- 您现在的位置：买卖IC网 > PDF目录258068 > DCR012405U/1K (TEXAS INSTRUMENTS INC) 1-OUTPUT 1 W DC-DC REG PWR SUPPLY MODULE PDF资料下载
参数资料
| 型号： | DCR012405U/1K |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 1 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PLASTIC, SOP-28/12 |
| 文件页数： | 2/17页 |
| 文件大小： | 304K |
| 代理商： | DCR012405U/1K |
DCR01 Series
10
SBVS013C
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCR01 series offers isolation from an unregulated
power supply operating from a choice of input voltages. The
DCR01s provide a variety of regulated output voltages at a
nominal output power of 1W or above.
POWER STAGE
The input supply is chopped at a frequency of 400kHz
(internal oscillator divided by 2), which is used to drive the
center-tapped toroidal transformer.
RECTIFICATION
The transformer’s output is full wave rectified and smoothed
by the external capacitor connected to VREC.
REGULATOR
The internal low drop-out regulator provides a well-regu-
lated output voltage, throughout the operating range of the
device.
OSCILLATOR AND WATCHDOG
The DCR01 uses an internal saw-tooth generator to provide
the 800kHz on-board oscillator that is used to drive the
power switching circuit. The operation of the oscillator is
monitored by the watchdog, which will tri-state the output
driver circuit if the oscillator fails, or if the SYNC pin is
taken LOW, (shutdown mode). When the SYNC pin is
returned HIGH, normal operation resumes.
SYNCHRONIZATION
If more than one DCR01 is being used, beat frequencies and
other electrical interference can be generated. This is due to
the small variations in switching frequencies between the
converters.
The DCR01 overcomes this by allowing devices to be
synchronized to one another. Up to eight devices can be
synchronized by connecting the SYNC pins together, with
care being taken to minimize the capacitance of tracking.
Significant stray capacitance on the SYNC pin will have the
effect of reducing the frequency of the internal oscillator. If
this is large, the DCR01 may be taken outside its optimized
operating parameters, and saturation of the magnetics may
result, damaging the device.
If devices are synchronized, it should be noted that all devices
will draw maximum current simultaneously at start up. This
can cause the input voltage to dip. Should it fall below the
minimum input voltage, the devices may not start up. A 2.2
F
capacitor (low ESR) should be connected as close to the
device input pins as possible for the 5V input devices, and a
0.47
F capacitor for the 12V and 24V devices.
If more than eight devices are required to be synchronized, it
is recommended that external synchronization be used. Details
are contained in Texas Instruments Application Report
literature number SBAA035 (AB-153) available at www.ti.com.
CONSTRUCTION
The DCR01 is manufactured using the same technology as
standard IC packages. There is no substrate within the
package. The DCR01 is constructed using a driver IC, low-
dropout voltage regulator, rectifier diodes, and a wound
magnetic toroid, all mounted on a leadframe. The DCR01
requires no special PCB assembly processing, as there is no
solder within the package. The result is an isolated DC/DC
converter with inherently high reliability.
ADDITIONAL FUNCTIONS
DISABLE/ENABLE
The DCR01 can be disabled or enabled by driving the SYNC
pin using an open drain CMOS gate. If the SYNC pin is
pulled LOW, the DCR01 will be disabled. The disable time
depends upon the external loading. The internal disable
function is implemented in 2
s. Removal of the pull down
will enable the DCR01.
Capacitance loading on the SYNC pin should be minimized
in order to prevent a reduction in the internal oscillator‘s
frequency. See Application Report (SBAA035) “External
Synchronization of the DCP01/02 Series of DC/DC Con-
verters”. This document contains information on how to null
the effects of additional capacitance on the SYNC pin. The
oscillator’s frequency can be measured at VREC, as this is the
fundamental frequency of the ripple component.
OUTPUT ENABLE/DISABLE
The regulated output of the DCR01 can be disabled by pulling
the ENABLE pin LOW (connect ENABLE to 0VOUT). Hold-
ing the ENABLE pin HIGH (connect ENABLE to VREC)
enables the regulated output voltage, thus allowing the output
to be controlled from the isolated side, see Figure 1.
DCR
01
V
OUT
V
IN
C
IN
NOTE: (1) 2.2
F capacitor with low ESR for 5V
devices and 0.47
F for 12V and 24V devices.
C
OUT = 0.1F
R
ERR = 10k
R
EN = 10k
C
FILTER = 1F
V
O1
0V
OUT
0V
ENABLE
V
REC
ERROR
V
S
U1
0V
SYNC
ERROR
SW1
see text
FIGURE 1. DCR01 with a Single Output.
相关PDF资料 |
PDF描述 |
|---|---|
| DHC2805S | 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| DM1501-9RD5AFU | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| DM1601-7RD6AFU | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| DM1901-7RD5AFU | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| DM3020-9PD7AFU | 3-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DCR012405UE4 | 功能描述:DC/DC转换器 Mini 1W Iso Reg DC/DC转换器 RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| DCR015 | 制造商:Dewalt 功能描述:Worksite Charger Radio 制造商:DEWALT 功能描述:JOBSITE RADIO CHARGER 12V/20V MAX |
| DCR01505 | 制造商:BB 制造商全称:BB 功能描述:Miniature, 1W Isolated REGULATED DC/DC CONVERTERS |
| DCR019JBE400 | 制造商:JAE 制造商全称:JAE 功能描述:HDMI Standard Digital Interface Connector |
| DCR019WBE400 | 制造商:JAE 制造商全称:JAE 功能描述:HDMI Standard Digital Interface Connector |
发布紧急采购，3分钟左右您将得到回复。