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參數(shù)資料
| 型號(hào)： | TCL1117-3.30CEB |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V |
| 中文描述： | 800mA的低壓差型可調(diào)和固定工作在2.85V，3.30V，5.00V陽性調(diào)節(jié)器 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 121K |
| 代理商： | TCL1117-3.30CEB |
3
PRELIMINARY INFORMATION
TCL1117-05 6/5/97
800mA LOW DROPOUT POSITIVE REGULATORS
ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V
TCL1117
TCL1117-2.85
TCL1117-3.30
TCL1117-5.00
APPLICATIONS
Overload Protection
The TCL1117 is protected against current (short-circuit)
and thermal overload conditions. Thermal protection is
triggered by a chip temperature exceeding 165
°
C. Current
overload is triggered at approximately 950mA.
Stability and Load Regulation
The TCL1117 requires a capacitor from V
OUT
to GND to
provide compensation feedback to the internal gain stage.
This is to ensure stability at the output terminal. Typically, a
10
μ
F tantalum or 50
μ
F aluminum electrolytic is sufficient.
NOTE: It is important that the ESR for this capacitor does not
exceed 0.5
.
The output capacitor does not have a theoretical upper
limit and increasing its value will increase stability.
C
OUT
= 100
μ
F or more is typical for high current regulator
designs. NOTE: See Protection Diodes for limitations. An-
other benefit of larger output capacitance is improved tran-
sient load response (large di/dt in the load).
Protection Diodes
Typically no protection diodes are necessary for the
TCL1117. Unlike older regulators, the ADJ pin is protected
internally from excessive currents. The ADJ pin can be
driven with voltage transients as high as
±
25V with respect
to the output without damage to the device.
Likewise, a diode between the input and output is not
typically required. If the input voltage collapses the internal
circuitry can absorb ~20A transient currents (<10
μ
sec)
without damage. This reverse current is much larger than
most power supply designs can generate. However, if the
output capacitor is VERY large (>1000
μ
F), instantaneous
currents can be high enough to damage the chip. In this
case, a high-current, fast-response diode is recommended.
(See Figure 1).
Output Voltage Adjust
Like most LDOs, the TCL1117 regulates the output by
comparing the output voltage, or a multiple thereof, to an
internally generated reference voltage. On the adjustable
version, the V
REF
is available externally as 1.25V (
±
1%)
between V
OUT
and ADJ (See Figure 2). The voltage divider
formed by R1 and R2 should be set to conduct 10mA
(minimum output load). The output voltage is given by the
following equation:
V
OUT
= V
REF
1+ R2
)
+ I
ADJ
R2
R1
On fixed voltage versions of the TCL1117, the voltage
divider is provided internally.
Load Regulation
The TCL1117 load regulation is limited by the resistance
of the wire connecting it to the load (R
p
, Figure 3). For the
adjustable version, the best load regulation is accomplished
when the top of the resistor divider (R1) is connected directly
to the output pin of the TCL1117, NOT to the high side of the
load (Figure 3). When so connected, R
p
is not multiplied by
the divider ratio. For the fixed output versions, the top of R1
is internally connected to the output and the ground pin can
be connected to the low side of the load as a negative side
sense if, so desired.
Figure 1.
Figure 2. Basic Adjustable Regulator
+
+
VOUT
CADJ
10
μ
F
COUT
150
μ
F
R2
R1
OUT
IN
TCL1117
ADJ
D1
1N4002
(OPTIONAL)
VIN
VOUT
VREF
IADJ
50
μ
A
R2
VOUT = VREF
(
1+ R2
)
+ IADJ R2
R1
R1
OUT
IN
TCL1117
ADJ
VIN
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