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參數(shù)資料
| 型號(hào)： | TLE7469 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual Low Drop Voltage Regulator |
| 中文描述： | 雙低壓降穩(wěn)壓器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 240K |
| 代理商： | TLE7469 |
Final Data Sheet
12
Rev. 1.3, 2004-10-28
TLE 7469
Application Information
AEA03529_2.VSD
TLE 7469
Q2
DT
WDI
RO
SO
Q1
XC 164
1 μF
47
μF
10 k
1 μF
47
μF
100 nF
R
Vi
*
100 k
I2
INH
SI
100 nF
V
Bat
47
μF
e. g.
Ignition
Key
I1
GND
= Optional
Figure 3
Application Diagram with Typical External Components
A typical application of the TLE 7469 is shown in
Figure 3
. To prevent the regulation
loop from oscillating a ceramic capacitor of
C
Q1/2
≥
1
μ
F is required at each of the outputs
Q1 and Q2. In contrast to most low drop voltage regulators the TLE 7469 only needs
moderate capacitance at the outputs and tolerates ceramic capacitors to keep the
stability. This offers more design flexibility to the circuit designer enabling also to operate
the device without tantalum capacitors.
Additional a capacitor C
B
of 10 … 47
μ
F should be used for each output Q1 and Q2 to
suppress influences from load surges to the voltage levels. This one can either be an
aluminum electrolytic capacitor or a tantalum capacitor following the application
requirements.
General recommendation at Tj<90°C is to keep the drop over the equivalent serial
resistor (ESR) together with the discharge of the blocking capacitor below 300mV.
Since the regulator output current roughly rises linearly with time the discharge of the
capacitor can be calculated as:
dVC
B
= dI
Q
*dt/C
B
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