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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： | 3/17页 |
| 文件大小： | 304K |
| 代理商： | DCR012405U/1K |
DCR01 Series
11
SBVS013C
ERROR FLAG
The DCR01 has an ERROR pin which provides a “power
good” flag, as long as the internal regulator is in regulation.
DECOUPLING
Ripple Reduction
Due to the very low forward resistance of the DMOS
switching transistors, high current demands are placed upon
the input supply for a short time. By using a good quality
low Equivalent Series Resistance (ESR) capacitor of 2.2
F
(minimum) for the 5V input devices and a 0.47
F capacitor
for the 12V and 24V devices, placed close to the IC supply
input pins, the effects on the power supply can be mini-
mized.
The high switching frequency of 400kHz allows relatively
small values of capacitors to be used for filtering the recti-
fied output voltage. A good quality low ESR capacitor of
1
F placed close to the V
REC pin and output ground will
reduce the ripple.
It is not recommended that the DCR01 be fitted using an
IC socket as this will degrade performance.
The output at VREC is full wave rectified and produces a
ripple of 800kHz.
It is recommended that a 0.1
F low ESR capacitor is
connected close to the output pin and ground to reduce noise
on the output. The capacitor values listed are minimum
values. If lower ripple is required then the filter capacitor
should be increased in value to 2.2
F.
NOTE: As with all switching power supplies the best
performance is only obtained with low ESR capacitors
connected close to the switcher. If low ESR capacitors are
not used, the ESR will generate a voltage drop when the
capacitor is supplying the load power. Often a larger capaci-
tor is chosen for this purpose when a low ESR smaller
capacitance would perform as well.
APPLICATION NOTES
DCR01 SINGLE VOLTAGE OUTPUT
The DCR01 can be used to provide a single voltage output
by connecting, see Figure 1. The ERROR output signal will
be pulled up to the value of VOUT for the particular DCR01
being used. The value of RERR will depend on the loading on
the ERROR line however, the total load on the ERROR line
must not exceed the value given in the specification.
The output may be permanently enabled by connecting the
ENABLE pin to the VREC pin. The DCR01 may be enabled
remotely by connecting the ENABLE pin to VREC via a pull-
up resistor (REN ), the value of this resistor is not critical for
the DCR01 as only a small current flows. The switch SW1 can
be used to pull the ENABLE pin LOW, thus disabling the
output. The switching devices can be a bipolar transistor, FET
or a mechanical device, the main load that it will see is REN.
GENERATING TWO POSITIVE
OUTPUT VOLTAGES
Two DCR01s can be used to create output voltages of +3.3V
and +5V, as shown in Figure 2. The two DCR01s are
connected in self-synchronization, thus locking the oscilla-
tors of both devices to a single frequency.
The ERROR and ENABLE facilities may be used in a
similar configuration for a single DCR01. The filter capaci-
tors connected to the VREC pins (CFILTER), should be kept
separate from each other and connected in close proximity to
their respective DCR01. If similar output voltages are being
used, it is not recommended that a single filter capacitor
(with an increased capacitance) be used with both VREC pins
connected together, as this could result is the overloading of
one of the devices.
DCR
01
V
OUT
V
IN
C
IN
(1)
C
OUT = 0.1F
R
ERR = 10k
C
FILTER = 1F
V
O1
0V
ENABLE
V
REC
ERROR
V
S
U1
0V
SYNC
ERROR
DCR
01
V
OUT
V
IN
C
IN
(1)
C
OUT = 0.1F
R
ERR = 10k
C
FILTER = 1F
V
O2
0V
ENABLE
V
REC
ERROR
V
S
U2
0V
SYNC
0V
OUT
ERROR
NOTE: (1) 2.2
F capacitor with low ESR for 5V
devices and 0.47
F for 12V and 24V devices.
FIGURE 2. Generating Two Positive Voltages from Self-Synchronized DCR01s.
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