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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 27/38頁 |
| 文件大?。?/td> | 1427K |
| 代理商： | MAX1537A |
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M
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
______________________________________________________________________________________
27
Thermal Fault Protection
The MAX1533A/MAX1537A feature a thermal fault-pro-
tection circuit. When the junction temperature rises
above +160
°
C, a thermal sensor activates the fault
latch, pulls PGOOD low, and shuts down both SMPS
controllers using discharge mode (see the
Output
Discharge (Soft-Shutdown)
section). When an SMPS
output voltage drops to 0.3V, its synchronous rectifier
turns on, clamping the discharged output to GND.
Cycle V
CC
below 1V or toggle either ON3, ON5, or
SHDN
to clear the fault latch and restart the controllers
after the junction temperature cools by 15
°
C.
Auxiliary LDO Detailed
Description (MAX1537A Only)
The MAX1537A includes an auxiliary linear regulator
that delivers up to 150mA of load current. The output
(LDOA) can be preset to 12V, ideal for PCMCIA power
requirements, and for biasing the gates of load switch-
es in a portable device. In adjustable mode, LDOA can
be set to anywhere from 5V to 23V. The auxiliary regu-
lator has an independent ON/OFF control, allowing it to
be shut down when not needed, reducing power con-
sumption when the system is in a low-power state.
A flyback-winding control loop regulates a secondary
winding output, improving cross-regulation when the pri-
mary output is lightly loaded or when there is a low
input-output differential voltage. If V
INA
- V
LDOA
falls
below 0.8V, the low-side switch is turned on for a time
equal to 33% of the switching period. This reverses the
inductor (primary) current, pulling current from the out-
put filter capacitor and causing the flyback transformer
to operate in forward mode. The low impedance pre-
sented by the transformer secondary in forward mode
dumps current into the secondary output, charging up
the secondary capacitor and bringing V
INA
- V
LDOA
back into regulation. The secondary feedback loop does
not improve secondary output accuracy in normal fly-
back mode, where the main (primary) output is heavily
loaded. In this condition, secondary output accuracy is
determined by the secondary rectifier drop, transformer
turns ratio, and accuracy of the main output voltage.
Adjustable LDOA Voltage
(Dual-Mode Feedback)
Connect ADJA to GND to enable the fixed, preset 12V
auxiliary output. Connect a resistive voltage-divider at
ADJA between LDOA and GND to adjust the respective
output voltage between 5V and 23V (Figure 8). Choose
R2 (resistance from ADJA to GND) to be approximately
100k
Ω
and solve for R1 (resistance from LDOA to
ADJA) using the following equation:
where V
ADJA
= 2V nominal.
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 connectors, fuses, and battery-selector
switches. If there is a choice at all, lower input volt-
ages result in better efficiency.
R
R
V
V
LDOA
ADJA
1
2
1
=
-
Figure 8. Linear-Regulator Functional Diagram
FIXED 12V
INA
ADJA
LDOA
ONA
0.15V
SECONDARY
FEEDBACK
REF (2.0V)
5R
R
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相關代理商/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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