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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)： | 27/49頁 |
| 文件大?。?/td> | 794K |
| 代理商： | MAX1540A |
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ment (Figure 1). If the magnitude of the current-sense
signal is above the valley current-limit threshold, the
PWM controller is not allowed to initiate a new cycle
(Figures 3 and 5). The actual peak current is greater
than the valley current-limit threshold by an amount
equal to the inductor ripple current. Therefore, the exact
current-limit characteristic and maximum load capability
are a function of the current-sense resistance, inductor
value, and battery voltage. When combined with the
undervoltage protection circuit, this current-limit method
is effective in almost every circumstance. Figure 6
shows the valley current-limit threshold point.
In forced-PWM mode, the MAX1540A/MAX1541 also
implement a negative current limit to prevent excessive
reverse inductor currents when V
OUT
is sinking current.
The negative current-limit threshold is set to approxi-
mately 120% of the positive current limit and tracks the
positive current limit when ILIM is adjusted.
The current-limit threshold is adjusted with an external
resistor-divider at ILIM_. A 2μA to 20μA divider current
is recommended for accuracy and noise immunity. The
current-limit threshold adjustment range is from 25mV
to 200mV. In the adjustable mode, the current-limit
threshold voltage is precisely 1/10th the voltage seen at
ILIM_. The threshold defaults to 50mV when ILIM_ is
connected to V
CC
. The logic threshold for switchover to
the 50mV default value is approximately V
CC
- 1V.
Carefully observe the PC board layout guidelines to
ensure that noise and DC errors do not corrupt the dif-
ferential current-sense signals seen by CSP_ and
CSN_. Place the IC close to the sense resistor with
short, direct traces, making a Kelvin-sense connection
to the current-sense resistor.
M
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
______________________________________________________________________________________
27
Figure 5. MAX1540A/MAX1541 Current-Limit Functional Diagram
S
R
Q
QUAD-LEVEL
DECODE
SATURATION
LIMIT
VALLEY CURRENT
LIMIT
ZERO
CROSSING
DH DRIVER
9R
R
0.5V
CSP_
SKIP
CSN_
ILIM_
6
μ
A
V
CC
- 1.0V
LSAT
Figure 6. Valley Current-Limit Threshold Point
I
I
LIMIT
I
LOAD
0
TIME
I
PEAK
I
LIM(VAL)
= I
LOAD(MAX)
1-LIR
2
)
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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 |
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