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參數(shù)資料
| 型號： | UC1-2 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3A Fixed Low Dropout Linear Regulator (LDO) |
| 中文描述： | 3A固定低壓差線性穩(wěn)壓器（LDO） |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 184K |
| 代理商： | UC1-2 |
4
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
1.6
1.7
1.8
1.9
0
1
2
3
I
L
(A)
V
D
Figure 1. Typical Dropout (V
B
- V
OUT
), T
J
= 27°C
100
200
300
400
I
L
V
D
(
100mA
1A
2A
3A
Figure 2. Typical Dropout (V
IN
- V
OUT
), T
J
= 27°C
PIN DESCRIPTIONS
ADJ:
In the adjustable version, the user programs the
output voltage with two external resistors. The resistors
should be 0.1% for high accuracy. The output amplifier is
configured as a non-inverting operational amplifier. The
resistors should meet the criteria of R3 || R4 < 100
.
Connect ADJ to VOUT for an output voltage of 1.2V. Note
that the point at which the feedback network is
connected to the output is the Kelvin sense point.
GND:
For accurate results, the GND pin should be
referenced to the load ground.
VB:
Supplies power to all circuits of the regulator except
the collector of the output power transistor. The 2V
headroom from VB to VOUT allows the use of a
Darlington
output
stage
for
inherently
low
output
impedance and fast response. (Dropout is derated for
junction temperatures below 0°C.)
VIN:
Supplies the current to the collector of the output
power transistor only. The dropout (VIN-VOUT) is under
100mV for light loads; maximum dropout is 450mV at 3A
for T
J
= 0°C to +110°C. (Dropout is derated for junction
temperatures over 110°C.) At full load, the majority of the
VB current is going to the load.
VOUT:
This pin should be connected to the load via a
low impedance path. Avoid connectors which add
significant inductance and resistance. Note that even
though a Kelvin sense is available through a 5 pin
package, care must be taken since voltage drops along
wire traces add to the dropout voltage.
The UC382 is easy to use. The adjustable version re-
quires two 0.1% resistors to set the output voltage. The
fixed versions of the UC382 require no external resistors.
All versions of the UC382 require decoupling capacitors
on the input and output. In a typical application, VB and
VIN are driven from switching power supplies which may
have large filter capacitors at their outputs. If the UC382
is further than 12 inches from the power supply, it is rec-
ommended to add local decoupling as close as possible
to the linear regulator.
Decouple the output of the UC382 with at least 100
μ
F of
high quality tantalum or Sanyo OSCON capacitors close
to the VOUT pin for maximum stability. Many applications
involving ultra fast GTL or BTL applications require addi-
tional capacitance close to the load. The exact amount
will vary according to speed and magnitude of the load
transients and the tolerance allowed for transients on
VOUT. When specifying the decoupling capacitors, the
series resistance of the capacitor bank is an important
factor in its ability to filter load transients.
The UC382 allows for Kelvin sensing the voltage at the
load. This improves regulation performance and elimi-
nates the voltage drops due to wire trace resistance. This
voltage drop must be added to the headroom (VIN to
VOUT and VB to VOUT). The dropout of 450mV is mea-
sured at the pins and does not include additional drops
due to trace resistance. The minimum load current is
10mA.
Two or more UC382’s may be used in parallel. While sta-
ble, this arrangement does degrade the transient re-
sponse.
APPLICATION INFORMATION
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