over current is detected if the OCSet pin goes
below ground. Hence, at the current limit
threshold, V OCset =0. Then, for a current limit
setting I Limit , R OCSet is calculated as follows:
external resistor (R t ). During synchronization, R t
is selected such that the free running frequency
is 20% below the synchronization frequency.
R OCSet =
R DS ( on ) * I Limit
I OCSet
- -(4)
When unused, the sync pin will remain floating
and is noise immune.
06/15/2009
11
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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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