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| 型号： | A4401KLTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC QUASI FLYBACK CONVERTER 8SOIC |
| 标准包装： | 1 |
| 显示器类型： | 真空荧光 (VF) |
| 电流 - 电源： | 2.3mA |
| 电源电压： | 7 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1217-6 |
A4401
Automotive Quasi-Resonant Flyback Control IC
It can be seen that at MOSFET turn-on there is a
considerable sinusoidal ringing on the voltage sense,
in the region of 3 MHz. In addition, there is a con-
siderable ringing during the MOSFET turn-off, in the
region of 6 MHz. These ringing effects are caused by
the primary-to-secondary leakage inductance interact-
ing with parasitic capacitance. These noise sources
will probably have an impact on the conducted emis-
sions and should therefore be suppressed.
By rescaling the magnetics so that 0 V switching is
achieved with V BAT = 13.5 V, the turn-on ringing is
almost completely damped, as shown in Figure 6.
Because the resonant capacitor, C11, had discharged
to 0 V before switching, there was effectively little
energy left.
The turn-off noise is also improved dramatically as
well. It can be seen that the ringing amplitude is lower,
dampens more quickly, and the ringing frequency
is higher making it easier to snub (see the Radiated
Emissions on the LX Node subsection). The reason for
MOSFET
Turn-On
V LX
MOSFET
Turn-Off
this effect is that a lower step-up ratio is required to
achieve the output voltage. This improves the mag-
netic coupling coefficient and therefore the leakage
inductance is reduced.
Running the system with a lower turns ratio means
that the duty cycle is greater. The advantage of this
is that the peak current is lower, resulting in lower
turn-off switching losses and reduced harmonics of the
input current, thus reducing the conducted emissions.
Radiated Emissions on LX Node A potential source
of radiated emissions is turning off the MOSFET. A
resonance is set up between the leakage inductance
of the magnetics and the parasitic capacitance on the
LX node. Assuming the magnetics are well designed
in terms of reducing leakage inductance, this reso-
nance should occur in the region of tens of megahertz.
Another potential source of radiated emissions is
turning off the output rectifying diodes. The following
procedure can be applied to address both issues.
MOSFET
Turn-On
MOSFET
Turn-Off
V LX
V RSENSE
V RSENSE
Figure 5. Voltages with 0 V switching of Q1 at V BAT of 7 V
Figure 6. Voltages with 0 V switching of Q1 at V BAT of 13.5 V
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
14
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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| A4402ELPTR-T | 功能描述:IC REG DL BUCK/LINEAR 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
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