- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383325 > MAX1540A (Maxim Integrated Products, Inc.) Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator PDF資料下載
參數(shù)資料
| 型號： | MAX1540A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator |
| 中文描述： | 雙路、降壓型控制器，帶有電感飽和保護、動態(tài)輸出和線性穩(wěn)壓器 |
| 文件頁數(shù)： | 35/49頁 |
| 文件大小： | 794K |
| 代理商： | MAX1540A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁當(dāng)前第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁
Design Procedure
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
Input voltage range:
The maximum value (V
IN(MAX)
)
must accommodate the worst-case, high AC-adapter
voltage. The minimum value (V
IN(MIN)
) must account
for the lowest battery voltage after drops due to con-
nectors, fuses, and battery selector switches. If there
is a choice at all, lower input voltages result in better
efficiency.
Maximum load current:
There are two values to
consider. The peak load current (I
LOAD(MAX)
) deter-
mines the instantaneous component stresses and fil-
tering requirements and thus drives output capacitor
selection, inductor saturation rating, and the design of
the current-limit circuit. The continuous load current
(I
LOAD
) determines the thermal stresses and thus dri-
ves the selection of input capacitors, MOSFETs, and
other critical heat-contributing components.
Switching frequency:
This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage due to MOSFET switching losses that
are proportional to frequency and V
IN2
. The opti-
mum frequency is also a moving target, due to
rapid improvements in MOSFET technology that are
making higher frequencies more practical.
Inductor operating point:
This choice provides
trade-offs between size vs. efficiency and transient
response vs. output ripple. Low inductor values
provide better transient response and smaller phys-
ical size, but also result in lower efficiency and
higher output ripple due to increased ripple cur-
rents. The minimum practical inductor value is one
that causes the circuit to operate at the edge of crit-
ical conduction (where the inductor current just
touches zero with every cycle at maximum load).
Inductor values lower than this grant no further size-
reduction benefit. The optimum operating point is
usually found between 20% and 50% ripple current.
When pulse skipping (
SKIP
low and light loads), the
inductor value also determines the load-current
value at which PFM/PWM switchover occurs.
M
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
______________________________________________________________________________________
35
Figure 13. Internal Linear-Regulator Functional Diagram
VL REG
AND REF
GATE DRIVER
AND ERROR
AMP
LDOOUT
*V
DD
*MAX1541 ONLY.
*FBDLO
LDOON
*LDOIN
V+
0.2V
FIXED 5V
INTERNAL FBLDO
OPTION BETWEEN
THE MAX1540A/MAX1541
INTERNAL LDOIN
OPTION BETWEEN
THE MAX1540A/MAX1541
INTERNAL V
OPTION BETWEEN
THE MAX1540A/MAX1541
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1540AETJ | Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator |
| MAX1543 | TFT LCD DC-to-DC Converter with Operational Amplifiers |
| MAX1542 | TFT LCD DC-to-DC Converter with Operational Amplifiers |
| MAX1542-MAX1543 | TFT LCD DC-to-DC Converter with Operational Amplifiers |
| MAX1543ETP | TFT LCD DC-to-DC Converter with Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1540AETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540AETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。