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參數(shù)資料
| 型號： | TCL1585 |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| 中文描述： | 第7A / 5A條/ 4.6a進(jìn)入/ 3A條，響應(yīng)速度快，低壓降線性穩(wěn)壓器陽性 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 144K |
| 代理商： | TCL1585 |
7
TCL1584
TCL1585
TCL1587
PRELIMINARY INFORMATION
7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
TCL1584/1585/1587-04 6/6/97
Output Voltage
The output voltage for the fixed output versions of the
TCL158x is set internally and cannot be adjusted. For the
adjustable output versions, the output voltage is set by two
external resistors: R1 and R2 (see Figure 3). A 1.25V
reference voltage is maintained between the OUTPUT pin
and the ADJ pin. NOTE: the ADJ pin typically will source
55
μ
A. R1 should be chosen to conduct at least the specified
minimum load current of 10mA (i.e. at most 125
). Now R2
will determine the total output voltage according to the
equation below:
V
OUT
= V
REF
(1+ R2/R1) + R2(I
ADJ
)
The contribution due to the I
ADJ
term is relatively small
as I
ADJ
is only 55
μ
A compared to 10mA for the total current
in the adjust circuit.
Figure 4. Adjustable Voltage Regulator
In both cases, because the effect of parasitic trace
resistance (R
P
) cannot be completely eliminated, it is impor-
tant to keep the positive output lead as short as possible.
Otherwise, at high output currents, the load regulation will
degrade appreciably. Example:
R
P
= 5m
I
OUT
= 3A
V
DROP
= (0.005) x (3) = 15mV
V
OUT
V
REF
C2
22
μ
F
I
ADJ
55
μ
A
R2
R1
OUT
IN
TCL1584
ADJ
V
IN
V
OUT
= V
REF
(
1+ R2
)
+ I
ADJ
(R2)
R1
+
C1
10
μ
F
Load Regulation
Because the TCL158x family are three terminal de-
vices, it is not possible to perform true Kelvin load voltage
sensing. Therefore load regulation is limited somewhat by
parasitic trace resistance. The load regulation specifications
are measured directlyat the TCL158x package. To minimize
degradation in load regulation performance the following
guidelines should be used.
For fixed voltage devices, the GND pin should be
connected directly to the negative side of the load instead of
to a common ground bus. This provides Kelvin sensing at
the negative side while the positive side is still limited by R
P
(See Figure 5).
For adjustable output devices, the bottom of R2 con-
nects to the negative side of the load. For the positive side,
best regulation is obtained when the top of R1 is connected
directly to the TCL158x and not to the load (See Figure 6).
If R1 connects to the load the effective resistance between
the output and the load is:
R
P
x (1 + R2/R1)
Figure 5. Connection for Best Load Regulation
Figure 6. Connection for Best Load Regulation
R
L
OUT
IN
TCL1584-3.3
GND
RP
PARASITIC
LINE RESISTANCE
V
IN
R
L
OUT
IN
TCL1584
ADJ
RP
PARASITIC
LINE RESISTANCE
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
V
IN
R1*
R2*
Thermal Considerations
The TCL158x family includes built-in thermal overload
protection. However, maximum operating junction tempera-
ture must not be exceededfor any condition. Since these
devices are capable of dissipating up to 25W or more under
some conditions, careful thermal design is required for
reliable, continuous operation. In most cases, external heat
sinking will be required.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TCL1585-3.3CAB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1585-3.3CEB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587 | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587-3.3CAB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
| TCL1587-3.3CEB | 7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS |
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