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参数资料
| 型号： | AS2732U-5.0 |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PSFM3 |
| 封装： | TO-220, 5 PIN |
| 文件页数： | 4/8页 |
| 文件大小： | 148K |
| 代理商： | AS2732U-5.0 |
Rev. 10/17/00
AS2730/31/32/33
APPLICATION HINTS
The AS2730/31/32/33 incorporates protection against over-
current faults, reversed load insertion, over temperature
operation, and positive and negative transient voltage.
However, the use of an output capacitor is required in order to
insure the stability and the performances.
Thermal Consideration
Although the AS2730/31/32/33 offers limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. The
case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.
Assuming:
VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50
°C/W,
θHeatsink Case= 6°C/W, θHeatsink Case = 0.5°C/W, θ JC = 3°C/W
Power dissipation under this condition
PD = (VIN – VOUT) * IOUT = 7.5W
Junction Temperature
TJ = TA + PD * (
θCase – HS + θ HS θ JC)
For the Control Section
TJ = 50 + 7.5*(0.5 + 6=3) = 121.25
°C
121.25
°C < TJ (max) for the Control & Power Sections.
In both case reliable operation is insured by adequate junction
temperature.
Capacitor Requirements
The output capacitor is needed for stability and to minimize
the output noise. The required value of the capacitor varies
with the load. However, a minimum value of 10
F Aluminum
will guarantee stability over load. A tantalum capacitor is
recommended for a fast load transient response
If the power source has high AC impedance, a 0.1
F capacitor
between input & ground is recommended. This capacitor
should have good characteristics up to 250 kHz.
Minimum Load Current
To ensure a proper behavior of the regulator at light load, a
minimum load of 10mA for AS2730/31/32/33 is required.
Adjustable Regulator Design
AS2730/31are adjustable regulators and maybe programmed
for any value between 1.25V and 16V using two resistors.
The relation between the resistors is given by:
R1=R2 (VOUT/1.240 –1)
Resistors have a large value up to 1m
in order to reduce the
current consumption. This might be interesting in the case of
widely varying load currents.
Error Flag
AS2731/33 features an error indicating either an over current
fault or a low input voltage. This flag pulls low when such a
problem occurs and may sink 10mA. It is inoperative during
thermal shutdown.
Enable Input
AS2731/32 features enable input allowing turning ON & OFF
the device. EN has been designed to be compatible with
TTL/CMOS logic. When the regulator is ON, the current
flowing through this pin is approximately 20
A.
AS2730
Fig.1 Basic Fixed Output Regulator
VOUT
V
IN
AS2732/33
Fig. 2 Adjustable Output Voltage Regulator
VOUT
V
IN
1
2
3
4
5
R
2
R
1
For best results, the total series resistance should be
small enough to pass the minimum regulator load current
V
OUT = VREF X [ 1 + (R1/R2) ]
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