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參數(shù)資料
| 型號(hào)： | MAX1639ESE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Speed Step-Down Controller with Synchronous Rectification for CPU Power |
| 中文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 108K |
| 代理商： | MAX1639ESE |
M
High-S peed S tep-Down Controller with
S ync hronous Rec tific ation for CPU Power
_______________________________________________________________________________________
9
BS T High-S ide Gate-Driver S upply
and MOS FET Drivers
Gate-drive voltage for the high-side N-channel switch
is generated using a flying-capacitor boost circuit
(Figure 3). The capacitor is alternately charged from
the +5V supply and placed in parallel with the high-
side MOSFET’s gate and source terminals.
Gate-drive resistors (R3 and R4) can often be useful to
reduce jitter in the switching waveforms by slowing
down the fast-slewing LX node and reducing ground
bounce at the controller IC. However, switching loss
may increase. Low-value resistors from around 1
to
5
are sufficient for many applications.
Current S ense
and Overload Current Limiting
The current-sense circuit resets the main PWM latch
and turns off the high-side MOSFET switch whenever
the voltage difference between CSH and CSL from cur-
rent through the sense resistor (R1) exceeds the peak
current limit (100mV typical).
Current-mode control provides cycle-by-cycle current-
limit capability for maximum overload protection.
During normal operation, the peak current limit set by
the current-sense resistor determines the maximum
output current. When the output is shorted, the peak
current may be higher than the set current limit due to
delays in the current-sense comparator. Thus, foldback
current limiting is employed where the set current-limit
point is reduced from 100mV to 38mV as the output
(feedback) voltage falls (Figure 4). When the short-
circuit condition is removed, the feedback voltage will
rise and the current-limit voltage will revert to 100mV.
The foldback current-limit circuit is designed to ensure
startup into a resistive load.
High-S ide Current S ensing
The common-mode input range of the current-sense
inputs (CSH and CSL) extends to V
CC
, so it is possible
to configure the circuit with the current-sense resistor
on the input side rather than on the load side (Figure 5).
This configuration improves efficiency by reducing the
power dissipation in the sense resistor according to the
duty ratio.
In the high-side configuration, if the output is shorted
directly to GND through a low-resistance path, the
current-sense comparator may be unable to enforce a
current limit. Under such conditions, circuit parasitics
such as MOSFET R
DS(ON)
typically limit the short-
circuit current to a value around the peak-current-
limit setting.
Attach a lowpass-filter network between the current-
sense pins and resistor to reduce high-frequency
common-mode noise. The filter should be designed
with a time constant of around one-fifth of the on-time
(130ns at 600kHz, for example). Resistors in the 20
to
100
range are recommended for R9 and R10.
Connect the filter capacitors C9 and C10 from V
CC
to
CSH and CSL, respectively.
Values of 39
and 3.3nF are suitable for many
designs. Place the current-sense filter network close to
the IC, within 0.1 in (2.5mm) of the CSH and CSL pins.
C3
C1
L1
D2
V
IN
= 5V
V
DD
N1
R4
DH
LEVEL
TRANSLATOR
CONTROL AND
DRIVE LOGIC
N2
R3
PGND
R3 AND R4
ARE OPTIONAL
LX
DL
BST
MAX1639
Figure 3. Boost Supply for Gate Drivers
0
20
10
50
40
30
60
70
100
90
80
20 30
10
0
40 50 60 70 80 90 100
V
FB
(%)
I
L
Figure 4. Foldback Current Limit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1639ESE+ | 功能描述:DC/DC 開關(guān)控制器 High Speed Step Down 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 |
| MAX1639ESE+T | 功能描述:DC/DC 開關(guān)控制器 High Speed Step Down 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 |
| MAX1639ESE-T | 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 |
| MAX1639EVKIT | 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit the MAX1639 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 |
| MAX163BCNG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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