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参数资料
| 型号： | IR3637ASPBF |
| 厂商： | International Rectifier |
| 文件页数： | 8/19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
For this design, IRF8910 is a good choice. The device
provides two N-MOSFETs in a compact SOIC 8-Pin pack-
These values are taken under a certain condition test.
For more detail please refer to the IRF8915 data sheet.
age.
By using equation (6), we can calculate the switching
The IRF8910 has the following data:
V DSS = 20V
I D = 10A
R DS(ON) =18.3 ? @ V GS =4.5V (Lower FET)
R DS(ON) =13.4 ? @ V GS =10V (Upper FET)
The total conduction losses will be:
P CON(TOTAL) =P CON (Upper Switch)+P CON (Lower Switch)
? = 1.4 according to the IRF8910 data sheet for
150 C junction temperature
P CON(TOTAL) =0.83W
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
losses.
P SW = 0.127mW
Feedback Compensation
The IR3637A 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 compensa-
tion 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 ).
The output LC filter introduces a double pole, –40dB/
decade gain slope above its corner resonant frequency,
and a total phase lag of 180 (see Figure 8). The Reso-
nant frequency of the LC filter expressed as follows:
switching times during the switching procedures such
as turn-on / turnoff delays and rise and fall times. The
control MOSFET contributes to the majority of the switch-
F LC =
2 π×
1
L O × C O
---(7)
ing losses in synchronous Buck converter. The synchro-
nous 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:
Figure 8 shows gain and phase of the LC filter. Since we
already have 180 phase shift just from the output filter,
the system risks being unstable.
t r + t f × I LOAD
P SW =
---(6)
V DS(OFF)
2
×
T
Where:
V DS(OFF) = Drain to Source Voltage at off time
Gain
0dB
-40dB/decade
Phase
0
t r = Rise Time
t f = Fall Time
T = Switching Period
I LOAD = Load Current
F LC Frequency
-180
F LC
Frequency
The switching time waveform is shown in figure 7.
V DS
90%
10%
V GS
Figure 8 - Gain and phase of LC filter.
The IIR3637A’s error amplifier is a differential-input
transconductance amplifier. The output is available for
DC gain control or AC phase compensation.
The E/A can be compensated with or without the use of
local feedback. When operated without local feedback
the transconductance properties of the E/A become evi-
dent and can be used to cancel one of the output filter
t d (ON)
t r
t d (OFF)
t f
poles. This will be accomplished with a series RC circuit
from Comp pin to ground as shown in Figure 9.
Figure 7 - Switching time waveforms.
From IRF8910 data sheet:
8
t r = 10ns
t f = 4.1ns
www.irf.com
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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 |
| IR3638 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Frequency Synchronous |
| IR3638DR2G | 制造商:ON Semiconductor 功能描述: |
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