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| 型号： | PT3402 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | "2.5V 12A |
| 中文描述： | 2.5V 12A 输出 48V 输入的隔离 DC/DC 转换器 |
| 文件页数： | 10/13页 |
| 文件大小： | 284K |
| 代理商： | PT3402 |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Power-Up Sequencing Feature of the
PT3400 Series of DC/DC Converters
Introduction
Power-up sequencing is a term used to describe the
order and timing that supply voltages power up in a
multi-voltage power supply system. Multi-voltage power
supply architectures are a common place requirement in
electronic circuits that employ high-performance mi-
croprocessors or digital signal processors (DSPs). These
circuits require a tightly regulated low-voltage supply
for the processor core, and a higher voltage to power
the processor’s system interface or I/O circuitry. Power-
up sequencing is often required between two such voltages
in order to manage the voltage differential during the brief
period of power-up. This reduces stress and improves the
long term reliability of the dual-voltage devices and their
associated circuitry. The most popular solution is termed
“Simultaneous Startup,” whereby the two affected voltages
both start at the same time and then rise at the same rate.
Configuration for Power-up Sequencing
The PT3400 series converters have a feature that allows
individual modules to be easily configured for simulta-
neous startup. Using the
SEQ
control (pin 5), two PT3400
modules are simply interconnected with just a few passive
components. This eliminates much of the application
circuitry that would otherwise be required for this type of
setup. The schematic is given in Figure 4-1. The setup is
relatively simple but varies slightly with the combination
of output voltages being sequenced. Capacitor C
3
(5)
is only
required when the modules selected are a mix between
a high-voltage module (3.3V through 1.8V), and a low-
voltage module (
≤
1.5V). For all other configurations
C
3
is replaced by a wire link. For clarification Table 4-1
indicates which modules are a high voltage type (Type A),
and which are a low voltage type (Type B). Table 4-2
provides guidance as to the one combination that requires
the capacitor C
3
. Examples of waveforms obtained from a
sequenced start-up between two PT3400 series modules
are provided in Figure 4-2, Figure 4-3, and Figure 4-4.
In each case the voltage difference during the synchronized
portion of the power up sequence is typically within 0.4V.
Both the timing and tracking of output voltages during
the power-up sequence will vary slightly with input voltage,
temperature, and with differences in the output capaci-
tance and load current between the two converter modules.
This power-up sequencing solution may not be suitable
for every application. To ensure compatibility the appli-
cation should be tested against all variances. For additional
support please contact a Plug-in Power applications
specialist.
PT3400 Series
Table 4-1; PT3400 Module Type Identification
PART No.
PT3401
PT3402
PT3403
PT3404
PT3405
PT3406
PT3407
VOUT
(3.3V)
(2.5V)
(1.8V)
(1.5V)
(1.4V)
(1.2V)
(1.0V)
TYPE A
×
×
×
TYPE B
×
×
×
×
Table 4-2; Value of C
3
in Sequencing Setup
MODULE #1 MODULE #2
A
B
A
C
3
COMMENTS
Waveforms given in Figure 4-2
Waveforms given in Figure 4-3
Waveforms given in Figure 4-4
A
B
B
Wire link
Wire link
0.1μF
(5)
Notes
1. The two converters configured for sequenced power up
must be located close together on the same printed circuit
board.
2. When configured for power-up sequencing, a minimum
of 1,000μF output capacitance is recommended at the
output of each converter.
3. The best results are obtained if a load of 1A or greater is
present at both converter outputs.
4. The capacitors, C
1
and C
2
, should each be placed close to
their associated converter, Module #1, and Module #2
respectively. Combining C
1
and C
2
to a single capacitor of
equivalent value is not recommended.
5. The capacitor C
3
is only required whenever a Type A and
Type B converter are connected together for sequenced
power-up. In this event C
3
should always be connected to
the
SEQ
control (pin 5) of the Type B module, or the
converter with the lowest output voltage. For all other
converter configurations C
3
is not required, and is
replaced by a copper trace or wire link.
6. The capacitors selected for C
1
, C
2
, & C
3
should be of
good quality and have stable characteristics. Capacitors
with an X7R dielectric, and 5% tolerance are
recommended.
7. The enable controls, EN1 & EN2, are optional for a
sequenced pair of converters. If an enable signal is desired,
EN1 or EN2 of both converters units must be controlled
from a single transistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PT3402A | 功能描述:直流/直流开关转换器 2.5V 12A 48-V Input Iso DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| PT3402C | 功能描述:直流/直流开关转换器 2.5V 12A 48-V Input Iso DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| PT3402N | 功能描述:直流/直流开关转换器 2.5V 12A 48-V Input Iso DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| PT3403 | 制造商:TI 制造商全称:Texas Instruments 功能描述:35-W 48-V Input Isolated DC/DC Converter |
| PT3403A | 功能描述:直流/直流开关转换器 1.8V 12A 48-V Input Iso DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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