參數(shù)資料
型號(hào)： MAX1537A
廠商： Maxim Integrated Products, Inc.
英文描述： High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers
中文描述： 高效率、5路輸出、主電源控制器，用于筆記本電腦
文件頁(yè)數(shù)： 23/38頁(yè)
文件大?。?/td> 1427K
代理商： MAX1537A
M
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
______________________________________________________________________________________
23
Output Voltage
DC output accuracy specifications in the
Electrical
Characteristics
table refer to the error-comparator’s
threshold. When the inductor continuously conducts,
the MAX1533A/MAX1537A regulate the peak of the out-
put ripple, so the actual DC output voltage is lower than
the slope-compensated trip level by 50% of the output
ripple voltage. For PWM operation (continuous conduc-
tion), the output voltage is accurately defined by the fol-
lowing equation:
where V
NOM
is the nominal output voltage, A
SLOPE
equals 1%, and V
RIPPLE
is the output ripple voltage
(V
RIPPLE
= ESR x
Δ
I
INDUCTOR
as described in the
Output Capacitor Selection
section).
In discontinuous conduction (I
OUT
< I
LOAD(SKIP)
), the
MAX1533A/MAX1537A regulate the valley of the output
ripple, so the output voltage has a DC regulation level
higher than the error-comparator threshold. For PFM
operation (discontinuous conduction), the output volt-
age is approximately defined by the following equation:
where V
NOM
is the nominal output voltage, f
OSC
is the
maximum switching frequency set by the internal oscil-
lator, f
SW
is the actual switching frequency, and I
IDLE
is
the idle-mode inductor current when pulse skipping.
Adjustable/Fixed Output Voltages
(Dual-Mode Feedback)
Connect FB3 and FB5 to GND to enable the fixed
SMPS output voltages (3.3V and 5V, respectively), set
by a preset, internal resistive voltage-divider connected
between CSL_ and analog ground. Connect a resistive
voltage-divider at FB_ between CSL_ and GND to
adjust the respective output voltage between 1V and
5.5V (Figure 5). Choose R2 (resistance from FB to
GND) to be about 10k
Ω
and solve for R1 (resistance
from OUT to FB) using the equation:
where V
FB_
= 1V nominal.
R
R
V
V
OUT
FB
1
2
1
_
_
=
V
V
f
f
I
ESR
OUT PFM
(
NOM
SW
OSC
IDLE
)
×
=
+
1
2
V
V
A
V
V
OUT PWM
(
NOM
SLOPE NOM
IN
RIPPLE
2
)
=
1
-
-
t
ON(SKIP)
≥
I
IDLE
L
V
IN
- V
OUT
I
I
LOAD(SKIP)
TIME
ON-TIME
0
CSL
TO ERROR
AMPLIFIER
REF
(2.0V)
R
12R
FB
FIXED OUTPUT
FB = GND
ADJUSTABLE
OUTPUT
Figure 4. Pulse-Skipping/Discontinuous Crossover Point
Figure 5. Dual-Mode Feedback Decoder
相關(guān)PDF資料
PDF描述
MAX1533 High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1537AETX+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1537ETX 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX1537ETX-T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX1537EVKIT 制造商:Maxim Integrated Products 功能描述:MAIN POWER SUPPLY CONTROLLER FOR NOTEBOOK - Bulk
MAX1538ETI 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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