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參數(shù)資料
| 型號： | SC427MLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 16/33頁 |
| 文件大?。?/td> | 894K |
| 描述： | IC REG DL BUCK/LINEAR 32MLPQ |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| 拓?fù)洌?/td> | 降壓（降壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 2 |
| 頻率 - 開關(guān)： | 1MHz |
| 電壓/電流 - 輸出 1： | 可調(diào)，10A |
| 電壓/電流 - 輸出 2： | 5V，200mA |
| 帶 LED 驅(qū)動器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 無 |
| 電源電壓： | 3 V ~ 28 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-MLPQ（5x5） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | SC427MLDKR |
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SC417/SC427
16
Synchronous Buck Converter
The SC417/SC427 is a step down synchronous DC-DC buck
converter with integrated power MOSFETs and a program-
mable LDO. The device is capable of 10A operation at very
high efficiency. A space saving 5x5 (mm) 32-pin package
is used. The programmable operating frequency range of
200kHz to 1MHz enables optimizing the configuration for
PCB area and efficiency.
The buck controller uses a pseudo-fixed frequency adap-
tive on-time control. This control method allows fast tran-
sient response which permits the use of smaller output
capacitors.
In addition to the following information, the user can
click on the applicable link to go to the SC417 online
C-SIM design and simulation tool or to go to the SC427
online C-SIM design and simulation tool, which will
lead the user through the design process.
Input Voltage Requirements
The SC417/SC427 requires two input supplies for normal
operation: VIN and V5V. VIN operates over the wide range
from 3V to 28V. V5V requires a 5V supply input that can be
an external source or the internal LDO configured to
supply 5V from VIN.
Power Up Sequence
When the SC417/SC427 uses an external power source at
the V5V pin, the switching regulator initiates the start-up
process when VIN, V5V, and EN/PSV are above their respec-
tive thresholds. When EN/PSV is at a logic high, V5V needs
to be applied after VIN rises. To start using the EN/PSV pin
when both V5V and VIN are above their respective thresh-
olds, apply EN/PSV to enable the start-up process. For
SC417/SC427 in self-biased mode, refer to the LDO section
for a full description.
Shutdown
The SC417/SC427 can be shutdown by pulling either V5V
or EN/PSV below its threshold. When V5V is active and
EN/PSV at low logic, the output voltage discharges
through an internal FET.
Psuedo-fixed Frequency Adaptive On-time Control
The PWM control method used by the SC417/SC427 is
pseudo-fixed frequency, adaptive on-time, as shown in
Figure 1. The ripple voltage generated at the output
capacitor ESR is used as a PWM ramp signal. This ripple is
used to trigger the on-time of the controller.
The adaptive on-time is determined by an internal one-
shot timer. When the one-shot is triggered by the output
ripple, the device sends a single on-time pulse to the high-
side MOSFET. The pulse period is determined by V
OUT
and
V
IN
; the period is proportional to output voltage and
inversely proportional to input voltage. With this adaptive
on-time arrangement, the device automatically antici-
pates the on-time needed to regulate V
OUT
for the present
V
IN
condition and at the selected frequency.
Q1
Q2
L
C
OUT
ESR
+
C
IN
V
OUT
FB Threshold
V
FB
V
LX
V
LX
TON
FB
V
IN
Figure 1 PWM Control Method, V
OUT
Ripple
The advantages of adaptive on-time control are:
Predictable operating frequency 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 typi-
cally slow error amplifier.
Reduced output capacitance due to fast tran-
sient response
One-Shot Timer and Operating Frequency
The one-shot timer operates as shown in Figure 2. The FB
Comparator output goes high when V
FB
is less than the
"
"
"
"
"
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC428 | 制造商:Mallory 功能描述:Sonalert |
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