- 您现在的位置：买卖IC网 > PDF目录16702 > MAX1533AETJ+T (Maxim Integrated Products)IC POWER SUPPLY CONTROLER 32TQFN PDF资料下载
参数资料
| 型号： | MAX1533AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 28/38页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY CONTROLER 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 26 V |
| 电流 - 电源： | 15µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页当前第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
? 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 cur-
rent (I LOAD ) determines the thermal stresses and
look for nonstandard values, which can provide a better
compromise in LIR across the input voltage range. If
using a swinging inductor (where the no-load induc-
tance decreases linearly with increasing current), evalu-
ate the LIR with properly scaled inductance values. For
the selected inductance value, the actual peak-to-peak
inductor ripple current ( Δ I INDUCTOR ) is defined by:
V OUT ( V IN OUT )
thus drives the selection of input capacitors,
MOSFETs, and other critical heat-contributing com-
ponents.
? Switching Frequency. This choice determines the
Δ I INDUCTOR =
- V
V IN f OSC L
basic trade-off between size and efficiency. The opti-
mal frequency is largely a function of maximum input
voltage, due to MOSFET switching losses that are
proportional to frequency and V IN 2 . The optimum fre-
quency is also a moving target, due to rapid improve-
Ferrite cores are often the best choice, although pow-
dered iron is inexpensive and can work well at 200kHz.
The core must be large enough not to saturate at the
peak inductor current (I PEAK ):
ments in MOSFET technology that are making higher
frequencies more practical.
? Inductor Operating Point. This choice provides
I PEAK = I LOAD ( MAX ) +
Δ I INDUCTOR
2
trade-offs between size vs. efficiency and transient
response vs. output ripple. Low inductor values pro-
vide better transient response and smaller physical
size, but also result in lower efficiency and higher
output ripple due to increased ripple currents. The
minimum practical inductor value is one that causes
the circuit to operate at the edge of critical conduc-
tion (where the inductor current just touches zero
with every cycle at maximum load). Inductor values
lower than this grant no further size-reduction bene-
fit. 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.
Inductor Selection
The switching frequency and inductor operating point
determine the inductor value as follows:
Transformer Design
(For the MAX1537A Auxiliary Output)
A coupled inductor or transformer can be substituted
for the inductor in the 5V SMPS to create an auxiliary
output (Figure 1). The MAX1537A is particularly well
suited for such applications because the secondary
feedback threshold automatically triggers DL5 even if
the 5V output is lightly loaded.
The power requirements of the auxiliary supply must be
considered in the design of the main output. The trans-
former must be designed to deliver the required current
in both the primary and the secondary outputs with the
proper turns ratio and inductance. The power ratings of
the synchronous-rectifier MOSFETs and the current limit
in the MAX1537A must also be adjusted accordingly.
Extremes of low input-output differentials, widely different
output loading levels, and high turns ratios can further
complicate the design due to parasitic transformer para-
L =
V OUT ( V IN - V OUT )
V IN f OSC I LOAD(MAX) LIR
meters such as interwinding capacitance, secondary
resistance, and leakage inductance. Power from the
main and secondary outputs is combined to get an
equivalent current referred to the main output. Use this
For example: I LOAD(MAX) = 5A, V IN = 12V, V OUT = 5V,
f OSC = 300kHz, 30% ripple current or LIR = 0.3.
total current to determine the current limit (see the
Setting the Current Limit section):
5 V × ( )
L =
12 V - 5V
12V × 300kHz × 5 A × 0 . 3
= 6 . 50 μ H
I LOAD(MAX) = P TOTAL / V OUT5
where P TOTAL is the sum of the main and secondary
outputs and I LOAD(MAX) is the maximum output current
used to determine the primary inductance (see the
Find a low-loss inductor with the lowest possible DC
resistance that fits in the allotted dimensions. Most
inductor manufacturers provide inductors in standard
values, such as 1.0μH, 1.5μH, 2.2μH, 3.3μH, etc. Also
Inductor Selection section).
28
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| REC5-2409DRW/H6/C | CONV DC/DC 5W 18-36VIN +/-09VOUT |
| V375C36T75BL3 | CONVERTER MOD DC/DC 36V 75W |
| RBM24DSXS | CONN EDGECARD 48POS DIP .156 SLD |
| GBM18DRST | CONN EDGECARD 36POS DIP .156 SLD |
| V72C15E150BL3 | CONVERTER MOD DC/DC 15V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1533ETJ | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1533ETJ+ | 功能描述:电流和电力监控器、调节器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1533ETJ+T | 功能描述:电流和电力监控器、调节器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1533ETJ-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1533EVKIT | 功能描述:电流和电力监控器、调节器 Evaluation Kit for the MAX1533 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。