参数资料
| 型号： | SC410MLTRT |
| 厂商： | Semtech |
| 文件页数： | 12/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 10MLPD |
| 标准包装： | 1 |
| 系列： | EcoSpeed® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 7.5 V |
| 输入电压： | 5.5 V ~ 24 V |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD（3x3） |
| 其它名称： | SC410MLDKR |
SC410
Applications Information
Synchronous Buck Converter
The SC410 is a step down synchronous buck DC-DC regu-
lator. The device is capable of 3A operation at very high
efficiency in a tiny 3 x 3-10 pin package. The programma-
ble operating frequency range of 200kHz – 1MHz enables
the user to optimize the design for minimum board space
and optimum efficiency.
The buck regulator employs pseudo-fixed frequency
adaptive on-time control. This control method allows fast
output voltage value and V IN . The period is proportional
to output voltage and inversely proportional to input
voltage. The value of the output voltage is obtained by
filtering the voltage seen on the LX pin.
With this adaptive on-time design, the device automati-
cally anticipates the on-time needed to regulate V OUT for
the present V IN condition and at the selected frequency.
The advantages of adaptive on-time control are:
transient response thereby lowering the size of the power
components used in the system.
Input Voltage Range
The SC410 can operate with a wide input voltage ranging
from 5.5V to 24V. The internal LDO generates a fixed 5V
output that provides power for the bias of the SC410. The
LDO can also provide additional power to an external load.
Psuedo-fixed Frequency Adaptive On-time Control
The PWM control method used by the SC410 is pseudo-
fixed frequency, adaptive on-time, as shown in Figure 1.
The ripple voltage generated at the output capacitor ESR
is divided down by the feedback resistor network and
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Predictable operating frequency during CCM
compared to other variable frequency
methods.
Reduced component count by eliminating the
error amplifier and compensation
components.
Reduced component count by removing the
need to sense and control inductor current.
Fast transient response — the response time is
controlled by a fast comparator instead of a
typically slow error amplifier.
Reduced output capacitance due to fast tran-
sient response
used as a PWM ramp signal. The ripple seen at the FB pin
is used to trigger the on-time of the controller.
One-Shot Timer and Operating Frequency
The one-shot timer operates as shown in Figure 2. The
V I N
TON
V LX
feedback comparator output goes high when V FB is less
than the internal 750mV reference. This feeds into the
Q1
C IN
V FB
FB Threshold
gate drive and turns on the high-side MOSFET, and also
starts the one-shot timer. The one-shot timer uses an
internal comparator, timing capacitor, and a low pass
Q2
V LX
L
ESR
+
C OUT
V OUT
FB
filter (LPF) which regenerates V OUT from LX. One compara-
tor input is connected to the filtered LX voltage, the other
input is connected to the capacitor. When the on-time
begins, the internal capacitor charges from zero volts
through a current which is proportional to V IN . When the
capacitor voltage reaches V OUT , the on-time is completed
and the high-side MOSFET turns off.
Figure 1 — PWM Control Method, V OUT Ripple
The adaptive on-time is determined by an internal one-
shot timer. When the one-shot is triggered by the feed-
back ripple, the device sends a single on-time pulse to the
high-side MOSFET. The pulse period is determined by the
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC411 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller |
| SC411201B | 制造商:Freescale Semiconductor 功能描述:MOTSC411201B ACCTON:110000000028H |
| SC411209B | 制造商:Freescale Semiconductor 功能描述: |
| SC411212C | 制造商:Freescale Semiconductor 功能描述: |
| SC411EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller |
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